diff options
Diffstat (limited to 'mesalib/src/mesa/swrast/s_triangle.c')
| -rw-r--r-- | mesalib/src/mesa/swrast/s_triangle.c | 2284 |
1 files changed, 1142 insertions, 1142 deletions
diff --git a/mesalib/src/mesa/swrast/s_triangle.c b/mesalib/src/mesa/swrast/s_triangle.c index d1b369bcd..93826b7ce 100644 --- a/mesalib/src/mesa/swrast/s_triangle.c +++ b/mesalib/src/mesa/swrast/s_triangle.c @@ -1,1142 +1,1142 @@ -/* - * Mesa 3-D graphics library - * Version: 7.3 - * - * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the "Software"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included - * in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS - * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN - * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - */ - - -/* - * When the device driver doesn't implement triangle rasterization it - * can hook in _swrast_Triangle, which eventually calls one of these - * functions to draw triangles. - */ - -#include "main/glheader.h" -#include "main/context.h" -#include "main/colormac.h" -#include "main/imports.h" -#include "main/macros.h" -#include "main/texformat.h" -#include "program/prog_instruction.h" - -#include "s_aatriangle.h" -#include "s_context.h" -#include "s_feedback.h" -#include "s_span.h" -#include "s_triangle.h" - - -/** - * Test if a triangle should be culled. Used for feedback and selection mode. - * \return GL_TRUE if the triangle is to be culled, GL_FALSE otherwise. - */ -GLboolean -_swrast_culltriangle( GLcontext *ctx, - const SWvertex *v0, - const SWvertex *v1, - const SWvertex *v2 ) -{ - SWcontext *swrast = SWRAST_CONTEXT(ctx); - GLfloat ex = v1->attrib[FRAG_ATTRIB_WPOS][0] - v0->attrib[FRAG_ATTRIB_WPOS][0]; - GLfloat ey = v1->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][1]; - GLfloat fx = v2->attrib[FRAG_ATTRIB_WPOS][0] - v0->attrib[FRAG_ATTRIB_WPOS][0]; - GLfloat fy = v2->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][1]; - GLfloat c = ex*fy-ey*fx; - - if (c * swrast->_BackfaceSign * swrast->_BackfaceCullSign <= 0.0F) - return GL_FALSE; - - return GL_TRUE; -} - - - -/* - * Render a flat-shaded RGBA triangle. - */ -#define NAME flat_rgba_triangle -#define INTERP_Z 1 -#define SETUP_CODE \ - ASSERT(ctx->Texture._EnabledCoordUnits == 0);\ - ASSERT(ctx->Light.ShadeModel==GL_FLAT); \ - span.interpMask |= SPAN_RGBA; \ - span.red = ChanToFixed(v2->color[0]); \ - span.green = ChanToFixed(v2->color[1]); \ - span.blue = ChanToFixed(v2->color[2]); \ - span.alpha = ChanToFixed(v2->color[3]); \ - span.redStep = 0; \ - span.greenStep = 0; \ - span.blueStep = 0; \ - span.alphaStep = 0; -#define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span); -#include "s_tritemp.h" - - - -/* - * Render a smooth-shaded RGBA triangle. - */ -#define NAME smooth_rgba_triangle -#define INTERP_Z 1 -#define INTERP_RGB 1 -#define INTERP_ALPHA 1 -#define SETUP_CODE \ - { \ - /* texturing must be off */ \ - ASSERT(ctx->Texture._EnabledCoordUnits == 0); \ - ASSERT(ctx->Light.ShadeModel==GL_SMOOTH); \ - } -#define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span); -#include "s_tritemp.h" - - - -/* - * Render an RGB, GL_DECAL, textured triangle. - * Interpolate S,T only w/out mipmapping or perspective correction. - * - * No fog. No depth testing. - */ -#define NAME simple_textured_triangle -#define INTERP_INT_TEX 1 -#define S_SCALE twidth -#define T_SCALE theight - -#define SETUP_CODE \ - struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; \ - const struct gl_texture_object *obj = \ - ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \ - const struct gl_texture_image *texImg = \ - obj->Image[0][obj->BaseLevel]; \ - const GLfloat twidth = (GLfloat) texImg->Width; \ - const GLfloat theight = (GLfloat) texImg->Height; \ - const GLint twidth_log2 = texImg->WidthLog2; \ - const GLubyte *texture = (const GLubyte *) texImg->Data; \ - const GLint smask = texImg->Width - 1; \ - const GLint tmask = texImg->Height - 1; \ - ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888); \ - if (!rb || !texture) { \ - return; \ - } - -#define RENDER_SPAN( span ) \ - GLuint i; \ - GLubyte rgb[MAX_WIDTH][3]; \ - span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \ - span.intTex[1] -= FIXED_HALF; \ - for (i = 0; i < span.end; i++) { \ - GLint s = FixedToInt(span.intTex[0]) & smask; \ - GLint t = FixedToInt(span.intTex[1]) & tmask; \ - GLint pos = (t << twidth_log2) + s; \ - pos = pos + pos + pos; /* multiply by 3 */ \ - rgb[i][RCOMP] = texture[pos+2]; \ - rgb[i][GCOMP] = texture[pos+1]; \ - rgb[i][BCOMP] = texture[pos+0]; \ - span.intTex[0] += span.intTexStep[0]; \ - span.intTex[1] += span.intTexStep[1]; \ - } \ - rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, NULL); - -#include "s_tritemp.h" - - - -/* - * Render an RGB, GL_DECAL, textured triangle. - * Interpolate S,T, GL_LESS depth test, w/out mipmapping or - * perspective correction. - * Depth buffer bits must be <= sizeof(DEFAULT_SOFTWARE_DEPTH_TYPE) - * - * No fog. - */ -#define NAME simple_z_textured_triangle -#define INTERP_Z 1 -#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE -#define INTERP_INT_TEX 1 -#define S_SCALE twidth -#define T_SCALE theight - -#define SETUP_CODE \ - struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; \ - const struct gl_texture_object *obj = \ - ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \ - const struct gl_texture_image *texImg = \ - obj->Image[0][obj->BaseLevel]; \ - const GLfloat twidth = (GLfloat) texImg->Width; \ - const GLfloat theight = (GLfloat) texImg->Height; \ - const GLint twidth_log2 = texImg->WidthLog2; \ - const GLubyte *texture = (const GLubyte *) texImg->Data; \ - const GLint smask = texImg->Width - 1; \ - const GLint tmask = texImg->Height - 1; \ - ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888); \ - if (!rb || !texture) { \ - return; \ - } - -#define RENDER_SPAN( span ) \ - GLuint i; \ - GLubyte rgb[MAX_WIDTH][3]; \ - span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \ - span.intTex[1] -= FIXED_HALF; \ - for (i = 0; i < span.end; i++) { \ - const GLuint z = FixedToDepth(span.z); \ - if (z < zRow[i]) { \ - GLint s = FixedToInt(span.intTex[0]) & smask; \ - GLint t = FixedToInt(span.intTex[1]) & tmask; \ - GLint pos = (t << twidth_log2) + s; \ - pos = pos + pos + pos; /* multiply by 3 */ \ - rgb[i][RCOMP] = texture[pos+2]; \ - rgb[i][GCOMP] = texture[pos+1]; \ - rgb[i][BCOMP] = texture[pos+0]; \ - zRow[i] = z; \ - span.array->mask[i] = 1; \ - } \ - else { \ - span.array->mask[i] = 0; \ - } \ - span.intTex[0] += span.intTexStep[0]; \ - span.intTex[1] += span.intTexStep[1]; \ - span.z += span.zStep; \ - } \ - rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, span.array->mask); - -#include "s_tritemp.h" - - -#if CHAN_TYPE != GL_FLOAT - -struct affine_info -{ - GLenum filter; - GLenum format; - GLenum envmode; - GLint smask, tmask; - GLint twidth_log2; - const GLchan *texture; - GLfixed er, eg, eb, ea; - GLint tbytesline, tsize; -}; - - -static INLINE GLint -ilerp(GLint t, GLint a, GLint b) -{ - return a + ((t * (b - a)) >> FIXED_SHIFT); -} - -static INLINE GLint -ilerp_2d(GLint ia, GLint ib, GLint v00, GLint v10, GLint v01, GLint v11) -{ - const GLint temp0 = ilerp(ia, v00, v10); - const GLint temp1 = ilerp(ia, v01, v11); - return ilerp(ib, temp0, temp1); -} - - -/* This function can handle GL_NEAREST or GL_LINEAR sampling of 2D RGB or RGBA - * textures with GL_REPLACE, GL_MODULATE, GL_BLEND, GL_DECAL or GL_ADD - * texture env modes. - */ -static INLINE void -affine_span(GLcontext *ctx, SWspan *span, - struct affine_info *info) -{ - GLchan sample[4]; /* the filtered texture sample */ - const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits; - - /* Instead of defining a function for each mode, a test is done - * between the outer and inner loops. This is to reduce code size - * and complexity. Observe that an optimizing compiler kills - * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST). - */ - -#define NEAREST_RGB \ - sample[RCOMP] = tex00[2]; \ - sample[GCOMP] = tex00[1]; \ - sample[BCOMP] = tex00[0]; \ - sample[ACOMP] = CHAN_MAX; - -#define LINEAR_RGB \ - sample[RCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\ - sample[GCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\ - sample[BCOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0]);\ - sample[ACOMP] = CHAN_MAX; - -#define NEAREST_RGBA \ - sample[RCOMP] = tex00[3]; \ - sample[GCOMP] = tex00[2]; \ - sample[BCOMP] = tex00[1]; \ - sample[ACOMP] = tex00[0]; - -#define LINEAR_RGBA \ - sample[RCOMP] = ilerp_2d(sf, tf, tex00[3], tex01[3], tex10[3], tex11[3]);\ - sample[GCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\ - sample[BCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\ - sample[ACOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0]) - -#define MODULATE \ - dest[RCOMP] = span->red * (sample[RCOMP] + 1u) >> (FIXED_SHIFT + 8); \ - dest[GCOMP] = span->green * (sample[GCOMP] + 1u) >> (FIXED_SHIFT + 8); \ - dest[BCOMP] = span->blue * (sample[BCOMP] + 1u) >> (FIXED_SHIFT + 8); \ - dest[ACOMP] = span->alpha * (sample[ACOMP] + 1u) >> (FIXED_SHIFT + 8) - -#define DECAL \ - dest[RCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->red + \ - ((sample[ACOMP] + 1) * sample[RCOMP] << FIXED_SHIFT)) \ - >> (FIXED_SHIFT + 8); \ - dest[GCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->green + \ - ((sample[ACOMP] + 1) * sample[GCOMP] << FIXED_SHIFT)) \ - >> (FIXED_SHIFT + 8); \ - dest[BCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->blue + \ - ((sample[ACOMP] + 1) * sample[BCOMP] << FIXED_SHIFT)) \ - >> (FIXED_SHIFT + 8); \ - dest[ACOMP] = FixedToInt(span->alpha) - -#define BLEND \ - dest[RCOMP] = ((CHAN_MAX - sample[RCOMP]) * span->red \ - + (sample[RCOMP] + 1) * info->er) >> (FIXED_SHIFT + 8); \ - dest[GCOMP] = ((CHAN_MAX - sample[GCOMP]) * span->green \ - + (sample[GCOMP] + 1) * info->eg) >> (FIXED_SHIFT + 8); \ - dest[BCOMP] = ((CHAN_MAX - sample[BCOMP]) * span->blue \ - + (sample[BCOMP] + 1) * info->eb) >> (FIXED_SHIFT + 8); \ - dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8) - -#define REPLACE COPY_CHAN4(dest, sample) - -#define ADD \ - { \ - GLint rSum = FixedToInt(span->red) + (GLint) sample[RCOMP]; \ - GLint gSum = FixedToInt(span->green) + (GLint) sample[GCOMP]; \ - GLint bSum = FixedToInt(span->blue) + (GLint) sample[BCOMP]; \ - dest[RCOMP] = MIN2(rSum, CHAN_MAX); \ - dest[GCOMP] = MIN2(gSum, CHAN_MAX); \ - dest[BCOMP] = MIN2(bSum, CHAN_MAX); \ - dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8); \ - } - -/* shortcuts */ - -#define NEAREST_RGB_REPLACE \ - NEAREST_RGB; \ - dest[0] = sample[0]; \ - dest[1] = sample[1]; \ - dest[2] = sample[2]; \ - dest[3] = FixedToInt(span->alpha); - -#define NEAREST_RGBA_REPLACE \ - dest[RCOMP] = tex00[3]; \ - dest[GCOMP] = tex00[2]; \ - dest[BCOMP] = tex00[1]; \ - dest[ACOMP] = tex00[0] - -#define SPAN_NEAREST(DO_TEX, COMPS) \ - for (i = 0; i < span->end; i++) { \ - /* Isn't it necessary to use FixedFloor below?? */ \ - GLint s = FixedToInt(span->intTex[0]) & info->smask; \ - GLint t = FixedToInt(span->intTex[1]) & info->tmask; \ - GLint pos = (t << info->twidth_log2) + s; \ - const GLchan *tex00 = info->texture + COMPS * pos; \ - DO_TEX; \ - span->red += span->redStep; \ - span->green += span->greenStep; \ - span->blue += span->blueStep; \ - span->alpha += span->alphaStep; \ - span->intTex[0] += span->intTexStep[0]; \ - span->intTex[1] += span->intTexStep[1]; \ - dest += 4; \ - } - -#define SPAN_LINEAR(DO_TEX, COMPS) \ - for (i = 0; i < span->end; i++) { \ - /* Isn't it necessary to use FixedFloor below?? */ \ - const GLint s = FixedToInt(span->intTex[0]) & info->smask; \ - const GLint t = FixedToInt(span->intTex[1]) & info->tmask; \ - const GLfixed sf = span->intTex[0] & FIXED_FRAC_MASK; \ - const GLfixed tf = span->intTex[1] & FIXED_FRAC_MASK; \ - const GLint pos = (t << info->twidth_log2) + s; \ - const GLchan *tex00 = info->texture + COMPS * pos; \ - const GLchan *tex10 = tex00 + info->tbytesline; \ - const GLchan *tex01 = tex00 + COMPS; \ - const GLchan *tex11 = tex10 + COMPS; \ - if (t == info->tmask) { \ - tex10 -= info->tsize; \ - tex11 -= info->tsize; \ - } \ - if (s == info->smask) { \ - tex01 -= info->tbytesline; \ - tex11 -= info->tbytesline; \ - } \ - DO_TEX; \ - span->red += span->redStep; \ - span->green += span->greenStep; \ - span->blue += span->blueStep; \ - span->alpha += span->alphaStep; \ - span->intTex[0] += span->intTexStep[0]; \ - span->intTex[1] += span->intTexStep[1]; \ - dest += 4; \ - } - - - GLuint i; - GLchan *dest = span->array->rgba[0]; - - /* Disable tex units so they're not re-applied in swrast_write_rgba_span */ - ctx->Texture._EnabledCoordUnits = 0x0; - - span->intTex[0] -= FIXED_HALF; - span->intTex[1] -= FIXED_HALF; - switch (info->filter) { - case GL_NEAREST: - switch (info->format) { - case MESA_FORMAT_RGB888: - switch (info->envmode) { - case GL_MODULATE: - SPAN_NEAREST(NEAREST_RGB;MODULATE,3); - break; - case GL_DECAL: - case GL_REPLACE: - SPAN_NEAREST(NEAREST_RGB_REPLACE,3); - break; - case GL_BLEND: - SPAN_NEAREST(NEAREST_RGB;BLEND,3); - break; - case GL_ADD: - SPAN_NEAREST(NEAREST_RGB;ADD,3); - break; - default: - _mesa_problem(ctx, "bad tex env mode in SPAN_LINEAR"); - return; - } - break; - case MESA_FORMAT_RGBA8888: - switch(info->envmode) { - case GL_MODULATE: - SPAN_NEAREST(NEAREST_RGBA;MODULATE,4); - break; - case GL_DECAL: - SPAN_NEAREST(NEAREST_RGBA;DECAL,4); - break; - case GL_BLEND: - SPAN_NEAREST(NEAREST_RGBA;BLEND,4); - break; - case GL_ADD: - SPAN_NEAREST(NEAREST_RGBA;ADD,4); - break; - case GL_REPLACE: - SPAN_NEAREST(NEAREST_RGBA_REPLACE,4); - break; - default: - _mesa_problem(ctx, "bad tex env mode (2) in SPAN_LINEAR"); - return; - } - break; - } - break; - - case GL_LINEAR: - span->intTex[0] -= FIXED_HALF; - span->intTex[1] -= FIXED_HALF; - switch (info->format) { - case MESA_FORMAT_RGB888: - switch (info->envmode) { - case GL_MODULATE: - SPAN_LINEAR(LINEAR_RGB;MODULATE,3); - break; - case GL_DECAL: - case GL_REPLACE: - SPAN_LINEAR(LINEAR_RGB;REPLACE,3); - break; - case GL_BLEND: - SPAN_LINEAR(LINEAR_RGB;BLEND,3); - break; - case GL_ADD: - SPAN_LINEAR(LINEAR_RGB;ADD,3); - break; - default: - _mesa_problem(ctx, "bad tex env mode (3) in SPAN_LINEAR"); - return; - } - break; - case MESA_FORMAT_RGBA8888: - switch (info->envmode) { - case GL_MODULATE: - SPAN_LINEAR(LINEAR_RGBA;MODULATE,4); - break; - case GL_DECAL: - SPAN_LINEAR(LINEAR_RGBA;DECAL,4); - break; - case GL_BLEND: - SPAN_LINEAR(LINEAR_RGBA;BLEND,4); - break; - case GL_ADD: - SPAN_LINEAR(LINEAR_RGBA;ADD,4); - break; - case GL_REPLACE: - SPAN_LINEAR(LINEAR_RGBA;REPLACE,4); - break; - default: - _mesa_problem(ctx, "bad tex env mode (4) in SPAN_LINEAR"); - return; - } - break; - } - break; - } - span->interpMask &= ~SPAN_RGBA; - ASSERT(span->arrayMask & SPAN_RGBA); - - _swrast_write_rgba_span(ctx, span); - - /* re-enable texture units */ - ctx->Texture._EnabledCoordUnits = texEnableSave; - -#undef SPAN_NEAREST -#undef SPAN_LINEAR -} - - - -/* - * Render an RGB/RGBA textured triangle without perspective correction. - */ -#define NAME affine_textured_triangle -#define INTERP_Z 1 -#define INTERP_RGB 1 -#define INTERP_ALPHA 1 -#define INTERP_INT_TEX 1 -#define S_SCALE twidth -#define T_SCALE theight - -#define SETUP_CODE \ - struct affine_info info; \ - struct gl_texture_unit *unit = ctx->Texture.Unit+0; \ - const struct gl_texture_object *obj = \ - ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \ - const struct gl_texture_image *texImg = \ - obj->Image[0][obj->BaseLevel]; \ - const GLfloat twidth = (GLfloat) texImg->Width; \ - const GLfloat theight = (GLfloat) texImg->Height; \ - info.texture = (const GLchan *) texImg->Data; \ - info.twidth_log2 = texImg->WidthLog2; \ - info.smask = texImg->Width - 1; \ - info.tmask = texImg->Height - 1; \ - info.format = texImg->TexFormat; \ - info.filter = obj->MinFilter; \ - info.envmode = unit->EnvMode; \ - info.er = 0; \ - info.eg = 0; \ - info.eb = 0; \ - span.arrayMask |= SPAN_RGBA; \ - \ - if (info.envmode == GL_BLEND) { \ - /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \ - info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \ - info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \ - info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \ - info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \ - } \ - if (!info.texture) { \ - /* this shouldn't happen */ \ - return; \ - } \ - \ - switch (info.format) { \ - case MESA_FORMAT_RGB888: \ - info.tbytesline = texImg->Width * 3; \ - break; \ - case MESA_FORMAT_RGBA8888: \ - info.tbytesline = texImg->Width * 4; \ - break; \ - default: \ - _mesa_problem(NULL, "Bad texture format in affine_texture_triangle");\ - return; \ - } \ - info.tsize = texImg->Height * info.tbytesline; - -#define RENDER_SPAN( span ) affine_span(ctx, &span, &info); - -#include "s_tritemp.h" - - - -struct persp_info -{ - GLenum filter; - GLenum format; - GLenum envmode; - GLint smask, tmask; - GLint twidth_log2; - const GLchan *texture; - GLfixed er, eg, eb, ea; /* texture env color */ - GLint tbytesline, tsize; -}; - - -static INLINE void -fast_persp_span(GLcontext *ctx, SWspan *span, - struct persp_info *info) -{ - GLchan sample[4]; /* the filtered texture sample */ - - /* Instead of defining a function for each mode, a test is done - * between the outer and inner loops. This is to reduce code size - * and complexity. Observe that an optimizing compiler kills - * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST). - */ -#define SPAN_NEAREST(DO_TEX,COMP) \ - for (i = 0; i < span->end; i++) { \ - GLdouble invQ = tex_coord[2] ? \ - (1.0 / tex_coord[2]) : 1.0; \ - GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \ - GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \ - GLint s = IFLOOR(s_tmp) & info->smask; \ - GLint t = IFLOOR(t_tmp) & info->tmask; \ - GLint pos = (t << info->twidth_log2) + s; \ - const GLchan *tex00 = info->texture + COMP * pos; \ - DO_TEX; \ - span->red += span->redStep; \ - span->green += span->greenStep; \ - span->blue += span->blueStep; \ - span->alpha += span->alphaStep; \ - tex_coord[0] += tex_step[0]; \ - tex_coord[1] += tex_step[1]; \ - tex_coord[2] += tex_step[2]; \ - dest += 4; \ - } - -#define SPAN_LINEAR(DO_TEX,COMP) \ - for (i = 0; i < span->end; i++) { \ - GLdouble invQ = tex_coord[2] ? \ - (1.0 / tex_coord[2]) : 1.0; \ - const GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \ - const GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \ - const GLfixed s_fix = FloatToFixed(s_tmp) - FIXED_HALF; \ - const GLfixed t_fix = FloatToFixed(t_tmp) - FIXED_HALF; \ - const GLint s = FixedToInt(FixedFloor(s_fix)) & info->smask; \ - const GLint t = FixedToInt(FixedFloor(t_fix)) & info->tmask; \ - const GLfixed sf = s_fix & FIXED_FRAC_MASK; \ - const GLfixed tf = t_fix & FIXED_FRAC_MASK; \ - const GLint pos = (t << info->twidth_log2) + s; \ - const GLchan *tex00 = info->texture + COMP * pos; \ - const GLchan *tex10 = tex00 + info->tbytesline; \ - const GLchan *tex01 = tex00 + COMP; \ - const GLchan *tex11 = tex10 + COMP; \ - if (t == info->tmask) { \ - tex10 -= info->tsize; \ - tex11 -= info->tsize; \ - } \ - if (s == info->smask) { \ - tex01 -= info->tbytesline; \ - tex11 -= info->tbytesline; \ - } \ - DO_TEX; \ - span->red += span->redStep; \ - span->green += span->greenStep; \ - span->blue += span->blueStep; \ - span->alpha += span->alphaStep; \ - tex_coord[0] += tex_step[0]; \ - tex_coord[1] += tex_step[1]; \ - tex_coord[2] += tex_step[2]; \ - dest += 4; \ - } - - GLuint i; - GLfloat tex_coord[3], tex_step[3]; - GLchan *dest = span->array->rgba[0]; - - const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits; - ctx->Texture._EnabledCoordUnits = 0; - - tex_coord[0] = span->attrStart[FRAG_ATTRIB_TEX0][0] * (info->smask + 1); - tex_step[0] = span->attrStepX[FRAG_ATTRIB_TEX0][0] * (info->smask + 1); - tex_coord[1] = span->attrStart[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1); - tex_step[1] = span->attrStepX[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1); - /* span->attrStart[FRAG_ATTRIB_TEX0][2] only if 3D-texturing, here only 2D */ - tex_coord[2] = span->attrStart[FRAG_ATTRIB_TEX0][3]; - tex_step[2] = span->attrStepX[FRAG_ATTRIB_TEX0][3]; - - switch (info->filter) { - case GL_NEAREST: - switch (info->format) { - case MESA_FORMAT_RGB888: - switch (info->envmode) { - case GL_MODULATE: - SPAN_NEAREST(NEAREST_RGB;MODULATE,3); - break; - case GL_DECAL: - case GL_REPLACE: - SPAN_NEAREST(NEAREST_RGB_REPLACE,3); - break; - case GL_BLEND: - SPAN_NEAREST(NEAREST_RGB;BLEND,3); - break; - case GL_ADD: - SPAN_NEAREST(NEAREST_RGB;ADD,3); - break; - default: - _mesa_problem(ctx, "bad tex env mode (5) in SPAN_LINEAR"); - return; - } - break; - case MESA_FORMAT_RGBA8888: - switch(info->envmode) { - case GL_MODULATE: - SPAN_NEAREST(NEAREST_RGBA;MODULATE,4); - break; - case GL_DECAL: - SPAN_NEAREST(NEAREST_RGBA;DECAL,4); - break; - case GL_BLEND: - SPAN_NEAREST(NEAREST_RGBA;BLEND,4); - break; - case GL_ADD: - SPAN_NEAREST(NEAREST_RGBA;ADD,4); - break; - case GL_REPLACE: - SPAN_NEAREST(NEAREST_RGBA_REPLACE,4); - break; - default: - _mesa_problem(ctx, "bad tex env mode (6) in SPAN_LINEAR"); - return; - } - break; - } - break; - - case GL_LINEAR: - switch (info->format) { - case MESA_FORMAT_RGB888: - switch (info->envmode) { - case GL_MODULATE: - SPAN_LINEAR(LINEAR_RGB;MODULATE,3); - break; - case GL_DECAL: - case GL_REPLACE: - SPAN_LINEAR(LINEAR_RGB;REPLACE,3); - break; - case GL_BLEND: - SPAN_LINEAR(LINEAR_RGB;BLEND,3); - break; - case GL_ADD: - SPAN_LINEAR(LINEAR_RGB;ADD,3); - break; - default: - _mesa_problem(ctx, "bad tex env mode (7) in SPAN_LINEAR"); - return; - } - break; - case MESA_FORMAT_RGBA8888: - switch (info->envmode) { - case GL_MODULATE: - SPAN_LINEAR(LINEAR_RGBA;MODULATE,4); - break; - case GL_DECAL: - SPAN_LINEAR(LINEAR_RGBA;DECAL,4); - break; - case GL_BLEND: - SPAN_LINEAR(LINEAR_RGBA;BLEND,4); - break; - case GL_ADD: - SPAN_LINEAR(LINEAR_RGBA;ADD,4); - break; - case GL_REPLACE: - SPAN_LINEAR(LINEAR_RGBA;REPLACE,4); - break; - default: - _mesa_problem(ctx, "bad tex env mode (8) in SPAN_LINEAR"); - return; - } - break; - } - break; - } - - ASSERT(span->arrayMask & SPAN_RGBA); - _swrast_write_rgba_span(ctx, span); - -#undef SPAN_NEAREST -#undef SPAN_LINEAR - - /* restore state */ - ctx->Texture._EnabledCoordUnits = texEnableSave; -} - - -/* - * Render an perspective corrected RGB/RGBA textured triangle. - * The Q (aka V in Mesa) coordinate must be zero such that the divide - * by interpolated Q/W comes out right. - * - */ -#define NAME persp_textured_triangle -#define INTERP_Z 1 -#define INTERP_RGB 1 -#define INTERP_ALPHA 1 -#define INTERP_ATTRIBS 1 - -#define SETUP_CODE \ - struct persp_info info; \ - const struct gl_texture_unit *unit = ctx->Texture.Unit+0; \ - const struct gl_texture_object *obj = \ - ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \ - const struct gl_texture_image *texImg = \ - obj->Image[0][obj->BaseLevel]; \ - info.texture = (const GLchan *) texImg->Data; \ - info.twidth_log2 = texImg->WidthLog2; \ - info.smask = texImg->Width - 1; \ - info.tmask = texImg->Height - 1; \ - info.format = texImg->TexFormat; \ - info.filter = obj->MinFilter; \ - info.envmode = unit->EnvMode; \ - info.er = 0; \ - info.eg = 0; \ - info.eb = 0; \ - \ - if (info.envmode == GL_BLEND) { \ - /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \ - info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \ - info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \ - info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \ - info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \ - } \ - if (!info.texture) { \ - /* this shouldn't happen */ \ - return; \ - } \ - \ - switch (info.format) { \ - case MESA_FORMAT_RGB888: \ - info.tbytesline = texImg->Width * 3; \ - break; \ - case MESA_FORMAT_RGBA8888: \ - info.tbytesline = texImg->Width * 4; \ - break; \ - default: \ - _mesa_problem(NULL, "Bad texture format in persp_textured_triangle");\ - return; \ - } \ - info.tsize = texImg->Height * info.tbytesline; - -#define RENDER_SPAN( span ) \ - span.interpMask &= ~SPAN_RGBA; \ - span.arrayMask |= SPAN_RGBA; \ - fast_persp_span(ctx, &span, &info); - -#include "s_tritemp.h" - -#endif /*CHAN_TYPE != GL_FLOAT*/ - - - -/* - * Render an RGBA triangle with arbitrary attributes. - */ -#define NAME general_triangle -#define INTERP_Z 1 -#define INTERP_RGB 1 -#define INTERP_ALPHA 1 -#define INTERP_ATTRIBS 1 -#define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span); -#include "s_tritemp.h" - - - - -/* - * Special tri function for occlusion testing - */ -#define NAME occlusion_zless_triangle -#define INTERP_Z 1 -#define SETUP_CODE \ - struct gl_renderbuffer *rb = ctx->DrawBuffer->_DepthBuffer; \ - struct gl_query_object *q = ctx->Query.CurrentOcclusionObject; \ - ASSERT(ctx->Depth.Test); \ - ASSERT(!ctx->Depth.Mask); \ - ASSERT(ctx->Depth.Func == GL_LESS); \ - if (!q) { \ - return; \ - } -#define RENDER_SPAN( span ) \ - if (rb->Format == MESA_FORMAT_Z16) { \ - GLuint i; \ - const GLushort *zRow = (const GLushort *) \ - rb->GetPointer(ctx, rb, span.x, span.y); \ - for (i = 0; i < span.end; i++) { \ - GLuint z = FixedToDepth(span.z); \ - if (z < zRow[i]) { \ - q->Result++; \ - } \ - span.z += span.zStep; \ - } \ - } \ - else { \ - GLuint i; \ - const GLuint *zRow = (const GLuint *) \ - rb->GetPointer(ctx, rb, span.x, span.y); \ - for (i = 0; i < span.end; i++) { \ - if ((GLuint)span.z < zRow[i]) { \ - q->Result++; \ - } \ - span.z += span.zStep; \ - } \ - } -#include "s_tritemp.h" - - - -static void -nodraw_triangle( GLcontext *ctx, - const SWvertex *v0, - const SWvertex *v1, - const SWvertex *v2 ) -{ - (void) (ctx && v0 && v1 && v2); -} - - -/* - * This is used when separate specular color is enabled, but not - * texturing. We add the specular color to the primary color, - * draw the triangle, then restore the original primary color. - * Inefficient, but seldom needed. - */ -void -_swrast_add_spec_terms_triangle(GLcontext *ctx, const SWvertex *v0, - const SWvertex *v1, const SWvertex *v2) -{ - SWvertex *ncv0 = (SWvertex *)v0; /* drop const qualifier */ - SWvertex *ncv1 = (SWvertex *)v1; - SWvertex *ncv2 = (SWvertex *)v2; - GLfloat rSum, gSum, bSum; - GLchan cSave[3][4]; - - /* save original colors */ - COPY_CHAN4( cSave[0], ncv0->color ); - COPY_CHAN4( cSave[1], ncv1->color ); - COPY_CHAN4( cSave[2], ncv2->color ); - /* sum v0 */ - rSum = CHAN_TO_FLOAT(ncv0->color[0]) + ncv0->attrib[FRAG_ATTRIB_COL1][0]; - gSum = CHAN_TO_FLOAT(ncv0->color[1]) + ncv0->attrib[FRAG_ATTRIB_COL1][1]; - bSum = CHAN_TO_FLOAT(ncv0->color[2]) + ncv0->attrib[FRAG_ATTRIB_COL1][2]; - UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[0], rSum); - UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[1], gSum); - UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[2], bSum); - /* sum v1 */ - rSum = CHAN_TO_FLOAT(ncv1->color[0]) + ncv1->attrib[FRAG_ATTRIB_COL1][0]; - gSum = CHAN_TO_FLOAT(ncv1->color[1]) + ncv1->attrib[FRAG_ATTRIB_COL1][1]; - bSum = CHAN_TO_FLOAT(ncv1->color[2]) + ncv1->attrib[FRAG_ATTRIB_COL1][2]; - UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[0], rSum); - UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[1], gSum); - UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[2], bSum); - /* sum v2 */ - rSum = CHAN_TO_FLOAT(ncv2->color[0]) + ncv2->attrib[FRAG_ATTRIB_COL1][0]; - gSum = CHAN_TO_FLOAT(ncv2->color[1]) + ncv2->attrib[FRAG_ATTRIB_COL1][1]; - bSum = CHAN_TO_FLOAT(ncv2->color[2]) + ncv2->attrib[FRAG_ATTRIB_COL1][2]; - UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[0], rSum); - UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[1], gSum); - UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[2], bSum); - /* draw */ - SWRAST_CONTEXT(ctx)->SpecTriangle( ctx, ncv0, ncv1, ncv2 ); - /* restore original colors */ - COPY_CHAN4( ncv0->color, cSave[0] ); - COPY_CHAN4( ncv1->color, cSave[1] ); - COPY_CHAN4( ncv2->color, cSave[2] ); -} - - - -#ifdef DEBUG - -/* record the current triangle function name */ -const char *_mesa_triFuncName = NULL; - -#define USE(triFunc) \ -do { \ - _mesa_triFuncName = #triFunc; \ - /*printf("%s\n", _mesa_triFuncName);*/ \ - swrast->Triangle = triFunc; \ -} while (0) - -#else - -#define USE(triFunc) swrast->Triangle = triFunc; - -#endif - - - - -/* - * Determine which triangle rendering function to use given the current - * rendering context. - * - * Please update the summary flag _SWRAST_NEW_TRIANGLE if you add or - * remove tests to this code. - */ -void -_swrast_choose_triangle( GLcontext *ctx ) -{ - SWcontext *swrast = SWRAST_CONTEXT(ctx); - - if (ctx->Polygon.CullFlag && - ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) { - USE(nodraw_triangle); - return; - } - - if (ctx->RenderMode==GL_RENDER) { - - if (ctx->Polygon.SmoothFlag) { - _swrast_set_aa_triangle_function(ctx); - ASSERT(swrast->Triangle); - return; - } - - /* special case for occlusion testing */ - if (ctx->Query.CurrentOcclusionObject && - ctx->Depth.Test && - ctx->Depth.Mask == GL_FALSE && - ctx->Depth.Func == GL_LESS && - !ctx->Stencil._Enabled) { - if (ctx->Color.ColorMask[0][0] == 0 && - ctx->Color.ColorMask[0][1] == 0 && - ctx->Color.ColorMask[0][2] == 0 && - ctx->Color.ColorMask[0][3] == 0) { - USE(occlusion_zless_triangle); - return; - } - } - - /* - * XXX should examine swrast->_ActiveAttribMask to determine what - * needs to be interpolated. - */ - if (ctx->Texture._EnabledCoordUnits || - ctx->FragmentProgram._Current || - ctx->ATIFragmentShader._Enabled || - NEED_SECONDARY_COLOR(ctx) || - swrast->_FogEnabled) { - /* Ugh, we do a _lot_ of tests to pick the best textured tri func */ - const struct gl_texture_object *texObj2D; - const struct gl_texture_image *texImg; - GLenum minFilter, magFilter, envMode; - gl_format format; - texObj2D = ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; - - texImg = texObj2D ? texObj2D->Image[0][texObj2D->BaseLevel] : NULL; - format = texImg ? texImg->TexFormat : MESA_FORMAT_NONE; - minFilter = texObj2D ? texObj2D->MinFilter : GL_NONE; - magFilter = texObj2D ? texObj2D->MagFilter : GL_NONE; - envMode = ctx->Texture.Unit[0].EnvMode; - - /* First see if we can use an optimized 2-D texture function */ - if (ctx->Texture._EnabledCoordUnits == 0x1 - && !ctx->FragmentProgram._Current - && !ctx->ATIFragmentShader._Enabled - && ctx->Texture._EnabledUnits == 0x1 - && ctx->Texture.Unit[0]._ReallyEnabled == TEXTURE_2D_BIT - && texObj2D->WrapS == GL_REPEAT - && texObj2D->WrapT == GL_REPEAT - && texObj2D->_Swizzle == SWIZZLE_NOOP - && texImg->_IsPowerOfTwo - && texImg->Border == 0 - && texImg->Width == texImg->RowStride - && (format == MESA_FORMAT_RGB888 || format == MESA_FORMAT_RGBA8888) - && minFilter == magFilter - && ctx->Light.Model.ColorControl == GL_SINGLE_COLOR - && !swrast->_FogEnabled - && ctx->Texture.Unit[0].EnvMode != GL_COMBINE_EXT - && ctx->Texture.Unit[0].EnvMode != GL_COMBINE4_NV) { - if (ctx->Hint.PerspectiveCorrection==GL_FASTEST) { - if (minFilter == GL_NEAREST - && format == MESA_FORMAT_RGB888 - && (envMode == GL_REPLACE || envMode == GL_DECAL) - && ((swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT) - && ctx->Depth.Func == GL_LESS - && ctx->Depth.Mask == GL_TRUE) - || swrast->_RasterMask == TEXTURE_BIT) - && ctx->Polygon.StippleFlag == GL_FALSE - && ctx->DrawBuffer->Visual.depthBits <= 16) { - if (swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)) { - USE(simple_z_textured_triangle); - } - else { - USE(simple_textured_triangle); - } - } - else { -#if CHAN_BITS != 8 - USE(general_triangle); -#else - if (format == MESA_FORMAT_RGBA8888 && !_mesa_little_endian()) { - /* We only handle RGBA8888 correctly on little endian - * in the optimized code above. - */ - USE(general_triangle); - } - else { - USE(affine_textured_triangle); - } -#endif - } - } - else { -#if CHAN_BITS != 8 - USE(general_triangle); -#else - USE(persp_textured_triangle); -#endif - } - } - else { - /* general case textured triangles */ - USE(general_triangle); - } - } - else { - ASSERT(!swrast->_FogEnabled); - ASSERT(!NEED_SECONDARY_COLOR(ctx)); - if (ctx->Light.ShadeModel==GL_SMOOTH) { - /* smooth shaded, no texturing, stippled or some raster ops */ -#if CHAN_BITS != 8 - USE(general_triangle); -#else - USE(smooth_rgba_triangle); -#endif - } - else { - /* flat shaded, no texturing, stippled or some raster ops */ -#if CHAN_BITS != 8 - USE(general_triangle); -#else - USE(flat_rgba_triangle); -#endif - } - } - } - else if (ctx->RenderMode==GL_FEEDBACK) { - USE(_swrast_feedback_triangle); - } - else { - /* GL_SELECT mode */ - USE(_swrast_select_triangle); - } -} +/*
+ * Mesa 3-D graphics library
+ * Version: 7.3
+ *
+ * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * When the device driver doesn't implement triangle rasterization it
+ * can hook in _swrast_Triangle, which eventually calls one of these
+ * functions to draw triangles.
+ */
+
+#include "main/glheader.h"
+#include "main/context.h"
+#include "main/colormac.h"
+#include "main/imports.h"
+#include "main/macros.h"
+#include "main/texformat.h"
+#include "program/prog_instruction.h"
+
+#include "s_aatriangle.h"
+#include "s_context.h"
+#include "s_feedback.h"
+#include "s_span.h"
+#include "s_triangle.h"
+
+
+/**
+ * Test if a triangle should be culled. Used for feedback and selection mode.
+ * \return GL_TRUE if the triangle is to be culled, GL_FALSE otherwise.
+ */
+GLboolean
+_swrast_culltriangle( struct gl_context *ctx,
+ const SWvertex *v0,
+ const SWvertex *v1,
+ const SWvertex *v2 )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ GLfloat ex = v1->attrib[FRAG_ATTRIB_WPOS][0] - v0->attrib[FRAG_ATTRIB_WPOS][0];
+ GLfloat ey = v1->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][1];
+ GLfloat fx = v2->attrib[FRAG_ATTRIB_WPOS][0] - v0->attrib[FRAG_ATTRIB_WPOS][0];
+ GLfloat fy = v2->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][1];
+ GLfloat c = ex*fy-ey*fx;
+
+ if (c * swrast->_BackfaceSign * swrast->_BackfaceCullSign <= 0.0F)
+ return GL_FALSE;
+
+ return GL_TRUE;
+}
+
+
+
+/*
+ * Render a flat-shaded RGBA triangle.
+ */
+#define NAME flat_rgba_triangle
+#define INTERP_Z 1
+#define SETUP_CODE \
+ ASSERT(ctx->Texture._EnabledCoordUnits == 0);\
+ ASSERT(ctx->Light.ShadeModel==GL_FLAT); \
+ span.interpMask |= SPAN_RGBA; \
+ span.red = ChanToFixed(v2->color[0]); \
+ span.green = ChanToFixed(v2->color[1]); \
+ span.blue = ChanToFixed(v2->color[2]); \
+ span.alpha = ChanToFixed(v2->color[3]); \
+ span.redStep = 0; \
+ span.greenStep = 0; \
+ span.blueStep = 0; \
+ span.alphaStep = 0;
+#define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
+#include "s_tritemp.h"
+
+
+
+/*
+ * Render a smooth-shaded RGBA triangle.
+ */
+#define NAME smooth_rgba_triangle
+#define INTERP_Z 1
+#define INTERP_RGB 1
+#define INTERP_ALPHA 1
+#define SETUP_CODE \
+ { \
+ /* texturing must be off */ \
+ ASSERT(ctx->Texture._EnabledCoordUnits == 0); \
+ ASSERT(ctx->Light.ShadeModel==GL_SMOOTH); \
+ }
+#define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
+#include "s_tritemp.h"
+
+
+
+/*
+ * Render an RGB, GL_DECAL, textured triangle.
+ * Interpolate S,T only w/out mipmapping or perspective correction.
+ *
+ * No fog. No depth testing.
+ */
+#define NAME simple_textured_triangle
+#define INTERP_INT_TEX 1
+#define S_SCALE twidth
+#define T_SCALE theight
+
+#define SETUP_CODE \
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; \
+ const struct gl_texture_object *obj = \
+ ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
+ const struct gl_texture_image *texImg = \
+ obj->Image[0][obj->BaseLevel]; \
+ const GLfloat twidth = (GLfloat) texImg->Width; \
+ const GLfloat theight = (GLfloat) texImg->Height; \
+ const GLint twidth_log2 = texImg->WidthLog2; \
+ const GLubyte *texture = (const GLubyte *) texImg->Data; \
+ const GLint smask = texImg->Width - 1; \
+ const GLint tmask = texImg->Height - 1; \
+ ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888); \
+ if (!rb || !texture) { \
+ return; \
+ }
+
+#define RENDER_SPAN( span ) \
+ GLuint i; \
+ GLubyte rgb[MAX_WIDTH][3]; \
+ span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \
+ span.intTex[1] -= FIXED_HALF; \
+ for (i = 0; i < span.end; i++) { \
+ GLint s = FixedToInt(span.intTex[0]) & smask; \
+ GLint t = FixedToInt(span.intTex[1]) & tmask; \
+ GLint pos = (t << twidth_log2) + s; \
+ pos = pos + pos + pos; /* multiply by 3 */ \
+ rgb[i][RCOMP] = texture[pos+2]; \
+ rgb[i][GCOMP] = texture[pos+1]; \
+ rgb[i][BCOMP] = texture[pos+0]; \
+ span.intTex[0] += span.intTexStep[0]; \
+ span.intTex[1] += span.intTexStep[1]; \
+ } \
+ rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, NULL);
+
+#include "s_tritemp.h"
+
+
+
+/*
+ * Render an RGB, GL_DECAL, textured triangle.
+ * Interpolate S,T, GL_LESS depth test, w/out mipmapping or
+ * perspective correction.
+ * Depth buffer bits must be <= sizeof(DEFAULT_SOFTWARE_DEPTH_TYPE)
+ *
+ * No fog.
+ */
+#define NAME simple_z_textured_triangle
+#define INTERP_Z 1
+#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
+#define INTERP_INT_TEX 1
+#define S_SCALE twidth
+#define T_SCALE theight
+
+#define SETUP_CODE \
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; \
+ const struct gl_texture_object *obj = \
+ ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
+ const struct gl_texture_image *texImg = \
+ obj->Image[0][obj->BaseLevel]; \
+ const GLfloat twidth = (GLfloat) texImg->Width; \
+ const GLfloat theight = (GLfloat) texImg->Height; \
+ const GLint twidth_log2 = texImg->WidthLog2; \
+ const GLubyte *texture = (const GLubyte *) texImg->Data; \
+ const GLint smask = texImg->Width - 1; \
+ const GLint tmask = texImg->Height - 1; \
+ ASSERT(texImg->TexFormat == MESA_FORMAT_RGB888); \
+ if (!rb || !texture) { \
+ return; \
+ }
+
+#define RENDER_SPAN( span ) \
+ GLuint i; \
+ GLubyte rgb[MAX_WIDTH][3]; \
+ span.intTex[0] -= FIXED_HALF; /* off-by-one error? */ \
+ span.intTex[1] -= FIXED_HALF; \
+ for (i = 0; i < span.end; i++) { \
+ const GLuint z = FixedToDepth(span.z); \
+ if (z < zRow[i]) { \
+ GLint s = FixedToInt(span.intTex[0]) & smask; \
+ GLint t = FixedToInt(span.intTex[1]) & tmask; \
+ GLint pos = (t << twidth_log2) + s; \
+ pos = pos + pos + pos; /* multiply by 3 */ \
+ rgb[i][RCOMP] = texture[pos+2]; \
+ rgb[i][GCOMP] = texture[pos+1]; \
+ rgb[i][BCOMP] = texture[pos+0]; \
+ zRow[i] = z; \
+ span.array->mask[i] = 1; \
+ } \
+ else { \
+ span.array->mask[i] = 0; \
+ } \
+ span.intTex[0] += span.intTexStep[0]; \
+ span.intTex[1] += span.intTexStep[1]; \
+ span.z += span.zStep; \
+ } \
+ rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, rgb, span.array->mask);
+
+#include "s_tritemp.h"
+
+
+#if CHAN_TYPE != GL_FLOAT
+
+struct affine_info
+{
+ GLenum filter;
+ GLenum format;
+ GLenum envmode;
+ GLint smask, tmask;
+ GLint twidth_log2;
+ const GLchan *texture;
+ GLfixed er, eg, eb, ea;
+ GLint tbytesline, tsize;
+};
+
+
+static INLINE GLint
+ilerp(GLint t, GLint a, GLint b)
+{
+ return a + ((t * (b - a)) >> FIXED_SHIFT);
+}
+
+static INLINE GLint
+ilerp_2d(GLint ia, GLint ib, GLint v00, GLint v10, GLint v01, GLint v11)
+{
+ const GLint temp0 = ilerp(ia, v00, v10);
+ const GLint temp1 = ilerp(ia, v01, v11);
+ return ilerp(ib, temp0, temp1);
+}
+
+
+/* This function can handle GL_NEAREST or GL_LINEAR sampling of 2D RGB or RGBA
+ * textures with GL_REPLACE, GL_MODULATE, GL_BLEND, GL_DECAL or GL_ADD
+ * texture env modes.
+ */
+static INLINE void
+affine_span(struct gl_context *ctx, SWspan *span,
+ struct affine_info *info)
+{
+ GLchan sample[4]; /* the filtered texture sample */
+ const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits;
+
+ /* Instead of defining a function for each mode, a test is done
+ * between the outer and inner loops. This is to reduce code size
+ * and complexity. Observe that an optimizing compiler kills
+ * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
+ */
+
+#define NEAREST_RGB \
+ sample[RCOMP] = tex00[2]; \
+ sample[GCOMP] = tex00[1]; \
+ sample[BCOMP] = tex00[0]; \
+ sample[ACOMP] = CHAN_MAX;
+
+#define LINEAR_RGB \
+ sample[RCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\
+ sample[GCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\
+ sample[BCOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0]);\
+ sample[ACOMP] = CHAN_MAX;
+
+#define NEAREST_RGBA \
+ sample[RCOMP] = tex00[3]; \
+ sample[GCOMP] = tex00[2]; \
+ sample[BCOMP] = tex00[1]; \
+ sample[ACOMP] = tex00[0];
+
+#define LINEAR_RGBA \
+ sample[RCOMP] = ilerp_2d(sf, tf, tex00[3], tex01[3], tex10[3], tex11[3]);\
+ sample[GCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\
+ sample[BCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\
+ sample[ACOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0])
+
+#define MODULATE \
+ dest[RCOMP] = span->red * (sample[RCOMP] + 1u) >> (FIXED_SHIFT + 8); \
+ dest[GCOMP] = span->green * (sample[GCOMP] + 1u) >> (FIXED_SHIFT + 8); \
+ dest[BCOMP] = span->blue * (sample[BCOMP] + 1u) >> (FIXED_SHIFT + 8); \
+ dest[ACOMP] = span->alpha * (sample[ACOMP] + 1u) >> (FIXED_SHIFT + 8)
+
+#define DECAL \
+ dest[RCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->red + \
+ ((sample[ACOMP] + 1) * sample[RCOMP] << FIXED_SHIFT)) \
+ >> (FIXED_SHIFT + 8); \
+ dest[GCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->green + \
+ ((sample[ACOMP] + 1) * sample[GCOMP] << FIXED_SHIFT)) \
+ >> (FIXED_SHIFT + 8); \
+ dest[BCOMP] = ((CHAN_MAX - sample[ACOMP]) * span->blue + \
+ ((sample[ACOMP] + 1) * sample[BCOMP] << FIXED_SHIFT)) \
+ >> (FIXED_SHIFT + 8); \
+ dest[ACOMP] = FixedToInt(span->alpha)
+
+#define BLEND \
+ dest[RCOMP] = ((CHAN_MAX - sample[RCOMP]) * span->red \
+ + (sample[RCOMP] + 1) * info->er) >> (FIXED_SHIFT + 8); \
+ dest[GCOMP] = ((CHAN_MAX - sample[GCOMP]) * span->green \
+ + (sample[GCOMP] + 1) * info->eg) >> (FIXED_SHIFT + 8); \
+ dest[BCOMP] = ((CHAN_MAX - sample[BCOMP]) * span->blue \
+ + (sample[BCOMP] + 1) * info->eb) >> (FIXED_SHIFT + 8); \
+ dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8)
+
+#define REPLACE COPY_CHAN4(dest, sample)
+
+#define ADD \
+ { \
+ GLint rSum = FixedToInt(span->red) + (GLint) sample[RCOMP]; \
+ GLint gSum = FixedToInt(span->green) + (GLint) sample[GCOMP]; \
+ GLint bSum = FixedToInt(span->blue) + (GLint) sample[BCOMP]; \
+ dest[RCOMP] = MIN2(rSum, CHAN_MAX); \
+ dest[GCOMP] = MIN2(gSum, CHAN_MAX); \
+ dest[BCOMP] = MIN2(bSum, CHAN_MAX); \
+ dest[ACOMP] = span->alpha * (sample[ACOMP] + 1) >> (FIXED_SHIFT + 8); \
+ }
+
+/* shortcuts */
+
+#define NEAREST_RGB_REPLACE \
+ NEAREST_RGB; \
+ dest[0] = sample[0]; \
+ dest[1] = sample[1]; \
+ dest[2] = sample[2]; \
+ dest[3] = FixedToInt(span->alpha);
+
+#define NEAREST_RGBA_REPLACE \
+ dest[RCOMP] = tex00[3]; \
+ dest[GCOMP] = tex00[2]; \
+ dest[BCOMP] = tex00[1]; \
+ dest[ACOMP] = tex00[0]
+
+#define SPAN_NEAREST(DO_TEX, COMPS) \
+ for (i = 0; i < span->end; i++) { \
+ /* Isn't it necessary to use FixedFloor below?? */ \
+ GLint s = FixedToInt(span->intTex[0]) & info->smask; \
+ GLint t = FixedToInt(span->intTex[1]) & info->tmask; \
+ GLint pos = (t << info->twidth_log2) + s; \
+ const GLchan *tex00 = info->texture + COMPS * pos; \
+ DO_TEX; \
+ span->red += span->redStep; \
+ span->green += span->greenStep; \
+ span->blue += span->blueStep; \
+ span->alpha += span->alphaStep; \
+ span->intTex[0] += span->intTexStep[0]; \
+ span->intTex[1] += span->intTexStep[1]; \
+ dest += 4; \
+ }
+
+#define SPAN_LINEAR(DO_TEX, COMPS) \
+ for (i = 0; i < span->end; i++) { \
+ /* Isn't it necessary to use FixedFloor below?? */ \
+ const GLint s = FixedToInt(span->intTex[0]) & info->smask; \
+ const GLint t = FixedToInt(span->intTex[1]) & info->tmask; \
+ const GLfixed sf = span->intTex[0] & FIXED_FRAC_MASK; \
+ const GLfixed tf = span->intTex[1] & FIXED_FRAC_MASK; \
+ const GLint pos = (t << info->twidth_log2) + s; \
+ const GLchan *tex00 = info->texture + COMPS * pos; \
+ const GLchan *tex10 = tex00 + info->tbytesline; \
+ const GLchan *tex01 = tex00 + COMPS; \
+ const GLchan *tex11 = tex10 + COMPS; \
+ if (t == info->tmask) { \
+ tex10 -= info->tsize; \
+ tex11 -= info->tsize; \
+ } \
+ if (s == info->smask) { \
+ tex01 -= info->tbytesline; \
+ tex11 -= info->tbytesline; \
+ } \
+ DO_TEX; \
+ span->red += span->redStep; \
+ span->green += span->greenStep; \
+ span->blue += span->blueStep; \
+ span->alpha += span->alphaStep; \
+ span->intTex[0] += span->intTexStep[0]; \
+ span->intTex[1] += span->intTexStep[1]; \
+ dest += 4; \
+ }
+
+
+ GLuint i;
+ GLchan *dest = span->array->rgba[0];
+
+ /* Disable tex units so they're not re-applied in swrast_write_rgba_span */
+ ctx->Texture._EnabledCoordUnits = 0x0;
+
+ span->intTex[0] -= FIXED_HALF;
+ span->intTex[1] -= FIXED_HALF;
+ switch (info->filter) {
+ case GL_NEAREST:
+ switch (info->format) {
+ case MESA_FORMAT_RGB888:
+ switch (info->envmode) {
+ case GL_MODULATE:
+ SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
+ break;
+ case GL_DECAL:
+ case GL_REPLACE:
+ SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
+ break;
+ case GL_BLEND:
+ SPAN_NEAREST(NEAREST_RGB;BLEND,3);
+ break;
+ case GL_ADD:
+ SPAN_NEAREST(NEAREST_RGB;ADD,3);
+ break;
+ default:
+ _mesa_problem(ctx, "bad tex env mode in SPAN_LINEAR");
+ return;
+ }
+ break;
+ case MESA_FORMAT_RGBA8888:
+ switch(info->envmode) {
+ case GL_MODULATE:
+ SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
+ break;
+ case GL_DECAL:
+ SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
+ break;
+ case GL_BLEND:
+ SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
+ break;
+ case GL_ADD:
+ SPAN_NEAREST(NEAREST_RGBA;ADD,4);
+ break;
+ case GL_REPLACE:
+ SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
+ break;
+ default:
+ _mesa_problem(ctx, "bad tex env mode (2) in SPAN_LINEAR");
+ return;
+ }
+ break;
+ }
+ break;
+
+ case GL_LINEAR:
+ span->intTex[0] -= FIXED_HALF;
+ span->intTex[1] -= FIXED_HALF;
+ switch (info->format) {
+ case MESA_FORMAT_RGB888:
+ switch (info->envmode) {
+ case GL_MODULATE:
+ SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
+ break;
+ case GL_DECAL:
+ case GL_REPLACE:
+ SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
+ break;
+ case GL_BLEND:
+ SPAN_LINEAR(LINEAR_RGB;BLEND,3);
+ break;
+ case GL_ADD:
+ SPAN_LINEAR(LINEAR_RGB;ADD,3);
+ break;
+ default:
+ _mesa_problem(ctx, "bad tex env mode (3) in SPAN_LINEAR");
+ return;
+ }
+ break;
+ case MESA_FORMAT_RGBA8888:
+ switch (info->envmode) {
+ case GL_MODULATE:
+ SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
+ break;
+ case GL_DECAL:
+ SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
+ break;
+ case GL_BLEND:
+ SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
+ break;
+ case GL_ADD:
+ SPAN_LINEAR(LINEAR_RGBA;ADD,4);
+ break;
+ case GL_REPLACE:
+ SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
+ break;
+ default:
+ _mesa_problem(ctx, "bad tex env mode (4) in SPAN_LINEAR");
+ return;
+ }
+ break;
+ }
+ break;
+ }
+ span->interpMask &= ~SPAN_RGBA;
+ ASSERT(span->arrayMask & SPAN_RGBA);
+
+ _swrast_write_rgba_span(ctx, span);
+
+ /* re-enable texture units */
+ ctx->Texture._EnabledCoordUnits = texEnableSave;
+
+#undef SPAN_NEAREST
+#undef SPAN_LINEAR
+}
+
+
+
+/*
+ * Render an RGB/RGBA textured triangle without perspective correction.
+ */
+#define NAME affine_textured_triangle
+#define INTERP_Z 1
+#define INTERP_RGB 1
+#define INTERP_ALPHA 1
+#define INTERP_INT_TEX 1
+#define S_SCALE twidth
+#define T_SCALE theight
+
+#define SETUP_CODE \
+ struct affine_info info; \
+ struct gl_texture_unit *unit = ctx->Texture.Unit+0; \
+ const struct gl_texture_object *obj = \
+ ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
+ const struct gl_texture_image *texImg = \
+ obj->Image[0][obj->BaseLevel]; \
+ const GLfloat twidth = (GLfloat) texImg->Width; \
+ const GLfloat theight = (GLfloat) texImg->Height; \
+ info.texture = (const GLchan *) texImg->Data; \
+ info.twidth_log2 = texImg->WidthLog2; \
+ info.smask = texImg->Width - 1; \
+ info.tmask = texImg->Height - 1; \
+ info.format = texImg->TexFormat; \
+ info.filter = obj->MinFilter; \
+ info.envmode = unit->EnvMode; \
+ info.er = 0; \
+ info.eg = 0; \
+ info.eb = 0; \
+ span.arrayMask |= SPAN_RGBA; \
+ \
+ if (info.envmode == GL_BLEND) { \
+ /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
+ info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \
+ info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \
+ info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \
+ info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \
+ } \
+ if (!info.texture) { \
+ /* this shouldn't happen */ \
+ return; \
+ } \
+ \
+ switch (info.format) { \
+ case MESA_FORMAT_RGB888: \
+ info.tbytesline = texImg->Width * 3; \
+ break; \
+ case MESA_FORMAT_RGBA8888: \
+ info.tbytesline = texImg->Width * 4; \
+ break; \
+ default: \
+ _mesa_problem(NULL, "Bad texture format in affine_texture_triangle");\
+ return; \
+ } \
+ info.tsize = texImg->Height * info.tbytesline;
+
+#define RENDER_SPAN( span ) affine_span(ctx, &span, &info);
+
+#include "s_tritemp.h"
+
+
+
+struct persp_info
+{
+ GLenum filter;
+ GLenum format;
+ GLenum envmode;
+ GLint smask, tmask;
+ GLint twidth_log2;
+ const GLchan *texture;
+ GLfixed er, eg, eb, ea; /* texture env color */
+ GLint tbytesline, tsize;
+};
+
+
+static INLINE void
+fast_persp_span(struct gl_context *ctx, SWspan *span,
+ struct persp_info *info)
+{
+ GLchan sample[4]; /* the filtered texture sample */
+
+ /* Instead of defining a function for each mode, a test is done
+ * between the outer and inner loops. This is to reduce code size
+ * and complexity. Observe that an optimizing compiler kills
+ * unused variables (for instance tf,sf,ti,si in case of GL_NEAREST).
+ */
+#define SPAN_NEAREST(DO_TEX,COMP) \
+ for (i = 0; i < span->end; i++) { \
+ GLdouble invQ = tex_coord[2] ? \
+ (1.0 / tex_coord[2]) : 1.0; \
+ GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \
+ GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \
+ GLint s = IFLOOR(s_tmp) & info->smask; \
+ GLint t = IFLOOR(t_tmp) & info->tmask; \
+ GLint pos = (t << info->twidth_log2) + s; \
+ const GLchan *tex00 = info->texture + COMP * pos; \
+ DO_TEX; \
+ span->red += span->redStep; \
+ span->green += span->greenStep; \
+ span->blue += span->blueStep; \
+ span->alpha += span->alphaStep; \
+ tex_coord[0] += tex_step[0]; \
+ tex_coord[1] += tex_step[1]; \
+ tex_coord[2] += tex_step[2]; \
+ dest += 4; \
+ }
+
+#define SPAN_LINEAR(DO_TEX,COMP) \
+ for (i = 0; i < span->end; i++) { \
+ GLdouble invQ = tex_coord[2] ? \
+ (1.0 / tex_coord[2]) : 1.0; \
+ const GLfloat s_tmp = (GLfloat) (tex_coord[0] * invQ); \
+ const GLfloat t_tmp = (GLfloat) (tex_coord[1] * invQ); \
+ const GLfixed s_fix = FloatToFixed(s_tmp) - FIXED_HALF; \
+ const GLfixed t_fix = FloatToFixed(t_tmp) - FIXED_HALF; \
+ const GLint s = FixedToInt(FixedFloor(s_fix)) & info->smask; \
+ const GLint t = FixedToInt(FixedFloor(t_fix)) & info->tmask; \
+ const GLfixed sf = s_fix & FIXED_FRAC_MASK; \
+ const GLfixed tf = t_fix & FIXED_FRAC_MASK; \
+ const GLint pos = (t << info->twidth_log2) + s; \
+ const GLchan *tex00 = info->texture + COMP * pos; \
+ const GLchan *tex10 = tex00 + info->tbytesline; \
+ const GLchan *tex01 = tex00 + COMP; \
+ const GLchan *tex11 = tex10 + COMP; \
+ if (t == info->tmask) { \
+ tex10 -= info->tsize; \
+ tex11 -= info->tsize; \
+ } \
+ if (s == info->smask) { \
+ tex01 -= info->tbytesline; \
+ tex11 -= info->tbytesline; \
+ } \
+ DO_TEX; \
+ span->red += span->redStep; \
+ span->green += span->greenStep; \
+ span->blue += span->blueStep; \
+ span->alpha += span->alphaStep; \
+ tex_coord[0] += tex_step[0]; \
+ tex_coord[1] += tex_step[1]; \
+ tex_coord[2] += tex_step[2]; \
+ dest += 4; \
+ }
+
+ GLuint i;
+ GLfloat tex_coord[3], tex_step[3];
+ GLchan *dest = span->array->rgba[0];
+
+ const GLuint texEnableSave = ctx->Texture._EnabledCoordUnits;
+ ctx->Texture._EnabledCoordUnits = 0;
+
+ tex_coord[0] = span->attrStart[FRAG_ATTRIB_TEX0][0] * (info->smask + 1);
+ tex_step[0] = span->attrStepX[FRAG_ATTRIB_TEX0][0] * (info->smask + 1);
+ tex_coord[1] = span->attrStart[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1);
+ tex_step[1] = span->attrStepX[FRAG_ATTRIB_TEX0][1] * (info->tmask + 1);
+ /* span->attrStart[FRAG_ATTRIB_TEX0][2] only if 3D-texturing, here only 2D */
+ tex_coord[2] = span->attrStart[FRAG_ATTRIB_TEX0][3];
+ tex_step[2] = span->attrStepX[FRAG_ATTRIB_TEX0][3];
+
+ switch (info->filter) {
+ case GL_NEAREST:
+ switch (info->format) {
+ case MESA_FORMAT_RGB888:
+ switch (info->envmode) {
+ case GL_MODULATE:
+ SPAN_NEAREST(NEAREST_RGB;MODULATE,3);
+ break;
+ case GL_DECAL:
+ case GL_REPLACE:
+ SPAN_NEAREST(NEAREST_RGB_REPLACE,3);
+ break;
+ case GL_BLEND:
+ SPAN_NEAREST(NEAREST_RGB;BLEND,3);
+ break;
+ case GL_ADD:
+ SPAN_NEAREST(NEAREST_RGB;ADD,3);
+ break;
+ default:
+ _mesa_problem(ctx, "bad tex env mode (5) in SPAN_LINEAR");
+ return;
+ }
+ break;
+ case MESA_FORMAT_RGBA8888:
+ switch(info->envmode) {
+ case GL_MODULATE:
+ SPAN_NEAREST(NEAREST_RGBA;MODULATE,4);
+ break;
+ case GL_DECAL:
+ SPAN_NEAREST(NEAREST_RGBA;DECAL,4);
+ break;
+ case GL_BLEND:
+ SPAN_NEAREST(NEAREST_RGBA;BLEND,4);
+ break;
+ case GL_ADD:
+ SPAN_NEAREST(NEAREST_RGBA;ADD,4);
+ break;
+ case GL_REPLACE:
+ SPAN_NEAREST(NEAREST_RGBA_REPLACE,4);
+ break;
+ default:
+ _mesa_problem(ctx, "bad tex env mode (6) in SPAN_LINEAR");
+ return;
+ }
+ break;
+ }
+ break;
+
+ case GL_LINEAR:
+ switch (info->format) {
+ case MESA_FORMAT_RGB888:
+ switch (info->envmode) {
+ case GL_MODULATE:
+ SPAN_LINEAR(LINEAR_RGB;MODULATE,3);
+ break;
+ case GL_DECAL:
+ case GL_REPLACE:
+ SPAN_LINEAR(LINEAR_RGB;REPLACE,3);
+ break;
+ case GL_BLEND:
+ SPAN_LINEAR(LINEAR_RGB;BLEND,3);
+ break;
+ case GL_ADD:
+ SPAN_LINEAR(LINEAR_RGB;ADD,3);
+ break;
+ default:
+ _mesa_problem(ctx, "bad tex env mode (7) in SPAN_LINEAR");
+ return;
+ }
+ break;
+ case MESA_FORMAT_RGBA8888:
+ switch (info->envmode) {
+ case GL_MODULATE:
+ SPAN_LINEAR(LINEAR_RGBA;MODULATE,4);
+ break;
+ case GL_DECAL:
+ SPAN_LINEAR(LINEAR_RGBA;DECAL,4);
+ break;
+ case GL_BLEND:
+ SPAN_LINEAR(LINEAR_RGBA;BLEND,4);
+ break;
+ case GL_ADD:
+ SPAN_LINEAR(LINEAR_RGBA;ADD,4);
+ break;
+ case GL_REPLACE:
+ SPAN_LINEAR(LINEAR_RGBA;REPLACE,4);
+ break;
+ default:
+ _mesa_problem(ctx, "bad tex env mode (8) in SPAN_LINEAR");
+ return;
+ }
+ break;
+ }
+ break;
+ }
+
+ ASSERT(span->arrayMask & SPAN_RGBA);
+ _swrast_write_rgba_span(ctx, span);
+
+#undef SPAN_NEAREST
+#undef SPAN_LINEAR
+
+ /* restore state */
+ ctx->Texture._EnabledCoordUnits = texEnableSave;
+}
+
+
+/*
+ * Render an perspective corrected RGB/RGBA textured triangle.
+ * The Q (aka V in Mesa) coordinate must be zero such that the divide
+ * by interpolated Q/W comes out right.
+ *
+ */
+#define NAME persp_textured_triangle
+#define INTERP_Z 1
+#define INTERP_RGB 1
+#define INTERP_ALPHA 1
+#define INTERP_ATTRIBS 1
+
+#define SETUP_CODE \
+ struct persp_info info; \
+ const struct gl_texture_unit *unit = ctx->Texture.Unit+0; \
+ const struct gl_texture_object *obj = \
+ ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \
+ const struct gl_texture_image *texImg = \
+ obj->Image[0][obj->BaseLevel]; \
+ info.texture = (const GLchan *) texImg->Data; \
+ info.twidth_log2 = texImg->WidthLog2; \
+ info.smask = texImg->Width - 1; \
+ info.tmask = texImg->Height - 1; \
+ info.format = texImg->TexFormat; \
+ info.filter = obj->MinFilter; \
+ info.envmode = unit->EnvMode; \
+ info.er = 0; \
+ info.eg = 0; \
+ info.eb = 0; \
+ \
+ if (info.envmode == GL_BLEND) { \
+ /* potential off-by-one error here? (1.0f -> 2048 -> 0) */ \
+ info.er = FloatToFixed(unit->EnvColor[RCOMP] * CHAN_MAXF); \
+ info.eg = FloatToFixed(unit->EnvColor[GCOMP] * CHAN_MAXF); \
+ info.eb = FloatToFixed(unit->EnvColor[BCOMP] * CHAN_MAXF); \
+ info.ea = FloatToFixed(unit->EnvColor[ACOMP] * CHAN_MAXF); \
+ } \
+ if (!info.texture) { \
+ /* this shouldn't happen */ \
+ return; \
+ } \
+ \
+ switch (info.format) { \
+ case MESA_FORMAT_RGB888: \
+ info.tbytesline = texImg->Width * 3; \
+ break; \
+ case MESA_FORMAT_RGBA8888: \
+ info.tbytesline = texImg->Width * 4; \
+ break; \
+ default: \
+ _mesa_problem(NULL, "Bad texture format in persp_textured_triangle");\
+ return; \
+ } \
+ info.tsize = texImg->Height * info.tbytesline;
+
+#define RENDER_SPAN( span ) \
+ span.interpMask &= ~SPAN_RGBA; \
+ span.arrayMask |= SPAN_RGBA; \
+ fast_persp_span(ctx, &span, &info);
+
+#include "s_tritemp.h"
+
+#endif /*CHAN_TYPE != GL_FLOAT*/
+
+
+
+/*
+ * Render an RGBA triangle with arbitrary attributes.
+ */
+#define NAME general_triangle
+#define INTERP_Z 1
+#define INTERP_RGB 1
+#define INTERP_ALPHA 1
+#define INTERP_ATTRIBS 1
+#define RENDER_SPAN( span ) _swrast_write_rgba_span(ctx, &span);
+#include "s_tritemp.h"
+
+
+
+
+/*
+ * Special tri function for occlusion testing
+ */
+#define NAME occlusion_zless_triangle
+#define INTERP_Z 1
+#define SETUP_CODE \
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_DepthBuffer; \
+ struct gl_query_object *q = ctx->Query.CurrentOcclusionObject; \
+ ASSERT(ctx->Depth.Test); \
+ ASSERT(!ctx->Depth.Mask); \
+ ASSERT(ctx->Depth.Func == GL_LESS); \
+ if (!q) { \
+ return; \
+ }
+#define RENDER_SPAN( span ) \
+ if (rb->Format == MESA_FORMAT_Z16) { \
+ GLuint i; \
+ const GLushort *zRow = (const GLushort *) \
+ rb->GetPointer(ctx, rb, span.x, span.y); \
+ for (i = 0; i < span.end; i++) { \
+ GLuint z = FixedToDepth(span.z); \
+ if (z < zRow[i]) { \
+ q->Result++; \
+ } \
+ span.z += span.zStep; \
+ } \
+ } \
+ else { \
+ GLuint i; \
+ const GLuint *zRow = (const GLuint *) \
+ rb->GetPointer(ctx, rb, span.x, span.y); \
+ for (i = 0; i < span.end; i++) { \
+ if ((GLuint)span.z < zRow[i]) { \
+ q->Result++; \
+ } \
+ span.z += span.zStep; \
+ } \
+ }
+#include "s_tritemp.h"
+
+
+
+static void
+nodraw_triangle( struct gl_context *ctx,
+ const SWvertex *v0,
+ const SWvertex *v1,
+ const SWvertex *v2 )
+{
+ (void) (ctx && v0 && v1 && v2);
+}
+
+
+/*
+ * This is used when separate specular color is enabled, but not
+ * texturing. We add the specular color to the primary color,
+ * draw the triangle, then restore the original primary color.
+ * Inefficient, but seldom needed.
+ */
+void
+_swrast_add_spec_terms_triangle(struct gl_context *ctx, const SWvertex *v0,
+ const SWvertex *v1, const SWvertex *v2)
+{
+ SWvertex *ncv0 = (SWvertex *)v0; /* drop const qualifier */
+ SWvertex *ncv1 = (SWvertex *)v1;
+ SWvertex *ncv2 = (SWvertex *)v2;
+ GLfloat rSum, gSum, bSum;
+ GLchan cSave[3][4];
+
+ /* save original colors */
+ COPY_CHAN4( cSave[0], ncv0->color );
+ COPY_CHAN4( cSave[1], ncv1->color );
+ COPY_CHAN4( cSave[2], ncv2->color );
+ /* sum v0 */
+ rSum = CHAN_TO_FLOAT(ncv0->color[0]) + ncv0->attrib[FRAG_ATTRIB_COL1][0];
+ gSum = CHAN_TO_FLOAT(ncv0->color[1]) + ncv0->attrib[FRAG_ATTRIB_COL1][1];
+ bSum = CHAN_TO_FLOAT(ncv0->color[2]) + ncv0->attrib[FRAG_ATTRIB_COL1][2];
+ UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[0], rSum);
+ UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[1], gSum);
+ UNCLAMPED_FLOAT_TO_CHAN(ncv0->color[2], bSum);
+ /* sum v1 */
+ rSum = CHAN_TO_FLOAT(ncv1->color[0]) + ncv1->attrib[FRAG_ATTRIB_COL1][0];
+ gSum = CHAN_TO_FLOAT(ncv1->color[1]) + ncv1->attrib[FRAG_ATTRIB_COL1][1];
+ bSum = CHAN_TO_FLOAT(ncv1->color[2]) + ncv1->attrib[FRAG_ATTRIB_COL1][2];
+ UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[0], rSum);
+ UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[1], gSum);
+ UNCLAMPED_FLOAT_TO_CHAN(ncv1->color[2], bSum);
+ /* sum v2 */
+ rSum = CHAN_TO_FLOAT(ncv2->color[0]) + ncv2->attrib[FRAG_ATTRIB_COL1][0];
+ gSum = CHAN_TO_FLOAT(ncv2->color[1]) + ncv2->attrib[FRAG_ATTRIB_COL1][1];
+ bSum = CHAN_TO_FLOAT(ncv2->color[2]) + ncv2->attrib[FRAG_ATTRIB_COL1][2];
+ UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[0], rSum);
+ UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[1], gSum);
+ UNCLAMPED_FLOAT_TO_CHAN(ncv2->color[2], bSum);
+ /* draw */
+ SWRAST_CONTEXT(ctx)->SpecTriangle( ctx, ncv0, ncv1, ncv2 );
+ /* restore original colors */
+ COPY_CHAN4( ncv0->color, cSave[0] );
+ COPY_CHAN4( ncv1->color, cSave[1] );
+ COPY_CHAN4( ncv2->color, cSave[2] );
+}
+
+
+
+#ifdef DEBUG
+
+/* record the current triangle function name */
+const char *_mesa_triFuncName = NULL;
+
+#define USE(triFunc) \
+do { \
+ _mesa_triFuncName = #triFunc; \
+ /*printf("%s\n", _mesa_triFuncName);*/ \
+ swrast->Triangle = triFunc; \
+} while (0)
+
+#else
+
+#define USE(triFunc) swrast->Triangle = triFunc;
+
+#endif
+
+
+
+
+/*
+ * Determine which triangle rendering function to use given the current
+ * rendering context.
+ *
+ * Please update the summary flag _SWRAST_NEW_TRIANGLE if you add or
+ * remove tests to this code.
+ */
+void
+_swrast_choose_triangle( struct gl_context *ctx )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+
+ if (ctx->Polygon.CullFlag &&
+ ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
+ USE(nodraw_triangle);
+ return;
+ }
+
+ if (ctx->RenderMode==GL_RENDER) {
+
+ if (ctx->Polygon.SmoothFlag) {
+ _swrast_set_aa_triangle_function(ctx);
+ ASSERT(swrast->Triangle);
+ return;
+ }
+
+ /* special case for occlusion testing */
+ if (ctx->Query.CurrentOcclusionObject &&
+ ctx->Depth.Test &&
+ ctx->Depth.Mask == GL_FALSE &&
+ ctx->Depth.Func == GL_LESS &&
+ !ctx->Stencil._Enabled) {
+ if (ctx->Color.ColorMask[0][0] == 0 &&
+ ctx->Color.ColorMask[0][1] == 0 &&
+ ctx->Color.ColorMask[0][2] == 0 &&
+ ctx->Color.ColorMask[0][3] == 0) {
+ USE(occlusion_zless_triangle);
+ return;
+ }
+ }
+
+ /*
+ * XXX should examine swrast->_ActiveAttribMask to determine what
+ * needs to be interpolated.
+ */
+ if (ctx->Texture._EnabledCoordUnits ||
+ ctx->FragmentProgram._Current ||
+ ctx->ATIFragmentShader._Enabled ||
+ NEED_SECONDARY_COLOR(ctx) ||
+ swrast->_FogEnabled) {
+ /* Ugh, we do a _lot_ of tests to pick the best textured tri func */
+ const struct gl_texture_object *texObj2D;
+ const struct gl_texture_image *texImg;
+ GLenum minFilter, magFilter, envMode;
+ gl_format format;
+ texObj2D = ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX];
+
+ texImg = texObj2D ? texObj2D->Image[0][texObj2D->BaseLevel] : NULL;
+ format = texImg ? texImg->TexFormat : MESA_FORMAT_NONE;
+ minFilter = texObj2D ? texObj2D->MinFilter : GL_NONE;
+ magFilter = texObj2D ? texObj2D->MagFilter : GL_NONE;
+ envMode = ctx->Texture.Unit[0].EnvMode;
+
+ /* First see if we can use an optimized 2-D texture function */
+ if (ctx->Texture._EnabledCoordUnits == 0x1
+ && !ctx->FragmentProgram._Current
+ && !ctx->ATIFragmentShader._Enabled
+ && ctx->Texture._EnabledUnits == 0x1
+ && ctx->Texture.Unit[0]._ReallyEnabled == TEXTURE_2D_BIT
+ && texObj2D->WrapS == GL_REPEAT
+ && texObj2D->WrapT == GL_REPEAT
+ && texObj2D->_Swizzle == SWIZZLE_NOOP
+ && texImg->_IsPowerOfTwo
+ && texImg->Border == 0
+ && texImg->Width == texImg->RowStride
+ && (format == MESA_FORMAT_RGB888 || format == MESA_FORMAT_RGBA8888)
+ && minFilter == magFilter
+ && ctx->Light.Model.ColorControl == GL_SINGLE_COLOR
+ && !swrast->_FogEnabled
+ && ctx->Texture.Unit[0].EnvMode != GL_COMBINE_EXT
+ && ctx->Texture.Unit[0].EnvMode != GL_COMBINE4_NV) {
+ if (ctx->Hint.PerspectiveCorrection==GL_FASTEST) {
+ if (minFilter == GL_NEAREST
+ && format == MESA_FORMAT_RGB888
+ && (envMode == GL_REPLACE || envMode == GL_DECAL)
+ && ((swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)
+ && ctx->Depth.Func == GL_LESS
+ && ctx->Depth.Mask == GL_TRUE)
+ || swrast->_RasterMask == TEXTURE_BIT)
+ && ctx->Polygon.StippleFlag == GL_FALSE
+ && ctx->DrawBuffer->Visual.depthBits <= 16) {
+ if (swrast->_RasterMask == (DEPTH_BIT | TEXTURE_BIT)) {
+ USE(simple_z_textured_triangle);
+ }
+ else {
+ USE(simple_textured_triangle);
+ }
+ }
+ else {
+#if CHAN_BITS != 8
+ USE(general_triangle);
+#else
+ if (format == MESA_FORMAT_RGBA8888 && !_mesa_little_endian()) {
+ /* We only handle RGBA8888 correctly on little endian
+ * in the optimized code above.
+ */
+ USE(general_triangle);
+ }
+ else {
+ USE(affine_textured_triangle);
+ }
+#endif
+ }
+ }
+ else {
+#if CHAN_BITS != 8
+ USE(general_triangle);
+#else
+ USE(persp_textured_triangle);
+#endif
+ }
+ }
+ else {
+ /* general case textured triangles */
+ USE(general_triangle);
+ }
+ }
+ else {
+ ASSERT(!swrast->_FogEnabled);
+ ASSERT(!NEED_SECONDARY_COLOR(ctx));
+ if (ctx->Light.ShadeModel==GL_SMOOTH) {
+ /* smooth shaded, no texturing, stippled or some raster ops */
+#if CHAN_BITS != 8
+ USE(general_triangle);
+#else
+ USE(smooth_rgba_triangle);
+#endif
+ }
+ else {
+ /* flat shaded, no texturing, stippled or some raster ops */
+#if CHAN_BITS != 8
+ USE(general_triangle);
+#else
+ USE(flat_rgba_triangle);
+#endif
+ }
+ }
+ }
+ else if (ctx->RenderMode==GL_FEEDBACK) {
+ USE(_swrast_feedback_triangle);
+ }
+ else {
+ /* GL_SELECT mode */
+ USE(_swrast_select_triangle);
+ }
+}
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