diff options
Diffstat (limited to 'mesalib/src/mesa/swrast/s_triangle.c')
| -rw-r--r-- | mesalib/src/mesa/swrast/s_triangle.c | 1150 |
1 files changed, 1150 insertions, 0 deletions
diff --git a/mesalib/src/mesa/swrast/s_triangle.c b/mesalib/src/mesa/swrast/s_triangle.c new file mode 100644 index 000000000..1ab0e19f9 --- /dev/null +++ b/mesalib/src/mesa/swrast/s_triangle.c @@ -0,0 +1,1150 @@ +/* + * 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 "shader/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 smooth or flat-shaded color index triangle. + */ +#define NAME ci_triangle +#define INTERP_Z 1 +#define INTERP_ATTRIBS 1 /* just for fog */ +#define INTERP_INDEX 1 +#define RENDER_SPAN( span ) _swrast_write_index_span(ctx, &span); +#include "s_tritemp.h" + + + +/* + * 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]; \ + struct gl_texture_object *obj = \ + ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \ + const GLint b = obj->BaseLevel; \ + const GLfloat twidth = (GLfloat) obj->Image[0][b]->Width; \ + const GLfloat theight = (GLfloat) obj->Image[0][b]->Height; \ + const GLint twidth_log2 = obj->Image[0][b]->WidthLog2; \ + const GLchan *texture = (const GLchan *) obj->Image[0][b]->Data; \ + const GLint smask = obj->Image[0][b]->Width - 1; \ + const GLint tmask = obj->Image[0][b]->Height - 1; \ + if (!rb || !texture) { \ + return; \ + } + +#define RENDER_SPAN( span ) \ + GLuint i; \ + GLchan 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]; \ + rgb[i][GCOMP] = texture[pos+1]; \ + rgb[i][BCOMP] = texture[pos+2]; \ + 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]; \ + struct gl_texture_object *obj = \ + ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \ + const GLint b = obj->BaseLevel; \ + const GLfloat twidth = (GLfloat) obj->Image[0][b]->Width; \ + const GLfloat theight = (GLfloat) obj->Image[0][b]->Height; \ + const GLint twidth_log2 = obj->Image[0][b]->WidthLog2; \ + const GLchan *texture = (const GLchan *) obj->Image[0][b]->Data; \ + const GLint smask = obj->Image[0][b]->Width - 1; \ + const GLint tmask = obj->Image[0][b]->Height - 1; \ + if (!rb || !texture) { \ + return; \ + } + +#define RENDER_SPAN( span ) \ + GLuint i; \ + GLchan 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]; \ + rgb[i][GCOMP] = texture[pos+1]; \ + rgb[i][BCOMP] = texture[pos+2]; \ + 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[RCOMP]; \ + sample[GCOMP] = tex00[GCOMP]; \ + sample[BCOMP] = tex00[BCOMP]; \ + sample[ACOMP] = CHAN_MAX + +#define LINEAR_RGB \ + sample[RCOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0]);\ + sample[GCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\ + sample[BCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\ + sample[ACOMP] = CHAN_MAX; + +#define NEAREST_RGBA COPY_CHAN4(sample, tex00) + +#define LINEAR_RGBA \ + sample[RCOMP] = ilerp_2d(sf, tf, tex00[0], tex01[0], tex10[0], tex11[0]);\ + sample[GCOMP] = ilerp_2d(sf, tf, tex00[1], tex01[1], tex10[1], tex11[1]);\ + sample[BCOMP] = ilerp_2d(sf, tf, tex00[2], tex01[2], tex10[2], tex11[2]);\ + sample[ACOMP] = ilerp_2d(sf, tf, tex00[3], tex01[3], tex10[3], tex11[3]) + +#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 COPY_CHAN4(dest, tex00) + +#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 GL_RGB: + 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 GL_RGBA: + 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 GL_RGB: + 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 GL_RGBA: + 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; \ + struct gl_texture_object *obj = \ + ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \ + const GLint b = obj->BaseLevel; \ + const GLfloat twidth = (GLfloat) obj->Image[0][b]->Width; \ + const GLfloat theight = (GLfloat) obj->Image[0][b]->Height; \ + info.texture = (const GLchan *) obj->Image[0][b]->Data; \ + info.twidth_log2 = obj->Image[0][b]->WidthLog2; \ + info.smask = obj->Image[0][b]->Width - 1; \ + info.tmask = obj->Image[0][b]->Height - 1; \ + info.format = obj->Image[0][b]->_BaseFormat; \ + info.filter = obj->MinFilter; \ + info.envmode = unit->EnvMode; \ + 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 GL_ALPHA: \ + case GL_LUMINANCE: \ + case GL_INTENSITY: \ + info.tbytesline = obj->Image[0][b]->Width; \ + break; \ + case GL_LUMINANCE_ALPHA: \ + info.tbytesline = obj->Image[0][b]->Width * 2; \ + break; \ + case GL_RGB: \ + info.tbytesline = obj->Image[0][b]->Width * 3; \ + break; \ + case GL_RGBA: \ + info.tbytesline = obj->Image[0][b]->Width * 4; \ + break; \ + default: \ + _mesa_problem(NULL, "Bad texture format in affine_texture_triangle");\ + return; \ + } \ + info.tsize = obj->Image[0][b]->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 GL_RGB: + 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 GL_RGBA: + 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 GL_RGB: + 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 GL_RGBA: + 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; \ + struct gl_texture_object *obj = \ + ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; \ + const GLint b = obj->BaseLevel; \ + info.texture = (const GLchan *) obj->Image[0][b]->Data; \ + info.twidth_log2 = obj->Image[0][b]->WidthLog2; \ + info.smask = obj->Image[0][b]->Width - 1; \ + info.tmask = obj->Image[0][b]->Height - 1; \ + info.format = obj->Image[0][b]->_BaseFormat; \ + info.filter = obj->MinFilter; \ + info.envmode = unit->EnvMode; \ + \ + 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 GL_ALPHA: \ + case GL_LUMINANCE: \ + case GL_INTENSITY: \ + info.tbytesline = obj->Image[0][b]->Width; \ + break; \ + case GL_LUMINANCE_ALPHA: \ + info.tbytesline = obj->Image[0][b]->Width * 2; \ + break; \ + case GL_RGB: \ + info.tbytesline = obj->Image[0][b]->Width * 3; \ + break; \ + case GL_RGBA: \ + info.tbytesline = obj->Image[0][b]->Width * 4; \ + break; \ + default: \ + _mesa_problem(NULL, "Bad texture format in persp_textured_triangle");\ + return; \ + } \ + info.tsize = obj->Image[0][b]->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->DepthBits <= 16) { \ + 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); + const GLboolean rgbmode = ctx->Visual.rgbMode; + + 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 ((rgbmode && + ctx->Color.ColorMask[0] == 0 && + ctx->Color.ColorMask[1] == 0 && + ctx->Color.ColorMask[2] == 0 && + ctx->Color.ColorMask[3] == 0) + || + (!rgbmode && ctx->Color.IndexMask == 0)) { + USE(occlusion_zless_triangle); + return; + } + } + + if (!rgbmode) { + USE(ci_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; + GLint format; + texObj2D = ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; + + texImg = texObj2D ? texObj2D->Image[0][texObj2D->BaseLevel] : NULL; + format = texImg ? texImg->TexFormat->MesaFormat : -1; + minFilter = texObj2D ? texObj2D->MinFilter : (GLenum) 0; + magFilter = texObj2D ? texObj2D->MagFilter : (GLenum) 0; + 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.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_RGB || format == MESA_FORMAT_RGBA) + && 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_RGB + && (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 + 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); + } +} |