From 807c6931fe683fd844ceec1b023232181e6aae03 Mon Sep 17 00:00:00 2001 From: marha Date: Tue, 28 Dec 2010 16:10:20 +0000 Subject: xserver and mesa git update 28-12-2010 --- mesalib/src/mesa/swrast/s_points.c | 1144 ++++++++++++++++++------------------ 1 file changed, 572 insertions(+), 572 deletions(-) (limited to 'mesalib/src/mesa/swrast/s_points.c') diff --git a/mesalib/src/mesa/swrast/s_points.c b/mesalib/src/mesa/swrast/s_points.c index 12431662c..a46be8f58 100644 --- a/mesalib/src/mesa/swrast/s_points.c +++ b/mesalib/src/mesa/swrast/s_points.c @@ -1,572 +1,572 @@ -/* - * Mesa 3-D graphics library - * Version: 7.1 - * - * 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. - */ - - -#include "main/glheader.h" -#include "main/colormac.h" -#include "main/macros.h" -#include "s_context.h" -#include "s_feedback.h" -#include "s_points.h" -#include "s_span.h" - - -/** - * Used to cull points with invalid coords - */ -#define CULL_INVALID(V) \ - do { \ - float tmp = (V)->attrib[FRAG_ATTRIB_WPOS][0] \ - + (V)->attrib[FRAG_ATTRIB_WPOS][1]; \ - if (IS_INF_OR_NAN(tmp)) \ - return; \ - } while(0) - - - -/** - * Get/compute the point size. - * The size may come from a vertex shader, or computed with attentuation - * or just the glPointSize value. - * Must also clamp to user-defined range and implmentation limits. - */ -static INLINE GLfloat -get_size(const GLcontext *ctx, const SWvertex *vert, GLboolean smoothed) -{ - GLfloat size; - - if (ctx->Point._Attenuated || ctx->VertexProgram.PointSizeEnabled) { - /* use vertex's point size */ - size = vert->pointSize; - } - else { - /* use constant point size */ - size = ctx->Point.Size; - } - /* always clamp to user-specified limits */ - size = CLAMP(size, ctx->Point.MinSize, ctx->Point.MaxSize); - /* clamp to implementation limits */ - if (smoothed) - size = CLAMP(size, ctx->Const.MinPointSizeAA, ctx->Const.MaxPointSizeAA); - else - size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize); - - return size; -} - - -/** - * Draw a point sprite - */ -static void -sprite_point(GLcontext *ctx, const SWvertex *vert) -{ - SWcontext *swrast = SWRAST_CONTEXT(ctx); - SWspan span; - GLfloat size; - GLuint tCoords[MAX_TEXTURE_COORD_UNITS + 1]; - GLuint numTcoords = 0; - GLfloat t0, dtdy; - - CULL_INVALID(vert); - - /* z coord */ - if (ctx->DrawBuffer->Visual.depthBits <= 16) - span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); - else - span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); - span.zStep = 0; - - size = get_size(ctx, vert, GL_FALSE); - - /* span init */ - INIT_SPAN(span, GL_POINT); - span.interpMask = SPAN_Z | SPAN_RGBA; - - span.facing = swrast->PointLineFacing; - - span.red = ChanToFixed(vert->color[0]); - span.green = ChanToFixed(vert->color[1]); - span.blue = ChanToFixed(vert->color[2]); - span.alpha = ChanToFixed(vert->color[3]); - span.redStep = 0; - span.greenStep = 0; - span.blueStep = 0; - span.alphaStep = 0; - - /* need these for fragment programs */ - span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F; - span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; - span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; - - { - GLfloat s, r, dsdx; - - /* texcoord / pointcoord interpolants */ - s = 0.0F; - dsdx = 1.0F / size; - if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT) { - dtdy = 1.0F / size; - t0 = 0.5F * dtdy; - } - else { - /* GL_UPPER_LEFT */ - dtdy = -1.0F / size; - t0 = 1.0F + 0.5F * dtdy; - } - - ATTRIB_LOOP_BEGIN - if (attr >= FRAG_ATTRIB_TEX0 && attr <= FRAG_ATTRIB_TEX7) { - /* a texcoord attribute */ - const GLuint u = attr - FRAG_ATTRIB_TEX0; - ASSERT(u < Elements(ctx->Point.CoordReplace)); - if (ctx->Point.CoordReplace[u]) { - tCoords[numTcoords++] = attr; - - if (ctx->Point.SpriteRMode == GL_ZERO) - r = 0.0F; - else if (ctx->Point.SpriteRMode == GL_S) - r = vert->attrib[attr][0]; - else /* GL_R */ - r = vert->attrib[attr][2]; - - span.attrStart[attr][0] = s; - span.attrStart[attr][1] = 0.0; /* overwritten below */ - span.attrStart[attr][2] = r; - span.attrStart[attr][3] = 1.0; - - span.attrStepX[attr][0] = dsdx; - span.attrStepX[attr][1] = 0.0; - span.attrStepX[attr][2] = 0.0; - span.attrStepX[attr][3] = 0.0; - - span.attrStepY[attr][0] = 0.0; - span.attrStepY[attr][1] = dtdy; - span.attrStepY[attr][2] = 0.0; - span.attrStepY[attr][3] = 0.0; - - continue; - } - } - else if (attr == FRAG_ATTRIB_PNTC) { - /* GLSL gl_PointCoord.xy (.zw undefined) */ - span.attrStart[FRAG_ATTRIB_PNTC][0] = 0.0; - span.attrStart[FRAG_ATTRIB_PNTC][1] = 0.0; /* t0 set below */ - span.attrStepX[FRAG_ATTRIB_PNTC][0] = dsdx; - span.attrStepX[FRAG_ATTRIB_PNTC][1] = 0.0; - span.attrStepY[FRAG_ATTRIB_PNTC][0] = 0.0; - span.attrStepY[FRAG_ATTRIB_PNTC][1] = dtdy; - tCoords[numTcoords++] = FRAG_ATTRIB_PNTC; - continue; - } - /* use vertex's texcoord/attrib */ - COPY_4V(span.attrStart[attr], vert->attrib[attr]); - ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0); - ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0); - ATTRIB_LOOP_END; - } - - /* compute pos, bounds and render */ - { - const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0]; - const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1]; - GLint iSize = (GLint) (size + 0.5F); - GLint xmin, xmax, ymin, ymax, iy; - GLint iRadius; - GLfloat tcoord = t0; - - iSize = MAX2(1, iSize); - iRadius = iSize / 2; - - if (iSize & 1) { - /* odd size */ - xmin = (GLint) (x - iRadius); - xmax = (GLint) (x + iRadius); - ymin = (GLint) (y - iRadius); - ymax = (GLint) (y + iRadius); - } - else { - /* even size */ - /* 0.501 factor allows conformance to pass */ - xmin = (GLint) (x + 0.501) - iRadius; - xmax = xmin + iSize - 1; - ymin = (GLint) (y + 0.501) - iRadius; - ymax = ymin + iSize - 1; - } - - /* render spans */ - for (iy = ymin; iy <= ymax; iy++) { - GLuint i; - /* setup texcoord T for this row */ - for (i = 0; i < numTcoords; i++) { - span.attrStart[tCoords[i]][1] = tcoord; - } - - /* these might get changed by span clipping */ - span.x = xmin; - span.y = iy; - span.end = xmax - xmin + 1; - - _swrast_write_rgba_span(ctx, &span); - - tcoord += dtdy; - } - } -} - - -/** - * Draw smooth/antialiased point. RGB or CI mode. - */ -static void -smooth_point(GLcontext *ctx, const SWvertex *vert) -{ - SWcontext *swrast = SWRAST_CONTEXT(ctx); - SWspan span; - GLfloat size, alphaAtten; - - CULL_INVALID(vert); - - /* z coord */ - if (ctx->DrawBuffer->Visual.depthBits <= 16) - span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); - else - span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); - span.zStep = 0; - - size = get_size(ctx, vert, GL_TRUE); - - /* alpha attenuation / fade factor */ - if (ctx->Multisample._Enabled) { - if (vert->pointSize >= ctx->Point.Threshold) { - alphaAtten = 1.0F; - } - else { - GLfloat dsize = vert->pointSize / ctx->Point.Threshold; - alphaAtten = dsize * dsize; - } - } - else { - alphaAtten = 1.0; - } - (void) alphaAtten; /* not used */ - - /* span init */ - INIT_SPAN(span, GL_POINT); - span.interpMask = SPAN_Z | SPAN_RGBA; - span.arrayMask = SPAN_COVERAGE | SPAN_MASK; - - span.facing = swrast->PointLineFacing; - - span.red = ChanToFixed(vert->color[0]); - span.green = ChanToFixed(vert->color[1]); - span.blue = ChanToFixed(vert->color[2]); - span.alpha = ChanToFixed(vert->color[3]); - span.redStep = 0; - span.greenStep = 0; - span.blueStep = 0; - span.alphaStep = 0; - - /* need these for fragment programs */ - span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F; - span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; - span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; - - ATTRIB_LOOP_BEGIN - COPY_4V(span.attrStart[attr], vert->attrib[attr]); - ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0); - ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0); - ATTRIB_LOOP_END - - /* compute pos, bounds and render */ - { - const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0]; - const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1]; - const GLfloat radius = 0.5F * size; - const GLfloat rmin = radius - 0.7071F; /* 0.7071 = sqrt(2)/2 */ - const GLfloat rmax = radius + 0.7071F; - const GLfloat rmin2 = MAX2(0.0F, rmin * rmin); - const GLfloat rmax2 = rmax * rmax; - const GLfloat cscale = 1.0F / (rmax2 - rmin2); - const GLint xmin = (GLint) (x - radius); - const GLint xmax = (GLint) (x + radius); - const GLint ymin = (GLint) (y - radius); - const GLint ymax = (GLint) (y + radius); - GLint ix, iy; - - for (iy = ymin; iy <= ymax; iy++) { - - /* these might get changed by span clipping */ - span.x = xmin; - span.y = iy; - span.end = xmax - xmin + 1; - - /* compute coverage for each pixel in span */ - for (ix = xmin; ix <= xmax; ix++) { - const GLfloat dx = ix - x + 0.5F; - const GLfloat dy = iy - y + 0.5F; - const GLfloat dist2 = dx * dx + dy * dy; - GLfloat coverage; - - if (dist2 < rmax2) { - if (dist2 >= rmin2) { - /* compute partial coverage */ - coverage = 1.0F - (dist2 - rmin2) * cscale; - } - else { - /* full coverage */ - coverage = 1.0F; - } - span.array->mask[ix - xmin] = 1; - } - else { - /* zero coverage - fragment outside the radius */ - coverage = 0.0; - span.array->mask[ix - xmin] = 0; - } - span.array->coverage[ix - xmin] = coverage; - } - - /* render span */ - _swrast_write_rgba_span(ctx, &span); - - } - } -} - - -/** - * Draw large (size >= 1) non-AA point. RGB or CI mode. - */ -static void -large_point(GLcontext *ctx, const SWvertex *vert) -{ - SWcontext *swrast = SWRAST_CONTEXT(ctx); - SWspan span; - GLfloat size; - - CULL_INVALID(vert); - - /* z coord */ - if (ctx->DrawBuffer->Visual.depthBits <= 16) - span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); - else - span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); - span.zStep = 0; - - size = get_size(ctx, vert, GL_FALSE); - - /* span init */ - INIT_SPAN(span, GL_POINT); - span.arrayMask = SPAN_XY; - span.facing = swrast->PointLineFacing; - - span.interpMask = SPAN_Z | SPAN_RGBA; - span.red = ChanToFixed(vert->color[0]); - span.green = ChanToFixed(vert->color[1]); - span.blue = ChanToFixed(vert->color[2]); - span.alpha = ChanToFixed(vert->color[3]); - span.redStep = 0; - span.greenStep = 0; - span.blueStep = 0; - span.alphaStep = 0; - - /* need these for fragment programs */ - span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F; - span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; - span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; - - ATTRIB_LOOP_BEGIN - COPY_4V(span.attrStart[attr], vert->attrib[attr]); - ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0); - ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0); - ATTRIB_LOOP_END - - /* compute pos, bounds and render */ - { - const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0]; - const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1]; - GLint iSize = (GLint) (size + 0.5F); - GLint xmin, xmax, ymin, ymax, ix, iy; - GLint iRadius; - - iSize = MAX2(1, iSize); - iRadius = iSize / 2; - - if (iSize & 1) { - /* odd size */ - xmin = (GLint) (x - iRadius); - xmax = (GLint) (x + iRadius); - ymin = (GLint) (y - iRadius); - ymax = (GLint) (y + iRadius); - } - else { - /* even size */ - /* 0.501 factor allows conformance to pass */ - xmin = (GLint) (x + 0.501) - iRadius; - xmax = xmin + iSize - 1; - ymin = (GLint) (y + 0.501) - iRadius; - ymax = ymin + iSize - 1; - } - - /* generate fragments */ - span.end = 0; - for (iy = ymin; iy <= ymax; iy++) { - for (ix = xmin; ix <= xmax; ix++) { - span.array->x[span.end] = ix; - span.array->y[span.end] = iy; - span.end++; - } - } - assert(span.end <= MAX_WIDTH); - _swrast_write_rgba_span(ctx, &span); - } -} - - -/** - * Draw size=1, single-pixel point - */ -static void -pixel_point(GLcontext *ctx, const SWvertex *vert) -{ - SWcontext *swrast = SWRAST_CONTEXT(ctx); - /* - * Note that unlike the other functions, we put single-pixel points - * into a special span array in order to render as many points as - * possible with a single _swrast_write_rgba_span() call. - */ - SWspan *span = &(swrast->PointSpan); - GLuint count; - - CULL_INVALID(vert); - - /* Span init */ - span->interpMask = 0; - span->arrayMask = SPAN_XY | SPAN_Z; - span->arrayMask |= SPAN_RGBA; - /*span->arrayMask |= SPAN_LAMBDA;*/ - span->arrayAttribs = swrast->_ActiveAttribMask; /* we'll produce these vals */ - - /* need these for fragment programs */ - span->attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F; - span->attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; - span->attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; - - /* check if we need to flush */ - if (span->end >= MAX_WIDTH || - (swrast->_RasterMask & (BLEND_BIT | LOGIC_OP_BIT | MASKING_BIT)) || - span->facing != swrast->PointLineFacing) { - if (span->end > 0) { - _swrast_write_rgba_span(ctx, span); - span->end = 0; - } - } - - count = span->end; - - span->facing = swrast->PointLineFacing; - - /* fragment attributes */ - span->array->rgba[count][RCOMP] = vert->color[0]; - span->array->rgba[count][GCOMP] = vert->color[1]; - span->array->rgba[count][BCOMP] = vert->color[2]; - span->array->rgba[count][ACOMP] = vert->color[3]; - - ATTRIB_LOOP_BEGIN - COPY_4V(span->array->attribs[attr][count], vert->attrib[attr]); - ATTRIB_LOOP_END - - /* fragment position */ - span->array->x[count] = (GLint) vert->attrib[FRAG_ATTRIB_WPOS][0]; - span->array->y[count] = (GLint) vert->attrib[FRAG_ATTRIB_WPOS][1]; - span->array->z[count] = (GLint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); - - span->end = count + 1; - ASSERT(span->end <= MAX_WIDTH); -} - - -/** - * Add specular color to primary color, draw point, restore original - * primary color. - */ -void -_swrast_add_spec_terms_point(GLcontext *ctx, const SWvertex *v0) -{ - SWvertex *ncv0 = (SWvertex *) v0; /* cast away const */ - GLfloat rSum, gSum, bSum; - GLchan cSave[4]; - - /* save */ - COPY_CHAN4(cSave, ncv0->color); - /* sum */ - 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); - /* draw */ - SWRAST_CONTEXT(ctx)->SpecPoint(ctx, ncv0); - /* restore */ - COPY_CHAN4(ncv0->color, cSave); -} - - -/** - * Examine current state to determine which point drawing function to use. - */ -void -_swrast_choose_point(GLcontext *ctx) -{ - SWcontext *swrast = SWRAST_CONTEXT(ctx); - const GLfloat size = CLAMP(ctx->Point.Size, - ctx->Point.MinSize, - ctx->Point.MaxSize); - - if (ctx->RenderMode == GL_RENDER) { - if (ctx->Point.PointSprite) { - swrast->Point = sprite_point; - } - else if (ctx->Point.SmoothFlag) { - swrast->Point = smooth_point; - } - else if (size > 1.0 || - ctx->Point._Attenuated || - ctx->VertexProgram.PointSizeEnabled) { - swrast->Point = large_point; - } - else { - swrast->Point = pixel_point; - } - } - else if (ctx->RenderMode == GL_FEEDBACK) { - swrast->Point = _swrast_feedback_point; - } - else { - /* GL_SELECT mode */ - swrast->Point = _swrast_select_point; - } -} +/* + * Mesa 3-D graphics library + * Version: 7.1 + * + * 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. + */ + + +#include "main/glheader.h" +#include "main/colormac.h" +#include "main/macros.h" +#include "s_context.h" +#include "s_feedback.h" +#include "s_points.h" +#include "s_span.h" + + +/** + * Used to cull points with invalid coords + */ +#define CULL_INVALID(V) \ + do { \ + float tmp = (V)->attrib[FRAG_ATTRIB_WPOS][0] \ + + (V)->attrib[FRAG_ATTRIB_WPOS][1]; \ + if (IS_INF_OR_NAN(tmp)) \ + return; \ + } while(0) + + + +/** + * Get/compute the point size. + * The size may come from a vertex shader, or computed with attentuation + * or just the glPointSize value. + * Must also clamp to user-defined range and implmentation limits. + */ +static INLINE GLfloat +get_size(const struct gl_context *ctx, const SWvertex *vert, GLboolean smoothed) +{ + GLfloat size; + + if (ctx->Point._Attenuated || ctx->VertexProgram.PointSizeEnabled) { + /* use vertex's point size */ + size = vert->pointSize; + } + else { + /* use constant point size */ + size = ctx->Point.Size; + } + /* always clamp to user-specified limits */ + size = CLAMP(size, ctx->Point.MinSize, ctx->Point.MaxSize); + /* clamp to implementation limits */ + if (smoothed) + size = CLAMP(size, ctx->Const.MinPointSizeAA, ctx->Const.MaxPointSizeAA); + else + size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize); + + return size; +} + + +/** + * Draw a point sprite + */ +static void +sprite_point(struct gl_context *ctx, const SWvertex *vert) +{ + SWcontext *swrast = SWRAST_CONTEXT(ctx); + SWspan span; + GLfloat size; + GLuint tCoords[MAX_TEXTURE_COORD_UNITS + 1]; + GLuint numTcoords = 0; + GLfloat t0, dtdy; + + CULL_INVALID(vert); + + /* z coord */ + if (ctx->DrawBuffer->Visual.depthBits <= 16) + span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); + else + span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); + span.zStep = 0; + + size = get_size(ctx, vert, GL_FALSE); + + /* span init */ + INIT_SPAN(span, GL_POINT); + span.interpMask = SPAN_Z | SPAN_RGBA; + + span.facing = swrast->PointLineFacing; + + span.red = ChanToFixed(vert->color[0]); + span.green = ChanToFixed(vert->color[1]); + span.blue = ChanToFixed(vert->color[2]); + span.alpha = ChanToFixed(vert->color[3]); + span.redStep = 0; + span.greenStep = 0; + span.blueStep = 0; + span.alphaStep = 0; + + /* need these for fragment programs */ + span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F; + span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; + span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; + + { + GLfloat s, r, dsdx; + + /* texcoord / pointcoord interpolants */ + s = 0.0F; + dsdx = 1.0F / size; + if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT) { + dtdy = 1.0F / size; + t0 = 0.5F * dtdy; + } + else { + /* GL_UPPER_LEFT */ + dtdy = -1.0F / size; + t0 = 1.0F + 0.5F * dtdy; + } + + ATTRIB_LOOP_BEGIN + if (attr >= FRAG_ATTRIB_TEX0 && attr <= FRAG_ATTRIB_TEX7) { + /* a texcoord attribute */ + const GLuint u = attr - FRAG_ATTRIB_TEX0; + ASSERT(u < Elements(ctx->Point.CoordReplace)); + if (ctx->Point.CoordReplace[u]) { + tCoords[numTcoords++] = attr; + + if (ctx->Point.SpriteRMode == GL_ZERO) + r = 0.0F; + else if (ctx->Point.SpriteRMode == GL_S) + r = vert->attrib[attr][0]; + else /* GL_R */ + r = vert->attrib[attr][2]; + + span.attrStart[attr][0] = s; + span.attrStart[attr][1] = 0.0; /* overwritten below */ + span.attrStart[attr][2] = r; + span.attrStart[attr][3] = 1.0; + + span.attrStepX[attr][0] = dsdx; + span.attrStepX[attr][1] = 0.0; + span.attrStepX[attr][2] = 0.0; + span.attrStepX[attr][3] = 0.0; + + span.attrStepY[attr][0] = 0.0; + span.attrStepY[attr][1] = dtdy; + span.attrStepY[attr][2] = 0.0; + span.attrStepY[attr][3] = 0.0; + + continue; + } + } + else if (attr == FRAG_ATTRIB_PNTC) { + /* GLSL gl_PointCoord.xy (.zw undefined) */ + span.attrStart[FRAG_ATTRIB_PNTC][0] = 0.0; + span.attrStart[FRAG_ATTRIB_PNTC][1] = 0.0; /* t0 set below */ + span.attrStepX[FRAG_ATTRIB_PNTC][0] = dsdx; + span.attrStepX[FRAG_ATTRIB_PNTC][1] = 0.0; + span.attrStepY[FRAG_ATTRIB_PNTC][0] = 0.0; + span.attrStepY[FRAG_ATTRIB_PNTC][1] = dtdy; + tCoords[numTcoords++] = FRAG_ATTRIB_PNTC; + continue; + } + /* use vertex's texcoord/attrib */ + COPY_4V(span.attrStart[attr], vert->attrib[attr]); + ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0); + ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0); + ATTRIB_LOOP_END; + } + + /* compute pos, bounds and render */ + { + const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0]; + const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1]; + GLint iSize = (GLint) (size + 0.5F); + GLint xmin, xmax, ymin, ymax, iy; + GLint iRadius; + GLfloat tcoord = t0; + + iSize = MAX2(1, iSize); + iRadius = iSize / 2; + + if (iSize & 1) { + /* odd size */ + xmin = (GLint) (x - iRadius); + xmax = (GLint) (x + iRadius); + ymin = (GLint) (y - iRadius); + ymax = (GLint) (y + iRadius); + } + else { + /* even size */ + /* 0.501 factor allows conformance to pass */ + xmin = (GLint) (x + 0.501) - iRadius; + xmax = xmin + iSize - 1; + ymin = (GLint) (y + 0.501) - iRadius; + ymax = ymin + iSize - 1; + } + + /* render spans */ + for (iy = ymin; iy <= ymax; iy++) { + GLuint i; + /* setup texcoord T for this row */ + for (i = 0; i < numTcoords; i++) { + span.attrStart[tCoords[i]][1] = tcoord; + } + + /* these might get changed by span clipping */ + span.x = xmin; + span.y = iy; + span.end = xmax - xmin + 1; + + _swrast_write_rgba_span(ctx, &span); + + tcoord += dtdy; + } + } +} + + +/** + * Draw smooth/antialiased point. RGB or CI mode. + */ +static void +smooth_point(struct gl_context *ctx, const SWvertex *vert) +{ + SWcontext *swrast = SWRAST_CONTEXT(ctx); + SWspan span; + GLfloat size, alphaAtten; + + CULL_INVALID(vert); + + /* z coord */ + if (ctx->DrawBuffer->Visual.depthBits <= 16) + span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); + else + span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); + span.zStep = 0; + + size = get_size(ctx, vert, GL_TRUE); + + /* alpha attenuation / fade factor */ + if (ctx->Multisample._Enabled) { + if (vert->pointSize >= ctx->Point.Threshold) { + alphaAtten = 1.0F; + } + else { + GLfloat dsize = vert->pointSize / ctx->Point.Threshold; + alphaAtten = dsize * dsize; + } + } + else { + alphaAtten = 1.0; + } + (void) alphaAtten; /* not used */ + + /* span init */ + INIT_SPAN(span, GL_POINT); + span.interpMask = SPAN_Z | SPAN_RGBA; + span.arrayMask = SPAN_COVERAGE | SPAN_MASK; + + span.facing = swrast->PointLineFacing; + + span.red = ChanToFixed(vert->color[0]); + span.green = ChanToFixed(vert->color[1]); + span.blue = ChanToFixed(vert->color[2]); + span.alpha = ChanToFixed(vert->color[3]); + span.redStep = 0; + span.greenStep = 0; + span.blueStep = 0; + span.alphaStep = 0; + + /* need these for fragment programs */ + span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F; + span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; + span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; + + ATTRIB_LOOP_BEGIN + COPY_4V(span.attrStart[attr], vert->attrib[attr]); + ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0); + ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0); + ATTRIB_LOOP_END + + /* compute pos, bounds and render */ + { + const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0]; + const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1]; + const GLfloat radius = 0.5F * size; + const GLfloat rmin = radius - 0.7071F; /* 0.7071 = sqrt(2)/2 */ + const GLfloat rmax = radius + 0.7071F; + const GLfloat rmin2 = MAX2(0.0F, rmin * rmin); + const GLfloat rmax2 = rmax * rmax; + const GLfloat cscale = 1.0F / (rmax2 - rmin2); + const GLint xmin = (GLint) (x - radius); + const GLint xmax = (GLint) (x + radius); + const GLint ymin = (GLint) (y - radius); + const GLint ymax = (GLint) (y + radius); + GLint ix, iy; + + for (iy = ymin; iy <= ymax; iy++) { + + /* these might get changed by span clipping */ + span.x = xmin; + span.y = iy; + span.end = xmax - xmin + 1; + + /* compute coverage for each pixel in span */ + for (ix = xmin; ix <= xmax; ix++) { + const GLfloat dx = ix - x + 0.5F; + const GLfloat dy = iy - y + 0.5F; + const GLfloat dist2 = dx * dx + dy * dy; + GLfloat coverage; + + if (dist2 < rmax2) { + if (dist2 >= rmin2) { + /* compute partial coverage */ + coverage = 1.0F - (dist2 - rmin2) * cscale; + } + else { + /* full coverage */ + coverage = 1.0F; + } + span.array->mask[ix - xmin] = 1; + } + else { + /* zero coverage - fragment outside the radius */ + coverage = 0.0; + span.array->mask[ix - xmin] = 0; + } + span.array->coverage[ix - xmin] = coverage; + } + + /* render span */ + _swrast_write_rgba_span(ctx, &span); + + } + } +} + + +/** + * Draw large (size >= 1) non-AA point. RGB or CI mode. + */ +static void +large_point(struct gl_context *ctx, const SWvertex *vert) +{ + SWcontext *swrast = SWRAST_CONTEXT(ctx); + SWspan span; + GLfloat size; + + CULL_INVALID(vert); + + /* z coord */ + if (ctx->DrawBuffer->Visual.depthBits <= 16) + span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); + else + span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); + span.zStep = 0; + + size = get_size(ctx, vert, GL_FALSE); + + /* span init */ + INIT_SPAN(span, GL_POINT); + span.arrayMask = SPAN_XY; + span.facing = swrast->PointLineFacing; + + span.interpMask = SPAN_Z | SPAN_RGBA; + span.red = ChanToFixed(vert->color[0]); + span.green = ChanToFixed(vert->color[1]); + span.blue = ChanToFixed(vert->color[2]); + span.alpha = ChanToFixed(vert->color[3]); + span.redStep = 0; + span.greenStep = 0; + span.blueStep = 0; + span.alphaStep = 0; + + /* need these for fragment programs */ + span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F; + span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; + span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; + + ATTRIB_LOOP_BEGIN + COPY_4V(span.attrStart[attr], vert->attrib[attr]); + ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0); + ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0); + ATTRIB_LOOP_END + + /* compute pos, bounds and render */ + { + const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0]; + const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1]; + GLint iSize = (GLint) (size + 0.5F); + GLint xmin, xmax, ymin, ymax, ix, iy; + GLint iRadius; + + iSize = MAX2(1, iSize); + iRadius = iSize / 2; + + if (iSize & 1) { + /* odd size */ + xmin = (GLint) (x - iRadius); + xmax = (GLint) (x + iRadius); + ymin = (GLint) (y - iRadius); + ymax = (GLint) (y + iRadius); + } + else { + /* even size */ + /* 0.501 factor allows conformance to pass */ + xmin = (GLint) (x + 0.501) - iRadius; + xmax = xmin + iSize - 1; + ymin = (GLint) (y + 0.501) - iRadius; + ymax = ymin + iSize - 1; + } + + /* generate fragments */ + span.end = 0; + for (iy = ymin; iy <= ymax; iy++) { + for (ix = xmin; ix <= xmax; ix++) { + span.array->x[span.end] = ix; + span.array->y[span.end] = iy; + span.end++; + } + } + assert(span.end <= MAX_WIDTH); + _swrast_write_rgba_span(ctx, &span); + } +} + + +/** + * Draw size=1, single-pixel point + */ +static void +pixel_point(struct gl_context *ctx, const SWvertex *vert) +{ + SWcontext *swrast = SWRAST_CONTEXT(ctx); + /* + * Note that unlike the other functions, we put single-pixel points + * into a special span array in order to render as many points as + * possible with a single _swrast_write_rgba_span() call. + */ + SWspan *span = &(swrast->PointSpan); + GLuint count; + + CULL_INVALID(vert); + + /* Span init */ + span->interpMask = 0; + span->arrayMask = SPAN_XY | SPAN_Z; + span->arrayMask |= SPAN_RGBA; + /*span->arrayMask |= SPAN_LAMBDA;*/ + span->arrayAttribs = swrast->_ActiveAttribMask; /* we'll produce these vals */ + + /* need these for fragment programs */ + span->attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F; + span->attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; + span->attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; + + /* check if we need to flush */ + if (span->end >= MAX_WIDTH || + (swrast->_RasterMask & (BLEND_BIT | LOGIC_OP_BIT | MASKING_BIT)) || + span->facing != swrast->PointLineFacing) { + if (span->end > 0) { + _swrast_write_rgba_span(ctx, span); + span->end = 0; + } + } + + count = span->end; + + span->facing = swrast->PointLineFacing; + + /* fragment attributes */ + span->array->rgba[count][RCOMP] = vert->color[0]; + span->array->rgba[count][GCOMP] = vert->color[1]; + span->array->rgba[count][BCOMP] = vert->color[2]; + span->array->rgba[count][ACOMP] = vert->color[3]; + + ATTRIB_LOOP_BEGIN + COPY_4V(span->array->attribs[attr][count], vert->attrib[attr]); + ATTRIB_LOOP_END + + /* fragment position */ + span->array->x[count] = (GLint) vert->attrib[FRAG_ATTRIB_WPOS][0]; + span->array->y[count] = (GLint) vert->attrib[FRAG_ATTRIB_WPOS][1]; + span->array->z[count] = (GLint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F); + + span->end = count + 1; + ASSERT(span->end <= MAX_WIDTH); +} + + +/** + * Add specular color to primary color, draw point, restore original + * primary color. + */ +void +_swrast_add_spec_terms_point(struct gl_context *ctx, const SWvertex *v0) +{ + SWvertex *ncv0 = (SWvertex *) v0; /* cast away const */ + GLfloat rSum, gSum, bSum; + GLchan cSave[4]; + + /* save */ + COPY_CHAN4(cSave, ncv0->color); + /* sum */ + 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); + /* draw */ + SWRAST_CONTEXT(ctx)->SpecPoint(ctx, ncv0); + /* restore */ + COPY_CHAN4(ncv0->color, cSave); +} + + +/** + * Examine current state to determine which point drawing function to use. + */ +void +_swrast_choose_point(struct gl_context *ctx) +{ + SWcontext *swrast = SWRAST_CONTEXT(ctx); + const GLfloat size = CLAMP(ctx->Point.Size, + ctx->Point.MinSize, + ctx->Point.MaxSize); + + if (ctx->RenderMode == GL_RENDER) { + if (ctx->Point.PointSprite) { + swrast->Point = sprite_point; + } + else if (ctx->Point.SmoothFlag) { + swrast->Point = smooth_point; + } + else if (size > 1.0 || + ctx->Point._Attenuated || + ctx->VertexProgram.PointSizeEnabled) { + swrast->Point = large_point; + } + else { + swrast->Point = pixel_point; + } + } + else if (ctx->RenderMode == GL_FEEDBACK) { + swrast->Point = _swrast_feedback_point; + } + else { + /* GL_SELECT mode */ + swrast->Point = _swrast_select_point; + } +} -- cgit v1.2.3