diff options
Diffstat (limited to 'mesalib/src/mesa/swrast/s_points.c')
| -rw-r--r-- | mesalib/src/mesa/swrast/s_points.c | 1144 |
1 files changed, 572 insertions, 572 deletions
diff --git a/mesalib/src/mesa/swrast/s_points.c b/mesalib/src/mesa/swrast/s_points.c index a46be8f58..11b7ef7b1 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 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;
- }
-}
+/* + * 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; + } +} |