From e48f0b09abe42aa3393a492af07e53b76ad0ff3c Mon Sep 17 00:00:00 2001 From: Brian Date: Wed, 24 Oct 2007 11:37:05 -0600 Subject: Implement gl_PointCoord attribute for GLSL fragment shaders. Contains the normalized fragment position within a point sprite. --- src/mesa/swrast/s_fog.c | 1 - src/mesa/swrast/s_fragprog.c | 1 + src/mesa/swrast/s_points.c | 117 +++++++++++++++++++++++++------------------ src/mesa/swrast/s_span.c | 2 +- 4 files changed, 69 insertions(+), 52 deletions(-) (limited to 'src/mesa/swrast') diff --git a/src/mesa/swrast/s_fog.c b/src/mesa/swrast/s_fog.c index ed47964a66..7b143f6e5b 100644 --- a/src/mesa/swrast/s_fog.c +++ b/src/mesa/swrast/s_fog.c @@ -168,7 +168,6 @@ _swrast_fog_rgba_span( const GLcontext *ctx, SWspan *span ) GLfloat rFog, gFog, bFog; ASSERT(swrast->_FogEnabled); - ASSERT(swrast->_ActiveAttribMask & FRAG_BIT_FOGC); ASSERT(span->arrayMask & SPAN_RGBA); /* compute (scaled) fog color */ diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c index 14c9868c18..6656ebc0d0 100644 --- a/src/mesa/swrast/s_fragprog.c +++ b/src/mesa/swrast/s_fragprog.c @@ -113,6 +113,7 @@ init_machine(GLcontext *ctx, struct gl_program_machine *machine, machine->DerivY = (GLfloat (*)[4]) span->attrStepY; machine->NumDeriv = FRAG_ATTRIB_MAX; + /* if running a GLSL program (not ARB_fragment_program) */ if (ctx->Shader.CurrentProgram) { /* Store front/back facing value in register FOGC.Y */ machine->Attribs[FRAG_ATTRIB_FOGC][col][1] = (GLfloat) ctx->_Facing; diff --git a/src/mesa/swrast/s_points.c b/src/mesa/swrast/s_points.c index d54adc8fd1..ce73365a4e 100644 --- a/src/mesa/swrast/s_points.c +++ b/src/mesa/swrast/s_points.c @@ -55,7 +55,7 @@ sprite_point(GLcontext *ctx, const SWvertex *vert) SWcontext *swrast = SWRAST_CONTEXT(ctx); SWspan span; GLfloat size; - GLuint tCoords[MAX_TEXTURE_COORD_UNITS]; + GLuint tCoords[MAX_TEXTURE_COORD_UNITS + 1]; GLuint numTcoords = 0; GLfloat t0, dtdy; @@ -99,57 +99,71 @@ sprite_point(GLcontext *ctx, const SWvertex *vert) span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F; span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F; - ATTRIB_LOOP_BEGIN - if (attr >= FRAG_ATTRIB_TEX0 && attr < FRAG_ATTRIB_VAR0) { - const GLuint u = attr - FRAG_ATTRIB_TEX0; - /* a texcoord */ - if (ctx->Point.CoordReplace[u]) { - GLfloat s, r, dsdx; - - s = 0.0; - dsdx = 1.0 / size; - - if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT) { - t0 = 0.0; - dtdy = 1.0 / size; - } - else { - /* GL_UPPER_LEFT */ - t0 = 1.0; - dtdy = -1.0 / size; - } - 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; + { + GLfloat s, r, dsdx; + + /* texcoord / pointcoord interpolants */ + s = 0.0; + dsdx = 1.0 / size; + if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT) { + t0 = 0.0; + dtdy = 1.0 / size; + } + else { + /* GL_UPPER_LEFT */ + t0 = 1.0; + dtdy = -1.0 / size; + } + ATTRIB_LOOP_BEGIN + if (attr >= FRAG_ATTRIB_TEX0 && attr < FRAG_ATTRIB_VAR0) { + const GLuint u = attr - FRAG_ATTRIB_TEX0; + /* a texcoord */ + 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_FOGC) { + /* GLSL gl_PointCoord is stored in fog.zw */ + span.attrStart[FRAG_ATTRIB_FOGC][2] = 0.0; + span.attrStart[FRAG_ATTRIB_FOGC][3] = 0.0; /* t0 set below */ + span.attrStepX[FRAG_ATTRIB_FOGC][2] = dsdx; + span.attrStepX[FRAG_ATTRIB_FOGC][3] = 0.0; + span.attrStepY[FRAG_ATTRIB_FOGC][2] = 0.0; + span.attrStepY[FRAG_ATTRIB_FOGC][3] = dtdy; + tCoords[numTcoords++] = FRAG_ATTRIB_FOGC; 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 + /* 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 */ { @@ -184,7 +198,10 @@ sprite_point(GLcontext *ctx, const SWvertex *vert) GLuint i; /* setup texcoord T for this row */ for (i = 0; i < numTcoords; i++) { - span.attrStart[tCoords[i]][1] = tcoord; + if (tCoords[i] == FRAG_ATTRIB_FOGC) + span.attrStart[FRAG_ATTRIB_FOGC][3] = tcoord; + else + span.attrStart[tCoords[i]][1] = tcoord; } /* these might get changed by span clipping */ diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c index f1e58bd3d8..000e192a4a 100644 --- a/src/mesa/swrast/s_span.c +++ b/src/mesa/swrast/s_span.c @@ -1183,7 +1183,7 @@ shade_texture_span(GLcontext *ctx, SWspan *span) if (span->primitive == GL_BITMAP && span->array->ChanType != GL_FLOAT) { convert_color_type(span, GL_FLOAT, 0); } - if (span->primitive != GL_POINT) { + if (span->primitive != GL_POINT || ctx->Point.PointSprite) { /* for points, we populated the arrays already */ interpolate_active_attribs(ctx, span, ~0); } -- cgit v1.2.3