diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/swrast/s_tritemp.h | 102 |
1 files changed, 38 insertions, 64 deletions
diff --git a/src/mesa/swrast/s_tritemp.h b/src/mesa/swrast/s_tritemp.h index 93454346bd5..d4c9fdd7cb9 100644 --- a/src/mesa/swrast/s_tritemp.h +++ b/src/mesa/swrast/s_tritemp.h @@ -141,6 +141,24 @@ #endif + +/* + * Some code we unfortunately need to prevent negative interpolated colors. + */ +#ifndef CLAMP_INTERPOLANT +#define CLAMP_INTERPOLANT(CHANNEL, CHANNELSTEP, LEN) \ +do { \ + GLfixed endVal = span.CHANNEL + (LEN) * span.CHANNELSTEP; \ + if (endVal < 0) { \ + span.CHANNEL -= endVal; \ + } \ + if (span.CHANNEL < 0) { \ + span.CHANNEL = 0; \ + } \ +} while (0) +#endif + + static void NAME(GLcontext *ctx, const SWvertex *v0, const SWvertex *v1, const SWvertex *v2 ) @@ -304,6 +322,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0, oneOverArea = 1.0F / area; } + span.facing = ctx->_Facing; /* for 2-sided stencil test */ /* Edge setup. For a triangle strip these could be reused... */ @@ -510,7 +529,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0, # endif /* INTERP_ALPHA */ } else { - ASSERT (ctx->Light.ShadeModel == GL_FLAT); + ASSERT(ctx->Light.ShadeModel == GL_FLAT); span.interpMask |= SPAN_FLAT; span.drdx = span.drdy = 0.0F; span.dgdx = span.dgdy = 0.0F; @@ -903,7 +922,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0, # endif } else { - ASSERT (ctx->Light.ShadeModel == GL_FLAT); + ASSERT(ctx->Light.ShadeModel == GL_FLAT); # if CHAN_TYPE == GL_FLOAT rLeft = v2->color[RCOMP]; gLeft = v2->color[GCOMP]; @@ -925,7 +944,8 @@ static void NAME(GLcontext *ctx, const SWvertex *v0, # endif # endif } -#endif +#endif /* INTERP_RGB */ + #ifdef INTERP_SPEC if (ctx->Light.ShadeModel == GL_SMOOTH) { @@ -946,6 +966,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0, # endif } else { + ASSERT(ctx->Light.ShadeModel == GL_FLAT); #if CHAN_TYPE == GL_FLOAT srLeft = v2->specular[RCOMP]; sgLeft = v2->specular[GCOMP]; @@ -967,6 +988,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0, diOuter = SignedFloatToFixed(didy + dxOuter * didx); } else { + ASSERT(ctx->Light.ShadeModel == GL_FLAT); iLeft = FloatToFixed(v2->index); diOuter = 0; } @@ -1114,77 +1136,29 @@ static void NAME(GLcontext *ctx, const SWvertex *v0, ) #endif - if (span.end > 1) { - /* Under rare circumstances, we might have to fudge the - * colors. XXX does this really happen anymore??? - */ + /* This is where we actually generate fragments */ + /* XXX the test for span.y > 0 _shouldn't_ be needed but + * it fixes a problem on 64-bit Opterons (bug 4842). + */ + if (span.end > 0 && span.y >= 0) { const GLint len = span.end - 1; (void) len; #ifdef INTERP_RGB - { - GLfixed ffrend = span.red + len * span.redStep; - GLfixed ffgend = span.green + len * span.greenStep; - GLfixed ffbend = span.blue + len * span.blueStep; - if (ffrend < 0) { - span.red -= ffrend; - if (span.red < 0) - span.red = 0; - } - if (ffgend < 0) { - span.green -= ffgend; - if (span.green < 0) - span.green = 0; - } - if (ffbend < 0) { - span.blue -= ffbend; - if (span.blue < 0) - span.blue = 0; - } - } + CLAMP_INTERPOLANT(red, redStep, len); + CLAMP_INTERPOLANT(green, greenStep, len); + CLAMP_INTERPOLANT(blue, blueStep, len); #endif #ifdef INTERP_ALPHA - { - GLfixed ffaend = span.alpha + len * span.alphaStep; - if (ffaend < 0) { - span.alpha -= ffaend; - if (span.alpha < 0) - span.alpha = 0; - } - } + CLAMP_INTERPOLANT(alpha, alphaStep, len); #endif #ifdef INTERP_SPEC - { - GLfixed ffsrend = span.specRed + len * span.specRedStep; - GLfixed ffsgend = span.specGreen + len * span.specGreenStep; - GLfixed ffsbend = span.specBlue + len * span.specBlueStep; - if (ffsrend < 0) { - span.specRed -= ffsrend; - if (span.specRed < 0) - span.specRed = 0; - } - if (ffsgend < 0) { - span.specGreen -= ffsgend; - if (span.specGreen < 0) - span.specGreen = 0; - } - if (ffsbend < 0) { - span.specBlue -= ffsbend; - if (span.specBlue < 0) - span.specBlue = 0; - } - } + CLAMP_INTERPOLANT(specRed, specRedStep, len); + CLAMP_INTERPOLANT(specGreen, specGreenStep, len); + CLAMP_INTERPOLANT(specBlue, specBlueStep, len); #endif #ifdef INTERP_INDEX - if (span.index < 0) - span.index = 0; + CLAMP_INTERPOLANT(index, indexStep, len); #endif - } /* span.end > 1 */ - - /* This is where we actually generate fragments */ - /* XXX the test for span.y > 0 _shouldn't_ be needed but - * it fixes a problem on 64-bit Opterons (bug 4842). - */ - if (span.end > 0 && span.y >= 0) { RENDER_SPAN( span ); } |