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added interpolate_fog()

This commit is contained in:
Brian Paul 2005-04-26 17:35:45 +00:00
parent c03b6f40ba
commit d09df24082
1 changed files with 26 additions and 0 deletions
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26
src/mesa/swrast/s_span.c
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@ -280,6 +280,26 @@ interpolate_specular(GLcontext *ctx, struct sw_span *span)
}
/* Fill in the span.array.fog values from the interpolation values */
static void
interpolate_fog(const GLcontext *ctx, struct sw_span *span)
{
GLfloat *fog = span->array->fog;
const GLfloat fogStep = span->fogStep;
GLfloat fogCoord = span->fog;
const GLuint haveW = (span->interpMask & SPAN_W);
const GLfloat wStep = haveW ? span->dwdx : 0.0F;
GLfloat w = haveW ? span->w : 1.0F;
GLuint i;
for (i = 0; i < span->end; i++) {
fog[i] = fogCoord / w;
fogCoord += fogStep;
w += wStep;
}
span->arrayMask |= SPAN_FOG;
}
/* Fill in the span.zArray array from the interpolation values */
void
_swrast_span_interpolate_z( const GLcontext *ctx, struct sw_span *span )
@ -1150,6 +1170,9 @@ _swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span)
if (span->interpMask & SPAN_SPEC)
interpolate_specular(ctx, span);
if (span->interpMask & SPAN_FOG)
interpolate_fog(ctx, span);
/* Compute fragment colors with fragment program or texture lookups */
if (ctx->FragmentProgram._Enabled)
/* XXX interpolate depth values here??? */
@ -1226,6 +1249,9 @@ _swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span)
if (span->interpMask & SPAN_SPEC)
interpolate_specular(ctx, span);
if (span->interpMask & SPAN_FOG)
interpolate_fog(ctx, span);
if (ctx->FragmentProgram._Enabled)
_swrast_exec_fragment_program( ctx, span );
else if (ctx->ATIFragmentShader._Enabled)