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do texcoord projective division in _swrast_span_default_texcoords()

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Brian Paul
2004-04-19 15:03:16 +00:00
parent 4697419c43
commit e63cb85cbc
1 changed files with 11 additions and 1 deletions
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src/mesa/swrast/s_span.c
+11 -1
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@@ -126,7 +126,17 @@ _swrast_span_default_texcoords( GLcontext *ctx, struct sw_span *span )
{
GLuint i;
for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
COPY_4V(span->tex[i], ctx->Current.RasterTexCoords[i]);
const GLfloat *tc = ctx->Current.RasterTexCoords[i];
if (tc[3] > 0.0F) {
/* use (s/q, t/q, r/q, 1) */
span->tex[i][0] = tc[0] / tc[3];
span->tex[i][1] = tc[1] / tc[3];
span->tex[i][2] = tc[2] / tc[3];
span->tex[i][3] = 1.0;
}
else {
ASSIGN_4V(span->tex[i], 0.0F, 0.0F, 0.0F, 1.0F);
}
ASSIGN_4V(span->texStepX[i], 0.0F, 0.0F, 0.0F, 0.0F);
ASSIGN_4V(span->texStepY[i], 0.0F, 0.0F, 0.0F, 0.0F);
}