diff options
author | Brian Paul <brian.paul@tungstengraphics.com> | 2004-04-19 15:03:16 +0000 |
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committer | Brian Paul <brian.paul@tungstengraphics.com> | 2004-04-19 15:03:16 +0000 |
commit | e63cb85cbc13c083f5d9f4640bb81ba9417a4f28 (patch) | |
tree | f53df83f3c69984dc98ba906f598d4de6add23c9 /src/mesa/swrast/s_span.c | |
parent | 4697419c43c79585abd067d1dea438861691b9ae (diff) |
do texcoord projective division in _swrast_span_default_texcoords()
Diffstat (limited to 'src/mesa/swrast/s_span.c')
-rw-r--r-- | src/mesa/swrast/s_span.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c index b74f62b6c68..0abeaec1355 100644 --- a/src/mesa/swrast/s_span.c +++ b/src/mesa/swrast/s_span.c @@ -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); } |