diff options
| author | Keith Whitwell <keith@tungstengraphics.com> | 2006-10-10 15:00:53 +0000 |
|---|---|---|
| committer | Keith Whitwell <keith@tungstengraphics.com> | 2006-10-10 15:00:53 +0000 |
| commit | a64e6d7c7c3c719788af070779b46aef4334aec6 (patch) | |
| tree | cec3621ab940c056e3e372136f30b99b1c5d0ee3 | |
| parent | 0dab8d51e576730a909fee5f51d7385ca3b0ce3e (diff) | |
Rasterize smooth-shaded quads like trifans, which avoids texture
discontinuity along the diagonal.
| -rw-r--r-- | src/mesa/drivers/dri/i915/intel_tris.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/i915/intel_tris.c b/src/mesa/drivers/dri/i915/intel_tris.c index 78e9bd160f..1ba49d8f6e 100644 --- a/src/mesa/drivers/dri/i915/intel_tris.c +++ b/src/mesa/drivers/dri/i915/intel_tris.c @@ -188,8 +188,20 @@ intel_draw_quad(struct intel_context *intel, COPY_DWORDS(j, vb, vertsize, v0); COPY_DWORDS(j, vb, vertsize, v1); - COPY_DWORDS(j, vb, vertsize, v3); - COPY_DWORDS(j, vb, vertsize, v1); + + /* If smooth shading, draw like a trifan which gives better + * rasterization. Otherwise draw as two triangles with provoking + * vertex in third position as required for flat shading. + */ + if (intel->ctx.Light.ShadeModel == GL_FLAT) { + COPY_DWORDS(j, vb, vertsize, v3); + COPY_DWORDS(j, vb, vertsize, v1); + } + else { + COPY_DWORDS(j, vb, vertsize, v2); + COPY_DWORDS(j, vb, vertsize, v0); + } + COPY_DWORDS(j, vb, vertsize, v2); COPY_DWORDS(j, vb, vertsize, v3); } |