i915: fix wrong rendering of gl_PointSize on Pineview

The current code would ignore the point size specified by gl_PointSize
builtin variable in vertex shader on Pineview. This patch servers as
fixing that.

This patch fixes the following issues on Pineview:
webglc: https://cvs.khronos.org/svn/repos/registry/trunk/public/webgl/sdk/tests/conformance/rendering/point-size.html
piglit: glsl-vs-point-size

NOTE: This is a candidate for stable release branches.

v2: pick Eric's nice tip for fixing this issue in hardware rendering.
v3: the last arg of EMIT_ATTR specify the size in _byte_. (Eric)

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

diff --git a/src/mesa/drivers/dri/i915/i915_fragprog.c b/src/mesa/drivers/dri/i915/i915_fragprog.c
index 4f016a3..5b7e93e 100644 (file)
--- a/src/mesa/drivers/dri/i915/i915_fragprog.c
+++ b/src/mesa/drivers/dri/i915/i915_fragprog.c
@@ -1361,6 +1361,10 @@ i915ValidateFragmentProgram(struct i915_context *i915)
       EMIT_ATTR(_TNL_ATTRIB_POS, EMIT_3F_VIEWPORT, S4_VFMT_XYZ, 12);
    }
 
+   /* Handle gl_PointSize builtin var here */
+   if (ctx->Point._Attenuated || ctx->VertexProgram.PointSizeEnabled)
+      EMIT_ATTR(_TNL_ATTRIB_POINTSIZE, EMIT_1F, S4_VFMT_POINT_WIDTH, 4);
+
    if (inputsRead & FRAG_BIT_COL0) {
       intel->coloroffset = offset / 4;
       EMIT_ATTR(_TNL_ATTRIB_COLOR0, EMIT_4UB_4F_BGRA, S4_VFMT_COLOR, 4);