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glsl/gs: Fix transform feedback of gl_ClipDistance.

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Since gl_ClipDistance is lowered from an array of floats to an array
of vec4's during compilation, transform feedback has special logic to
keep track of the pre-lowered array size so that attempting to perform
transform feedback on gl_ClipDistance produces a result with the
correct size.

Previously, this special logic always consulted the vertex shader's
size for gl_ClipDistance.  This patch fixes it so that it uses the
geometry shader's size for gl_ClipDistance when a geometry shader is
in use.

Fixes piglit test spec/glsl-1.50/transform-feedback-type-and-size.

v2: Change the type of LastClipDistanceArraySize to "unsigned", and
clarify the comment above it.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Paul Berry
2013-10-23 12:55:24 -07:00
parent fe36154ff3
commit 44b7ebe52d
3 changed files with 9 additions and 1 deletions
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src/glsl/linker.cpp
+2
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@@ -2100,6 +2100,7 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
validate_vertex_shader_executable(prog, sh);
if (!prog->LinkStatus)
goto done;
prog->LastClipDistanceArraySize = prog->Vert.ClipDistanceArraySize;
_mesa_reference_shader(ctx, &prog->_LinkedShaders[MESA_SHADER_VERTEX],
sh);
@@ -2132,6 +2133,7 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
validate_geometry_shader_executable(prog, sh);
if (!prog->LinkStatus)
goto done;
prog->LastClipDistanceArraySize = prog->Geom.ClipDistanceArraySize;
_mesa_reference_shader(ctx, &prog->_LinkedShaders[MESA_SHADER_GEOMETRY],
sh);