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authorPaul Berry <[email protected]>2011-09-17 09:42:02 -0700
committerPaul Berry <[email protected]>2011-09-23 13:28:51 -0700
commit1ad54ae0b1713e399c5db43d0eba87861075b4c7 (patch)
treeade022dea53ca82dffd50fde2cfdda3bdc240e68 /src/mesa/program/ir_to_mesa.cpp
parentc06e32596735074536b0e613cbddb1c5fd7b367a (diff)
mesa: Add a flag to indicate whether a program uses gl_ClipDistance.
GLSL 1.30 requires us to use gl_ClipDistance for clipping if the vertex shader contains a static write to it, and otherwise use user-defined clipping planes. Since the driver needs to behave differently in these two cases, we need a flag to record whether the shader has written to gl_ClipDistance. The new flag is called UsesClipDistance. We initially store it in gl_shader_program (since that is the data structure that is available when we check to see whethe gl_ClipDistance was written to), and we later copy it to a flag with the same name in gl_vertex_program, since that is a more convenient place for the driver to access it (in i965, at least). Reviewed-by: Eric Anholt <[email protected]> Tested-by: Brian Paul <[email protected]>
Diffstat (limited to 'src/mesa/program/ir_to_mesa.cpp')
-rw-r--r--src/mesa/program/ir_to_mesa.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 5e565e4ed08..7b2c69fdbdb 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -3291,6 +3291,8 @@ _mesa_ir_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
switch (prog->_LinkedShaders[i]->Type) {
case GL_VERTEX_SHADER:
+ ((struct gl_vertex_program *)linked_prog)->UsesClipDistance
+ = prog->Vert.UsesClipDistance;
_mesa_reference_vertprog(ctx, &prog->VertexProgram,
(struct gl_vertex_program *)linked_prog);
ok = ctx->Driver.ProgramStringNotify(ctx, GL_VERTEX_PROGRAM_ARB,