glsl: Add a lowering pass for gl_VertexID

Graphics / Mesa 3D Graphics Library / Mesa - Ian Romanick [intel.com] - 10 September 2014 13:05 UTC

Converts gl_VertexID to (gl_VertexIDMESA + gl_BaseVertex). gl_VertexIDMESA is backed by SYSTEM_VALUE_VERTEX_ID_ZERO_BASE, and gl_BaseVertex is backed by SYSTEM_VALUE_BASE_VERTEX.

v2: Put the enum in struct gl_constants and propoerly resolve the scope in C++ code. Fix suggested by Marek.

v3: Reabase on Matt's foreach_in_list changes (was using foreach_list).

v4 (Ken): Use a systemvalue instead of a uniform because STATE_BASE_VERTEX has been removed.

v5: Use a boolean to select lowering, and only allow one lowering method. Suggested by Ken.

v6 (Ken): Replace strcmp against literal "gl_BaseVertex"/"gl_VertexID" with SYSTEM_VALUE enum checks, for efficiency.

v7: Rebase on context constant initialization work.

ec08b5e glsl: Add a lowering pass for gl_VertexID
src/glsl/Makefile.sources | 1 +
src/glsl/ir_optimization.h | 2 +
src/glsl/linker.cpp | 3 +
src/glsl/lower_vertex_id.cpp | 144 ++++++++++++++++++++++++++++++++++++++++++
src/mesa/main/context.c | 6 ++
src/mesa/main/mtypes.h | 9 +++
6 files changed, 165 insertions(+)

Upstream: cgit.freedesktop.org

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