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nir/spirv: Fix gl_BaseVertex for non-indexed draws for OpenGL 

Lowers BaseVertex to the correct system value for OpenGL.

v2: use options->environment rather than adding a new flag to
    spirv_to_nir_options

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
This commit is contained in:
Antia Puentes 2019-02-28 19:07:36 +01:00 committed by Caio Marcelo de Oliveira Filho
parent 382f92a814
commit 954224b714
1 changed files with 5 additions and 2 deletions
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7
src/compiler/spirv/vtn_variables.c
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@ -1411,9 +1411,12 @@ vtn_get_builtin_location(struct vtn_builder *b,
break;
case SpvBuiltInBaseVertex:
/* OpenGL gl_BaseVertex (SYSTEM_VALUE_BASE_VERTEX) is not the same
* semantic as SPIR-V BaseVertex (SYSTEM_VALUE_FIRST_VERTEX).
* semantic as Vulkan BaseVertex (SYSTEM_VALUE_FIRST_VERTEX).
*/
*location = SYSTEM_VALUE_FIRST_VERTEX;
if (b->options->environment == NIR_SPIRV_OPENGL)
*location = SYSTEM_VALUE_BASE_VERTEX;
else
*location = SYSTEM_VALUE_FIRST_VERTEX;
set_mode_system_value(b, mode);
break;
case SpvBuiltInBaseInstance: