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compiler/nir: Add conditional lowering for gl_BaseVertex

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Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Antia Puentes 2018-04-28 14:09:21 +02:00
parent 0cbf29fa55
commit 0fb204fac1
2 changed files with 21 additions and 0 deletions
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6
src/compiler/nir/nir.h
View file

@ -1930,6 +1930,12 @@ typedef struct nir_shader_compiler_options {
/* Indicates that the driver only has zero-based vertex id */
bool vertex_id_zero_based;
/**
* If enabled, gl_BaseVertex will be lowered as:
* is_indexed_draw (~0/0) & firstvertex
*/
bool lower_base_vertex;
bool lower_cs_local_index_from_id;
bool lower_device_index_to_zero;

15
src/compiler/nir/nir_lower_system_values.c
View file

@ -121,6 +121,21 @@ convert_block(nir_block *block, nir_builder *b)
}
break;
case SYSTEM_VALUE_BASE_VERTEX:
/**
* From the OpenGL 4.6 (11.1.3.9 Shader Inputs) specification:
*
* "gl_BaseVertex holds the integer value passed to the baseVertex
* parameter to the command that resulted in the current shader
* invocation. In the case where the command has no baseVertex
* parameter, the value of gl_BaseVertex is zero."
*/
if (b->shader->options->lower_base_vertex)
sysval = nir_iand(b,
nir_load_is_indexed_draw(b),
nir_load_first_vertex(b));
break;
case SYSTEM_VALUE_INSTANCE_INDEX:
sysval = nir_iadd(b,
nir_load_instance_id(b),