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glsl: Add support for separate reference Z for shadow samplers

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ARB_gpu_shader5's textureGather*() functions which take shadow samplers
have a separate `refz` parameter rather than adding it to the
coordinate.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Chris Forbes 2013-10-10 19:32:34 +13:00
parent fb08769bb6
commit af1dfd99b7
1 changed files with 15 additions and 5 deletions
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20
src/glsl/builtin_functions.cpp
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@ -3383,11 +3383,21 @@ builtin_builder::_texture(ir_texture_opcode opcode,
if (flags & TEX_PROJECT)
tex->projector = swizzle(P, coord_type->vector_elements - 1, 1);
/* The shadow comparitor is normally in the Z component, but a few types
* have sufficiently large coordinates that it's in W.
*/
if (sampler_type->sampler_shadow)
tex->shadow_comparitor = swizzle(P, MAX2(coord_size, SWIZZLE_Z), 1);
if (sampler_type->sampler_shadow) {
if (opcode == ir_tg4) {
/* gather has refz as a separate parameter, immediately after the
* coordinate
*/
ir_variable *refz = in_var(glsl_type::float_type, "refz");
sig->parameters.push_tail(refz);
tex->shadow_comparitor = var_ref(refz);
} else {
/* The shadow comparitor is normally in the Z component, but a few types
* have sufficiently large coordinates that it's in W.
*/
tex->shadow_comparitor = swizzle(P, MAX2(coord_size, SWIZZLE_Z), 1);
}
}
if (opcode == ir_txl) {
ir_variable *lod = in_var(glsl_type::float_type, "lod");