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i965: Lower the GLSL ES 3.00 pack/unpack operations (v2) 

On gen < 7, we fully lower all operations to arithmetic and bitwise
operations.

On gen >= 7, we fully lower the Snorm2x16 and Unorm2x16 operations, and
partially lower the Half2x16 operations.

v2:
  - Comment that scalarization is needed only for SOA code [for idr].
  - Replace switch-statement with if-statement [for idr].
  - Remove misplaced hunk from previous patch [found by idr].

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Tuner <mattst88@gmail.com>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>
This commit is contained in:
Chad Versace 2012-11-30 16:49:21 -08:00
parent b9f56ea923
commit ee0ed52d69
1 changed files with 32 additions and 0 deletions
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32
src/mesa/drivers/dri/i965/brw_shader.cpp
View File

@ -75,6 +75,34 @@ brw_shader_precompile(struct gl_context *ctx, struct gl_shader_program *prog)
return true;
}
static void
brw_lower_packing_builtins(struct brw_context *brw,
gl_shader_type shader_type,
exec_list *ir)
{
int ops = LOWER_PACK_SNORM_2x16
| LOWER_UNPACK_SNORM_2x16
| LOWER_PACK_UNORM_2x16
| LOWER_UNPACK_UNORM_2x16;
if (brw->intel.gen >= 7) {
/* Gen7 introduced the f32to16 and f16to32 instructions, which can be
* used to execute packHalf2x16 and unpackHalf2x16. For AOS code, no
* lowering is needed. For SOA code, the Half2x16 ops must be
* scalarized.
*/
if (shader_type == MESA_SHADER_FRAGMENT) {
ops |= LOWER_PACK_HALF_2x16_TO_SPLIT
| LOWER_UNPACK_HALF_2x16_TO_SPLIT;
}
} else {
ops |= LOWER_PACK_HALF_2x16
| LOWER_UNPACK_HALF_2x16;
}
lower_packing_builtins(ir, ops);
}
GLboolean
brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
{
@ -113,6 +141,10 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
shader->ir = new(shader) exec_list;
clone_ir_list(mem_ctx, shader->ir, shader->base.ir);
/* lower_packing_builtins() inserts arithmetic instructions, so it
* must precede lower_instructions().
*/
brw_lower_packing_builtins(brw, (gl_shader_type) stage, shader->ir);
do_mat_op_to_vec(shader->ir);
lower_instructions(shader->ir,
MOD_TO_FRACT |