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i965/fs: Add support for shadow comparitors with gather4

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Note that gather4_po_c's parameters are too long for SIMD16. It might be
worth emitting 2xSIMD8 messages in this case at some point.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Chris Forbes 2013-10-10 19:57:29 +13:00
parent 32f898a71c
commit 3c98d77460
2 changed files with 15 additions and 3 deletions
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15
src/mesa/drivers/dri/i965/brw_fs_generator.cpp
View file

@ -435,12 +435,21 @@ fs_generator::generate_tex(fs_inst *inst, struct brw_reg dst, struct brw_reg src
msg_type = GEN5_SAMPLER_MESSAGE_LOD;
break;
case SHADER_OPCODE_TG4:
assert(brw->gen >= 6);
msg_type = GEN7_SAMPLER_MESSAGE_SAMPLE_GATHER4;
if (inst->shadow_compare) {
assert(brw->gen >= 7);
msg_type = GEN7_SAMPLER_MESSAGE_SAMPLE_GATHER4_C;
} else {
assert(brw->gen >= 6);
msg_type = GEN7_SAMPLER_MESSAGE_SAMPLE_GATHER4;
}
break;
case SHADER_OPCODE_TG4_OFFSET:
assert(brw->gen >= 7);
msg_type = GEN7_SAMPLER_MESSAGE_SAMPLE_GATHER4_PO;
if (inst->shadow_compare) {
msg_type = GEN7_SAMPLER_MESSAGE_SAMPLE_GATHER4_PO_C;
} else {
msg_type = GEN7_SAMPLER_MESSAGE_SAMPLE_GATHER4_PO;
}
break;
default:
assert(!"not reached");

3
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
View file

@ -1359,6 +1359,9 @@ fs_visitor::emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
break;
case ir_tg4:
if (has_nonconstant_offset) {
if (ir->shadow_comparitor && dispatch_width == 16)
fail("Gen7 does not support gather4_po_c in SIMD16 mode.");
/* More crazy intermixing */
ir->offset->accept(this);
fs_reg offset_value = this->result;