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gallivm: implement LOAD with CONSTBUF but don't enable it for llvmpipe 

This is already used in st_draw_feedback.c, because it uses shaders
generated for drivers.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Marek Olšák 2019-11-27 17:10:45 -05:00
parent 525c8b90c7
commit 60db75cb77
1 changed files with 36 additions and 3 deletions
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39
src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
View File

@ -3097,13 +3097,46 @@ load_emit(
LLVMBuilderRef builder = bld->bld_base.base.gallivm->builder;
const struct tgsi_full_src_register *bufreg = &emit_data->inst->Src[0];
unsigned buf = bufreg->Register.Index;
assert(bufreg->Register.File == TGSI_FILE_BUFFER || bufreg->Register.File == TGSI_FILE_IMAGE || bufreg->Register.File == TGSI_FILE_MEMORY);
assert(bufreg->Register.File == TGSI_FILE_BUFFER ||
bufreg->Register.File == TGSI_FILE_IMAGE ||
bufreg->Register.File == TGSI_FILE_MEMORY ||
bufreg->Register.File == TGSI_FILE_CONSTBUF);
bool is_shared = bufreg->Register.File == TGSI_FILE_MEMORY;
struct lp_build_context *uint_bld = &bld_base->uint_bld;
if (bufreg->Register.File == TGSI_FILE_IMAGE)
if (bufreg->Register.File == TGSI_FILE_IMAGE) {
img_load_emit(action, bld_base, emit_data);
else if (0) {
} else if (bufreg->Register.File == TGSI_FILE_CONSTBUF) {
LLVMValueRef consts_ptr = bld->consts[buf];
LLVMValueRef num_consts = bld->consts_sizes[buf];
LLVMValueRef indirect_index;
LLVMValueRef overflow_mask;
indirect_index = lp_build_emit_fetch(bld_base, emit_data->inst, 1, 0);
indirect_index = lp_build_shr_imm(uint_bld, indirect_index, 4);
/* All fetches are from the same constant buffer, so
* we need to propagate the size to a vector to do a
* vector comparison */
num_consts = lp_build_broadcast_scalar(uint_bld, num_consts);
/* Gather values from the constant buffer */
unsigned chan_index;
TGSI_FOR_EACH_DST0_ENABLED_CHANNEL(emit_data->inst, chan_index) {
/* Construct a boolean vector telling us which channels
* overflow the bound constant buffer */
overflow_mask = lp_build_compare(gallivm, uint_bld->type, PIPE_FUNC_GEQUAL,
indirect_index, num_consts);
/* index_vec = indirect_index * 4 */
LLVMValueRef index_vec = lp_build_shl_imm(uint_bld, indirect_index, 2);
index_vec = lp_build_add(uint_bld, index_vec,
lp_build_const_int_vec(gallivm, uint_bld->type, chan_index));
emit_data->output[chan_index] = build_gather(bld_base, consts_ptr, index_vec, overflow_mask, NULL);
}
} else if (0) {
/* for indirect support with ARB_gpu_shader5 */
} else {
LLVMValueRef index;