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radeonsi: extract TXQ buffer size computation into its own function 

This will allow it to be reused for RESQ.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Nicolai Hähnle 2016-02-07 17:34:57 -05:00
parent 515fb2c09c
commit 75539197c7
1 changed files with 35 additions and 20 deletions
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55
src/gallium/drivers/radeonsi/si_shader.c
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@ -2656,6 +2656,40 @@ static void si_llvm_return_fs_outputs(struct lp_build_tgsi_context *bld_base)
ctx->return_value = ret;
}
/**
* Given a v8i32 resource descriptor for a buffer, extract the size of the
* buffer in number of elements and return it as an i32.
*/
static LLVMValueRef get_buffer_size(
struct lp_build_tgsi_context *bld_base,
LLVMValueRef descriptor)
{
struct si_shader_context *ctx = si_shader_context(bld_base);
struct gallivm_state *gallivm = bld_base->base.gallivm;
LLVMBuilderRef builder = gallivm->builder;
LLVMValueRef size =
LLVMBuildExtractElement(builder, descriptor,
lp_build_const_int32(gallivm, 6), "");
if (ctx->screen->b.chip_class >= VI) {
/* On VI, the descriptor contains the size in bytes,
* but TXQ must return the size in elements.
* The stride is always non-zero for resources using TXQ.
*/
LLVMValueRef stride =
LLVMBuildExtractElement(builder, descriptor,
lp_build_const_int32(gallivm, 5), "");
stride = LLVMBuildLShr(builder, stride,
lp_build_const_int32(gallivm, 16), "");
stride = LLVMBuildAnd(builder, stride,
lp_build_const_int32(gallivm, 0x3FFF), "");
size = LLVMBuildUDiv(builder, size, stride, "");
}
return size;
}
static void build_tex_intrinsic(const struct lp_build_tgsi_action *action,
struct lp_build_tgsi_context *bld_base,
struct lp_build_emit_data *emit_data);
@ -2836,26 +2870,7 @@ static void tex_fetch_args(
if (target == TGSI_TEXTURE_BUFFER) {
/* Read the size from the buffer descriptor directly. */
LLVMValueRef res = LLVMBuildBitCast(builder, res_ptr, ctx->v8i32, "");
LLVMValueRef size = LLVMBuildExtractElement(builder, res,
lp_build_const_int32(gallivm, 6), "");
if (ctx->screen->b.chip_class >= VI) {
/* On VI, the descriptor contains the size in bytes,
* but TXQ must return the size in elements.
* The stride is always non-zero for resources using TXQ.
*/
LLVMValueRef stride =
LLVMBuildExtractElement(builder, res,
lp_build_const_int32(gallivm, 5), "");
stride = LLVMBuildLShr(builder, stride,
lp_build_const_int32(gallivm, 16), "");
stride = LLVMBuildAnd(builder, stride,
lp_build_const_int32(gallivm, 0x3FFF), "");
size = LLVMBuildUDiv(builder, size, stride, "");
}
emit_data->args[0] = size;
emit_data->args[0] = get_buffer_size(bld_base, res);
return;
}