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ac: use the common helper ac_apply_fmask_to_sample

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Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
This commit is contained in:
Marek Olšák 2019-04-10 21:24:57 -04:00
parent 971bc10177
commit f4ae188d50
1 changed files with 5 additions and 64 deletions
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69
src/amd/common/ac_nir_to_llvm.c
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@ -2281,77 +2281,18 @@ static int image_type_to_components_count(enum glsl_sampler_dim dim, bool array)
return 0;
}
/* Adjust the sample index according to FMASK.
*
* For uncompressed MSAA surfaces, FMASK should return 0x76543210,
* which is the identity mapping. Each nibble says which physical sample
* should be fetched to get that sample.
*
* For example, 0x11111100 means there are only 2 samples stored and
* the second sample covers 3/4 of the pixel. When reading samples 0
* and 1, return physical sample 0 (determined by the first two 0s
* in FMASK), otherwise return physical sample 1.
*
* The sample index should be adjusted as follows:
* sample_index = (fmask >> (sample_index * 4)) & 0xF;
*/
static LLVMValueRef adjust_sample_index_using_fmask(struct ac_llvm_context *ctx,
LLVMValueRef coord_x, LLVMValueRef coord_y,
LLVMValueRef coord_z,
LLVMValueRef sample_index,
LLVMValueRef fmask_desc_ptr)
{
struct ac_image_args args = {0};
LLVMValueRef res;
unsigned sample_chan = coord_z ? 3 : 2;
LLVMValueRef addr[4] = {coord_x, coord_y, coord_z};
addr[sample_chan] = sample_index;
args.coords[0] = coord_x;
args.coords[1] = coord_y;
if (coord_z)
args.coords[2] = coord_z;
args.opcode = ac_image_load;
args.dim = coord_z ? ac_image_2darray : ac_image_2d;
args.resource = fmask_desc_ptr;
args.dmask = 0xf;
args.attributes = AC_FUNC_ATTR_READNONE;
res = ac_build_image_opcode(ctx, &args);
LLVMValueRef four = LLVMConstInt(ctx->i32, 4, false);
LLVMValueRef F = LLVMConstInt(ctx->i32, 0xf, false);
LLVMValueRef fmask = LLVMBuildExtractElement(ctx->builder,
res,
ctx->i32_0, "");
LLVMValueRef sample_index4 =
LLVMBuildMul(ctx->builder, sample_index, four, "");
LLVMValueRef shifted_fmask =
LLVMBuildLShr(ctx->builder, fmask, sample_index4, "");
LLVMValueRef final_sample =
LLVMBuildAnd(ctx->builder, shifted_fmask, F, "");
/* Don't rewrite the sample index if WORD1.DATA_FORMAT of the FMASK
* resource descriptor is 0 (invalid),
*/
LLVMValueRef fmask_desc =
LLVMBuildBitCast(ctx->builder, fmask_desc_ptr,
ctx->v8i32, "");
LLVMValueRef fmask_word1 =
LLVMBuildExtractElement(ctx->builder, fmask_desc,
ctx->i32_1, "");
LLVMValueRef word1_is_nonzero =
LLVMBuildICmp(ctx->builder, LLVMIntNE,
fmask_word1, ctx->i32_0, "");
/* Replace the MSAA sample index. */
sample_index =
LLVMBuildSelect(ctx->builder, word1_is_nonzero,
final_sample, sample_index, "");
return sample_index;
ac_apply_fmask_to_sample(ctx, fmask_desc_ptr, addr, coord_z != NULL);
return addr[sample_chan];
}
static nir_deref_instr *get_image_deref(const nir_intrinsic_instr *instr)