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nir/lower_samplers: don't assume a deref for both texture and sampler srcs

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After commit "nir: Use derefs in nir_lower_samplers"
(75286c2d08) assumes one deref for both
the texture and the sampler. However there are cases (on OpenGL, using
ARB_gl_spirv) where SPIR-V is not providing a sampler, like for
texture query levels ops. Although we could make spirv_to_nir to
provide a sampler deref for those cases, it is not really needed, and
wrong from the Vulkan point of view.

This patch fixes the following (borrowed) tests run on SPIR-V mode:
  arb_compute_shader/execution/basic-texelFetch.shader_test
  arb_gpu_shader5/execution/sampler_array_indexing/fs-simple-texture-size.shader_test
  arb_texture_query_levels/execution/fs-baselevel.shader_test
  arb_texture_query_levels/execution/fs-maxlevel.shader_test
  arb_texture_query_levels/execution/fs-miptree.shader_test
  arb_texture_query_levels/execution/fs-nomips.shader_test
  arb_texture_query_levels/execution/vs-baselevel.shader_test
  arb_texture_query_levels/execution/vs-maxlevel.shader_test
  arb_texture_query_levels/execution/vs-miptree.shader_test
  arb_texture_query_levels/execution/vs-nomips.shader_test
  glsl-1.30/execution/fs-textureSize-compare.shader_test

v2: merge lower_tex_src_to_offset and calc_sampler_offsets together,
    update texture/sampler index and texture_array_size directly on
    lower_tex_src_to_offset (Jason)
v3: clarify one comment (Jason)

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Alejandro Piñeiro
2018-07-13 12:39:41 +02:00
parent fe2de39fb2
commit af194bd38e
1 changed files with 59 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
src/compiler/glsl/gl_nir_lower_samplers.c
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@@ -31,21 +31,20 @@
#include "main/compiler.h"
#include "main/mtypes.h"
/* Calculate the sampler index based on array indicies and also
* calculate the base uniform location for struct members.
*/
static void
calc_sampler_offsets(nir_builder *b, nir_ssa_def *ptr,
const struct gl_shader_program *shader_program,
unsigned *base_index, nir_ssa_def **index,
unsigned *array_elements)
lower_tex_src_to_offset(nir_builder *b,
nir_tex_instr *instr, unsigned src_idx,
const struct gl_shader_program *shader_program)
{
*base_index = 0;
*index = NULL;
*array_elements = 1;
nir_ssa_def *index = NULL;
unsigned base_index = 0;
unsigned array_elements = 1;
nir_tex_src *src = &instr->src[src_idx];
bool is_sampler = src->src_type == nir_tex_src_sampler_deref;
unsigned location = 0;
nir_deref_instr *deref = nir_instr_as_deref(ptr->parent_instr);
/* We compute first the offsets */
nir_deref_instr *deref = nir_instr_as_deref(src->src.ssa->parent_instr);
while (deref->deref_type != nir_deref_type_var) {
assert(deref->parent.is_ssa);
nir_deref_instr *parent =
@@ -61,22 +60,22 @@ calc_sampler_offsets(nir_builder *b, nir_ssa_def *ptr,
nir_const_value *const_deref_index =
nir_src_as_const_value(deref->arr.index);
if (const_deref_index && *index == NULL) {
if (const_deref_index && index == NULL) {
/* We're still building a direct index */
*base_index += const_deref_index->u32[0] * *array_elements;
base_index += const_deref_index->u32[0] * array_elements;
} else {
if (*index == NULL) {
if (index == NULL) {
/* We used to be direct but not anymore */
*index = nir_imm_int(b, *base_index);
*base_index = 0;
index = nir_imm_int(b, base_index);
base_index = 0;
}
*index = nir_iadd(b, *index,
nir_imul(b, nir_imm_int(b, *array_elements),
nir_ssa_for_src(b, deref->arr.index, 1)));
index = nir_iadd(b, index,
nir_imul(b, nir_imm_int(b, array_elements),
nir_ssa_for_src(b, deref->arr.index, 1)));
}
*array_elements *= glsl_get_length(parent->type);
array_elements *= glsl_get_length(parent->type);
break;
}
@@ -87,8 +86,8 @@ calc_sampler_offsets(nir_builder *b, nir_ssa_def *ptr,
deref = parent;
}
if (*index)
*index = nir_umin(b, *index, nir_imm_int(b, *array_elements - 1));
if (index)
index = nir_umin(b, index, nir_imm_int(b, array_elements - 1));
/* We hit the deref_var. This is the end of the line */
assert(deref->deref_type == nir_deref_type_var);
@@ -99,8 +98,31 @@ calc_sampler_offsets(nir_builder *b, nir_ssa_def *ptr,
assert(location < shader_program->data->NumUniformStorage &&
shader_program->data->UniformStorage[location].opaque[stage].active);
*base_index +=
base_index +=
shader_program->data->UniformStorage[location].opaque[stage].index;
/* We have the offsets, we apply them, rewriting the source or removing
* instr if needed
*/
if (index) {
nir_instr_rewrite_src(&instr->instr, &src->src,
nir_src_for_ssa(index));
src->src_type = is_sampler ?
nir_tex_src_sampler_offset :
nir_tex_src_texture_offset;
instr->texture_array_size = array_elements;
} else {
nir_tex_instr_remove_src(instr, src_idx);
}
if (is_sampler) {
instr->sampler_index = base_index;
} else {
instr->texture_index = base_index;
instr->texture_array_size = array_elements;
}
}
static bool
@@ -109,42 +131,25 @@ lower_sampler(nir_builder *b, nir_tex_instr *instr,
{
int texture_idx =
nir_tex_instr_src_index(instr, nir_tex_src_texture_deref);
if (texture_idx >= 0) {
b->cursor = nir_before_instr(&instr->instr);
lower_tex_src_to_offset(b, instr, texture_idx,
shader_program);
}
int sampler_idx =
nir_tex_instr_src_index(instr, nir_tex_src_sampler_deref);
if (texture_idx < 0)
return false;
assert(texture_idx >= 0 && sampler_idx >= 0);
assert(instr->src[texture_idx].src.is_ssa);
assert(instr->src[sampler_idx].src.is_ssa);
assert(instr->src[texture_idx].src.ssa == instr->src[sampler_idx].src.ssa);
b->cursor = nir_before_instr(&instr->instr);
unsigned base_offset, array_elements;
nir_ssa_def *indirect;
calc_sampler_offsets(b, instr->src[texture_idx].src.ssa, shader_program,
&base_offset, &indirect, &array_elements);
instr->texture_index = base_offset;
instr->sampler_index = base_offset;
if (indirect) {
nir_instr_rewrite_src(&instr->instr, &instr->src[texture_idx].src,
nir_src_for_ssa(indirect));
instr->src[texture_idx].src_type = nir_tex_src_texture_offset;
nir_instr_rewrite_src(&instr->instr, &instr->src[sampler_idx].src,
nir_src_for_ssa(indirect));
instr->src[sampler_idx].src_type = nir_tex_src_sampler_offset;
instr->texture_array_size = array_elements;
} else {
nir_tex_instr_remove_src(instr, texture_idx);
/* The sampler index may have changed */
sampler_idx = nir_tex_instr_src_index(instr, nir_tex_src_sampler_deref);
nir_tex_instr_remove_src(instr, sampler_idx);
if (sampler_idx >= 0) {
lower_tex_src_to_offset(b, instr, sampler_idx,
shader_program);
}
if (texture_idx < 0 && sampler_idx < 0)
return false;
return true;
}