diff options
Diffstat (limited to 'src/glsl/nir/nir_lower_samplers.cpp')
| -rw-r--r-- | src/glsl/nir/nir_lower_samplers.cpp | 153 |
1 files changed, 78 insertions, 75 deletions
diff --git a/src/glsl/nir/nir_lower_samplers.cpp b/src/glsl/nir/nir_lower_samplers.cpp index d94183ceee0..5e90a4ce82e 100644 --- a/src/glsl/nir/nir_lower_samplers.cpp +++ b/src/glsl/nir/nir_lower_samplers.cpp @@ -36,67 +36,9 @@ extern "C" { } static unsigned -get_deref_name_offset(nir_deref_var *deref_var, - gl_shader_program *shader_program, char **name, - void *mem_ctx) -{ - nir_deref *deref = &deref_var->deref; - nir_deref_array *deref_array; - nir_deref_struct *deref_struct; - - *name = ralloc_strdup(mem_ctx, deref_var->var->name); - - while (deref->child != NULL) { - switch (deref->child->deref_type) { - case nir_deref_type_array: - deref_array = nir_deref_as_array(deref->child); - if (deref_array->deref_array_type == nir_deref_array_type_indirect) { - /* GLSL 1.10 and 1.20 allowed variable sampler array indices, - * while GLSL 1.30 requires that the array indices be - * constant integer expressions. We don't expect any driver - * to actually work with a really variable array index, so - * all that would work would be an unrolled loop counter that - * ends up being constant. - */ - ralloc_strcat(&shader_program->InfoLog, - "warning: Variable sampler array index unsupported.\n" - "This feature of the language was removed in GLSL 1.20 " - "and is unlikely to be supported for 1.10 in Mesa.\n"); - } - if (deref_array->deref.child == NULL) { - return deref_array->base_offset; - } - ralloc_asprintf_append(name, "[%u]", deref_array->base_offset); - break; - - case nir_deref_type_struct: { - deref_struct = nir_deref_as_struct(deref->child); - const char *field = glsl_get_struct_elem_name(deref->type, - deref_struct->index); - ralloc_asprintf_append(name, ".%s", field); - break; - } - - default: - assert(0); - break; - } - deref = deref->child; - } - - return 0; -} - -static unsigned -get_sampler_index(nir_deref_var *sampler, - struct gl_shader_program *shader_program, +get_sampler_index(struct gl_shader_program *shader_program, const char *name, const struct gl_program *prog) { - void *mem_ctx = ralloc_context(NULL); - char *name; - unsigned offset = get_deref_name_offset(sampler, shader_program, &name, - mem_ctx); - GLuint shader = _mesa_program_enum_to_shader_stage(prog->Target); unsigned location; @@ -115,33 +57,90 @@ get_sampler_index(nir_deref_var *sampler, return 0; } - ralloc_free(mem_ctx); - - return shader_program->UniformStorage[location].sampler[shader].index + - offset; + return shader_program->UniformStorage[location].sampler[shader].index; } static void lower_sampler(nir_tex_instr *instr, struct gl_shader_program *shader_program, - const struct gl_program *prog) + const struct gl_program *prog, void *mem_ctx) { - if (instr->sampler) { - instr->sampler_index = get_sampler_index(instr->sampler, shader_program, - prog); - nir_src empty_src; - memset(&empty_src, 0, sizeof empty_src); - for (nir_deref *deref = &instr->sampler->deref; deref; deref = deref->child) { - if (deref->deref_type == nir_deref_type_array) { - nir_deref_array *arr = nir_deref_as_array(deref); - nir_instr_rewrite_src(&instr->instr, &arr->indirect, empty_src); + if (instr->sampler == NULL) + return; + + /* Get the name and the offset */ + instr->sampler_index = 0; + bool has_indirect = false; + char *name = ralloc_strdup(mem_ctx, instr->sampler->var->name); + + for (nir_deref *deref = &instr->sampler->deref; + deref->child; deref = deref->child) { + switch (deref->child->deref_type) { + case nir_deref_type_array: { + nir_deref_array *deref_array = nir_deref_as_array(deref->child); + + /* XXX: We're assuming here that the indirect is the last array + * thing we have. This should be ok for now as we don't support + * arrays_of_arrays yet. + */ + assert(!has_indirect); + + instr->sampler_index *= glsl_get_length(deref->type); + switch (deref_array->deref_array_type) { + case nir_deref_array_type_direct: + instr->sampler_index += deref_array->base_offset; + if (deref_array->deref.child) + ralloc_asprintf_append(&name, "[%u]", deref_array->base_offset); + break; + case nir_deref_array_type_indirect: { + assert(!has_indirect); + + assert(instr->num_srcs < 4); + + nir_instr_rewrite_src(&instr->instr, &instr->src[instr->num_srcs], + nir_src_copy(deref_array->indirect, mem_ctx)); + instr->src_type[instr->num_srcs] = nir_tex_src_sampler_offset; + instr->num_srcs++; + + instr->sampler_array_size = glsl_get_length(deref->type); + + nir_src empty; + memset(&empty, 0, sizeof empty); + nir_instr_rewrite_src(&instr->instr, &deref_array->indirect, empty); + + if (deref_array->deref.child) + ralloc_strcat(&name, "[0]"); + break; } + + case nir_deref_array_type_wildcard: + unreachable("Cannot copy samplers"); + default: + unreachable("Invalid deref array type"); + } + break; } - instr->sampler = NULL; + case nir_deref_type_struct: { + nir_deref_struct *deref_struct = nir_deref_as_struct(deref->child); + const char *field = glsl_get_struct_elem_name(deref->type, + deref_struct->index); + ralloc_asprintf_append(&name, ".%s", field); + break; + } + + default: + unreachable("Invalid deref type"); + break; + } } + + instr->sampler_index += get_sampler_index(shader_program, name, prog); + + instr->sampler = NULL; } typedef struct { + void *mem_ctx; struct gl_shader_program *shader_program; struct gl_program *prog; } lower_state; @@ -154,7 +153,8 @@ lower_block_cb(nir_block *block, void *_state) nir_foreach_instr(block, instr) { if (instr->type == nir_instr_type_tex) { nir_tex_instr *tex_instr = nir_instr_as_tex(instr); - lower_sampler(tex_instr, state->shader_program, state->prog); + lower_sampler(tex_instr, state->shader_program, state->prog, + state->mem_ctx); } } @@ -166,8 +166,11 @@ lower_impl(nir_function_impl *impl, struct gl_shader_program *shader_program, struct gl_program *prog) { lower_state state; + + state.mem_ctx = ralloc_parent(impl); state.shader_program = shader_program; state.prog = prog; + nir_foreach_block(impl, lower_block_cb, &state); } |