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nir: Rework the way samplers are lowered

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v2 Jason Ekstrand <jason.ekstrand@intel.com>:
 - Use the nir_tex_src_sampler_offset source type instead of the
   sampler_indirect thing that I cooked up before.

Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
This commit is contained in:
Jason Ekstrand
2014-12-05 16:09:53 -08:00
parent 4cdabcc0fa
commit 60ec60a600
1 changed files with 78 additions and 75 deletions
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153
src/glsl/nir/nir_lower_samplers.cpp
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@@ -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);
}