glsl: add helper to process xfb qualifiers during linking
This function checks for any xfb_* qualifiers which will enable transform feedback mode and cause any API defined xfb varyings to be ignored. It also counts the number of varyings that have a xfb_offset qualifier and finally it calls the create_xfb_varying_names() helper to generate the names of varyings to be caputured. Reviewed-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
parent
707fd3972f
commit
0822517936
|
@ -106,6 +106,72 @@ create_xfb_varying_names(void *mem_ctx, const glsl_type *t, char **name,
|
|||
}
|
||||
}
|
||||
|
||||
bool
|
||||
process_xfb_layout_qualifiers(void *mem_ctx, const gl_shader *sh,
|
||||
unsigned *num_tfeedback_decls,
|
||||
char ***varying_names)
|
||||
{
|
||||
bool has_xfb_qualifiers = false;
|
||||
|
||||
foreach_in_list(ir_instruction, node, sh->ir) {
|
||||
ir_variable *var = node->as_variable();
|
||||
if (!var || var->data.mode != ir_var_shader_out)
|
||||
continue;
|
||||
|
||||
/* From the ARB_enhanced_layouts spec:
|
||||
*
|
||||
* "Any shader making any static use (after preprocessing) of any of
|
||||
* these *xfb_* qualifiers will cause the shader to be in a
|
||||
* transform feedback capturing mode and hence responsible for
|
||||
* describing the transform feedback setup. This mode will capture
|
||||
* any output selected by *xfb_offset*, directly or indirectly, to
|
||||
* a transform feedback buffer."
|
||||
*/
|
||||
if (var->data.explicit_xfb_buffer || var->data.explicit_xfb_stride) {
|
||||
has_xfb_qualifiers = true;
|
||||
}
|
||||
|
||||
if (var->data.explicit_xfb_offset) {
|
||||
*num_tfeedback_decls += var->type->varying_count();
|
||||
has_xfb_qualifiers = true;
|
||||
}
|
||||
}
|
||||
|
||||
if (*num_tfeedback_decls == 0)
|
||||
return has_xfb_qualifiers;
|
||||
|
||||
unsigned i = 0;
|
||||
*varying_names = ralloc_array(mem_ctx, char *, *num_tfeedback_decls);
|
||||
foreach_in_list(ir_instruction, node, sh->ir) {
|
||||
ir_variable *var = node->as_variable();
|
||||
if (!var || var->data.mode != ir_var_shader_out)
|
||||
continue;
|
||||
|
||||
if (var->data.explicit_xfb_offset) {
|
||||
char *name;
|
||||
const glsl_type *type, *member_type;
|
||||
|
||||
if (var->data.from_named_ifc_block) {
|
||||
type = var->get_interface_type();
|
||||
/* Find the member type before it was altered by lowering */
|
||||
member_type =
|
||||
type->fields.structure[type->field_index(var->name)].type;
|
||||
name = ralloc_strdup(NULL, type->without_array()->name);
|
||||
} else {
|
||||
type = var->type;
|
||||
member_type = NULL;
|
||||
name = ralloc_strdup(NULL, var->name);
|
||||
}
|
||||
create_xfb_varying_names(mem_ctx, type, &name, strlen(name), &i,
|
||||
var->name, member_type, varying_names);
|
||||
ralloc_free(name);
|
||||
}
|
||||
}
|
||||
|
||||
assert(i == *num_tfeedback_decls);
|
||||
return has_xfb_qualifiers;
|
||||
}
|
||||
|
||||
/**
|
||||
* Validate the types and qualifiers of an output from one stage against the
|
||||
* matching input to another stage.
|
||||
|
|
|
@ -268,6 +268,11 @@ parse_tfeedback_decls(struct gl_context *ctx, struct gl_shader_program *prog,
|
|||
const void *mem_ctx, unsigned num_names,
|
||||
char **varying_names, tfeedback_decl *decls);
|
||||
|
||||
bool
|
||||
process_xfb_layout_qualifiers(void *mem_ctx, const gl_shader *sh,
|
||||
unsigned *num_tfeedback_decls,
|
||||
char ***varying_names);
|
||||
|
||||
void
|
||||
remove_unused_shader_inputs_and_outputs(bool is_separate_shader_object,
|
||||
gl_shader *sh,
|
||||
|
|
Loading…
Reference in New Issue