/* ir_variable::is_unmatched_generic_inout is used by the linker while
* connecting outputs from one stage to inputs of the next stage.
- *
- * There are two implicit assumptions here. First, we assume that any
- * built-in variable (i.e., non-generic in or out) will have
- * explicit_location set. Second, we assume that any generic in or out
- * will not have explicit_location set.
- *
- * This second assumption will only be valid until
- * GL_ARB_separate_shader_objects is supported. When that extension is
- * implemented, this function will need some modifications.
*/
- if (!var->data.explicit_location) {
- var->data.is_unmatched_generic_inout = 1;
- } else {
+ if (var->data.explicit_location &&
+ var->data.location < VARYING_SLOT_VAR0) {
var->data.is_unmatched_generic_inout = 0;
+ } else {
+ var->data.is_unmatched_generic_inout = 1;
}
}
}
continue;
if (var->data.explicit_location) {
+ var->data.is_unmatched_generic_inout = 0;
if ((var->data.location >= (int)(max_index + generic_base))
|| (var->data.location < 0)) {
linker_error(prog,
return true;
}
+/**
+ * Match explicit locations of outputs to inputs and deactivate the
+ * unmatch flag if found so we don't optimise them away.
+ */
+static void
+match_explicit_outputs_to_inputs(struct gl_shader_program *prog,
+ gl_shader *producer,
+ gl_shader *consumer)
+{
+ glsl_symbol_table parameters;
+ ir_variable *explicit_locations[MAX_VARYING] = { NULL };
+
+ /* Find all shader outputs in the "producer" stage.
+ */
+ foreach_in_list(ir_instruction, node, producer->ir) {
+ ir_variable *const var = node->as_variable();
+
+ if ((var == NULL) || (var->data.mode != ir_var_shader_out))
+ continue;
+
+ if (var->data.explicit_location &&
+ var->data.location >= VARYING_SLOT_VAR0) {
+ const unsigned idx = var->data.location - VARYING_SLOT_VAR0;
+ if (explicit_locations[idx] == NULL)
+ explicit_locations[idx] = var;
+ }
+ }
+
+ /* Match inputs to outputs */
+ foreach_in_list(ir_instruction, node, consumer->ir) {
+ ir_variable *const input = node->as_variable();
+
+ if ((input == NULL) || (input->data.mode != ir_var_shader_in))
+ continue;
+
+ ir_variable *output = NULL;
+ if (input->data.explicit_location
+ && input->data.location >= VARYING_SLOT_VAR0) {
+ output = explicit_locations[input->data.location - VARYING_SLOT_VAR0];
+
+ if (output != NULL){
+ input->data.is_unmatched_generic_inout = 0;
+ output->data.is_unmatched_generic_inout = 0;
+ }
+ }
+ }
+}
/**
* Demote shader inputs and outputs that are not used in other stages
assert(*num_ubos + *num_ssbos == num_blocks);
}
+static void
+set_always_active_io(exec_list *ir, ir_variable_mode io_mode)
+{
+ assert(io_mode == ir_var_shader_in || io_mode == ir_var_shader_out);
+
+ foreach_in_list(ir_instruction, node, ir) {
+ ir_variable *const var = node->as_variable();
+
+ if (var == NULL || var->data.mode != io_mode)
+ continue;
+
+ /* Don't set always active on builtins that haven't been redeclared */
+ if (var->data.how_declared == ir_var_declared_implicitly)
+ continue;
+
+ var->data.always_active_io = true;
+ }
+}
+
+/**
+ * When separate shader programs are enabled, only input/outputs between
+ * the stages of a multi-stage separate program can be safely removed
+ * from the shader interface. Other inputs/outputs must remain active.
+ */
+static void
+disable_varying_optimizations_for_sso(struct gl_shader_program *prog)
+{
+ unsigned first, last;
+ assert(prog->SeparateShader);
+
+ first = MESA_SHADER_STAGES;
+ last = 0;
+
+ /* Determine first and last stage. Excluding the compute stage */
+ for (unsigned i = 0; i < MESA_SHADER_COMPUTE; i++) {
+ if (!prog->_LinkedShaders[i])
+ continue;
+ if (first == MESA_SHADER_STAGES)
+ first = i;
+ last = i;
+ }
+
+ if (first == MESA_SHADER_STAGES)
+ return;
+
+ for (unsigned stage = 0; stage < MESA_SHADER_STAGES; stage++) {
+ gl_shader *sh = prog->_LinkedShaders[stage];
+ if (!sh)
+ continue;
+
+ if (first == last) {
+ /* For a single shader program only allow inputs to the vertex shader
+ * and outputs from the fragment shader to be removed.
+ */
+ if (stage != MESA_SHADER_VERTEX)
+ set_always_active_io(sh->ir, ir_var_shader_in);
+ if (stage != MESA_SHADER_FRAGMENT)
+ set_always_active_io(sh->ir, ir_var_shader_out);
+ } else {
+ /* For multi-stage separate shader programs only allow inputs and
+ * outputs between the shader stages to be removed as well as inputs
+ * to the vertex shader and outputs from the fragment shader.
+ */
+ if (stage == first && stage != MESA_SHADER_VERTEX)
+ set_always_active_io(sh->ir, ir_var_shader_in);
+ else if (stage == last && stage != MESA_SHADER_FRAGMENT)
+ set_always_active_io(sh->ir, ir_var_shader_out);
+ }
+ }
+}
+
void
link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
{
}
}
+ if (prog->SeparateShader)
+ disable_varying_optimizations_for_sso(prog);
+
if (!interstage_cross_validate_uniform_blocks(prog))
goto done;
}
}
+ prev = first;
+ for (unsigned i = prev + 1; i <= MESA_SHADER_FRAGMENT; i++) {
+ if (prog->_LinkedShaders[i] == NULL)
+ continue;
+
+ match_explicit_outputs_to_inputs(prog, prog->_LinkedShaders[prev],
+ prog->_LinkedShaders[i]);
+ prev = i;
+ }
+
if (!assign_attribute_or_color_locations(prog, &ctx->Const,
MESA_SHADER_VERTEX)) {
goto done;
do_dead_builtin_varyings(ctx, sh, NULL,
num_tfeedback_decls, tfeedback_decls);
- if (!prog->SeparateShader)
+ if (!prog->SeparateShader) {
demote_shader_inputs_and_outputs(sh, ir_var_shader_out);
-
- /* Eliminate code that is now dead due to unused outputs being demoted.
- */
- while (do_dead_code(sh->ir, false))
- ;
+ /* Eliminate code that is now dead due to unused outputs being
+ * demoted.
+ */
+ while (do_dead_code(sh->ir, false))
+ ;
+ }
}
else if (first == MESA_SHADER_FRAGMENT) {
/* If the program only contains a fragment shader...
0 /* num_tfeedback_decls */,
NULL /* tfeedback_decls */))
goto done;
- } else
+ } else {
demote_shader_inputs_and_outputs(sh, ir_var_shader_in);
-
- while (do_dead_code(sh->ir, false))
- ;
+ /* Eliminate code that is now dead due to unused inputs being
+ * demoted.
+ */
+ while (do_dead_code(sh->ir, false))
+ ;
+ }
}
next = last;
if (ctx->Const.ShaderCompilerOptions[i].LowerBufferInterfaceBlocks)
lower_ubo_reference(prog->_LinkedShaders[i]);
+ if (ctx->Const.ShaderCompilerOptions[i].LowerShaderSharedVariables)
+ lower_shared_reference(prog->_LinkedShaders[i],
+ &prog->Comp.SharedSize);
+
lower_vector_derefs(prog->_LinkedShaders[i]);
}
projects / mesa.git / blobdiff