return earlier;
}
+/**
+ * Generate the IR for an initializer in a variable declaration
+ */
+ir_rvalue *
+process_initializer(ir_variable *var, ast_declaration *decl,
+ ast_fully_specified_type *type,
+ exec_list *initializer_instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ ir_rvalue *result = NULL;
+
+ YYLTYPE initializer_loc = decl->initializer->get_location();
+
+ /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "All uniform variables are read-only and are initialized either
+ * directly by an application via API commands, or indirectly by
+ * OpenGL."
+ */
+ if ((state->language_version <= 110)
+ && (var->mode == ir_var_uniform)) {
+ _mesa_glsl_error(& initializer_loc, state,
+ "cannot initialize uniforms in GLSL 1.10");
+ }
+
+ if (var->type->is_sampler()) {
+ _mesa_glsl_error(& initializer_loc, state,
+ "cannot initialize samplers");
+ }
+
+ if ((var->mode == ir_var_in) && (state->current_function == NULL)) {
+ _mesa_glsl_error(& initializer_loc, state,
+ "cannot initialize %s shader input / %s",
+ _mesa_glsl_shader_target_name(state->target),
+ (state->target == vertex_shader)
+ ? "attribute" : "varying");
+ }
+
+ ir_dereference *const lhs = new(state) ir_dereference_variable(var);
+ ir_rvalue *rhs = decl->initializer->hir(initializer_instructions,
+ state);
+
+ /* Calculate the constant value if this is a const or uniform
+ * declaration.
+ */
+ if (type->qualifier.flags.q.constant
+ || type->qualifier.flags.q.uniform) {
+ ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs);
+ if (new_rhs != NULL) {
+ rhs = new_rhs;
+
+ ir_constant *constant_value = rhs->constant_expression_value();
+ if (!constant_value) {
+ _mesa_glsl_error(& initializer_loc, state,
+ "initializer of %s variable `%s' must be a "
+ "constant expression",
+ (type->qualifier.flags.q.constant)
+ ? "const" : "uniform",
+ decl->identifier);
+ if (var->type->is_numeric()) {
+ /* Reduce cascading errors. */
+ var->constant_value = ir_constant::zero(state, var->type);
+ }
+ } else {
+ rhs = constant_value;
+ var->constant_value = constant_value;
+ }
+ } else {
+ _mesa_glsl_error(&initializer_loc, state,
+ "initializer of type %s cannot be assigned to "
+ "variable of type %s",
+ rhs->type->name, var->type->name);
+ if (var->type->is_numeric()) {
+ /* Reduce cascading errors. */
+ var->constant_value = ir_constant::zero(state, var->type);
+ }
+ }
+ }
+
+ if (rhs && !rhs->type->is_error()) {
+ bool temp = var->read_only;
+ if (type->qualifier.flags.q.constant)
+ var->read_only = false;
+
+ /* Never emit code to initialize a uniform.
+ */
+ const glsl_type *initializer_type;
+ if (!type->qualifier.flags.q.uniform) {
+ result = do_assignment(initializer_instructions, state,
+ lhs, rhs,
+ type->get_location());
+ initializer_type = result->type;
+ } else
+ initializer_type = rhs->type;
+
+ /* If the declared variable is an unsized array, it must inherrit
+ * its full type from the initializer. A declaration such as
+ *
+ * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
+ *
+ * becomes
+ *
+ * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
+ *
+ * The assignment generated in the if-statement (below) will also
+ * automatically handle this case for non-uniforms.
+ *
+ * If the declared variable is not an array, the types must
+ * already match exactly. As a result, the type assignment
+ * here can be done unconditionally. For non-uniforms the call
+ * to do_assignment can change the type of the initializer (via
+ * the implicit conversion rules). For uniforms the initializer
+ * must be a constant expression, and the type of that expression
+ * was validated above.
+ */
+ var->type = initializer_type;
+
+ var->read_only = temp;
+ }
+
+ return result;
+}
+
ir_rvalue *
ast_declarator_list::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
* instruction stream.
*/
exec_list initializer_instructions;
- if (decl->initializer != NULL) {
- YYLTYPE initializer_loc = decl->initializer->get_location();
-
- /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
- *
- * "All uniform variables are read-only and are initialized either
- * directly by an application via API commands, or indirectly by
- * OpenGL."
- */
- if ((state->language_version <= 110)
- && (var->mode == ir_var_uniform)) {
- _mesa_glsl_error(& initializer_loc, state,
- "cannot initialize uniforms in GLSL 1.10");
- }
-
- if (var->type->is_sampler()) {
- _mesa_glsl_error(& initializer_loc, state,
- "cannot initialize samplers");
- }
-
- if ((var->mode == ir_var_in) && (state->current_function == NULL)) {
- _mesa_glsl_error(& initializer_loc, state,
- "cannot initialize %s shader input / %s",
- _mesa_glsl_shader_target_name(state->target),
- (state->target == vertex_shader)
- ? "attribute" : "varying");
- }
-
- ir_dereference *const lhs = new(ctx) ir_dereference_variable(var);
- ir_rvalue *rhs = decl->initializer->hir(&initializer_instructions,
- state);
-
- /* Calculate the constant value if this is a const or uniform
- * declaration.
- */
- if (this->type->qualifier.flags.q.constant
- || this->type->qualifier.flags.q.uniform) {
- ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs);
- if (new_rhs != NULL) {
- rhs = new_rhs;
-
- ir_constant *constant_value = rhs->constant_expression_value();
- if (!constant_value) {
- _mesa_glsl_error(& initializer_loc, state,
- "initializer of %s variable `%s' must be a "
- "constant expression",
- (this->type->qualifier.flags.q.constant)
- ? "const" : "uniform",
- decl->identifier);
- if (var->type->is_numeric()) {
- /* Reduce cascading errors. */
- var->constant_value = ir_constant::zero(ctx, var->type);
- }
- } else {
- rhs = constant_value;
- var->constant_value = constant_value;
- }
- } else {
- _mesa_glsl_error(&initializer_loc, state,
- "initializer of type %s cannot be assigned to "
- "variable of type %s",
- rhs->type->name, var->type->name);
- if (var->type->is_numeric()) {
- /* Reduce cascading errors. */
- var->constant_value = ir_constant::zero(ctx, var->type);
- }
- }
- }
-
- if (rhs && !rhs->type->is_error()) {
- bool temp = var->read_only;
- if (this->type->qualifier.flags.q.constant)
- var->read_only = false;
-
- /* Never emit code to initialize a uniform.
- */
- const glsl_type *initializer_type;
- if (!this->type->qualifier.flags.q.uniform) {
- result = do_assignment(&initializer_instructions, state,
- lhs, rhs,
- this->get_location());
- initializer_type = result->type;
- } else
- initializer_type = rhs->type;
-
- /* If the declared variable is an unsized array, it must inherrit
- * its full type from the initializer. A declaration such as
- *
- * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
- *
- * becomes
- *
- * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
- *
- * The assignment generated in the if-statement (below) will also
- * automatically handle this case for non-uniforms.
- *
- * If the declared variable is not an array, the types must
- * already match exactly. As a result, the type assignment
- * here can be done unconditionally. For non-uniforms the call
- * to do_assignment can change the type of the initializer (via
- * the implicit conversion rules). For uniforms the initializer
- * must be a constant expression, and the type of that expression
- * was validated above.
- */
- var->type = initializer_type;
+ ir_variable *earlier = get_variable_being_redeclared(var, decl, state);
- var->read_only = temp;
- }
+ if (decl->initializer != NULL) {
+ result = process_initializer((earlier == NULL) ? var : earlier,
+ decl, this->type,
+ &initializer_instructions, state);
}
/* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
decl->identifier);
}
- ir_variable *earlier = get_variable_being_redeclared(var, decl, state);
- if (earlier != NULL) {
- continue;
- }
-
- /* By now, we know it's a new variable declaration (we didn't hit the
- * above "continue").
- *
- * From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
- *
- * "Identifiers starting with "gl_" are reserved for use by
- * OpenGL, and may not be declared in a shader as either a
- * variable or a function."
+ /* If the declaration is not a redeclaration, there are a few additional
+ * semantic checks that must be applied. In addition, variable that was
+ * created for the declaration should be added to the IR stream.
*/
- if (strncmp(decl->identifier, "gl_", 3) == 0)
- _mesa_glsl_error(& loc, state,
- "identifier `%s' uses reserved `gl_' prefix",
- decl->identifier);
+ if (earlier == NULL) {
+ /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
+ *
+ * "Identifiers starting with "gl_" are reserved for use by
+ * OpenGL, and may not be declared in a shader as either a
+ * variable or a function."
+ */
+ if (strncmp(decl->identifier, "gl_", 3) == 0)
+ _mesa_glsl_error(& loc, state,
+ "identifier `%s' uses reserved `gl_' prefix",
+ decl->identifier);
- /* Add the variable to the symbol table. Note that the initializer's
- * IR was already processed earlier (though it hasn't been emitted yet),
- * without the variable in scope.
- *
- * This differs from most C-like languages, but it follows the GLSL
- * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
- * spec:
- *
- * "Within a declaration, the scope of a name starts immediately
- * after the initializer if present or immediately after the name
- * being declared if not."
- */
- if (!state->symbols->add_variable(var)) {
- YYLTYPE loc = this->get_location();
- _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
- "current scope", decl->identifier);
- continue;
+ /* Add the variable to the symbol table. Note that the initializer's
+ * IR was already processed earlier (though it hasn't been emitted
+ * yet), without the variable in scope.
+ *
+ * This differs from most C-like languages, but it follows the GLSL
+ * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
+ * spec:
+ *
+ * "Within a declaration, the scope of a name starts immediately
+ * after the initializer if present or immediately after the name
+ * being declared if not."
+ */
+ if (!state->symbols->add_variable(var)) {
+ YYLTYPE loc = this->get_location();
+ _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
+ "current scope", decl->identifier);
+ continue;
+ }
+
+ /* Push the variable declaration to the top. It means that all the
+ * variable declarations will appear in a funny last-to-first order,
+ * but otherwise we run into trouble if a function is prototyped, a
+ * global var is decled, then the function is defined with usage of
+ * the global var. See glslparsertest's CorrectModule.frag.
+ */
+ instructions->push_head(var);
}
- /* Push the variable declaration to the top. It means that all
- * the variable declarations will appear in a funny
- * last-to-first order, but otherwise we run into trouble if a
- * function is prototyped, a global var is decled, then the
- * function is defined with usage of the global var. See
- * glslparsertest's CorrectModule.frag.
- */
- instructions->push_head(var);
instructions->append_list(&initializer_instructions);
}
projects / mesa.git / blobdiff