The OpenGL ES Shading Language specification describes the
values that may be output by a fragment shader. These are
gl_FragColor and gl_FragData[0]. Multiple render targets
are not supported in GLES.
Fixes dEQP test:
* dEQP-GLES3.functional.shaders.fragdata.invalid_assign_to_1
---
src/glsl/ast_array_index.cpp | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/src/glsl/ast_array_index.cpp b/src/glsl/ast_array_index.cpp
index ff0c757..b507d34 100644
--- a/src/glsl/ast_array_index.cpp
+++ b/src/glsl/ast_array_index.cpp
@@ -46,7 +46,9 @@ ast_array_specifier::print(void) const
*
* This function also checks whether the array is a built-in array whose
* maximum size is too small to accommodate the given index, and if so uses
- * loc and state to report the error.
+ * loc and state to report the error. It also checks that the built-in array
+ * gl_FragData is not accessed with indexes greater than zero in OpenGL ES,
+ * where multiple render targets are not allowed.
*/
static void
update_max_array_access(ir_rvalue *ir, int idx, YYLTYPE *loc,
@@ -54,6 +56,23 @@ update_max_array_access(ir_rvalue *ir, int idx, YYLTYPE *loc,
{
if (ir_dereference_variable *deref_var = ir->as_dereference_variable()) {
ir_variable *var = deref_var->var;
+
+ /* Page 89 in the section 3.8 (Fragment Shaders) of the the
+ * OpenGL ES 2.0.25 spec says:
+ * "The OpenGL ES Shading Language specification describes the
+ * values that may be output by a fragment shader. These are
+ * gl_FragColor and gl_FragData[0].
+ * ...
+ * gl_FragData is supported for compatibility with the desktop
+ * OpenGL Shading Language, but only a single fragment color
+ * output is allowed in the OpenGL ES Shading Language."
+ */
+ if (state->es_shader && idx > 0 &&
+ strcmp(var->name, "gl_FragData") == 0) {
+ _mesa_glsl_error(loc, state,
+ "multiple render targets are not supported");
+ }
+
if (idx > (int)var->data.max_array_access) {
var->data.max_array_access = idx;
--
2.1.3
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
