2014-12-01 14:04 GMT+01:00 Eduardo Lima Mitev <el...@igalia.com>:
> 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
AFAICS this restriction is lifted in ES 3.0+ (e.g. see section 3.9.2
in the OpenGL ES 3.0 spec).
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