glsl: redeclare built-in variable with separate shader
according to : https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_separate_shader_objects.gles.txt properly handle the declaration of these interface block varibales Signed-off-by: cheyang <cheyang@bytedance.com> Reviewed-by: Tapani Pälli <tapani.palli@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8101>
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@ -4409,6 +4409,27 @@ get_variable_being_redeclared(ir_variable **var_ptr, YYLTYPE loc,
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earlier->data.how_declared == ir_var_declared_implicitly) {
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/* No need to do anything, just allow it. Qualifier is stored in state */
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} else if (state->is_version(0, 300) &&
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state->has_separate_shader_objects() &&
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(strcmp(var->name, "gl_Position") == 0 ||
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strcmp(var->name, "gl_PointSize") == 0)) {
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/* EXT_separate_shader_objects spec says:
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*
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* "The following vertex shader outputs may be redeclared
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* at global scope to specify a built-in output interface,
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* with or without special qualifiers:
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*
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* gl_Position
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* gl_PointSize
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*
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* When compiling shaders using either of the above variables,
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* both such variables must be redeclared prior to use."
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*/
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if (earlier->data.used) {
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_mesa_glsl_error(&loc, state, "the first redeclaration of "
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"%s must appear before any use", var->name);
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}
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} else if ((earlier->data.how_declared == ir_var_declared_implicitly &&
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state->allow_builtin_variable_redeclaration) ||
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allow_all_redeclarations) {
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