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Pierre-Eric Pelloux-Prayer authored
This commit introduces a new way to zero-init variables but keep the old one to not break any existing behavior. With this change GLSLZeroInit becomes an integer, with the following possible values: - 0: no 0 init - 1: current behavior - 2: new behavior. Similar to 1, except ir_var_function_out type are 0 initialized but ir_var_shader_out. The rationale behind 2 is: zero initializing ir_var_shader_out can prevent some optimization where out variables are completely eliminated when not written to. On the other hand, zero initializing "ir_var_function_out" has no effect on correct shaders but typically helps shadertoy since the main function is: void mainImage(out vec4 fragColor) { ... } So with this change we're sure that fragColor will always get a value. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <!4607>
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