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d8d54c5ccf
The Vulkan spec requires fragment shaders to declare an output covering Location 0, Component 3 (alpha) when alpha-to-coverage is enabled. This change: - Tracks alpha_to_coverage_enabled through RuntimeInfo from pipeline state - Forces declaration of frag_color[0] with full RGBA when enabled - Initializes alpha to 1.0 in shader epilogue if not explicitly written Signed-off-by: Zephyron <zephyron@citron-emu.org>