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PixelShaderGen: Add shader logic ops support on Metal
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@ -842,6 +842,7 @@ static void WriteTevRegular(ShaderCode& out, std::string_view components, TevBia
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static void WriteAlphaTest(ShaderCode& out, const pixel_shader_uid_data* uid_data, APIType api_type,
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bool per_pixel_depth, bool use_dual_source);
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static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data);
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static void WriteLogicOp(ShaderCode& out, const pixel_shader_uid_data* uid_data);
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static void WriteColor(ShaderCode& out, APIType api_type, const pixel_shader_uid_data* uid_data,
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bool use_dual_source);
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static void WriteBlend(ShaderCode& out, const pixel_shader_uid_data* uid_data);
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@ -930,10 +931,48 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
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uid_data->useDstAlpha);
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const bool use_shader_blend =
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!use_dual_source && (uid_data->useDstAlpha && host_config.backend_shader_framebuffer_fetch);
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const bool use_shader_logic_op =
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#ifdef __APPLE__
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!host_config.backend_logic_op && host_config.backend_shader_framebuffer_fetch;
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#else
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false;
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#endif
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if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
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{
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bool use_framebuffer_fetch = use_shader_blend || use_shader_logic_op;
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#ifdef __APPLE__
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// Framebuffer fetch is only supported by Metal, so ensure that we're running Vulkan (MoltenVK)
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// if we want to use it.
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if (api_type == APIType::Vulkan)
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{
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if (use_dual_source)
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{
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out.Write("FRAGMENT_OUTPUT_LOCATION_INDEXED(0, 0) out vec4 ocol0;\n"
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"FRAGMENT_OUTPUT_LOCATION_INDEXED(0, 1) out vec4 ocol1;\n");
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}
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else if (use_shader_blend)
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{
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// Metal doesn't support a single unified variable for both input and output, so we declare
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// the output separately. The input will be defined later below.
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out.Write("FRAGMENT_OUTPUT_LOCATION(0) out vec4 real_ocol0;\n");
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}
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else
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{
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out.Write("FRAGMENT_OUTPUT_LOCATION(0) out vec4 ocol0;\n");
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}
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if (use_framebuffer_fetch)
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{
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// Subpass inputs will be converted to framebuffer fetch by SPIRV-Cross.
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out.Write("INPUT_ATTACHMENT_BINDING(0, 0, 0) uniform subpassInput in_ocol0;\n");
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}
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}
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else if (use_dual_source)
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#else
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if (use_dual_source)
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#endif
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{
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if (DriverDetails::HasBug(DriverDetails::BUG_BROKEN_FRAGMENT_SHADER_INDEX_DECORATION))
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{
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@ -1009,11 +1048,16 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
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out.Write("void main()\n{{\n");
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out.Write("\tfloat4 rawpos = gl_FragCoord;\n");
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if (use_shader_blend)
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if (use_framebuffer_fetch)
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{
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// Store off a copy of the initial fb value for blending
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out.Write("\tfloat4 initial_ocol0 = FB_FETCH_VALUE;\n"
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"\tfloat4 ocol0;\n"
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out.Write("\tfloat4 initial_ocol0 = FB_FETCH_VALUE;\n");
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}
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if (use_shader_blend)
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{
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out.Write("\tfloat4 ocol0;\n"
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"\tfloat4 ocol1;\n");
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}
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}
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@ -1264,6 +1308,9 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
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WriteFog(out, uid_data);
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if (use_shader_logic_op)
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WriteLogicOp(out, uid_data);
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// Write the color and alpha values to the framebuffer
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// If using shader blend, we still use the separate alpha
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WriteColor(out, api_type, uid_data, use_dual_source || use_shader_blend);
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@ -1883,6 +1930,34 @@ static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data)
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out.Write("\tprev.rgb = (prev.rgb * (256 - ifog) + " I_FOGCOLOR ".rgb * ifog) >> 8;\n");
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}
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static void WriteLogicOp(ShaderCode& out, const pixel_shader_uid_data* uid_data)
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{
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if (uid_data->logic_op_enable)
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{
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static constexpr std::array<const char*, 16> logic_op_mode{
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"int4(0, 0, 0, 0)", // CLEAR
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"prev & fb_value", // AND
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"prev & ~fb_value", // AND_REVERSE
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"prev", // COPY
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"~prev & fb_value", // AND_INVERTED
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"fb_value", // NOOP
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"prev ^ fb_value", // XOR
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"prev | fb_value", // OR
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"~(prev | fb_value)", // NOR
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"~(prev ^ fb_value)", // EQUIV
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"~fb_value", // INVERT
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"prev | ~fb_value", // OR_REVERSE
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"~prev", // COPY_INVERTED
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"~prev | fb_value", // OR_INVERTED
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"~(prev & fb_value)", // NAND
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"int4(255, 255, 255, 255)", // SET
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};
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out.Write("\tint4 fb_value = iround(initial_ocol0 * 255.0);\n");
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out.Write("\tprev = {};\n", logic_op_mode[uid_data->logic_op_mode]);
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}
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}
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static void WriteColor(ShaderCode& out, APIType api_type, const pixel_shader_uid_data* uid_data,
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bool use_dual_source)
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{
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