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DriverDetails: Add broken discard with early-Z bug on Apple Silicon GPUs
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@ -321,7 +321,9 @@ PixelShaderUid GetPixelShaderUid()
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BlendingState state = {};
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state.Generate(bpmem);
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if (state.usedualsrc && state.dstalpha && g_ActiveConfig.backend_info.bSupportsFramebufferFetch &&
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if (((state.usedualsrc && state.dstalpha) ||
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DriverDetails::HasBug(DriverDetails::BUG_BROKEN_DISCARD_WITH_EARLY_Z)) &&
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g_ActiveConfig.backend_info.bSupportsFramebufferFetch &&
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!g_ActiveConfig.backend_info.bSupportsDualSourceBlend)
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{
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uid_data->blend_enable = state.blendenable;
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@ -944,10 +946,15 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
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(!DriverDetails::HasBug(DriverDetails::BUG_BROKEN_DUAL_SOURCE_BLENDING) ||
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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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!use_dual_source &&
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(uid_data->useDstAlpha ||
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DriverDetails::HasBug(DriverDetails::BUG_BROKEN_DISCARD_WITH_EARLY_Z)) &&
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host_config.backend_shader_framebuffer_fetch;
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const bool use_shader_logic_op = !host_config.backend_logic_op && uid_data->logic_op_enable &&
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host_config.backend_shader_framebuffer_fetch;
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const bool use_framebuffer_fetch = use_shader_blend || use_shader_logic_op;
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const bool use_framebuffer_fetch =
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use_shader_blend || use_shader_logic_op ||
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DriverDetails::HasBug(DriverDetails::BUG_BROKEN_DISCARD_WITH_EARLY_Z);
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if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
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{
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@ -1869,9 +1876,23 @@ static void WriteAlphaTest(ShaderCode& out, const pixel_shader_uid_data* uid_dat
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// ZCOMPLOC HACK:
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if (!uid_data->alpha_test_use_zcomploc_hack)
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{
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out.Write("\t\tdiscard;\n");
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if (api_type == APIType::D3D)
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#ifdef __APPLE__
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if (uid_data->forced_early_z &&
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DriverDetails::HasBug(DriverDetails::BUG_BROKEN_DISCARD_WITH_EARLY_Z))
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{
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// Instead of using discard, fetch the framebuffer's color value and use it as the output
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// for this fragment.
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out.Write("\t\t{} = float4(initial_ocol0.xyz, 1.0);\n",
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use_dual_source ? "real_ocol0" : "ocol0");
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out.Write("\t\treturn;\n");
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}
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else
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#endif
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{
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out.Write("\t\tdiscard;\n");
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if (api_type == APIType::D3D)
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out.Write("\t\treturn;\n");
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}
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}
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out.Write("\t}}\n");
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