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PixelShaderGen: Add shader logic ops support on Metal

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This commit is contained in:
OatmealDome 2021-08-02 23:41:37 -04:00
parent 426c68b5a0
commit e0837cb847
1 changed files with 78 additions and 3 deletions
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81
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -842,6 +842,7 @@ static void WriteTevRegular(ShaderCode& out, std::string_view components, TevBia
static void WriteAlphaTest(ShaderCode& out, const pixel_shader_uid_data* uid_data, APIType api_type,
bool per_pixel_depth, bool use_dual_source);
static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data);
static void WriteLogicOp(ShaderCode& out, const pixel_shader_uid_data* uid_data);
static void WriteColor(ShaderCode& out, APIType api_type, const pixel_shader_uid_data* uid_data,
bool use_dual_source);
static void WriteBlend(ShaderCode& out, const pixel_shader_uid_data* uid_data);
@ -930,10 +931,48 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
uid_data->useDstAlpha);
const bool use_shader_blend =
!use_dual_source && (uid_data->useDstAlpha && host_config.backend_shader_framebuffer_fetch);
const bool use_shader_logic_op =
#ifdef __APPLE__
!host_config.backend_logic_op && host_config.backend_shader_framebuffer_fetch;
#else
false;
#endif
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
{
bool use_framebuffer_fetch = use_shader_blend || use_shader_logic_op;
#ifdef __APPLE__
// Framebuffer fetch is only supported by Metal, so ensure that we're running Vulkan (MoltenVK)
// if we want to use it.
if (api_type == APIType::Vulkan)
{
if (use_dual_source)
{
out.Write("FRAGMENT_OUTPUT_LOCATION_INDEXED(0, 0) out vec4 ocol0;\n"
"FRAGMENT_OUTPUT_LOCATION_INDEXED(0, 1) out vec4 ocol1;\n");
}
else if (use_shader_blend)
{
// Metal doesn't support a single unified variable for both input and output, so we declare
// the output separately. The input will be defined later below.
out.Write("FRAGMENT_OUTPUT_LOCATION(0) out vec4 real_ocol0;\n");
}
else
{
out.Write("FRAGMENT_OUTPUT_LOCATION(0) out vec4 ocol0;\n");
}
if (use_framebuffer_fetch)
{
// Subpass inputs will be converted to framebuffer fetch by SPIRV-Cross.
out.Write("INPUT_ATTACHMENT_BINDING(0, 0, 0) uniform subpassInput in_ocol0;\n");
}
}
else if (use_dual_source)
#else
if (use_dual_source)
#endif
{
if (DriverDetails::HasBug(DriverDetails::BUG_BROKEN_FRAGMENT_SHADER_INDEX_DECORATION))
{
@ -1009,11 +1048,16 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
out.Write("void main()\n{{\n");
out.Write("\tfloat4 rawpos = gl_FragCoord;\n");
if (use_shader_blend)
if (use_framebuffer_fetch)
{
// Store off a copy of the initial fb value for blending
out.Write("\tfloat4 initial_ocol0 = FB_FETCH_VALUE;\n"
"\tfloat4 ocol0;\n"
out.Write("\tfloat4 initial_ocol0 = FB_FETCH_VALUE;\n");
}
if (use_shader_blend)
{
out.Write("\tfloat4 ocol0;\n"
"\tfloat4 ocol1;\n");
}
}
@ -1264,6 +1308,9 @@ ShaderCode GeneratePixelShaderCode(APIType api_type, const ShaderHostConfig& hos
WriteFog(out, uid_data);
if (use_shader_logic_op)
WriteLogicOp(out, uid_data);
// Write the color and alpha values to the framebuffer
// If using shader blend, we still use the separate alpha
WriteColor(out, api_type, uid_data, use_dual_source || use_shader_blend);
@ -1883,6 +1930,34 @@ static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data)
out.Write("\tprev.rgb = (prev.rgb * (256 - ifog) + " I_FOGCOLOR ".rgb * ifog) >> 8;\n");
}
static void WriteLogicOp(ShaderCode& out, const pixel_shader_uid_data* uid_data)
{
if (uid_data->logic_op_enable)
{
static constexpr std::array<const char*, 16> logic_op_mode{
"int4(0, 0, 0, 0)", // CLEAR
"prev & fb_value", // AND
"prev & ~fb_value", // AND_REVERSE
"prev", // COPY
"~prev & fb_value", // AND_INVERTED
"fb_value", // NOOP
"prev ^ fb_value", // XOR
"prev | fb_value", // OR
"~(prev | fb_value)", // NOR
"~(prev ^ fb_value)", // EQUIV
"~fb_value", // INVERT
"prev | ~fb_value", // OR_REVERSE
"~prev", // COPY_INVERTED
"~prev | fb_value", // OR_INVERTED
"~(prev & fb_value)", // NAND
"int4(255, 255, 255, 255)", // SET
};
out.Write("\tint4 fb_value = iround(initial_ocol0 * 255.0);\n");
out.Write("\tprev = {};\n", logic_op_mode[uid_data->logic_op_mode]);
}
}
static void WriteColor(ShaderCode& out, APIType api_type, const pixel_shader_uid_data* uid_data,
bool use_dual_source)
{