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dolphin/Source/Core/VideoCommon/TextureConversionShader.cpp
Stenzek 3847e226ab TextureConversionShader: Consider source format of EFB for EFB2RAM 
Currently, we use the alpha channel from the EFB even if the current
format does not include an alpha channel. Now, the alpha channel is set
to 1 if the format does not have an alpha channel, as well as truncating
to 5/6 bits per channel. This matches the EFB-to-texture behavior.
2017-04-12 00:11:22 +10:00

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// Copyright 2009 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <array>
#include <cmath>
#include <cstdio>
#include <map>
#include <sstream>
#include "Common/CommonFuncs.h"
#include "Common/CommonTypes.h"
#include "Common/MathUtil.h"
#include "Common/MsgHandler.h"
#include "VideoCommon/RenderBase.h"
#include "VideoCommon/TextureConversionShader.h"
#include "VideoCommon/VideoCommon.h"
#define WRITE p += sprintf
static char text[16384];
static bool IntensityConstantAdded = false;
namespace TextureConversionShader
{
u16 GetEncodedSampleCount(u32 format)
{
switch (format)
{
case GX_TF_I4:
return 8;
case GX_TF_I8:
return 4;
case GX_TF_IA4:
return 4;
case GX_TF_IA8:
return 2;
case GX_TF_RGB565:
return 2;
case GX_TF_RGB5A3:
return 2;
case GX_TF_RGBA8:
return 1;
case GX_CTF_R4:
return 8;
case GX_CTF_RA4:
return 4;
case GX_CTF_RA8:
return 2;
case GX_CTF_A8:
return 4;
case GX_CTF_R8:
return 4;
case GX_CTF_G8:
return 4;
case GX_CTF_B8:
return 4;
case GX_CTF_RG8:
return 2;
case GX_CTF_GB8:
return 2;
case GX_TF_Z8:
return 4;
case GX_TF_Z16:
return 2;
case GX_TF_Z24X8:
return 1;
case GX_CTF_Z4:
return 8;
case GX_CTF_Z8M:
return 4;
case GX_CTF_Z8L:
return 4;
case GX_CTF_Z16L:
return 2;
default:
return 1;
}
}
static bool EFBFormatHasAlpha(u32 format)
{
return format == PEControl::RGBA6_Z24;
}
// block dimensions : widthStride, heightStride
// texture dims : width, height, x offset, y offset
static void WriteSwizzler(char*& p, u32 format, APIType ApiType)
{
// left, top, of source rectangle within source texture
// width of the destination rectangle, scale_factor (1 or 2)
if (ApiType == APIType::Vulkan)
WRITE(p, "layout(std140, push_constant) uniform PCBlock { int4 position; } PC;\n");
else
WRITE(p, "uniform int4 position;\n");
int blkW = TexDecoder_GetBlockWidthInTexels(format);
int blkH = TexDecoder_GetBlockHeightInTexels(format);
int samples = GetEncodedSampleCount(format);
if (ApiType == APIType::OpenGL)
{
WRITE(p, "#define samp0 samp9\n");
WRITE(p, "SAMPLER_BINDING(9) uniform sampler2DArray samp0;\n");
WRITE(p, "FRAGMENT_OUTPUT_LOCATION(0) out vec4 ocol0;\n");
WRITE(p, "void main()\n");
WRITE(p, "{\n"
" int2 sampleUv;\n"
" int2 uv1 = int2(gl_FragCoord.xy);\n");
}
else if (ApiType == APIType::Vulkan)
{
WRITE(p, "SAMPLER_BINDING(0) uniform sampler2DArray samp0;\n");
WRITE(p, "FRAGMENT_OUTPUT_LOCATION(0) out vec4 ocol0;\n");
WRITE(p, "void main()\n");
WRITE(p, "{\n"
" int2 sampleUv;\n"
" int2 uv1 = int2(gl_FragCoord.xy);\n"
" int4 position = PC.position;\n");
}
else // D3D
{
WRITE(p, "sampler samp0 : register(s0);\n");
WRITE(p, "Texture2DArray Tex0 : register(t0);\n");
WRITE(p, "void main(\n");
WRITE(p, " out float4 ocol0 : SV_Target, in float4 rawpos : SV_Position)\n");
WRITE(p, "{\n"
" int2 sampleUv;\n"
" int2 uv1 = int2(rawpos.xy);\n");
}
WRITE(p, " int x_block_position = (uv1.x >> %d) << %d;\n", IntLog2(blkH * blkW / samples),
IntLog2(blkW));
WRITE(p, " int y_block_position = uv1.y << %d;\n", IntLog2(blkH));
if (samples == 1)
{
// With samples == 1, we write out pairs of blocks; one A8R8, one G8B8.
WRITE(p, " bool first = (uv1.x & %d) == 0;\n", blkH * blkW / 2);
samples = 2;
}
WRITE(p, " int offset_in_block = uv1.x & %d;\n", (blkH * blkW / samples) - 1);
WRITE(p, " int y_offset_in_block = offset_in_block >> %d;\n", IntLog2(blkW / samples));
WRITE(p, " int x_offset_in_block = (offset_in_block & %d) << %d;\n", (blkW / samples) - 1,
IntLog2(samples));
WRITE(p, " sampleUv.x = x_block_position + x_offset_in_block;\n");
WRITE(p, " sampleUv.y = y_block_position + y_offset_in_block;\n");
WRITE(p,
" float2 uv0 = float2(sampleUv);\n"); // sampleUv is the sample position in (int)gx_coords
WRITE(p, " uv0 += float2(0.5, 0.5);\n"); // move to center of pixel
WRITE(p, " uv0 *= float(position.w);\n"); // scale by two if needed (also move to pixel borders
// so that linear filtering will average adjacent
// pixel)
WRITE(p, " uv0 += float2(position.xy);\n"); // move to copied rect
WRITE(p, " uv0 /= float2(%d, %d);\n", EFB_WIDTH, EFB_HEIGHT); // normalize to [0:1]
if (ApiType == APIType::OpenGL) // ogl has to flip up and down
{
WRITE(p, " uv0.y = 1.0-uv0.y;\n");
}
WRITE(p, " float sample_offset = float(position.w) / float(%d);\n", EFB_WIDTH);
}
static void WriteSampleColor(char*& p, const char* colorComp, const char* dest, int xoffset,
APIType ApiType, const EFBCopyFormat& format, bool depth)
{
if (ApiType == APIType::OpenGL || ApiType == APIType::Vulkan)
{
WRITE(p, " %s = texture(samp0, float3(uv0 + float2(%d, 0) * sample_offset, 0.0)).%s;\n", dest,
xoffset, colorComp);
}
else
{
WRITE(p, " %s = Tex0.Sample(samp0, float3(uv0 + float2(%d, 0) * sample_offset, 0.0)).%s;\n",
dest, xoffset, colorComp);
}
if (ApiType == APIType::D3D || ApiType == APIType::Vulkan)
{
// Handle D3D depth inversion.
if (depth)
WRITE(p, " %s = 1.0 - %s;\n", dest, dest);
}
// Truncate 8-bits to 5/6-bits per channel.
switch (format.efb_format)
{
case PEControl::RGBA6_Z24:
WRITE(p, " %s = floor(%s * 63.0) / 63.0;\n", dest, dest);
break;
case PEControl::RGB565_Z16:
WRITE(
p,
" %s = floor(%s * float4(31.0, 63.0, 31.0, 1.0).%s) / float4(31.0, 63.0, 31.0, 1.0).%s;\n",
dest, dest, colorComp, colorComp);
break;
}
// Alpha channel is set to 1 in the copy if the EFB does not have an alpha channel.
if (std::strchr(colorComp, 'a') && !EFBFormatHasAlpha(format.efb_format))
WRITE(p, " %s.a = 1.0;\n", dest);
}
static void WriteColorToIntensity(char*& p, const char* src, const char* dest)
{
if (!IntensityConstantAdded)
{
WRITE(p, " float4 IntensityConst = float4(0.257f,0.504f,0.098f,0.0625f);\n");
IntensityConstantAdded = true;
}
WRITE(p, " %s = dot(IntensityConst.rgb, %s.rgb);\n", dest, src);
// don't add IntensityConst.a yet, because doing it later is faster and uses less instructions,
// due to vectorization
}
static void WriteToBitDepth(char*& p, u8 depth, const char* src, const char* dest)
{
WRITE(p, " %s = floor(%s * 255.0 / exp2(8.0 - %d.0));\n", dest, src, depth);
}
static void WriteEncoderEnd(char*& p)
{
WRITE(p, "}\n");
IntensityConstantAdded = false;
}
static void WriteI8Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_I8, ApiType);
WRITE(p, " float3 texSample;\n");
WriteSampleColor(p, "rgb", "texSample", 0, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "ocol0.b");
WriteSampleColor(p, "rgb", "texSample", 1, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "ocol0.g");
WriteSampleColor(p, "rgb", "texSample", 2, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "ocol0.r");
WriteSampleColor(p, "rgb", "texSample", 3, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "ocol0.a");
WRITE(p, " ocol0.rgba += IntensityConst.aaaa;\n"); // see WriteColorToIntensity
WriteEncoderEnd(p);
}
static void WriteI4Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_I4, ApiType);
WRITE(p, " float3 texSample;\n");
WRITE(p, " float4 color0;\n");
WRITE(p, " float4 color1;\n");
WriteSampleColor(p, "rgb", "texSample", 0, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "color0.b");
WriteSampleColor(p, "rgb", "texSample", 1, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "color1.b");
WriteSampleColor(p, "rgb", "texSample", 2, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "color0.g");
WriteSampleColor(p, "rgb", "texSample", 3, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "color1.g");
WriteSampleColor(p, "rgb", "texSample", 4, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "color0.r");
WriteSampleColor(p, "rgb", "texSample", 5, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "color1.r");
WriteSampleColor(p, "rgb", "texSample", 6, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "color0.a");
WriteSampleColor(p, "rgb", "texSample", 7, ApiType, format, false);
WriteColorToIntensity(p, "texSample", "color1.a");
WRITE(p, " color0.rgba += IntensityConst.aaaa;\n");
WRITE(p, " color1.rgba += IntensityConst.aaaa;\n");
WriteToBitDepth(p, 4, "color0", "color0");
WriteToBitDepth(p, 4, "color1", "color1");
WRITE(p, " ocol0 = (color0 * 16.0 + color1) / 255.0;\n");
WriteEncoderEnd(p);
}
static void WriteIA8Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_IA8, ApiType);
WRITE(p, " float4 texSample;\n");
WriteSampleColor(p, "rgba", "texSample", 0, ApiType, format, false);
WRITE(p, " ocol0.b = texSample.a;\n");
WriteColorToIntensity(p, "texSample", "ocol0.g");
WriteSampleColor(p, "rgba", "texSample", 1, ApiType, format, false);
WRITE(p, " ocol0.r = texSample.a;\n");
WriteColorToIntensity(p, "texSample", "ocol0.a");
WRITE(p, " ocol0.ga += IntensityConst.aa;\n");
WriteEncoderEnd(p);
}
static void WriteIA4Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_IA4, ApiType);
WRITE(p, " float4 texSample;\n");
WRITE(p, " float4 color0;\n");
WRITE(p, " float4 color1;\n");
WriteSampleColor(p, "rgba", "texSample", 0, ApiType, format, false);
WRITE(p, " color0.b = texSample.a;\n");
WriteColorToIntensity(p, "texSample", "color1.b");
WriteSampleColor(p, "rgba", "texSample", 1, ApiType, format, false);
WRITE(p, " color0.g = texSample.a;\n");
WriteColorToIntensity(p, "texSample", "color1.g");
WriteSampleColor(p, "rgba", "texSample", 2, ApiType, format, false);
WRITE(p, " color0.r = texSample.a;\n");
WriteColorToIntensity(p, "texSample", "color1.r");
WriteSampleColor(p, "rgba", "texSample", 3, ApiType, format, false);
WRITE(p, " color0.a = texSample.a;\n");
WriteColorToIntensity(p, "texSample", "color1.a");
WRITE(p, " color1.rgba += IntensityConst.aaaa;\n");
WriteToBitDepth(p, 4, "color0", "color0");
WriteToBitDepth(p, 4, "color1", "color1");
WRITE(p, " ocol0 = (color0 * 16.0 + color1) / 255.0;\n");
WriteEncoderEnd(p);
}
static void WriteRGB565Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_RGB565, ApiType);
WriteSampleColor(p, "rgb", "float3 texSample0", 0, ApiType, format, false);
WriteSampleColor(p, "rgb", "float3 texSample1", 1, ApiType, format, false);
WRITE(p, " float2 texRs = float2(texSample0.r, texSample1.r);\n");
WRITE(p, " float2 texGs = float2(texSample0.g, texSample1.g);\n");
WRITE(p, " float2 texBs = float2(texSample0.b, texSample1.b);\n");
WriteToBitDepth(p, 6, "texGs", "float2 gInt");
WRITE(p, " float2 gUpper = floor(gInt / 8.0);\n");
WRITE(p, " float2 gLower = gInt - gUpper * 8.0;\n");
WriteToBitDepth(p, 5, "texRs", "ocol0.br");
WRITE(p, " ocol0.br = ocol0.br * 8.0 + gUpper;\n");
WriteToBitDepth(p, 5, "texBs", "ocol0.ga");
WRITE(p, " ocol0.ga = ocol0.ga + gLower * 32.0;\n");
WRITE(p, " ocol0 = ocol0 / 255.0;\n");
WriteEncoderEnd(p);
}
static void WriteRGB5A3Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_RGB5A3, ApiType);
WRITE(p, " float4 texSample;\n");
WRITE(p, " float color0;\n");
WRITE(p, " float gUpper;\n");
WRITE(p, " float gLower;\n");
WriteSampleColor(p, "rgba", "texSample", 0, ApiType, format, false);
// 0.8784 = 224 / 255 which is the maximum alpha value that can be represented in 3 bits
WRITE(p, "if(texSample.a > 0.878f) {\n");
WriteToBitDepth(p, 5, "texSample.g", "color0");
WRITE(p, " gUpper = floor(color0 / 8.0);\n");
WRITE(p, " gLower = color0 - gUpper * 8.0;\n");
WriteToBitDepth(p, 5, "texSample.r", "ocol0.b");
WRITE(p, " ocol0.b = ocol0.b * 4.0 + gUpper + 128.0;\n");
WriteToBitDepth(p, 5, "texSample.b", "ocol0.g");
WRITE(p, " ocol0.g = ocol0.g + gLower * 32.0;\n");
WRITE(p, "} else {\n");
WriteToBitDepth(p, 4, "texSample.r", "ocol0.b");
WriteToBitDepth(p, 4, "texSample.b", "ocol0.g");
WriteToBitDepth(p, 3, "texSample.a", "color0");
WRITE(p, "ocol0.b = ocol0.b + color0 * 16.0;\n");
WriteToBitDepth(p, 4, "texSample.g", "color0");
WRITE(p, "ocol0.g = ocol0.g + color0 * 16.0;\n");
WRITE(p, "}\n");
WriteSampleColor(p, "rgba", "texSample", 1, ApiType, format, false);
WRITE(p, " texSample.a = 1.0;\n");
WRITE(p, "if(texSample.a > 0.878f) {\n");
WriteToBitDepth(p, 5, "texSample.g", "color0");
WRITE(p, " gUpper = floor(color0 / 8.0);\n");
WRITE(p, " gLower = color0 - gUpper * 8.0;\n");
WriteToBitDepth(p, 5, "texSample.r", "ocol0.r");
WRITE(p, " ocol0.r = ocol0.r * 4.0 + gUpper + 128.0;\n");
WriteToBitDepth(p, 5, "texSample.b", "ocol0.a");
WRITE(p, " ocol0.a = ocol0.a + gLower * 32.0;\n");
WRITE(p, "} else {\n");
WriteToBitDepth(p, 4, "texSample.r", "ocol0.r");
WriteToBitDepth(p, 4, "texSample.b", "ocol0.a");
WriteToBitDepth(p, 3, "texSample.a", "color0");
WRITE(p, "ocol0.r = ocol0.r + color0 * 16.0;\n");
WriteToBitDepth(p, 4, "texSample.g", "color0");
WRITE(p, "ocol0.a = ocol0.a + color0 * 16.0;\n");
WRITE(p, "}\n");
WRITE(p, " ocol0 = ocol0 / 255.0;\n");
WriteEncoderEnd(p);
}
static void WriteRGBA8Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_RGBA8, ApiType);
WRITE(p, " float4 texSample;\n");
WRITE(p, " float4 color0;\n");
WRITE(p, " float4 color1;\n");
WriteSampleColor(p, "rgba", "texSample", 0, ApiType, format, false);
WRITE(p, " color0.b = texSample.a;\n");
WRITE(p, " color0.g = texSample.r;\n");
WRITE(p, " color1.b = texSample.g;\n");
WRITE(p, " color1.g = texSample.b;\n");
WriteSampleColor(p, "rgba", "texSample", 1, ApiType, format, false);
WRITE(p, " color0.r = texSample.a;\n");
WRITE(p, " color0.a = texSample.r;\n");
WRITE(p, " color1.r = texSample.g;\n");
WRITE(p, " color1.a = texSample.b;\n");
WRITE(p, " ocol0 = first ? color0 : color1;\n");
WriteEncoderEnd(p);
}
static void WriteC4Encoder(char*& p, const char* comp, APIType ApiType, const EFBCopyFormat& format,
bool depth)
{
WriteSwizzler(p, GX_CTF_R4, ApiType);
WRITE(p, " float4 color0;\n");
WRITE(p, " float4 color1;\n");
WriteSampleColor(p, comp, "color0.b", 0, ApiType, format, depth);
WriteSampleColor(p, comp, "color1.b", 1, ApiType, format, depth);
WriteSampleColor(p, comp, "color0.g", 2, ApiType, format, depth);
WriteSampleColor(p, comp, "color1.g", 3, ApiType, format, depth);
WriteSampleColor(p, comp, "color0.r", 4, ApiType, format, depth);
WriteSampleColor(p, comp, "color1.r", 5, ApiType, format, depth);
WriteSampleColor(p, comp, "color0.a", 6, ApiType, format, depth);
WriteSampleColor(p, comp, "color1.a", 7, ApiType, format, depth);
WriteToBitDepth(p, 4, "color0", "color0");
WriteToBitDepth(p, 4, "color1", "color1");
WRITE(p, " ocol0 = (color0 * 16.0 + color1) / 255.0;\n");
WriteEncoderEnd(p);
}
static void WriteC8Encoder(char*& p, const char* comp, APIType ApiType, const EFBCopyFormat& format,
bool depth)
{
WriteSwizzler(p, GX_CTF_R8, ApiType);
WriteSampleColor(p, comp, "ocol0.b", 0, ApiType, format, depth);
WriteSampleColor(p, comp, "ocol0.g", 1, ApiType, format, depth);
WriteSampleColor(p, comp, "ocol0.r", 2, ApiType, format, depth);
WriteSampleColor(p, comp, "ocol0.a", 3, ApiType, format, depth);
WriteEncoderEnd(p);
}
static void WriteCC4Encoder(char*& p, const char* comp, APIType ApiType,
const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_CTF_RA4, ApiType);
WRITE(p, " float2 texSample;\n");
WRITE(p, " float4 color0;\n");
WRITE(p, " float4 color1;\n");
WriteSampleColor(p, comp, "texSample", 0, ApiType, format, false);
WRITE(p, " color0.b = texSample.x;\n");
WRITE(p, " color1.b = texSample.y;\n");
WriteSampleColor(p, comp, "texSample", 1, ApiType, format, false);
WRITE(p, " color0.g = texSample.x;\n");
WRITE(p, " color1.g = texSample.y;\n");
WriteSampleColor(p, comp, "texSample", 2, ApiType, format, false);
WRITE(p, " color0.r = texSample.x;\n");
WRITE(p, " color1.r = texSample.y;\n");
WriteSampleColor(p, comp, "texSample", 3, ApiType, format, false);
WRITE(p, " color0.a = texSample.x;\n");
WRITE(p, " color1.a = texSample.y;\n");
WriteToBitDepth(p, 4, "color0", "color0");
WriteToBitDepth(p, 4, "color1", "color1");
WRITE(p, " ocol0 = (color0 * 16.0 + color1) / 255.0;\n");
WriteEncoderEnd(p);
}
static void WriteCC8Encoder(char*& p, const char* comp, APIType ApiType,
const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_CTF_RA8, ApiType);
WriteSampleColor(p, comp, "ocol0.bg", 0, ApiType, format, false);
WriteSampleColor(p, comp, "ocol0.ra", 1, ApiType, format, false);
WriteEncoderEnd(p);
}
static void WriteZ8Encoder(char*& p, const char* multiplier, APIType ApiType,
const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_CTF_Z8M, ApiType);
WRITE(p, " float depth;\n");
WriteSampleColor(p, "r", "depth", 0, ApiType, format, true);
WRITE(p, "ocol0.b = frac(depth * %s);\n", multiplier);
WriteSampleColor(p, "r", "depth", 1, ApiType, format, true);
WRITE(p, "ocol0.g = frac(depth * %s);\n", multiplier);
WriteSampleColor(p, "r", "depth", 2, ApiType, format, true);
WRITE(p, "ocol0.r = frac(depth * %s);\n", multiplier);
WriteSampleColor(p, "r", "depth", 3, ApiType, format, true);
WRITE(p, "ocol0.a = frac(depth * %s);\n", multiplier);
WriteEncoderEnd(p);
}
static void WriteZ16Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_Z16, ApiType);
WRITE(p, " float depth;\n");
WRITE(p, " float3 expanded;\n");
// byte order is reversed
WriteSampleColor(p, "r", "depth", 0, ApiType, format, true);
WRITE(p, " depth *= 16777216.0;\n");
WRITE(p, " expanded.r = floor(depth / (256.0 * 256.0));\n");
WRITE(p, " depth -= expanded.r * 256.0 * 256.0;\n");
WRITE(p, " expanded.g = floor(depth / 256.0);\n");
WRITE(p, " ocol0.b = expanded.g / 255.0;\n");
WRITE(p, " ocol0.g = expanded.r / 255.0;\n");
WriteSampleColor(p, "r", "depth", 1, ApiType, format, true);
WRITE(p, " depth *= 16777216.0;\n");
WRITE(p, " expanded.r = floor(depth / (256.0 * 256.0));\n");
WRITE(p, " depth -= expanded.r * 256.0 * 256.0;\n");
WRITE(p, " expanded.g = floor(depth / 256.0);\n");
WRITE(p, " ocol0.r = expanded.g / 255.0;\n");
WRITE(p, " ocol0.a = expanded.r / 255.0;\n");
WriteEncoderEnd(p);
}
static void WriteZ16LEncoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_CTF_Z16L, ApiType);
WRITE(p, " float depth;\n");
WRITE(p, " float3 expanded;\n");
// byte order is reversed
WriteSampleColor(p, "r", "depth", 0, ApiType, format, true);
WRITE(p, " depth *= 16777216.0;\n");
WRITE(p, " expanded.r = floor(depth / (256.0 * 256.0));\n");
WRITE(p, " depth -= expanded.r * 256.0 * 256.0;\n");
WRITE(p, " expanded.g = floor(depth / 256.0);\n");
WRITE(p, " depth -= expanded.g * 256.0;\n");
WRITE(p, " expanded.b = depth;\n");
WRITE(p, " ocol0.b = expanded.b / 255.0;\n");
WRITE(p, " ocol0.g = expanded.g / 255.0;\n");
WriteSampleColor(p, "r", "depth", 1, ApiType, format, true);
WRITE(p, " depth *= 16777216.0;\n");
WRITE(p, " expanded.r = floor(depth / (256.0 * 256.0));\n");
WRITE(p, " depth -= expanded.r * 256.0 * 256.0;\n");
WRITE(p, " expanded.g = floor(depth / 256.0);\n");
WRITE(p, " depth -= expanded.g * 256.0;\n");
WRITE(p, " expanded.b = depth;\n");
WRITE(p, " ocol0.r = expanded.b / 255.0;\n");
WRITE(p, " ocol0.a = expanded.g / 255.0;\n");
WriteEncoderEnd(p);
}
static void WriteZ24Encoder(char*& p, APIType ApiType, const EFBCopyFormat& format)
{
WriteSwizzler(p, GX_TF_Z24X8, ApiType);
WRITE(p, " float depth0;\n");
WRITE(p, " float depth1;\n");
WRITE(p, " float3 expanded0;\n");
WRITE(p, " float3 expanded1;\n");
WriteSampleColor(p, "r", "depth0", 0, ApiType, format, true);
WriteSampleColor(p, "r", "depth1", 1, ApiType, format, true);
for (int i = 0; i < 2; i++)
{
WRITE(p, " depth%i *= 16777216.0;\n", i);
WRITE(p, " expanded%i.r = floor(depth%i / (256.0 * 256.0));\n", i, i);
WRITE(p, " depth%i -= expanded%i.r * 256.0 * 256.0;\n", i, i);
WRITE(p, " expanded%i.g = floor(depth%i / 256.0);\n", i, i);
WRITE(p, " depth%i -= expanded%i.g * 256.0;\n", i, i);
WRITE(p, " expanded%i.b = depth%i;\n", i, i);
}
WRITE(p, " if (!first) {\n");
// upper 16
WRITE(p, " ocol0.b = expanded0.g / 255.0;\n");
WRITE(p, " ocol0.g = expanded0.b / 255.0;\n");
WRITE(p, " ocol0.r = expanded1.g / 255.0;\n");
WRITE(p, " ocol0.a = expanded1.b / 255.0;\n");
WRITE(p, " } else {\n");
// lower 8
WRITE(p, " ocol0.b = 1.0;\n");
WRITE(p, " ocol0.g = expanded0.r / 255.0;\n");
WRITE(p, " ocol0.r = 1.0;\n");
WRITE(p, " ocol0.a = expanded1.r / 255.0;\n");
WRITE(p, " }\n");
WriteEncoderEnd(p);
}
const char* GenerateEncodingShader(const EFBCopyFormat& format, APIType api_type)
{
text[sizeof(text) - 1] = 0x7C; // canary
char* p = text;
switch (format.copy_format)
{
case GX_TF_I4:
WriteI4Encoder(p, api_type, format);
break;
case GX_TF_I8:
WriteI8Encoder(p, api_type, format);
break;
case GX_TF_IA4:
WriteIA4Encoder(p, api_type, format);
break;
case GX_TF_IA8:
WriteIA8Encoder(p, api_type, format);
break;
case GX_TF_RGB565:
WriteRGB565Encoder(p, api_type, format);
break;
case GX_TF_RGB5A3:
WriteRGB5A3Encoder(p, api_type, format);
break;
case GX_TF_RGBA8:
WriteRGBA8Encoder(p, api_type, format);
break;
case GX_CTF_R4:
WriteC4Encoder(p, "r", api_type, format, false);
break;
case GX_CTF_RA4:
WriteCC4Encoder(p, "ar", api_type, format);
break;
case GX_CTF_RA8:
WriteCC8Encoder(p, "ar", api_type, format);
break;
case GX_CTF_A8:
WriteC8Encoder(p, "a", api_type, format, false);
break;
case GX_CTF_R8:
WriteC8Encoder(p, "r", api_type, format, false);
break;
case GX_CTF_G8:
WriteC8Encoder(p, "g", api_type, format, false);
break;
case GX_CTF_B8:
WriteC8Encoder(p, "b", api_type, format, false);
break;
case GX_CTF_RG8:
WriteCC8Encoder(p, "rg", api_type, format);
break;
case GX_CTF_GB8:
WriteCC8Encoder(p, "gb", api_type, format);
break;
case GX_CTF_Z8H:
case GX_TF_Z8:
WriteC8Encoder(p, "r", api_type, format, true);
break;
case GX_CTF_Z16R:
case GX_TF_Z16:
WriteZ16Encoder(p, api_type, format);
break;
case GX_TF_Z24X8:
WriteZ24Encoder(p, api_type, format);
break;
case GX_CTF_Z4:
WriteC4Encoder(p, "r", api_type, format, true);
break;
case GX_CTF_Z8M:
WriteZ8Encoder(p, "256.0", api_type, format);
break;
case GX_CTF_Z8L:
WriteZ8Encoder(p, "65536.0", api_type, format);
break;
case GX_CTF_Z16L:
WriteZ16LEncoder(p, api_type, format);
break;
default:
PanicAlert("Unknown texture copy format: 0x%x\n", static_cast<u32>(format.copy_format));
break;
}
if (text[sizeof(text) - 1] != 0x7C)
PanicAlert("TextureConversionShader generator - buffer too small, canary has been eaten!");
return text;
}
// NOTE: In these uniforms, a row refers to a row of blocks, not texels.
static const char decoding_shader_header[] = R"(
#ifdef VULKAN
layout(std140, push_constant) uniform PushConstants {
uvec2 dst_size;
uvec2 src_size;
uint src_offset;
uint src_row_stride;
uint palette_offset;
} push_constants;
#define u_dst_size (push_constants.dst_size)
#define u_src_size (push_constants.src_size)
#define u_src_offset (push_constants.src_offset)
#define u_src_row_stride (push_constants.src_row_stride)
#define u_palette_offset (push_constants.palette_offset)
TEXEL_BUFFER_BINDING(0) uniform usamplerBuffer s_input_buffer;
TEXEL_BUFFER_BINDING(1) uniform usamplerBuffer s_palette_buffer;
IMAGE_BINDING(rgba8, 0) uniform writeonly image2DArray output_image;
#else
uniform uvec2 u_dst_size;
uniform uvec2 u_src_size;
uniform uint u_src_offset;
uniform uint u_src_row_stride;
uniform uint u_palette_offset;
SAMPLER_BINDING(9) uniform usamplerBuffer s_input_buffer;
SAMPLER_BINDING(10) uniform usamplerBuffer s_palette_buffer;
layout(rgba8, binding = 0) uniform writeonly image2DArray output_image;
#endif
uint Swap16(uint v)
{
// Convert BE to LE.
return ((v >> 8) | (v << 8)) & 0xFFFFu;
}
uint Convert3To8(uint v)
{
// Swizzle bits: 00000123 -> 12312312
return (v << 5) | (v << 2) | (v >> 1);
}
uint Convert4To8(uint v)
{
// Swizzle bits: 00001234 -> 12341234
return (v << 4) | v;
}
uint Convert5To8(uint v)
{
// Swizzle bits: 00012345 -> 12345123
return (v << 3) | (v >> 2);
}
uint Convert6To8(uint v)
{
// Swizzle bits: 00123456 -> 12345612
return (v << 2) | (v >> 4);
}
uint GetTiledTexelOffset(uvec2 block_size, uvec2 coords)
{
uvec2 block = coords / block_size;
uvec2 offset = coords % block_size;
uint buffer_pos = u_src_offset;
buffer_pos += block.y * u_src_row_stride;
buffer_pos += block.x * (block_size.x * block_size.y);
buffer_pos += offset.y * block_size.x;
buffer_pos += offset.x;
return buffer_pos;
}
uvec4 GetPaletteColor(uint index)
{
// Fetch and swap BE to LE.
uint val = Swap16(texelFetch(s_palette_buffer, int(u_palette_offset + index)).x);
uvec4 color;
#if defined(PALETTE_FORMAT_IA8)
uint a = bitfieldExtract(val, 8, 8);
uint i = bitfieldExtract(val, 0, 8);
color = uvec4(i, i, i, a);
#elif defined(PALETTE_FORMAT_RGB565)
color.x = Convert5To8(bitfieldExtract(val, 11, 5));
color.y = Convert6To8(bitfieldExtract(val, 5, 6));
color.z = Convert5To8(bitfieldExtract(val, 0, 5));
color.a = 255u;
#elif defined(PALETTE_FORMAT_RGB5A3)
if ((val & 0x8000u) != 0u)
{
color.x = Convert5To8(bitfieldExtract(val, 10, 5));
color.y = Convert5To8(bitfieldExtract(val, 5, 5));
color.z = Convert5To8(bitfieldExtract(val, 0, 5));
color.a = 255u;
}
else
{
color.a = Convert3To8(bitfieldExtract(val, 12, 3));
color.r = Convert4To8(bitfieldExtract(val, 8, 4));
color.g = Convert4To8(bitfieldExtract(val, 4, 4));
color.b = Convert4To8(bitfieldExtract(val, 0, 4));
}
#else
// Not used.
color = uvec4(0, 0, 0, 0);
#endif
return color;
}
vec4 GetPaletteColorNormalized(uint index)
{
uvec4 color = GetPaletteColor(index);
return vec4(color) / 255.0;
}
)";
static const std::map<TextureFormat, DecodingShaderInfo> s_decoding_shader_info{
{GX_TF_I4,
{BUFFER_FORMAT_R8_UINT, 0, 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 8x8 blocks, 4 bits per pixel
// We need to do the tiling manually here because the texel size is smaller than
// the size of the buffer elements.
uint2 block = coords.xy / 8u;
uint2 offset = coords.xy % 8u;
uint buffer_pos = u_src_offset;
buffer_pos += block.y * u_src_row_stride;
buffer_pos += block.x * 32u;
buffer_pos += offset.y * 4u;
buffer_pos += offset.x / 2u;
// Select high nibble for odd texels, low for even.
uint val = texelFetch(s_input_buffer, int(buffer_pos)).x;
uint i;
if ((coords.x & 1u) == 0u)
i = Convert4To8((val >> 4));
else
i = Convert4To8((val & 0x0Fu));
uvec4 color = uvec4(i, i, i, i);
vec4 norm_color = vec4(color) / 255.0;
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_IA4,
{BUFFER_FORMAT_R8_UINT, 0, 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 8x4 blocks, 8 bits per pixel
uint buffer_pos = GetTiledTexelOffset(uvec2(8u, 4u), coords);
uint val = texelFetch(s_input_buffer, int(buffer_pos)).x;
uint i = Convert4To8((val & 0x0Fu));
uint a = Convert4To8((val >> 4));
uvec4 color = uvec4(i, i, i, a);
vec4 norm_color = vec4(color) / 255.0;
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_I8,
{BUFFER_FORMAT_R8_UINT, 0, 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 8x4 blocks, 8 bits per pixel
uint buffer_pos = GetTiledTexelOffset(uvec2(8u, 4u), coords);
uint i = texelFetch(s_input_buffer, int(buffer_pos)).x;
uvec4 color = uvec4(i, i, i, i);
vec4 norm_color = vec4(color) / 255.0;
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_IA8,
{BUFFER_FORMAT_R16_UINT, 0, 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 4x4 blocks, 16 bits per pixel
uint buffer_pos = GetTiledTexelOffset(uvec2(4u, 4u), coords);
uint val = texelFetch(s_input_buffer, int(buffer_pos)).x;
uint a = (val & 0xFFu);
uint i = (val >> 8);
uvec4 color = uvec4(i, i, i, a);
vec4 norm_color = vec4(color) / 255.0;
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_RGB565,
{BUFFER_FORMAT_R16_UINT, 0, 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 4x4 blocks
uint buffer_pos = GetTiledTexelOffset(uvec2(4u, 4u), coords);
uint val = Swap16(texelFetch(s_input_buffer, int(buffer_pos)).x);
uvec4 color;
color.x = Convert5To8(bitfieldExtract(val, 11, 5));
color.y = Convert6To8(bitfieldExtract(val, 5, 6));
color.z = Convert5To8(bitfieldExtract(val, 0, 5));
color.a = 255u;
vec4 norm_color = vec4(color) / 255.0;
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_RGB5A3,
{BUFFER_FORMAT_R16_UINT, 0, 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 4x4 blocks
uint buffer_pos = GetTiledTexelOffset(uvec2(4u, 4u), coords);
uint val = Swap16(texelFetch(s_input_buffer, int(buffer_pos)).x);
uvec4 color;
if ((val & 0x8000u) != 0u)
{
color.x = Convert5To8(bitfieldExtract(val, 10, 5));
color.y = Convert5To8(bitfieldExtract(val, 5, 5));
color.z = Convert5To8(bitfieldExtract(val, 0, 5));
color.a = 255u;
}
else
{
color.a = Convert3To8(bitfieldExtract(val, 12, 3));
color.r = Convert4To8(bitfieldExtract(val, 8, 4));
color.g = Convert4To8(bitfieldExtract(val, 4, 4));
color.b = Convert4To8(bitfieldExtract(val, 0, 4));
}
vec4 norm_color = vec4(color) / 255.0;
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_RGBA8,
{BUFFER_FORMAT_R16_UINT, 0, 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 4x4 blocks
// We can't use the normal calculation function, as these are packed as the AR channels
// for the entire block, then the GB channels afterwards.
uint2 block = coords.xy / 4u;
uint2 offset = coords.xy % 4u;
uint buffer_pos = u_src_offset;
// Our buffer has 16-bit elements, so the offsets here are half what they would be in bytes.
buffer_pos += block.y * u_src_row_stride;
buffer_pos += block.x * 32u;
buffer_pos += offset.y * 4u;
buffer_pos += offset.x;
// The two GB channels follow after the block's AR channels.
uint val1 = texelFetch(s_input_buffer, int(buffer_pos + 0u)).x;
uint val2 = texelFetch(s_input_buffer, int(buffer_pos + 16u)).x;
uvec4 color;
color.a = (val1 & 0xFFu);
color.r = (val1 >> 8);
color.g = (val2 & 0xFFu);
color.b = (val2 >> 8);
vec4 norm_color = vec4(color) / 255.0;
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_CMPR,
{BUFFER_FORMAT_R32G32_UINT, 0, 64, 1, true,
R"(
// In the compute version of this decoder, we flatten the blocks to a one-dimension array.
// Each group is subdivided into 16, and the first thread in each group fetches the DXT data.
// All threads then calculate the possible colors for the block and write to the output image.
#define GROUP_SIZE 64u
#define BLOCK_SIZE_X 4u
#define BLOCK_SIZE_Y 4u
#define BLOCK_SIZE (BLOCK_SIZE_X * BLOCK_SIZE_Y)
#define BLOCKS_PER_GROUP (GROUP_SIZE / BLOCK_SIZE)
layout(local_size_x = GROUP_SIZE, local_size_y = 1) in;
shared uvec2 shared_temp[BLOCKS_PER_GROUP];
uint DXTBlend(uint v1, uint v2)
{
// 3/8 blend, which is close to 1/3
return ((v1 * 3u + v2 * 5u) >> 3);
}
void main()
{
uint local_thread_id = gl_LocalInvocationID.x;
uint block_in_group = local_thread_id / BLOCK_SIZE;
uint thread_in_block = local_thread_id % BLOCK_SIZE;
uint block_index = gl_WorkGroupID.x * BLOCKS_PER_GROUP + block_in_group;
// Annoyingly, we can't precalculate this as a uniform because the DXT block size differs
// from the block size of the overall texture (4 vs 8). We can however use a multiply and
// subtraction to avoid the modulo for calculating the block's X coordinate.
uint blocks_wide = u_src_size.x / BLOCK_SIZE_X;
uvec2 block_coords;
block_coords.y = block_index / blocks_wide;
block_coords.x = block_index - (block_coords.y * blocks_wide);
// Only the first thread for each block reads from the texel buffer.
if (thread_in_block == 0u)
{
// Calculate tiled block coordinates.
uvec2 tile_block_coords = block_coords / 2u;
uvec2 subtile_block_coords = block_coords % 2u;
uint buffer_pos = u_src_offset;
buffer_pos += tile_block_coords.y * u_src_row_stride;
buffer_pos += tile_block_coords.x * 4u;
buffer_pos += subtile_block_coords.y * 2u;
buffer_pos += subtile_block_coords.x;
// Read the entire DXT block to shared memory.
uvec2 raw_data = texelFetch(s_input_buffer, int(buffer_pos)).xy;
shared_temp[block_in_group] = raw_data;
}
// Ensure store is completed before the remaining threads in the block continue.
memoryBarrierShared();
barrier();
// Unpack colors and swap BE to LE.
uvec2 raw_data = shared_temp[block_in_group];
uint swapped = ((raw_data.x & 0xFF00FF00u) >> 8) | ((raw_data.x & 0x00FF00FFu) << 8);
uint c1 = swapped & 0xFFFFu;
uint c2 = swapped >> 16;
// Expand 5/6 bit channels to 8-bits per channel.
uint blue1 = Convert5To8(bitfieldExtract(c1, 0, 5));
uint blue2 = Convert5To8(bitfieldExtract(c2, 0, 5));
uint green1 = Convert6To8(bitfieldExtract(c1, 5, 6));
uint green2 = Convert6To8(bitfieldExtract(c2, 5, 6));
uint red1 = Convert5To8(bitfieldExtract(c1, 11, 5));
uint red2 = Convert5To8(bitfieldExtract(c2, 11, 5));
// Determine the four colors the block can use.
// It's quicker to just precalculate all four colors rather than branching on the index.
// NOTE: These must be masked with 0xFF. This is done at the normalization stage below.
uvec4 color0, color1, color2, color3;
color0 = uvec4(red1, green1, blue1, 255u);
color1 = uvec4(red2, green2, blue2, 255u);
if (c1 > c2)
{
color2 = uvec4(DXTBlend(red2, red1), DXTBlend(green2, green1), DXTBlend(blue2, blue1), 255u);
color3 = uvec4(DXTBlend(red1, red2), DXTBlend(green1, green2), DXTBlend(blue1, blue2), 255u);
}
else
{
color2 = uvec4((red1 + red2) / 2u, (green1 + green2) / 2u, (blue1 + blue2) / 2u, 255u);
color3 = uvec4((red1 + red2) / 2u, (green1 + green2) / 2u, (blue1 + blue2) / 2u, 0u);
}
// Calculate the texel coordinates that we will write to.
// The divides/modulo here should be turned into a shift/binary AND.
uint local_y = thread_in_block / BLOCK_SIZE_X;
uint local_x = thread_in_block % BLOCK_SIZE_X;
uint global_x = block_coords.x * BLOCK_SIZE_X + local_x;
uint global_y = block_coords.y * BLOCK_SIZE_Y + local_y;
// Use the coordinates within the block to shift the 32-bit value containing
// all 16 indices to a single 2-bit index.
uint index = bitfieldExtract(raw_data.y, int((local_y * 8u) + (6u - local_x * 2u)), 2);
// Select the un-normalized color from the precalculated color array.
// Using a switch statement here removes the need for dynamic indexing of an array.
uvec4 color;
switch (index)
{
case 0u: color = color0; break;
case 1u: color = color1; break;
case 2u: color = color2; break;
case 3u: color = color3; break;
default: color = color0; break;
}
// Normalize and write to the output image.
vec4 norm_color = vec4(color & 0xFFu) / 255.0;
imageStore(output_image, ivec3(ivec2(uvec2(global_x, global_y)), 0), norm_color);
}
)"}},
{GX_TF_C4,
{BUFFER_FORMAT_R8_UINT, static_cast<u32>(TexDecoder_GetPaletteSize(GX_TF_C4)), 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 8x8 blocks, 4 bits per pixel
// We need to do the tiling manually here because the texel size is smaller than
// the size of the buffer elements.
uint2 block = coords.xy / 8u;
uint2 offset = coords.xy % 8u;
uint buffer_pos = u_src_offset;
buffer_pos += block.y * u_src_row_stride;
buffer_pos += block.x * 32u;
buffer_pos += offset.y * 4u;
buffer_pos += offset.x / 2u;
// Select high nibble for odd texels, low for even.
uint val = texelFetch(s_input_buffer, int(buffer_pos)).x;
uint index = ((coords.x & 1u) == 0u) ? (val >> 4) : (val & 0x0Fu);
vec4 norm_color = GetPaletteColorNormalized(index);
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_C8,
{BUFFER_FORMAT_R8_UINT, static_cast<u32>(TexDecoder_GetPaletteSize(GX_TF_C8)), 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 8x4 blocks, 8 bits per pixel
uint buffer_pos = GetTiledTexelOffset(uvec2(8u, 4u), coords);
uint index = texelFetch(s_input_buffer, int(buffer_pos)).x;
vec4 norm_color = GetPaletteColorNormalized(index);
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}},
{GX_TF_C14X2,
{BUFFER_FORMAT_R16_UINT, static_cast<u32>(TexDecoder_GetPaletteSize(GX_TF_C14X2)), 8, 8, false,
R"(
layout(local_size_x = 8, local_size_y = 8) in;
void main()
{
uvec2 coords = gl_GlobalInvocationID.xy;
// Tiled in 4x4 blocks, 16 bits per pixel
uint buffer_pos = GetTiledTexelOffset(uvec2(4u, 4u), coords);
uint index = Swap16(texelFetch(s_input_buffer, int(buffer_pos)).x) & 0x3FFFu;
vec4 norm_color = GetPaletteColorNormalized(index);
imageStore(output_image, ivec3(ivec2(coords), 0), norm_color);
}
)"}}};
static const std::array<u32, BUFFER_FORMAT_COUNT> s_buffer_bytes_per_texel = {{
1, // BUFFER_FORMAT_R8_UINT
2, // BUFFER_FORMAT_R16_UINT
8, // BUFFER_FORMAT_R32G32_UINT
}};
const DecodingShaderInfo* GetDecodingShaderInfo(TextureFormat format)
{
auto iter = s_decoding_shader_info.find(format);
return iter != s_decoding_shader_info.end() ? &iter->second : nullptr;
}
u32 GetBytesPerBufferElement(BufferFormat buffer_format)
{
return s_buffer_bytes_per_texel[buffer_format];
}
std::pair<u32, u32> GetDispatchCount(const DecodingShaderInfo* info, u32 width, u32 height)
{
// Flatten to a single dimension?
if (info->group_flatten)
return {(width * height + (info->group_size_x - 1)) / info->group_size_x, 1};
return {(width + (info->group_size_x - 1)) / info->group_size_x,
(height + (info->group_size_y - 1)) / info->group_size_y};
}
std::string GenerateDecodingShader(TextureFormat format, TlutFormat palette_format,
APIType api_type)
{
const DecodingShaderInfo* info = GetDecodingShaderInfo(format);
if (!info)
return "";
std::stringstream ss;
switch (palette_format)
{
case GX_TL_IA8:
ss << "#define PALETTE_FORMAT_IA8 1\n";
break;
case GX_TL_RGB565:
ss << "#define PALETTE_FORMAT_RGB565 1\n";
break;
case GX_TL_RGB5A3:
ss << "#define PALETTE_FORMAT_RGB5A3 1\n";
break;
}
ss << decoding_shader_header;
ss << info->shader_body;
return ss.str();
}
} // namespace
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