gl_rasterizer: Implement render target format RG8_SNORM.

- Used by Super Mario Odyssey.

src/video_core/gpu.cpp

@@ -67,6 +67,7 @@ u32 RenderTargetBytesPerPixel(RenderTargetFormat format) {
     case RenderTargetFormat::R16_UINT:
     case RenderTargetFormat::R16_SINT:
     case RenderTargetFormat::R16_FLOAT:
+    case RenderTargetFormat::RG8_SNORM:
         return 2;
     case RenderTargetFormat::R8_UNORM:
         return 1;

src/video_core/gpu.h

@@ -35,6 +35,7 @@ enum class RenderTargetFormat : u32 {
     R11G11B10_FLOAT = 0xE0,
     R32_FLOAT = 0xE5,
     B5G6R5_UNORM = 0xE8,
+    RG8_SNORM = 0xEB,
     R16_UNORM = 0xEE,
     R16_SNORM = 0xEF,
     R16_SINT = 0xF0,

src/video_core/renderer_opengl/gl_rasterizer_cache.cpp

@@ -133,6 +133,7 @@ static constexpr std::array<FormatTuple, SurfaceParams::MaxPixelFormat> tex_form
     {GL_RG16_SNORM, GL_RG, GL_SHORT, ComponentType::SNorm, false},             // RG16S
     {GL_RGB32F, GL_RGB, GL_FLOAT, ComponentType::Float, false},                // RGB32F
     {GL_SRGB8_ALPHA8, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8_REV, ComponentType::UNorm, false}, // SRGBA8
+    {GL_RG8, GL_RG, GL_BYTE, ComponentType::SNorm, false},                                // RG8S
 
     // DepthStencil formats
     {GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, ComponentType::UNorm,
@@ -249,9 +250,9 @@ static constexpr std::array<void (*)(u32, u32, u32, std::vector<u8>&, Tegra::GPU
         MortonCopy<true, PixelFormat::RG16F>,       MortonCopy<true, PixelFormat::RG16UI>,
         MortonCopy<true, PixelFormat::RG16I>,       MortonCopy<true, PixelFormat::RG16S>,
         MortonCopy<true, PixelFormat::RGB32F>,      MortonCopy<true, PixelFormat::SRGBA8>,
-        MortonCopy<true, PixelFormat::Z24S8>,       MortonCopy<true, PixelFormat::S8Z24>,
-        MortonCopy<true, PixelFormat::Z32F>,        MortonCopy<true, PixelFormat::Z16>,
-        MortonCopy<true, PixelFormat::Z32FS8>,
+        MortonCopy<true, PixelFormat::RG8S>,        MortonCopy<true, PixelFormat::Z24S8>,
+        MortonCopy<true, PixelFormat::S8Z24>,       MortonCopy<true, PixelFormat::Z32F>,
+        MortonCopy<true, PixelFormat::Z16>,         MortonCopy<true, PixelFormat::Z32FS8>,
 };
 
 static constexpr std::array<void (*)(u32, u32, u32, std::vector<u8>&, Tegra::GPUVAddr),
@@ -293,6 +294,7 @@ static constexpr std::array<void (*)(u32, u32, u32, std::vector<u8>&, Tegra::GPU
         MortonCopy<false, PixelFormat::RG16S>,
         MortonCopy<false, PixelFormat::RGB32F>,
         MortonCopy<false, PixelFormat::SRGBA8>,
+        MortonCopy<false, PixelFormat::RG8S>,
         MortonCopy<false, PixelFormat::Z24S8>,
         MortonCopy<false, PixelFormat::S8Z24>,
         MortonCopy<false, PixelFormat::Z32F>,

src/video_core/renderer_opengl/gl_rasterizer_cache.h

@@ -57,15 +57,16 @@ struct SurfaceParams {
         RG16S = 31,
         RGB32F = 32,
         SRGBA8 = 33,
+        RG8S = 34,
 
         MaxColorFormat,
 
         // DepthStencil formats
-        Z24S8 = 34,
-        S8Z24 = 35,
-        Z32F = 36,
-        Z16 = 37,
-        Z32FS8 = 38,
+        Z24S8 = 35,
+        S8Z24 = 36,
+        Z32F = 37,
+        Z16 = 38,
+        Z32FS8 = 39,
 
         MaxDepthStencilFormat,
 
@@ -137,6 +138,7 @@ struct SurfaceParams {
             1, // RG16S
             1, // RGB32F
             1, // SRGBA8
+            1, // RG8S
             1, // Z24S8
             1, // S8Z24
             1, // Z32F
@@ -187,6 +189,7 @@ struct SurfaceParams {
             32,  // RG16S
             96,  // RGB32F
             32,  // SRGBA8
+            16,  // RG8S
             32,  // Z24S8
             32,  // S8Z24
             32,  // Z32F
@@ -257,6 +260,8 @@ struct SurfaceParams {
             return PixelFormat::RG16;
         case Tegra::RenderTargetFormat::RG16_SNORM:
             return PixelFormat::RG16S;
+        case Tegra::RenderTargetFormat::RG8_SNORM:
+            return PixelFormat::RG8S;
         case Tegra::RenderTargetFormat::R16_FLOAT:
             return PixelFormat::R16F;
         case Tegra::RenderTargetFormat::R16_UNORM:
@@ -418,6 +423,7 @@ struct SurfaceParams {
         case Tegra::RenderTargetFormat::RGBA8_SNORM:
         case Tegra::RenderTargetFormat::RG16_SNORM:
         case Tegra::RenderTargetFormat::R16_SNORM:
+        case Tegra::RenderTargetFormat::RG8_SNORM:
             return ComponentType::SNorm;
         case Tegra::RenderTargetFormat::RGBA16_FLOAT:
         case Tegra::RenderTargetFormat::R11G11B10_FLOAT: