Merge pull request #814 from Subv/rt_r8

GPU: Allow the usage of R8 as a render target format.

src/video_core/gpu.h

@@ -24,6 +24,7 @@ enum class RenderTargetFormat : u32 {
     RGBA8_UNORM = 0xD5,
     RGBA8_SRGB = 0xD6,
     R11G11B10_FLOAT = 0xE0,
+    R8_UNORM = 0xF3,
 };
 
 enum class DepthFormat : u32 {

src/video_core/renderer_opengl/gl_rasterizer_cache.h

@@ -194,6 +194,8 @@ struct SurfaceParams {
             return PixelFormat::R11FG11FB10F;
         case Tegra::RenderTargetFormat::RGBA32_UINT:
             return PixelFormat::RGBA32UI;
+        case Tegra::RenderTargetFormat::R8_UNORM:
+            return PixelFormat::R8;
         default:
             LOG_CRITICAL(HW_GPU, "Unimplemented format={}", static_cast<u32>(format));
             UNREACHABLE();
@@ -351,6 +353,7 @@ struct SurfaceParams {
         case Tegra::RenderTargetFormat::RGBA8_SRGB:
         case Tegra::RenderTargetFormat::BGRA8_UNORM:
         case Tegra::RenderTargetFormat::RGB10_A2_UNORM:
+        case Tegra::RenderTargetFormat::R8_UNORM:
             return ComponentType::UNorm;
         case Tegra::RenderTargetFormat::RGBA16_FLOAT:
         case Tegra::RenderTargetFormat::R11G11B10_FLOAT: