From 99f9d47d16aaa943d952ab4b0a46837b2685aed2 Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Sat, 2 Jun 2018 13:17:09 -0500
Subject: GPU: Implemented the DXN1 (BC4) texture format.

---
 src/video_core/renderer_opengl/gl_rasterizer_cache.cpp | 6 ++++--
 src/video_core/renderer_opengl/gl_rasterizer_cache.h   | 7 +++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

(limited to 'src/video_core/renderer_opengl')

diff --git a/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp b/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
index 10a460a82..65d643447 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer_cache.cpp
@@ -53,6 +53,7 @@ static constexpr std::array<FormatTuple, SurfaceParams::MaxPixelFormat> tex_form
     {GL_COMPRESSED_RGB_S3TC_DXT1_EXT, GL_RGB, GL_UNSIGNED_INT_8_8_8_8, true},   // DXT1
     {GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, true}, // DXT23
     {GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, true}, // DXT45
+    {GL_COMPRESSED_RED_RGTC1, GL_RED, GL_UNSIGNED_INT_8_8_8_8, true},           // DXN1
 }};
 
 static const FormatTuple& GetFormatTuple(PixelFormat pixel_format, ComponentType component_type) {
@@ -113,7 +114,7 @@ static constexpr std::array<void (*)(u32, u32, u32, u8*, Tegra::GPUVAddr, Tegra:
         MortonCopy<true, PixelFormat::A2B10G10R10>, MortonCopy<true, PixelFormat::A1B5G5R5>,
         MortonCopy<true, PixelFormat::R8>,          MortonCopy<true, PixelFormat::RGBA16F>,
         MortonCopy<true, PixelFormat::DXT1>,        MortonCopy<true, PixelFormat::DXT23>,
-        MortonCopy<true, PixelFormat::DXT45>,
+        MortonCopy<true, PixelFormat::DXT45>,       MortonCopy<true, PixelFormat::DXN1>,
 };
 
 static constexpr std::array<void (*)(u32, u32, u32, u8*, Tegra::GPUVAddr, Tegra::GPUVAddr,
@@ -126,7 +127,8 @@ static constexpr std::array<void (*)(u32, u32, u32, u8*, Tegra::GPUVAddr, Tegra:
         MortonCopy<false, PixelFormat::A1B5G5R5>,
         MortonCopy<false, PixelFormat::R8>,
         MortonCopy<false, PixelFormat::RGBA16F>,
-        // TODO(Subv): Swizzling the DXT1/DXT23/DXT45 formats is not yet supported
+        // TODO(Subv): Swizzling the DXT1/DXT23/DXT45/DXN1 formats is not yet supported
+        nullptr,
         nullptr,
         nullptr,
         nullptr,
diff --git a/src/video_core/renderer_opengl/gl_rasterizer_cache.h b/src/video_core/renderer_opengl/gl_rasterizer_cache.h
index 07461017d..6f08678ab 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer_cache.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer_cache.h
@@ -63,6 +63,7 @@ struct SurfaceParams {
         DXT1 = 6,
         DXT23 = 7,
         DXT45 = 8,
+        DXN1 = 9, // This is also known as BC4
 
         Max,
         Invalid = 255,
@@ -107,6 +108,7 @@ struct SurfaceParams {
             4, // DXT1
             4, // DXT23
             4, // DXT45
+            4, // DXN1
         }};
 
         ASSERT(static_cast<size_t>(format) < compression_factor_table.size());
@@ -130,6 +132,7 @@ struct SurfaceParams {
             64,  // DXT1
             128, // DXT23
             128, // DXT45
+            64,  // DXN1
         }};
 
         ASSERT(static_cast<size_t>(format) < bpp_table.size());
@@ -185,6 +188,8 @@ struct SurfaceParams {
             return PixelFormat::DXT23;
         case Tegra::Texture::TextureFormat::DXT45:
             return PixelFormat::DXT45;
+        case Tegra::Texture::TextureFormat::DXN1:
+            return PixelFormat::DXN1;
         default:
             NGLOG_CRITICAL(HW_GPU, "Unimplemented format={}", static_cast<u32>(format));
             UNREACHABLE();
@@ -212,6 +217,8 @@ struct SurfaceParams {
             return Tegra::Texture::TextureFormat::DXT23;
         case PixelFormat::DXT45:
             return Tegra::Texture::TextureFormat::DXT45;
+        case PixelFormat::DXN1:
+            return Tegra::Texture::TextureFormat::DXN1;
         default:
             UNREACHABLE();
         }
-- 
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