From 0f929762b3ba722bab1290a9fe23fc8ad6e909f4 Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Mon, 2 Jul 2018 12:42:04 -0500
Subject: GPU: Implemented the Z24S8 depth format and load the depth
 framebuffer.

---
 src/video_core/textures/decoders.cpp | 31 +++++++++++++++++++++++++++++++
 src/video_core/textures/decoders.h   |  6 ++++++
 2 files changed, 37 insertions(+)

(limited to 'src/video_core/textures')

diff --git a/src/video_core/textures/decoders.cpp b/src/video_core/textures/decoders.cpp
index eaf15da32..680f22ddb 100644
--- a/src/video_core/textures/decoders.cpp
+++ b/src/video_core/textures/decoders.cpp
@@ -5,6 +5,7 @@
 #include <cstring>
 #include "common/assert.h"
 #include "core/memory.h"
+#include "video_core/gpu.h"
 #include "video_core/textures/decoders.h"
 #include "video_core/textures/texture.h"
 
@@ -73,6 +74,16 @@ u32 BytesPerPixel(TextureFormat format) {
     }
 }
 
+static u32 DepthBytesPerPixel(DepthFormat format) {
+    switch (format) {
+    case DepthFormat::Z24_S8_UNORM:
+        return 4;
+    default:
+        UNIMPLEMENTED_MSG("Format not implemented");
+        break;
+    }
+}
+
 std::vector<u8> UnswizzleTexture(VAddr address, TextureFormat format, u32 width, u32 height,
                                  u32 block_height) {
     u8* data = Memory::GetPointer(address);
@@ -110,6 +121,26 @@ std::vector<u8> UnswizzleTexture(VAddr address, TextureFormat format, u32 width,
     return unswizzled_data;
 }
 
+std::vector<u8> UnswizzleDepthTexture(VAddr address, DepthFormat format, u32 width, u32 height,
+                                      u32 block_height) {
+    u8* data = Memory::GetPointer(address);
+    u32 bytes_per_pixel = DepthBytesPerPixel(format);
+
+    std::vector<u8> unswizzled_data(width * height * bytes_per_pixel);
+
+    switch (format) {
+    case DepthFormat::Z24_S8_UNORM:
+        CopySwizzledData(width, height, bytes_per_pixel, bytes_per_pixel, data,
+                         unswizzled_data.data(), true, block_height);
+        break;
+    default:
+        UNIMPLEMENTED_MSG("Format not implemented");
+        break;
+    }
+
+    return unswizzled_data;
+}
+
 std::vector<u8> DecodeTexture(const std::vector<u8>& texture_data, TextureFormat format, u32 width,
                               u32 height) {
     std::vector<u8> rgba_data;
diff --git a/src/video_core/textures/decoders.h b/src/video_core/textures/decoders.h
index 2562c4b06..2b088c077 100644
--- a/src/video_core/textures/decoders.h
+++ b/src/video_core/textures/decoders.h
@@ -17,6 +17,12 @@ namespace Texture {
 std::vector<u8> UnswizzleTexture(VAddr address, TextureFormat format, u32 width, u32 height,
                                  u32 block_height = TICEntry::DefaultBlockHeight);
 
+/**
+ * Unswizzles a swizzled depth texture without changing its format.
+ */
+std::vector<u8> UnswizzleDepthTexture(VAddr address, DepthFormat format, u32 width, u32 height,
+                                      u32 block_height = TICEntry::DefaultBlockHeight);
+
 /// Copies texture data from a buffer and performs swizzling/unswizzling as necessary.
 void CopySwizzledData(u32 width, u32 height, u32 bytes_per_pixel, u32 out_bytes_per_pixel,
                       u8* swizzled_data, u8* unswizzled_data, bool unswizzle, u32 block_height);
-- 
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