citra-qt: Add texture viewer to Pica command list.

The texture viewer is enabled when selecting a write command to one of the texture config registers.

2 files changed, 45 insertions, 21 deletions

diff --git a/src/video_core/debug_utils/debug_utils.cpp b/src/video_core/debug_utils/debug_utils.cpp
index 11f87d98..59909c82 100644
--- a/src/video_core/debug_utils/debug_utils.cpp
+++ b/src/video_core/debug_utils/debug_utils.cpp
@@ -2,6 +2,8 @@
 // Licensed under GPLv2
 // Refer to the license.txt file included.
 
+#include <cassert>
+
 #include <algorithm>
 #include <condition_variable>
 #include <list>
@@ -17,6 +19,7 @@
 #include "common/log.h"
 #include "common/file_util.h"
 
+#include "video_core/math.h"
 #include "video_core/pica.h"
 
 #include "debug_utils.h"
@@ -355,6 +358,30 @@ std::unique_ptr<PicaTrace> FinishPicaTracing()
     return std::move(ret);
 }
 
+const Math::Vec4<u8> LookupTexture(const u8* source, int x, int y, const TextureInfo& info) {
+    assert(info.format == Pica::Regs::TextureFormat::RGB8);
+
+    // Cf. rasterizer code for an explanation of this algorithm.
+    int texel_index_within_tile = 0;
+    for (int block_size_index = 0; block_size_index < 3; ++block_size_index) {
+        int sub_tile_width = 1 << block_size_index;
+        int sub_tile_height = 1 << block_size_index;
+
+        int sub_tile_index = (x & sub_tile_width) << block_size_index;
+        sub_tile_index += 2 * ((y & sub_tile_height) << block_size_index);
+        texel_index_within_tile += sub_tile_index;
+    }
+
+    const int block_width = 8;
+    const int block_height = 8;
+
+    int coarse_x = (x / block_width) * block_width;
+    int coarse_y = (y / block_height) * block_height;
+
+    const u8* source_ptr = source + coarse_x * block_height * 3 + coarse_y * info.stride + texel_index_within_tile * 3;
+    return { source_ptr[2], source_ptr[1], source_ptr[0], 255 };
+}
+
 void DumpTexture(const Pica::Regs::TextureConfig& texture_config, u8* data) {
     // NOTE: Permanently enabling this just trashes hard disks for no reason.
     //       Hence, this is currently disabled.
@@ -420,27 +447,15 @@ void DumpTexture(const Pica::Regs::TextureConfig& texture_config, u8* data) {
     buf = new u8[row_stride * texture_config.height];
     for (unsigned y = 0; y < texture_config.height; ++y) {
         for (unsigned x = 0; x < texture_config.width; ++x) {
-            // Cf. rasterizer code for an explanation of this algorithm.
-            int texel_index_within_tile = 0;
-            for (int block_size_index = 0; block_size_index < 3; ++block_size_index) {
-                int sub_tile_width = 1 << block_size_index;
-                int sub_tile_height = 1 << block_size_index;
-
-                int sub_tile_index = (x & sub_tile_width) << block_size_index;
-                sub_tile_index += 2 * ((y & sub_tile_height) << block_size_index);
-                texel_index_within_tile += sub_tile_index;
-            }
-
-            const int block_width = 8;
-            const int block_height = 8;
-
-            int coarse_x = (x / block_width) * block_width;
-            int coarse_y = (y / block_height) * block_height;
-
-            u8* source_ptr = (u8*)data + coarse_x * block_height * 3 + coarse_y * row_stride + texel_index_within_tile * 3;
-            buf[3 * x + y * row_stride    ] = source_ptr[2];
-            buf[3 * x + y * row_stride + 1] = source_ptr[1];
-            buf[3 * x + y * row_stride + 2] = source_ptr[0];
+            TextureInfo info;
+            info.width = texture_config.width;
+            info.height = texture_config.height;
+            info.stride = row_stride;
+            info.format = registers.texture0_format;
+            Math::Vec4<u8> texture_color = LookupTexture(data, x, y, info);
+            buf[3 * x + y * row_stride    ] = texture_color.r();
+            buf[3 * x + y * row_stride + 1] = texture_color.g();
+            buf[3 * x + y * row_stride + 2] = texture_color.b();
         }
     }
 
diff --git a/src/video_core/debug_utils/debug_utils.h b/src/video_core/debug_utils/debug_utils.h
index 26b26e22..bad4c919 100644
--- a/src/video_core/debug_utils/debug_utils.h
+++ b/src/video_core/debug_utils/debug_utils.h
@@ -12,6 +12,7 @@
 #include <mutex>
 #include <vector>
 
+#include "video_core/math.h"
 #include "video_core/pica.h"
 
 namespace Pica {
@@ -190,6 +191,14 @@ bool IsPicaTracing();
 void OnPicaRegWrite(u32 id, u32 value);
 std::unique_ptr<PicaTrace> FinishPicaTracing();
 
+struct TextureInfo {
+    int width;
+    int height;
+    int stride;
+    Pica::Regs::TextureFormat format;
+};
+
+const Math::Vec4<u8> LookupTexture(const u8* source, int x, int y, const TextureInfo& info);
 void DumpTexture(const Pica::Regs::TextureConfig& texture_config, u8* data);
 
 void DumpTevStageConfig(const std::array<Pica::Regs::TevStageConfig,6>& stages);