renderer_opengl: Emulate texture copy with blit for now

src/video_core/rasterizer_cache/rasterizer_cache.h

@@ -278,9 +278,9 @@ bool RasterizerCache<T>::BlitSurfaces(const Surface& src_surface, Common::Rectan
 
     dst_surface->InvalidateAllWatcher();
 
-    // Prefer texture copy over blit if possible. This is possible when the following is true:
+    // Prefer texture copy over blit when possible. This can happen when the following is true:
-    // 1. No scaling (the dimentions of src and dest rect are the same
+    // 1. No scaling (the dimentions of src and dest rect are the same)
-    // 2. No flipping (if the bottom value is bigger than the top this indicates texture flip
+    // 2. No flipping (if the bottom value is bigger than the top this indicates texture flip)
     if (src_rect.GetWidth() == dst_rect.GetWidth() &&
             src_rect.GetHeight() == dst_rect.GetHeight() &&
             src_rect.bottom < src_rect.top) {

src/video_core/renderer_opengl/gl_driver.cpp

@@ -79,10 +79,8 @@ Driver::Driver(bool gles, bool enable_debug) : is_gles{gles} {
      * Qualcomm has some spammy info messages that are marked as errors but not important
      * https://developer.qualcomm.com/comment/11845
      */
-    if (enable_debug) {
+    glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
-        glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
+    glDebugMessageCallback(DebugHandler, nullptr);
-        glDebugMessageCallback(DebugHandler, nullptr);
-    }
 #endif
 
     ReportDriverInfo();

src/video_core/renderer_opengl/gl_texture_runtime.cpp

@@ -243,7 +243,19 @@ bool TextureRuntime::ClearTexture(Surface& surface, const VideoCore::TextureClea
 }
 
 bool TextureRuntime::CopyTextures(Surface& source, Surface& dest, const VideoCore::TextureCopy& copy) {
-    return true;
+    // Emulate texture copy with blit for now
+    const VideoCore::TextureBlit blit = {
+        .src_level = copy.src_level,
+        .dst_level = copy.dst_level,
+        .src_layer = copy.src_layer,
+        .dst_layer = copy.dst_layer,
+        .src_rect = {copy.src_offset.x, copy.extent.height,
+                     copy.extent.width, copy.src_offset.x},
+        .dst_rect = {copy.dst_offset.x, copy.extent.height,
+                     copy.extent.width, copy.dst_offset.x}
+    };
+
+    return BlitTextures(source, dest, blit);
 }
 
 bool TextureRuntime::BlitTextures(Surface& source, Surface& dest, const VideoCore::TextureBlit& blit) {