4 files changed, 53 insertions, 2 deletions

diff --git a/src/video_core/renderer_opengl/gl_texture_cache.cpp b/src/video_core/renderer_opengl/gl_texture_cache.cpp
index 9f7ce7414..eb6e43a08 100644
--- a/src/video_core/renderer_opengl/gl_texture_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_texture_cache.cpp
@@ -557,6 +557,14 @@ void TextureCacheRuntime::CopyImage(Image& dst_image, Image& src_image,
     }
 }
 
+void TextureCacheRuntime::CopyImageMSAA(Image& dst_image, Image& src_image,
+                                        std::span<const VideoCommon::ImageCopy> copies) {
+    LOG_DEBUG(Render_OpenGL, "Copying from {} samples to {} samples", src_image.info.num_samples,
+              dst_image.info.num_samples);
+    // TODO: Leverage the format conversion pass if possible/accurate.
+    util_shaders.CopyMSAA(dst_image, src_image, copies);
+}
+
 void TextureCacheRuntime::ReinterpretImage(Image& dst, Image& src,
                                            std::span<const VideoCommon::ImageCopy> copies) {
     LOG_DEBUG(Render_OpenGL, "Converting {} to {}", src.info.format, dst.info.format);
diff --git a/src/video_core/renderer_opengl/gl_texture_cache.h b/src/video_core/renderer_opengl/gl_texture_cache.h
index 5d9d370f2..e30875496 100644
--- a/src/video_core/renderer_opengl/gl_texture_cache.h
+++ b/src/video_core/renderer_opengl/gl_texture_cache.h
@@ -93,12 +93,19 @@ public:
         return device.CanReportMemoryUsage();
     }
 
-    bool ShouldReinterpret([[maybe_unused]] Image& dst, [[maybe_unused]] Image& src) {
+    bool ShouldReinterpret([[maybe_unused]] Image& dst,
+                           [[maybe_unused]] Image& src) const noexcept {
+        return true;
+    }
+
+    bool CanUploadMSAA() const noexcept {
         return true;
     }
 
     void CopyImage(Image& dst, Image& src, std::span<const VideoCommon::ImageCopy> copies);
 
+    void CopyImageMSAA(Image& dst, Image& src, std::span<const VideoCommon::ImageCopy> copies);
+
     void ReinterpretImage(Image& dst, Image& src, std::span<const VideoCommon::ImageCopy> copies);
 
     void ConvertImage(Framebuffer* dst, ImageView& dst_view, ImageView& src_view) {
diff --git a/src/video_core/renderer_opengl/util_shaders.cpp b/src/video_core/renderer_opengl/util_shaders.cpp
index 404def62e..2c7ac210b 100644
--- a/src/video_core/renderer_opengl/util_shaders.cpp
+++ b/src/video_core/renderer_opengl/util_shaders.cpp
@@ -12,6 +12,8 @@
 #include "video_core/host_shaders/astc_decoder_comp.h"
 #include "video_core/host_shaders/block_linear_unswizzle_2d_comp.h"
 #include "video_core/host_shaders/block_linear_unswizzle_3d_comp.h"
+#include "video_core/host_shaders/convert_msaa_to_non_msaa_comp.h"
+#include "video_core/host_shaders/convert_non_msaa_to_msaa_comp.h"
 #include "video_core/host_shaders/opengl_convert_s8d24_comp.h"
 #include "video_core/host_shaders/opengl_copy_bc4_comp.h"
 #include "video_core/host_shaders/pitch_unswizzle_comp.h"
@@ -51,7 +53,9 @@ UtilShaders::UtilShaders(ProgramManager& program_manager_)
       block_linear_unswizzle_3d_program(MakeProgram(BLOCK_LINEAR_UNSWIZZLE_3D_COMP)),
       pitch_unswizzle_program(MakeProgram(PITCH_UNSWIZZLE_COMP)),
       copy_bc4_program(MakeProgram(OPENGL_COPY_BC4_COMP)),
-      convert_s8d24_program(MakeProgram(OPENGL_CONVERT_S8D24_COMP)) {
+      convert_s8d24_program(MakeProgram(OPENGL_CONVERT_S8D24_COMP)),
+      convert_ms_to_nonms_program(MakeProgram(CONVERT_MSAA_TO_NON_MSAA_COMP)),
+      convert_nonms_to_ms_program(MakeProgram(CONVERT_NON_MSAA_TO_MSAA_COMP)) {
     const auto swizzle_table = Tegra::Texture::MakeSwizzleTable();
     swizzle_table_buffer.Create();
     glNamedBufferStorage(swizzle_table_buffer.handle, sizeof(swizzle_table), &swizzle_table, 0);
@@ -269,6 +273,33 @@ void UtilShaders::ConvertS8D24(Image& dst_image, std::span<const ImageCopy> copi
     program_manager.RestoreGuestCompute();
 }
 
+void UtilShaders::CopyMSAA(Image& dst_image, Image& src_image,
+                           std::span<const VideoCommon::ImageCopy> copies) {
+    const bool is_ms_to_non_ms = src_image.info.num_samples > 1 && dst_image.info.num_samples == 1;
+    const auto program_handle =
+        is_ms_to_non_ms ? convert_ms_to_nonms_program.handle : convert_nonms_to_ms_program.handle;
+    program_manager.BindComputeProgram(program_handle);
+
+    for (const ImageCopy& copy : copies) {
+        ASSERT(copy.src_subresource.base_layer == 0);
+        ASSERT(copy.src_subresource.num_layers == 1);
+        ASSERT(copy.dst_subresource.base_layer == 0);
+        ASSERT(copy.dst_subresource.num_layers == 1);
+
+        glBindImageTexture(0, src_image.StorageHandle(), copy.src_subresource.base_level, GL_TRUE,
+                           0, GL_READ_ONLY, GL_RGBA8);
+        glBindImageTexture(1, dst_image.StorageHandle(), copy.dst_subresource.base_level, GL_TRUE,
+                           0, GL_WRITE_ONLY, GL_RGBA8);
+
+        const u32 num_dispatches_x = Common::DivCeil(copy.extent.width, 8U);
+        const u32 num_dispatches_y = Common::DivCeil(copy.extent.height, 8U);
+        const u32 num_dispatches_z = copy.extent.depth;
+
+        glDispatchCompute(num_dispatches_x, num_dispatches_y, num_dispatches_z);
+    }
+    program_manager.RestoreGuestCompute();
+}
+
 GLenum StoreFormat(u32 bytes_per_block) {
     switch (bytes_per_block) {
     case 1:
diff --git a/src/video_core/renderer_opengl/util_shaders.h b/src/video_core/renderer_opengl/util_shaders.h
index 44efb6ecf..9013808e7 100644
--- a/src/video_core/renderer_opengl/util_shaders.h
+++ b/src/video_core/renderer_opengl/util_shaders.h
@@ -40,6 +40,9 @@ public:
 
     void ConvertS8D24(Image& dst_image, std::span<const VideoCommon::ImageCopy> copies);
 
+    void CopyMSAA(Image& dst_image, Image& src_image,
+                  std::span<const VideoCommon::ImageCopy> copies);
+
 private:
     ProgramManager& program_manager;
 
@@ -51,6 +54,8 @@ private:
     OGLProgram pitch_unswizzle_program;
     OGLProgram copy_bc4_program;
     OGLProgram convert_s8d24_program;
+    OGLProgram convert_ms_to_nonms_program;
+    OGLProgram convert_nonms_to_ms_program;
 };
 
 GLenum StoreFormat(u32 bytes_per_block);