nvflinger: Use external surface format for framebuffer creation

The format member the IGBPBuffer may not always specify the correct desired format. Using the external format member ensures a valid format is provided when creating the framebuffer.

Fixes homebrew using the wrong framebuffer format.

src/core/hle/service/nvdrv/devices/nvdisp_disp0.cpp

@@ -42,15 +42,14 @@ void nvdisp_disp0::OnClose(DeviceFD fd) {}
 void nvdisp_disp0::flip(u32 buffer_handle, u32 offset, u32 format, u32 width, u32 height,
                         u32 stride, NVFlinger::BufferQueue::BufferTransformFlags transform,
                         const Common::Rectangle<int>& crop_rect) {
-    VAddr addr = nvmap_dev->GetObjectAddress(buffer_handle);
+    const VAddr addr = nvmap_dev->GetObjectAddress(buffer_handle);
     LOG_TRACE(Service,
               "Drawing from address {:X} offset {:08X} Width {} Height {} Stride {} Format {}",
               addr, offset, width, height, stride, format);
 
-    using PixelFormat = Tegra::FramebufferConfig::PixelFormat;
-    const Tegra::FramebufferConfig framebuffer{
-        addr,      offset,   width, height, stride, static_cast<PixelFormat>(format),
-        transform, crop_rect};
+    const auto pixel_format = static_cast<Tegra::FramebufferConfig::PixelFormat>(format);
+    const Tegra::FramebufferConfig framebuffer{addr,   offset,       width,     height,
+                                               stride, pixel_format, transform, crop_rect};
 
     system.GetPerfStats().EndSystemFrame();
     system.GPU().SwapBuffers(&framebuffer);

src/core/hle/service/nvflinger/buffer_queue.h

@@ -38,7 +38,9 @@ struct IGBPBuffer {
     u32_le index;
     INSERT_PADDING_WORDS(3);
     u32_le gpu_buffer_id;
-    INSERT_PADDING_WORDS(17);
+    INSERT_PADDING_WORDS(6);
+    u32_le external_format;
+    INSERT_PADDING_WORDS(10);
     u32_le nvmap_handle;
     u32_le offset;
     INSERT_PADDING_WORDS(60);

src/core/hle/service/nvflinger/nvflinger.cpp

@@ -298,7 +298,7 @@ void NVFlinger::Compose() {
         auto nvdisp = nvdrv->GetDevice<Nvidia::Devices::nvdisp_disp0>("/dev/nvdisp_disp0");
         ASSERT(nvdisp);
 
-        nvdisp->flip(igbp_buffer.gpu_buffer_id, igbp_buffer.offset, igbp_buffer.format,
+        nvdisp->flip(igbp_buffer.gpu_buffer_id, igbp_buffer.offset, igbp_buffer.external_format,
                      igbp_buffer.width, igbp_buffer.height, igbp_buffer.stride,
                      buffer->get().transform, buffer->get().crop_rect);