vi: Partially implement buffer crop parameters.

src/video_core/gpu.h

@@ -67,6 +67,7 @@ struct FramebufferConfig {
 
     using TransformFlags = Service::NVFlinger::BufferQueue::BufferTransformFlags;
     TransformFlags transform_flags;
+    MathUtil::Rectangle<int> crop_rect;
 };
 
 namespace Engines {

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -154,6 +154,7 @@ void RendererOpenGL::LoadFBToScreenInfo(const Tegra::FramebufferConfig& framebuf
 
     // Framebuffer orientation handling
     framebuffer_transform_flags = framebuffer.transform_flags;
+    framebuffer_crop_rect = framebuffer.crop_rect;
 
     // Ensure no bad interactions with GL_UNPACK_ALIGNMENT, which by default
     // only allows rows to have a memory alignement of 4.
@@ -320,11 +321,24 @@ void RendererOpenGL::DrawScreenTriangles(const ScreenInfo& screen_info, float x,
         }
     }
 
+    ASSERT_MSG(framebuffer_crop_rect.top == 0, "Unimplemented");
+    ASSERT_MSG(framebuffer_crop_rect.left == 0, "Unimplemented");
+
+    // Scale the output by the crop width/height. This is commonly used with 1280x720 rendering
+    // (e.g. handheld mode) on a 1920x1080 framebuffer.
+    f32 scale_u = 1.f, scale_v = 1.f;
+    if (framebuffer_crop_rect.GetWidth() > 0) {
+        scale_u = static_cast<f32>(framebuffer_crop_rect.GetWidth()) / screen_info.texture.width;
+    }
+    if (framebuffer_crop_rect.GetHeight() > 0) {
+        scale_v = static_cast<f32>(framebuffer_crop_rect.GetHeight()) / screen_info.texture.height;
+    }
+
     std::array<ScreenRectVertex, 4> vertices = {{
-        ScreenRectVertex(x, y, texcoords.top, left),
-        ScreenRectVertex(x + w, y, texcoords.bottom, left),
-        ScreenRectVertex(x, y + h, texcoords.top, right),
-        ScreenRectVertex(x + w, y + h, texcoords.bottom, right),
+        ScreenRectVertex(x, y, texcoords.top * scale_u, left * scale_v),
+        ScreenRectVertex(x + w, y, texcoords.bottom * scale_u, left * scale_v),
+        ScreenRectVertex(x, y + h, texcoords.top * scale_u, right * scale_v),
+        ScreenRectVertex(x + w, y + h, texcoords.bottom * scale_u, right * scale_v),
     }};
 
     state.texture_units[0].texture_2d = screen_info.display_texture;

src/video_core/renderer_opengl/renderer_opengl.h

@@ -97,4 +97,5 @@ private:
 
     /// Used for transforming the framebuffer orientation
     Tegra::FramebufferConfig::TransformFlags framebuffer_transform_flags;
+    MathUtil::Rectangle<int> framebuffer_crop_rect;
 };