kwin/libkwineffects at 04200484050bbd5710e31d6a02eb0691a8c3b854 - kwin

History

Vlad Zahorodnii 7301564e4f Use bilinear interpolation to compute texture coords of subquads On Wayland, a surface must be displayed the same way no matter how the attached buffer is transformed. In order to guarantee that, we build the surface-to-buffer matrix, which is used to compute the texture coords. The surface-to-buffer matrix represents an affine transformation. Thus, performing linear interpolation between texture coordinates won't end up in corrupted rendered results. This is the main assumption that we make during generation of contents window quads. After creating a sub-quad, the new quad's texture coordinates are computed by interpolating between the source quad's texture coords. However, WindowQuad::makeSubQuad() makes a concrete assumption about the order of texture coords, which might be false if the attached wayland buffer is rotated 90 or 270 degrees. This issue went unnoticed after merging the viewporter patches because the developer who was working on it had been using primarily nested kwin_wayland for testing purposes. And it appears like kwin schedules full screen repaints even though it supports buffer age. It still needs some investigation why that happens. BUG: 428003		5 years ago
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data/glplatform	Detect softpipe and llvmpipe on Mesa 20.2+	5 years ago
CMakeLists.txt	…
kwinglplatformtest.cpp	Prettify license headers	6 years ago
mock_gl.cpp	Prettify license headers	6 years ago
mock_gl.h	Prettify license headers	6 years ago
timelinetest.cpp	Prettify license headers	6 years ago
windowquadlisttest.cpp	Use bilinear interpolation to compute texture coords of subquads	5 years ago