Wayland EGL patches#1
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November 20, 2015 15:42
Using glTexSubImage2D to upload pixel data, some hardware fails to convert the to the same internal format as originally specified by glTexSubImage.
The colour key should be loaded in RGB888, and not the source picture format; the pixel shader doesn't know the source format. Use dfb_pixel_to_color(). DFB and GL are free to differ in the bottom-most bits when expanding a colour channel from 6 or 5 bits to 8 bits. The bottom 2 or 3 bits must be ignored when comparing a pixel to the colour-key. GLSL 1.0 doesn't have bitmasks, so this is done with integer arithmetic.
…will preserve the back buffer. Enable this behaviour with eglSurfaceAttrib(... EGL_BUFFER_PRESERVED)
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