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Codechange: [OpenGL] Initialize backing store to opaque alpha to allow blending effects.

pull/8729/head
Michael Lutz 2021-01-16 16:43:35 +01:00
parent 1e1a9f3999
commit bcd15b4dd2
1 changed files with 9 additions and 0 deletions
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9
src/video/opengl.cpp
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@ -626,6 +626,15 @@ bool OpenGLBackend::Resize(int w, int h, bool force)
/* Re-allocate video buffer texture and backing store. */ /* Re-allocate video buffer texture and backing store. */
_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vid_pbo); _glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vid_pbo);
_glBufferData(GL_PIXEL_UNPACK_BUFFER, pitch * h * bpp / 8, nullptr, GL_DYNAMIC_READ); // Buffer content has to persist from frame to frame and is read back by the blitter, which means a READ usage hint. _glBufferData(GL_PIXEL_UNPACK_BUFFER, pitch * h * bpp / 8, nullptr, GL_DYNAMIC_READ); // Buffer content has to persist from frame to frame and is read back by the blitter, which means a READ usage hint.
if (bpp == 32) {
/* Initialize backing store alpha to opaque for 32bpp modes. */
Colour black(0, 0, 0);
uint32 *buf = (uint32 *)_glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_READ_WRITE);
for (int i = 0; i < pitch * h; i++) {
*buf++ = black.data;
}
_glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
}
_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0); _glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
_glActiveTexture(GL_TEXTURE0); _glActiveTexture(GL_TEXTURE0);