cpp/openttd-patchpack/source Changeset - r24903:52c78465b677

Changeset - r24903:52c78465b677

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Michael Lutz - 3 years ago 2021-01-16 15:43:35
michi@icosahedron.de

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

1 file changed with 9 insertions and 0 deletions:

src/video/opengl.cpp

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src/video/opengl.cpp

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@@ @@ -626,6 +626,15 @@ bool OpenGLBackend::Resize(int w, int h, @@
 	/* Re-allocate video buffer texture and backing store. */
 	_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.
 	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);
 	_glActiveTexture(GL_TEXTURE0);

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