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authorMichael Lutz <michi@icosahedron.de>2021-01-16 16:43:35 +0100
committerMichael Lutz <michi@icosahedron.de>2021-02-22 22:16:07 +0100
commitbcd15b4dd2b40c0d15b0faa3254c18982aea16c2 (patch)
tree9e35a7e0bdb91b7af521159c7a677ba24e9331b3 /src/video
parent1e1a9f39994bf6b4053a423f2b064b917fee402c (diff)
downloadopenttd-bcd15b4dd2b40c0d15b0faa3254c18982aea16c2.tar.xz
Codechange: [OpenGL] Initialize backing store to opaque alpha to allow blending effects.
Diffstat (limited to 'src/video')
-rw-r--r--src/video/opengl.cpp9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/video/opengl.cpp b/src/video/opengl.cpp
index b5292b88b..3d3e435c1 100644
--- a/src/video/opengl.cpp
+++ b/src/video/opengl.cpp
@@ -626,6 +626,15 @@ bool OpenGLBackend::Resize(int w, int h, bool force)
/* 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);