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-rw-r--r--src/mesa/main/framebuffer.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
index 31689c8fe80..01f84180af7 100644
--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -544,7 +544,8 @@ _mesa_update_framebuffer_visual(struct gl_framebuffer *fb)
const GLenum baseFormat = _mesa_get_format_base_format(rb->Format);
const gl_format fmt = rb->Format;
- if (baseFormat == GL_RGBA || baseFormat == GL_RGB) {
+ if (baseFormat == GL_RGBA || baseFormat == GL_RGB ||
+ baseFormat == GL_ALPHA) {
fb->Visual.redBits = _mesa_get_format_bits(fmt, GL_RED_BITS);
fb->Visual.greenBits = _mesa_get_format_bits(fmt, GL_GREEN_BITS);
fb->Visual.blueBits = _mesa_get_format_bits(fmt, GL_BLUE_BITS);