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-rw-r--r--src/mesa/drivers/common/meta.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index 26c89519679..f9b4755988b 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -2869,6 +2869,16 @@ copy_tex_sub_image(struct gl_context *ctx,
/* Choose format/type for temporary image buffer */
format = _mesa_get_format_base_format(texImage->TexFormat);
+ if (format == GL_LUMINANCE ||
+ format == GL_LUMINANCE_ALPHA ||
+ format == GL_INTENSITY) {
+ /* We don't want to use GL_LUMINANCE, GL_INTENSITY, etc. for the
+ * temp image buffer because glReadPixels will do L=R+G+B which is
+ * not what we want (should be L=R).
+ */
+ format = GL_RGBA;
+ }
+
type = get_temp_image_type(ctx, format);
bpp = _mesa_bytes_per_pixel(format, type);
if (bpp <= 0) {