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-rw-r--r--src/mesa/main/texgetimage.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c
index 818deb8e41e..42495c8c750 100644
--- a/src/mesa/main/texgetimage.c
+++ b/src/mesa/main/texgetimage.c
@@ -462,6 +462,15 @@ get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
transferOps |= IMAGE_CLAMP_BIT;
}
}
+ /* This applies to RGB, RGBA textures. if the format is either LUMINANCE
+ * or LUMINANCE ALPHA, luminance (L) is computed as L=R+G+B .we need to
+ * clamp the sum to [0,1].
+ */
+ else if ((format == GL_LUMINANCE ||
+ format == GL_LUMINANCE_ALPHA) &&
+ dataType == GL_UNSIGNED_NORMALIZED) {
+ transferOps |= IMAGE_CLAMP_BIT;
+ }
if (_mesa_is_format_compressed(texImage->TexFormat)) {
get_tex_rgba_compressed(ctx, dimensions, format, type,