added GL_RED/GREEN/BLUE to is_color_format()

diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 3e0ab88..f35b236 100644 (file)
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -331,6 +331,9 @@ static GLboolean
 is_color_format(GLenum format)
 {
    switch (format) {
+      case GL_RED:
+      case GL_GREEN:
+      case GL_BLUE:
       case GL_ALPHA:
       case GL_ALPHA4:
       case GL_ALPHA8: