rgtc: fixup mipmap generation

this allows swrast to pass mipmap generation for these formats.

diff --git a/src/mesa/main/mipmap.c b/src/mesa/main/mipmap.c
index d8a56103800a2301704c795dea66b8711cb9fd10..0727e1818f1cc085ada3220977d73dd10d29f184 100644 (file)
--- a/src/mesa/main/mipmap.c
+++ b/src/mesa/main/mipmap.c
@@ -1755,8 +1755,13 @@ _mesa_generate_mipmap(struct gl_context *ctx, GLenum target,
       if (srcImage->_BaseFormat == GL_RGB) {
          convertFormat = MESA_FORMAT_RGB888;
          components = 3;
-      }
-      else if (srcImage->_BaseFormat == GL_RGBA) {
+      } else if (srcImage->_BaseFormat == GL_RED) {
+         convertFormat = MESA_FORMAT_R8;
+         components = 1;
+      } else if (srcImage->_BaseFormat == GL_RG) {
+         convertFormat = MESA_FORMAT_RG88;
+         components = 2;
+      } else if (srcImage->_BaseFormat == GL_RGBA) {
          convertFormat = MESA_FORMAT_RGBA8888;
          components = 4;
       }