st/mesa: do not require all texture formats to be renderable

This is a bandaid on the problem that if some formats were not renderable
(like luminance_alpha), st/mesa fell back to some RGBA format, so basically
some non-renderable formats were actually not used at all. This is only
a problem with hardware drivers, softpipe can render to anything.

Instead, require only RGB8/RGBA8 to be renderable.

diff --git a/src/mesa/state_tracker/st_format.c b/src/mesa/state_tracker/st_format.c
index 1ae6013..f6a44a8 100644 (file)
--- a/src/mesa/state_tracker/st_format.c
+++ b/src/mesa/state_tracker/st_format.c
@@ -1028,8 +1028,13 @@ gl_format
 st_ChooseTextureFormat(struct gl_context *ctx, GLint internalFormat,
                        GLenum format, GLenum type)
 {
+   boolean want_renderable =
+      internalFormat == 3 || internalFormat == 4 ||
+      internalFormat == GL_RGB || internalFormat == GL_RGBA ||
+      internalFormat == GL_RGB8 || internalFormat == GL_RGBA8;
+
    return st_ChooseTextureFormat_renderable(ctx, internalFormat,
-                                           format, type, GL_TRUE);
+                                           format, type, want_renderable);
 }
 
 /**