Add support for GL_REPLACE_EXT texture env mode.

GL_REPLACE_EXT comes from the ancient GL_EXT_texture extension.  Found an old demo that
actually uses it.
The values of the GL_REPLACE and GL_REPLACE_EXT tokens is different, unfortunately.

diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index 288b334eaf6f7bb6c1d01473206e53c3fb4c8512..626c26486313a033bff4e147d2bcc56e0093b6fa 100644 (file)
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -213,6 +213,9 @@ calculate_derived_texenv( struct gl_tex_env_combine_state *state,
       return;
    }
 
+   if (mode == GL_REPLACE_EXT)
+      mode = GL_REPLACE;
+
    switch (mode) {
    case GL_REPLACE:
    case GL_MODULATE:
@@ -315,7 +318,9 @@ _mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
       switch (pname) {
       case GL_TEXTURE_ENV_MODE:
          {
-            const GLenum mode = (GLenum) (GLint) *param;
+            GLenum mode = (GLenum) (GLint) *param;
+            if (mode == GL_REPLACE_EXT)
+               mode = GL_REPLACE;
            if (texUnit->EnvMode == mode)
               return;
             if (mode == GL_MODULATE ||