mesa: Add a default QueryInternalFormat() function for drivers

This is a fallback function for drivers not implementing
ARB_internalformat_query2.

Reviewed-by: Dave Airlie <airlied@redhat.com>

src/mesa/drivers/common/driverfuncs.c

@@ -91,6 +91,7 @@ _mesa_init_driver_functions(struct dd_function_table *driver)
    /* Texture functions */
    driver->ChooseTextureFormat = _mesa_choose_tex_format;
    driver->QuerySamplesForFormat = _mesa_query_samples_for_format;
+   driver->QueryInternalFormat = _mesa_query_internal_format_default;
    driver->TexImage = _mesa_store_teximage;
    driver->TexSubImage = _mesa_store_texsubimage;
    driver->GetTexSubImage = _mesa_meta_GetTexSubImage;

src/mesa/main/formatquery.c

@@ -43,6 +43,22 @@ _mesa_query_samples_for_format(struct gl_context *ctx, GLenum target,
    return 1;
 }
 
+/* default implementation of QueryInternalFormat driverfunc, for
+ * drivers not implementing ARB_internalformat_query2.
+ */
+void
+_mesa_query_internal_format_default(struct gl_context *ctx, GLenum target,
+                                    GLenum internalFormat, GLenum pname,
+                                    GLint *params)
+{
+   (void) ctx;
+   (void) target;
+   (void) internalFormat;
+   (void) pname;
+   (void) params;
+
+   /* @TODO */
+}
 
 void GLAPIENTRY
 _mesa_GetInternalformativ(GLenum target, GLenum internalformat, GLenum pname,

src/mesa/main/formatquery.h

@@ -32,6 +32,11 @@ size_t
 _mesa_query_samples_for_format(struct gl_context *ctx, GLenum target,
                                GLenum internalFormat, int samples[16]);
 
+void
+_mesa_query_internal_format_default(struct gl_context *ctx, GLenum target,
+                                    GLenum internalFormat, GLenum pname,
+                                    GLint *params);
+
 extern void GLAPIENTRY
 _mesa_GetInternalformativ(GLenum target, GLenum internalformat,
                           GLenum pname, GLsizei bufSize, GLint *params);