glx/apple: locate dispatch table functions to wrap by name

Avoid reaching into the dispatch table internals (and thus having to deal
with the complexities of remap etc.) by identifying functions to wrap by
name.

See:
https://lists.freedesktop.org/archives/mesa-dev/2015-June/086721.html et seq.
https://bugs.freedesktop.org/show_bug.cgi?id=90311

Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

3 files changed, 22 insertions, 7 deletions

diff --git a/src/glx/apple/apple_glapi.c b/src/glx/apple/apple_glapi.c
index 4d19f7f6a3..f2248ab01a 100644
--- a/src/glx/apple/apple_glapi.c
+++ b/src/glx/apple/apple_glapi.c
@@ -41,7 +41,6 @@
 #include "main/glheader.h"
 #include "glapi.h"
 #include "glapitable.h"
-#include "main/dispatch.h"
 
 #include "apple_glx.h"
 #include "apple_xgl_api.h"
@@ -61,12 +60,11 @@ static void _apple_glapi_create_table(void) {
     assert(__applegl_api);
     memcpy(__applegl_api, __ogl_framework_api, sizeof(struct _glapi_table));
 
-    SET_ReadPixels(__applegl_api, __applegl_glReadPixels);
-    SET_CopyPixels(__applegl_api, __applegl_glCopyPixels);
-    SET_CopyColorTable(__applegl_api, __applegl_glCopyColorTable);
-    SET_DrawBuffer(__applegl_api, __applegl_glDrawBuffer);
-    SET_DrawBuffers(__applegl_api, __applegl_glDrawBuffers);
-    SET_Viewport(__applegl_api, __applegl_glViewport);
+    _glapi_table_patch(__applegl_api, "ReadPixels", __applegl_glReadPixels);
+    _glapi_table_patch(__applegl_api, "CopyPixels", __applegl_glCopyPixels);
+    _glapi_table_patch(__applegl_api, "CopyColorTable", __applegl_glCopyColorTable);
+    _glapi_table_patch(__applegl_api, "DrawBuffers", __applegl_glDrawBuffer);
+    _glapi_table_patch(__applegl_api, "Viewport", __applegl_glViewport);
 }
 
 void apple_glapi_set_dispatch(void) {
diff --git a/src/mapi/glapi/gen/gl_gentable.py b/src/mapi/glapi/gen/gl_gentable.py
index 2f54d1d579..50153bbabd 100644
--- a/src/mapi/glapi/gen/gl_gentable.py
+++ b/src/mapi/glapi/gen/gl_gentable.py
@@ -56,6 +56,7 @@ header = """/* GLXEXT is the define used in the xserver when the GLX extension i
 #endif
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "main/glheader.h"
 
@@ -144,6 +145,19 @@ _glapi_create_table_from_handle(void *handle, const char *symbol_prefix) {
 
     return disp;
 }
+
+void
+ _glapi_table_patch(struct _glapi_table *table, const char *name, void *wrapper)
+{
+   for (int func_index = 0; func_index < GLAPI_TABLE_COUNT; ++func_index) {
+      if (!strcmp(_glapi_table_func_names[func_index], name)) {
+            ((void **)table)[func_index] = wrapper;
+            return;
+         }
+   }
+   fprintf(stderr, "could not patch %s in dispatch table\\n", name);
+}
+
 """
 
 
diff --git a/src/mapi/glapi/glapi.h b/src/mapi/glapi/glapi.h
index f1ad4c1b5e..d5d4e0a03a 100644
--- a/src/mapi/glapi/glapi.h
+++ b/src/mapi/glapi/glapi.h
@@ -161,6 +161,9 @@ _glapi_get_proc_name(unsigned int offset);
 #if defined(GLX_USE_APPLEGL) || defined(GLX_USE_WINDOWSGL)
 _GLAPI_EXPORT struct _glapi_table *
 _glapi_create_table_from_handle(void *handle, const char *symbol_prefix);
+
+_GLAPI_EXPORT void
+_glapi_table_patch(struct _glapi_table *, const char *name, void *wrapper);
 #endif