From f681cb455cf0de0fb54febcbc55eba10a3ecebff Mon Sep 17 00:00:00 2001
From: twinaphex <libretro@gmail.com>
Date: Tue, 7 Nov 2017 07:56:18 +0100
Subject: [PATCH] Prepare GL renderchains

---
 gfx/video_driver.c | 40 ++++++++++++++++++++++++++++++++++++----
 gfx/video_driver.h |  6 ++++++
 2 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/gfx/video_driver.c b/gfx/video_driver.c
index 663574c2f4..482137163b 100644
--- a/gfx/video_driver.c
+++ b/gfx/video_driver.c
@@ -407,7 +407,7 @@ static const shader_backend_t *shader_ctx_drivers[] = {
    NULL
 };
 
-static const d3d_renderchain_driver_t *renderchain_drivers[] = {
+static const d3d_renderchain_driver_t *renderchain_d3d_drivers[] = {
 #if defined(_WIN32) && defined(HAVE_D3D9) && defined(HAVE_CG)
    &cg_d3d9_renderchain,
 #endif
@@ -421,6 +421,13 @@ static const d3d_renderchain_driver_t *renderchain_drivers[] = {
    NULL
 };
 
+static const gl_renderchain_driver_t *renderchain_gl_drivers[] = {
+#if defined(HAVE_OPENGL)
+   &gl2_renderchain,
+#endif
+   NULL
+};
+
 /* Stub functions */
 
 static void update_window_title_null(void *data, void *data2)
@@ -3414,14 +3421,39 @@ bool renderchain_d3d_init_first(const d3d_renderchain_driver_t **renderchain_dri
 {
    unsigned i;
 
-   for (i = 0; renderchain_drivers[i]; i++)
+   for (i = 0; renderchain_d3d_drivers[i]; i++)
    {
-      void *data = renderchain_drivers[i]->chain_new();
+      void *data = renderchain_d3d_drivers[i]->chain_new();
 
       if (!data)
          continue;
 
-      *renderchain_driver = renderchain_drivers[i];
+      *renderchain_driver = renderchain_d3d_drivers[i];
+      *renderchain_handle = data;
+      return true;
+   }
+
+   return false;
+}
+
+bool renderchain_gl_init_first(
+      const gl_renderchain_driver_t **renderchain_driver,
+      void **renderchain_handle)
+{
+   unsigned i;
+
+   for (i = 0; renderchain_gl_drivers[i]; i++)
+   {
+#if 0
+      void *data = renderchain_gl_drivers[i]->chain_new();
+#else
+      void *data = NULL;
+#endif
+
+      if (!data)
+         continue;
+
+      *renderchain_driver = renderchain_gl_drivers[i];
       *renderchain_handle = data;
       return true;
    }
diff --git a/gfx/video_driver.h b/gfx/video_driver.h
index b2b67ec973..0c09d94da1 100644
--- a/gfx/video_driver.h
+++ b/gfx/video_driver.h
@@ -1261,6 +1261,10 @@ bool renderchain_d3d_init_first(
       const d3d_renderchain_driver_t **renderchain_driver,
       void **renderchain_handle);
 
+bool renderchain_gl_init_first(
+      const gl_renderchain_driver_t **renderchain_driver,
+      void **renderchain_handle);
+
 extern bool (*video_driver_cb_has_focus)(void);
 
 extern shader_backend_t *current_shader;
@@ -1323,6 +1327,8 @@ extern d3d_renderchain_driver_t cg_d3d9_renderchain;
 extern d3d_renderchain_driver_t hlsl_d3d9_renderchain;
 extern d3d_renderchain_driver_t null_renderchain;
 
+extern gl_renderchain_driver_t gl2_renderchain;
+
 RETRO_END_DECLS
 
 #endif