From cd77093588ccf44dc21d68d0aa956780aa7e6874 Mon Sep 17 00:00:00 2001
From: twinaphex <libretro@gmail.com>
Date: Wed, 13 Mar 2019 12:11:31 +0100
Subject: [PATCH] Reimplement gl2_get_flags to no longer be reliant on shader
 driver's get flags implementation

---
 gfx/drivers/gl.c                  | 35 +++++++++++++++++++++++++++----
 gfx/drivers_shader/shader_gl_cg.c |  2 +-
 2 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/gfx/drivers/gl.c b/gfx/drivers/gl.c
index a9d91bd7a0..9272d3c378 100644
--- a/gfx/drivers/gl.c
+++ b/gfx/drivers/gl.c
@@ -4129,15 +4129,42 @@ static float gl2_get_refresh_rate(void *data)
 
 static uint32_t gl2_get_flags(void *data)
 {
-   gl_t                   *gl = (gl_t*)data;
-   uint32_t             flags = 0;
+   unsigned i;
+   uint32_t shader_driver_count = 0;
+   uint32_t             flags   = 0;
 
    BIT32_SET(flags, GFX_CTX_FLAGS_HARD_SYNC);
    BIT32_SET(flags, GFX_CTX_FLAGS_BLACK_FRAME_INSERTION);
    BIT32_SET(flags, GFX_CTX_FLAGS_MENU_FRAME_FILTERING);
 
-   if (gl && gl->shader->get_flags)
-      gl->shader->get_flags(&flags);
+#ifdef HAVE_GLSL
+   shader_driver_count++;
+#endif
+#ifdef HAVE_CG
+   shader_driver_count++;
+#endif
+
+#ifdef HAVE_GLSL
+   for (i = 0; i < shader_driver_count; i++)
+   {
+      if (string_is_equal(gl2_shader_ctx_drivers[i]->ident, "glsl"))
+      {
+         BIT32_SET(flags, GFX_CTX_FLAGS_SHADERS_GLSL);
+         break;
+      }
+   }
+#endif
+
+#ifdef HAVE_CG
+   for (i = 0; i < shader_driver_count; i++)
+   {
+      if (string_is_equal(gl2_shader_ctx_drivers[i]->ident, "cg"))
+      {
+         BIT32_SET(flags, GFX_CTX_FLAGS_SHADERS_CG);
+         break;
+      }
+   }
+#endif
 
    return flags;
 }
diff --git a/gfx/drivers_shader/shader_gl_cg.c b/gfx/drivers_shader/shader_gl_cg.c
index 947fc5f3a0..250d2a6716 100644
--- a/gfx/drivers_shader/shader_gl_cg.c
+++ b/gfx/drivers_shader/shader_gl_cg.c
@@ -1236,5 +1236,5 @@ const shader_backend_t gl_cg_backend = {
    gl_cg_get_flags,
 
    RARCH_SHADER_CG,
-   "gl_cg"
+   "cg"
 };