Added the ability to bind NV12 textures in the OpenGL renderer

src/render/opengl/SDL_render_gl.c

@@ -1671,6 +1671,16 @@ GL_BindTexture (SDL_Renderer * renderer, SDL_Texture *texture, float *texw, floa
         }
         data->glBindTexture(textype, texturedata->utexture);
 
+        if (data->GL_ARB_multitexture_supported) {
+            data->glActiveTextureARB(GL_TEXTURE0_ARB);
+        }
+    }
+    if (texturedata->nv12) {
+        if (data->GL_ARB_multitexture_supported) {
+            data->glActiveTextureARB(GL_TEXTURE1_ARB);
+        }
+        data->glBindTexture(textype, texturedata->utexture);
+
         if (data->GL_ARB_multitexture_supported) {
             data->glActiveTextureARB(GL_TEXTURE0_ARB);
         }
@@ -1681,9 +1691,12 @@ GL_BindTexture (SDL_Renderer * renderer, SDL_Texture *texture, float *texw, floa
     data->drawstate.texturing = SDL_TRUE;
     data->drawstate.texture = texture;
 
-    if(texw) *texw = (float)texturedata->texw;
-    if(texh) *texh = (float)texturedata->texh;
-
+    if (texw) {
+        *texw = (float)texturedata->texw;
+    }
+    if (texh) {
+        *texh = (float)texturedata->texh;
+    }
     return 0;
 }
 
@@ -1701,19 +1714,32 @@ GL_UnbindTexture (SDL_Renderer * renderer, SDL_Texture *texture)
         if (data->GL_ARB_multitexture_supported) {
             data->glActiveTextureARB(GL_TEXTURE2_ARB);
         }
+        data->glBindTexture(textype, 0);
         data->glDisable(textype);
 
         if (data->GL_ARB_multitexture_supported) {
             data->glActiveTextureARB(GL_TEXTURE1_ARB);
         }
+        data->glBindTexture(textype, 0);
         data->glDisable(textype);
 
         if (data->GL_ARB_multitexture_supported) {
             data->glActiveTextureARB(GL_TEXTURE0_ARB);
         }
     }
-#endif
+    if (texturedata->nv12) {
+        if (data->GL_ARB_multitexture_supported) {
+            data->glActiveTextureARB(GL_TEXTURE1_ARB);
+        }
+        data->glBindTexture(textype, 0);
+        data->glDisable(textype);
 
+        if (data->GL_ARB_multitexture_supported) {
+            data->glActiveTextureARB(GL_TEXTURE0_ARB);
+        }
+    }
+#endif
+    data->glBindTexture(textype, 0);
     data->glDisable(textype);
 
     data->drawstate.texturing = SDL_FALSE;