From 438661db5e7af1e85fe69c02e10c5bd2e017f73b Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Fri, 5 Dec 2008 07:00:58 +0000
Subject: Whoops, can't call glOrtho() repeatedly

---
 src/video/SDL_renderer_gl.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

(limited to 'src')

diff --git a/src/video/SDL_renderer_gl.c b/src/video/SDL_renderer_gl.c
index afd20a34f3..0da25f72af 100644
--- a/src/video/SDL_renderer_gl.c
+++ b/src/video/SDL_renderer_gl.c
@@ -121,6 +121,7 @@ SDL_RenderDriver GL_RenderDriver = {
 typedef struct
 {
     SDL_GLContext context;
+    SDL_bool updateSize;
     SDL_bool GL_ARB_texture_rectangle_supported;
     SDL_bool GL_EXT_paletted_texture_supported;
     int blendMode;
@@ -357,10 +358,7 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
     } else {
         data->glEnable(GL_TEXTURE_2D);
     }
-    data->glMatrixMode(GL_PROJECTION);
-    data->glLoadIdentity();
-    data->glMatrixMode(GL_MODELVIEW);
-    data->glLoadIdentity();
+    data->updateSize = SDL_TRUE;
 
     return renderer;
 }
@@ -374,9 +372,10 @@ GL_ActivateRenderer(SDL_Renderer * renderer)
     if (SDL_GL_MakeCurrent(window->id, data->context) < 0) {
         return -1;
     }
-    data->glViewport(0, 0, window->w, window->h);
-    data->glOrtho(0.0, (GLdouble) window->w, (GLdouble) window->h, 0.0, 0.0,
-                  1.0);
+    if (data->updateSize) {
+        GL_DisplayModeChanged(renderer);
+        data->updateSize = SDL_FALSE;
+    }
     return 0;
 }
 
@@ -386,9 +385,14 @@ GL_DisplayModeChanged(SDL_Renderer * renderer)
     GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
     SDL_Window *window = SDL_GetWindowFromID(renderer->window);
 
+    data->glMatrixMode(GL_PROJECTION);
+    data->glLoadIdentity();
+    data->glMatrixMode(GL_MODELVIEW);
+    data->glLoadIdentity();
     data->glViewport(0, 0, window->w, window->h);
     data->glOrtho(0.0, (GLdouble) window->w, (GLdouble) window->h, 0.0, 0.0,
                   1.0);
+    return 0;
 }
 
 static __inline__ int
-- 
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