# HG changeset patch
# User Sam Lantinga <slouken@libsdl.org>
# Date 1084730787 0
# Node ID 416158ec61a08bae49081f8148a1cf2bc204fc8f
# Parent  eac8c69b57069e8c96ce7b52659bcb1bb97e1d4c
Date: Sat, 10 Apr 2004 10:05:46 +0200
From: Christian Walther
Subject: [SDL] OpenGL Accumulation Buffer on Mac OS X

Is there a reason for not having OpenGL accumulation buffer support in
SDL 1.2.7 (and as far as I have checked also in the current CVS) on Mac OS
X?

Maybe I am doing something wrong, but it seems very easy to add (at least
it works for for me in 10.3.3) - just add

  if ( this->gl_config.accum_red_size + this->gl_config.accum_green_size + this->gl_config.accum_blue_size + this->gl_config.accum_alpha_size > 0) {
    attr[i++] = NSOpenGLPFAAccumSize;
    attr[i++] = this->gl_config.accum_red_size + this->gl_config.accum_green_size + this->gl_config.accum_blue_size + this->gl_config.accum_alpha_size;
  }

to QZ_SetupOpenGL() in SDL_QuartzGL.m

diff -r eac8c69b5706 -r 416158ec61a0 src/video/quartz/SDL_QuartzGL.m
--- a/src/video/quartz/SDL_QuartzGL.m	Sun May 16 18:02:48 2004 +0000
+++ b/src/video/quartz/SDL_QuartzGL.m	Sun May 16 18:06:27 2004 +0000
@@ -86,6 +86,14 @@
         attr[i++] = this->gl_config.stencil_size;
     }
 
+    if ( (this->gl_config.accum_red_size +
+          this->gl_config.accum_green_size +
+          this->gl_config.accum_blue_size +
+          this->gl_config.accum_alpha_size) > 0 ) {
+        attr[i++] = NSOpenGLPFAAccumSize;
+        attr[i++] = this->gl_config.accum_red_size + this->gl_config.accum_green_size + this->gl_config.accum_blue_size + this->gl_config.accum_alpha_size;
+    }
+
     if ( this->gl_config.multisamplebuffers != 0 ) {
         attr[i++] = NSOpenGLPFASampleBuffers;
         attr[i++] = this->gl_config.multisamplebuffers;