From 11d0bc47ab4e5dc187608b39ffd028acbb545fd1 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Mon, 19 Aug 2002 17:58:08 +0000
Subject: [PATCH] Added SDL_GL_STEREO for stereoscopic OpenGL contexts

---
 docs.html                          |  1 +
 include/SDL_video.h                |  3 ++-
 src/video/SDL_sysvideo.h           | 11 ++++++-----
 src/video/SDL_video.c              | 12 ++++++++----
 src/video/maccommon/SDL_macgl.c    |  3 +++
 src/video/quartz/SDL_QuartzVideo.m |  5 +++++
 src/video/wincommon/SDL_wingl.c    | 10 ++++++++++
 src/video/x11/SDL_x11gl.c          | 24 ++++++++++++++++--------
 8 files changed, 51 insertions(+), 18 deletions(-)

diff --git a/docs.html b/docs.html
index 43933edbd..318352d43 100644
--- a/docs.html
+++ b/docs.html
@@ -16,6 +16,7 @@ <H2>
 Major changes since SDL 1.0.0:
 </H2>
 <UL>
+	<LI> 1.2.5: Added SDL_GL_STEREO for stereoscopic OpenGL contexts
 	<LI> 1.2.5: Fixed VidMode error when running on XFree86 3.3
 	<LI> 1.2.5: Added initial support for PicoGUI (thanks Micah!)
 	<LI> 1.2.5: Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
diff --git a/include/SDL_video.h b/include/SDL_video.h
index 254a13a7c..1cdbc4966 100644
--- a/include/SDL_video.h
+++ b/include/SDL_video.h
@@ -215,7 +215,8 @@ typedef enum {
     SDL_GL_ACCUM_RED_SIZE,
     SDL_GL_ACCUM_GREEN_SIZE,
     SDL_GL_ACCUM_BLUE_SIZE,
-    SDL_GL_ACCUM_ALPHA_SIZE
+    SDL_GL_ACCUM_ALPHA_SIZE,
+	SDL_GL_STEREO
 } SDL_GLattr;
 
 /* flags for SDL_SetPalette() */
diff --git a/src/video/SDL_sysvideo.h b/src/video/SDL_sysvideo.h
index acc22643e..8d6fb1488 100644
--- a/src/video/SDL_sysvideo.h
+++ b/src/video/SDL_sysvideo.h
@@ -295,13 +295,14 @@ struct SDL_VideoDevice {
 		int blue_size;
 		int alpha_size;
 		int depth_size;
-	        int buffer_size;
+		int buffer_size;
 		int stencil_size;
 		int double_buffer;
-                int accum_red_size;
-                int accum_green_size;
-                int accum_blue_size;
-                int accum_alpha_size;
+		int accum_red_size;
+		int accum_green_size;
+		int accum_blue_size;
+		int accum_alpha_size;
+		int stereo;
 		int driver_loaded;
 		char driver_path[256];
 		void* dll_handle;
diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index 59cf95118..3027f0d22 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -226,6 +226,7 @@ int SDL_VideoInit (const char *driver_name, Uint32 flags)
 	video->gl_config.accum_green_size = 0;
 	video->gl_config.accum_blue_size = 0;
 	video->gl_config.accum_alpha_size = 0;
+	video->gl_config.stereo = 0;
 	
 	/* Initialize the video subsystem */
 	memset(&vformat, 0, sizeof(vformat));
@@ -1370,18 +1371,21 @@ int SDL_GL_SetAttribute( SDL_GLattr attr, int value )
 		case SDL_GL_STENCIL_SIZE:
 			video->gl_config.stencil_size = value;
 			break;
-	        case SDL_GL_ACCUM_RED_SIZE:
+		case SDL_GL_ACCUM_RED_SIZE:
 			video->gl_config.accum_red_size = value;
 			break;
-	        case SDL_GL_ACCUM_GREEN_SIZE:
+		case SDL_GL_ACCUM_GREEN_SIZE:
 			video->gl_config.accum_green_size = value;
 			break;
-	        case SDL_GL_ACCUM_BLUE_SIZE:
+		case SDL_GL_ACCUM_BLUE_SIZE:
 			video->gl_config.accum_blue_size = value;
 			break;
-	        case SDL_GL_ACCUM_ALPHA_SIZE:
+		case SDL_GL_ACCUM_ALPHA_SIZE:
 			video->gl_config.accum_alpha_size = value;
 			break;
+		case SDL_GL_STEREO:
+			video->gl_config.stereo = value;
+			break;
 		default:
 			SDL_SetError("Unknown OpenGL attribute");
 			retval = -1;
diff --git a/src/video/maccommon/SDL_macgl.c b/src/video/maccommon/SDL_macgl.c
index d4efe59b5..ac59a906f 100644
--- a/src/video/maccommon/SDL_macgl.c
+++ b/src/video/maccommon/SDL_macgl.c
@@ -46,6 +46,9 @@ int Mac_GL_Init(_THIS)
 	if ( this->gl_config.double_buffer ) {
 		attributes[i++] = AGL_DOUBLEBUFFER;
 	}
+	if ( this->gl_config.stereo ) {
+		attributes[i++] = AGL_STEREO;
+	}
 	if ( this->gl_config.depth_size != 0 ) {
 		attributes[i++] = AGL_DEPTH_SIZE;
 		attributes[i++] = this->gl_config.depth_size;
diff --git a/src/video/quartz/SDL_QuartzVideo.m b/src/video/quartz/SDL_QuartzVideo.m
index 55da900be..47e975f9c 100644
--- a/src/video/quartz/SDL_QuartzVideo.m
+++ b/src/video/quartz/SDL_QuartzVideo.m
@@ -1157,6 +1157,10 @@ static int QZ_SetupOpenGL (_THIS, int bpp, Uint32 flags) {
         attr[i++] = NSOpenGLPFADoubleBuffer;
     }
 
+    if ( this->gl_config.stereo ) {
+        attr[i++] = NSOpenGLPFAStereo;
+    }
+
     if ( this->gl_config.stencil_size != 0 ) {
         attr[i++] = NSOpenGLPFAStencilSize;
         attr[i++] = this->gl_config.stencil_size;
@@ -1245,6 +1249,7 @@ static int    QZ_GL_GetAttribute   (_THIS, SDL_GLattr attrib, int* value) {
         case SDL_GL_ACCUM_GREEN_SIZE: attr = GL_ACCUM_GREEN_BITS; break;
         case SDL_GL_ACCUM_BLUE_SIZE: attr = GL_ACCUM_BLUE_BITS; break;
         case SDL_GL_ACCUM_ALPHA_SIZE: attr = GL_ACCUM_ALPHA_BITS; break;
+        case SDL_GL_STEREO: attr = GL_STEREO; break;
         case SDL_GL_BUFFER_SIZE:
         {
             GLint bits = 0;
diff --git a/src/video/wincommon/SDL_wingl.c b/src/video/wincommon/SDL_wingl.c
index 478e3ac4f..caf8abde8 100644
--- a/src/video/wincommon/SDL_wingl.c
+++ b/src/video/wincommon/SDL_wingl.c
@@ -106,6 +106,9 @@ int WIN_GL_SetupWindow(_THIS)
 		if ( this->gl_config.double_buffer ) {
 			GL_pfd.dwFlags |= PFD_DOUBLEBUFFER;
 		}
+		if ( this->gl_config.stereo ) {
+			GL_pfd.dwFlags |= PFD_STEREO;
+		}
 		GL_pfd.iPixelType = PFD_TYPE_RGBA;
 		GL_pfd.cColorBits = this->gl_config.buffer_size;
 		GL_pfd.cRedBits = this->gl_config.red_size;
@@ -242,6 +245,13 @@ int WIN_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
 	    case SDL_GL_ACCUM_ALPHA_SIZE:
 		*value = GL_pfd.cAccumAlphaBits;
 		break;
+	    case SDL_GL_STEREO:
+		if ( GL_pfd.dwFlags & PFD_STEREO ) {
+			*value = 1;
+		} else {
+			*value = 0;
+		}
+		break;
 	    default:
 		retval = -1;
 		break;
diff --git a/src/video/x11/SDL_x11gl.c b/src/video/x11/SDL_x11gl.c
index 5353735f3..a76cdb17d 100644
--- a/src/video/x11/SDL_x11gl.c
+++ b/src/video/x11/SDL_x11gl.c
@@ -67,8 +67,8 @@ XVisualInfo *X11_GL_GetVisual(_THIS)
 	}
 
         /* Setup our GLX attributes according to the gl_config. */
-        i = 0;
-        attribs[i++] = GLX_RGBA;
+	i = 0;
+	attribs[i++] = GLX_RGBA;
 	attribs[i++] = GLX_RED_SIZE;
 	attribs[i++] = this->gl_config.red_size;
 	attribs[i++] = GLX_GREEN_SIZE;
@@ -82,8 +82,8 @@ XVisualInfo *X11_GL_GetVisual(_THIS)
 	}
 
 	if( this->gl_config.buffer_size ) {
-                attribs[i++] = GLX_BUFFER_SIZE;
-	        attribs[i++] = this->gl_config.buffer_size;
+		attribs[i++] = GLX_BUFFER_SIZE;
+		attribs[i++] = this->gl_config.buffer_size;
 	}
 
 	if( this->gl_config.double_buffer ) {
@@ -99,25 +99,30 @@ XVisualInfo *X11_GL_GetVisual(_THIS)
 	}
 
 	if( this->gl_config.accum_red_size ) {
-	        attribs[i++] = GLX_ACCUM_RED_SIZE;
+		attribs[i++] = GLX_ACCUM_RED_SIZE;
 		attribs[i++] = this->gl_config.accum_red_size;
 	}
 
 	if( this->gl_config.accum_green_size ) {
-	        attribs[i++] = GLX_ACCUM_GREEN_SIZE;
+		attribs[i++] = GLX_ACCUM_GREEN_SIZE;
 		attribs[i++] = this->gl_config.accum_green_size;
 	}
 
 	if( this->gl_config.accum_blue_size ) {
-	        attribs[i++] = GLX_ACCUM_BLUE_SIZE;
+		attribs[i++] = GLX_ACCUM_BLUE_SIZE;
 		attribs[i++] = this->gl_config.accum_blue_size;
 	}
 
 	if( this->gl_config.accum_alpha_size ) {
-	        attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
+		attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
 		attribs[i++] = this->gl_config.accum_alpha_size;
 	}
 
+	if( this->gl_config.stereo ) {
+		attribs[i++] = GLX_STEREO;
+		attribs[i++] = this->gl_config.stereo;
+	}
+
 #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
 	attribs[i++] = GLX_X_VISUAL_TYPE;
 	attribs[i++] = GLX_DIRECT_COLOR;
@@ -288,6 +293,9 @@ int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
 	    case SDL_GL_ACCUM_ALPHA_SIZE:
 		glx_attrib = GLX_ACCUM_ALPHA_SIZE;
 		break;
+	    case SDL_GL_STEREO:
+		glx_attrib = GLX_STEREO;
+		break;
 	    default:
 		return(-1);
 	}