src/video/uikit/SDL_uikitopenglview.m
author Sam Lantinga <slouken@libsdl.org>
Mon, 31 Oct 2011 05:56:58 -0400
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_UIKIT
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#import <QuartzCore/QuartzCore.h>
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#import <OpenGLES/EAGLDrawable.h>
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#import "SDL_uikitopenglview.h"
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@implementation SDL_uikitopenglview
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@synthesize context;
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+ (Class)layerClass
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{
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    return [CAEAGLLayer class];
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}
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- (id)initWithFrame:(CGRect)frame
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      retainBacking:(BOOL)retained
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      rBits:(int)rBits
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      gBits:(int)gBits
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      bBits:(int)bBits
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      aBits:(int)aBits
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      depthBits:(int)depthBits
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      stencilBits:(int)stencilBits
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      majorVersion:(int)majorVersion
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{
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    depthBufferFormat = 0;
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    if ((self = [super initWithFrame:frame])) {
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        const BOOL useStencilBuffer = (stencilBits != 0);
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        const BOOL useDepthBuffer = (depthBits != 0);
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        NSString *colorFormat = nil;
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        if (rBits == 8 && gBits == 8 && bBits == 8) {
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            /* if user specifically requests rbg888 or some color format higher than 16bpp */
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            colorFormat = kEAGLColorFormatRGBA8;
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        } else {
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            /* default case (faster) */
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            colorFormat = kEAGLColorFormatRGB565;
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        }
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        /* Get the layer */
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        CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
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        eaglLayer.opaque = YES;
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        eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
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                                        [NSNumber numberWithBool: retained], kEAGLDrawablePropertyRetainedBacking, colorFormat, kEAGLDrawablePropertyColorFormat, nil];
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        if (majorVersion > 1) {
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            context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES2];
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        } else {
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            context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES1];
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        }
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        if (!context || ![EAGLContext setCurrentContext:context]) {
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            [self release];
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            return nil;
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        }
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        /* create the buffers */
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        glGenFramebuffersOES(1, &viewFramebuffer);
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        glGenRenderbuffersOES(1, &viewRenderbuffer);
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        glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
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        glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
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        [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
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        glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
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        glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
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        glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
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        if ((useDepthBuffer) || (useStencilBuffer)) {
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            if (useStencilBuffer) {
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                /* Apparently you need to pack stencil and depth into one buffer. */
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                depthBufferFormat = GL_DEPTH24_STENCIL8_OES;
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            } else if (useDepthBuffer) {
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                /* iOS only has 24-bit depth buffers, even with GL_DEPTH_COMPONENT16_OES */
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                depthBufferFormat = GL_DEPTH_COMPONENT24_OES;
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            }
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            glGenRenderbuffersOES(1, &depthRenderbuffer);
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            glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
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            glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight);
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            if (useDepthBuffer) {
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                glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
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            }
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            if (useStencilBuffer) {
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                glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_STENCIL_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
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            }
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        }
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        if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
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            return NO;
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        }
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        /* end create buffers */
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        // !!! FIXME: use the screen this is on!
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        /* Use the main screen scale (for retina display support) */
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        if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
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            self.contentScaleFactor = [UIScreen mainScreen].scale;
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        self.autoresizingMask = 0;  // don't allow autoresize, since we need to do some magic in -(void)updateFrame.
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    }
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    return self;
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}
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- (void)updateFrame
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{
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    glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
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    glBindRenderbufferOES(GL_RENDERBUFFER_OES, 0);
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    glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, 0);
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    glDeleteRenderbuffersOES(1, &viewRenderbuffer);
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    glGenRenderbuffersOES(1, &viewRenderbuffer);
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    glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
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    [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
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    glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
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    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
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    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
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    if (depthRenderbuffer != 0) {
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        glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
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        glRenderbufferStorageOES(GL_RENDERBUFFER_OES, depthBufferFormat, backingWidth, backingHeight);
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    }
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    // !!! FIXME: use the screen this is on!
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    /* Use the main screen scale (for retina display support) */
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    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
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        self.contentScaleFactor = [UIScreen mainScreen].scale;
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}
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- (void)setCurrentContext
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{
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    [EAGLContext setCurrentContext:context];
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}
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- (void)swapBuffers
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{
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    glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
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    [context presentRenderbuffer:GL_RENDERBUFFER_OES];
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}
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- (void)layoutSubviews
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{
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    [EAGLContext setCurrentContext:context];
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}
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- (void)destroyFramebuffer
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{
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    glDeleteFramebuffersOES(1, &viewFramebuffer);
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    viewFramebuffer = 0;
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    glDeleteRenderbuffersOES(1, &viewRenderbuffer);
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    viewRenderbuffer = 0;
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    if (depthRenderbuffer) {
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        glDeleteRenderbuffersOES(1, &depthRenderbuffer);
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        depthRenderbuffer = 0;
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    }
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}
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- (void)dealloc
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{
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    [self destroyFramebuffer];
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    if ([EAGLContext currentContext] == context) {
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        [EAGLContext setCurrentContext:nil];
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    }
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    [context release];
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    [super dealloc];
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}
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@end
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#endif /* SDL_VIDEO_DRIVER_UIKIT */
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/* vi: set ts=4 sw=4 expandtab: */