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POUsing depth buffer on iOS with OpenGL ES 1.1
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  1. POUsing depth buffer on iOS with OpenGL ES 1.1
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    copied!<p>I'm trying to get a depth buffer working so I can start making a game for iOS. I'm fine with OpenGL and Objective-C for OSX but this is my first time making an iphone application.</p> <p>I removed the ES1Renderer and ES2Renderer classes and moved the ES1 code into the EAGLView class. The default animation worked when I did that. When I tried to use perspective it went wrong. I get a white screen now. Can someone tell me what I'm doing wrong?</p> <p>In the initialisation method:</p> <pre><code>// Create default framebuffer object. glGenFramebuffersOES(1, &amp;defaultFramebuffer); glGenRenderbuffersOES(1, &amp;colorRenderbuffer); glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer); glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, colorRenderbuffer); //Initialisation code for the game's graphics and to develop the scene glEnable(GL_DEPTH_TEST); //Enables Depth Testing glDepthFunc(GL_LEQUAL); glDepthMask(GL_TRUE); //glEnable(GL_CULL_FACE); //glCullFace(GL_FRONT); //Setup projection matrix glMatrixMode(GL_PROJECTION); glLoadIdentity(); double xmax = 0.04142135624 * ((float) backingWidth)/backingHeight; glFrustumf(-xmax, xmax, -0.04142135624, 0.04142135624, 0.1, 2000); //The ymax and min have been precalculated glMatrixMode(GL_MODELVIEW); //Select The Modelview Matrix glLoadIdentity(); </code></pre> <p>In the drawView method:</p> <pre><code> static const GLfloat squareVertices[] = { 1, 1,-0.1f, -1, 1,-0.1f, 1, -1,0.1f, -1, -1,0.1f, }; static const GLubyte squareColors[] = { 0,0,200,255, 40,90,250,255, 0,0,200,255, 50,100,230,255, }; glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glClear(GL_DEPTH_BUFFER_BIT); glVertexPointer(3, GL_FLOAT, 0, squareVertices); glEnableClientState(GL_VERTEX_ARRAY); glColorPointer(4, GL_UNSIGNED_BYTE, 0, squareColors); glEnableClientState(GL_COLOR_ARRAY); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); [context presentRenderbuffer:GL_RENDERBUFFER_OES]; </code></pre> <p>In the layoutSubviews method:</p> <pre><code>// Allocate color buffer backing based on the current layer size glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer); [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*) self.layer]; glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &amp;backingWidth); glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &amp;backingHeight); glGenRenderbuffersOES(1, &amp;depthRenderbuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer); glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, backingWidth, backingHeight); glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer); if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) { NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) ); return NO; } return YES; [self drawView:nil]; </code></pre> <p>I've done everything it seems I have to do. I don't know why it's so much more complicated for iOS.</p> <p>Thankyou for any help.</p>
 

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