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POHow do I convert window coordinates to 2-D OpenGL ES coordinates?
 

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  1. POHow do I convert window coordinates to 2-D OpenGL ES coordinates?
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    <p>I am developing an iPhone game using OpenGL ES. I want to move the player using touch coordinates using code like the following: </p> <pre><code>- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { CGPoint point=[[touches anyObject]locationInView:self.view]; [eaglView render:point.x]; }// end </code></pre> <p>then rendering within my OpenGL ES view using the following code: </p> <pre><code>- (void) render:(float )delta { if(initialized==0) { [self initOpenGL]; } static const GLfloat squareVertices[] = { -0.5f, -0.33f, 0.5f, -0.33f, -0.5f, 0.33f, 0.5f, 0.33f, }; static const GLubyte squareColors[] = { 255, 255, 0, 255, 0, 255, 255, 255, 0, 0, 0, 0, 255, 0, 255, 255, }; float transY = delta; // This application only creates a single context which is already set current at this point. // This call is redundant, but needed if dealing with multiple contexts. [EAGLContext setCurrentContext:context]; // This application only creates a single default framebuffer which is already bound at this point. // This call is redundant, but needed if dealing with multiple framebuffers. //glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer); glViewport(0, 0, backingWidth, backingHeight); glClearColor(0.5f, 0.5f, 0.5f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); // Use shader program //glUseProgram(program); // Update uniform value //glUniform1f(uniforms[UNIFORM_TRANSLATE], (GLfloat)transY); //transY += 0.075f; glVertexPointer(2, GL_FLOAT, 0, squareVertices); glEnableClientState(GL_VERTEX_ARRAY); glColorPointer(4, GL_UNSIGNED_BYTE, 0, squareColors); glTranslatef(0.0f, (GLfloat)(sinf(transY)/2.0f), 0.0f); //transY += 0.0001f; glEnableClientState(GL_COLOR_ARRAY); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_COLOR_ARRAY); // Update attribute values // Validate program before drawing. This is a good check, but only really necessary in a debug build. // DEBUG macro must be defined in your debug configurations if that's not already the case. // Draw // This application only creates a single color renderbuffer which is already bound at this point. // This call is redundant, but needed if dealing with multiple renderbuffers. // glBindRenderbuffer(GL_RENDERBUFFER, renderBuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES,renderBuffer); [context presentRenderbuffer:GL_RENDERBUFFER_OES]; } </code></pre> <p>I can't translate the object using window coordinates, so I have to convert it into normalized device coordinates. How would I go about converting from window coordinates to ones that I could use for translating my OpenGL ES model?</p>
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