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POHow to Draw pixel data taken from the backbuffer back to itself?
 

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  1. POHow to Draw pixel data taken from the backbuffer back to itself?
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    <p>I'm working on a mobile application for Symbian 5th edition using <strong>OpenGLES</strong>.<br> This application is a pretty standard 2D app, and I make no use of the DepthBuffer.</p> <p>I need to grab a snapshot of the display and then draw the very same snapshot back to the backbuffer.</p> <p>I'm using <code>glReadPixels((GLint)0, (GLint)0, (GLint)nWidth-1, (GLint)nHeight-1, GL_RGB, GL_UNSIGNED_BYTE, m_pPixelData) </code></p> <p>in order to get the pixel data I need, but I'm rather new to OpenGLES and I don't know how to draw the data back to the backbuffer. (in OpenGL its easy using DrawPixels..)</p> <p>I've read that I should generate a texture from the data, so I did. But now I'm not sure how to draw this texture.</p> <p>Do I need to draw it as a texture of a Rectangular element ? if so than how am I suppose to define this rect ? ( the coordinates just doesn't make sense to me..)</p> <p>The display size is 480x640 and here is the code I want to use in order to draw the rect:</p> <pre><code> glEnable(GL_TEXTURE_2D); //displayTex is my texture built out of the pixel data glBindTexture(GL_TEXTURE_2D, m_pESSharedData-&gt;displayTex); //Bottom glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f); glVertex3f(-2.5f, -2.5f, 2.5f); glTexCoord2f(1.0f, 0.0f); glVertex3f(2.5f, -2.5f, 2.5f); glTexCoord2f(1.0f, 1.0f); glVertex3f(2.5f, -2.5f, -2.5f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-2.5f, -2.5f, -2.5f); glEnd(); </code></pre> <p>Note that above code is something I've picked up along the way, and I think this is the outline of what I'm suppose to do. feel free to take me off this track. :)</p> <p>I thank you for your time.</p>
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    1. COI'll walk you through it if you're still checking on your question. I don't know enough about your platform to help with that, but I can help you with OpenGL. How familiar are you with coordinate systems (like projection, modelview, etc)?
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    2. COHey GMan and 10q for you reply, I've read a few tutorials and I've came across projection, modelview etc.. So i know the basics of it. Can you help with the definitions of this rect/binding a texture to it, under OpenGL ES ?
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