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POOpenGL render to texture - black screen
 

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  1. POOpenGL render to texture - black screen
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    <p>I am rendering to a frame buffer, and then I want to use that as a texture.</p> <p>I can save the frame buffer to a file using <code>glReadPixels</code> so I am sure that I am rendering OK.</p> <p>I can bind to fixed texture and render that OK.</p> <p>But I cannot bind to the frame buffer to render that in place of the fixed texture.</p> <pre><code> //setup: private void setupRenderToTexture() { fb = new int[numberOfBuffers]; depthRb = new int[numberOfBuffers]; renderTex = new int[numberOfBuffers]; texBuffer = new IntBuffer[numberOfBuffers]; // generate GLES20.glGenFramebuffers(fb.length, fb, 0); GLES20.glGenRenderbuffers(depthRb.length, depthRb, 0); GLES20.glGenTextures(renderTex.length, renderTex, 0); GLErrorHandler.checkGlError("glGenFramebuffers"); for (int i = 0; i &lt; fb.length; i++) { GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fb[i]); // generate color texture GLState.Instance.bindTexture(0, renderTex[i]); // parameters GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, // GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE); GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_REPEAT); GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, // GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE); GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_REPEAT); GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR); GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR); // create it // create an empty intbuffer first? int[] fileData = new int[width * height]; texBuffer[i] = IntBuffer.wrap(fileData); GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, width, height, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, texBuffer[i]); GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, renderTex[i], 0); // create render buffer and bind 16-bit depth buffer GLES20.glBindRenderbuffer(GLES20.GL_RENDERBUFFER, depthRb[i]); GLES20.glRenderbufferStorage(GLES20.GL_RENDERBUFFER, GLES20.GL_DEPTH_COMPONENT16, width, height); GLErrorHandler.checkGlError("glRenderbufferStorage or above"); } GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0); } </code></pre> <p>Use the frame buffer:</p> <pre><code>GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fb[0]); </code></pre> <p>Save the frame buffer (for testing):</p> <pre><code>GLES20.glReadPixels(sourceX, sourceY, width, height, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, ib); </code></pre> <p>Then to render to screen:</p> <pre><code>GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0); GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fb[0]); GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texture); //some simple texture works but: GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, renderTex[0]); //frame buffer texture does not work </code></pre> <p>All I get is a black screen if I bind to <code>renderTex[0]</code></p>
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    1. USweston
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    1. COMaybe your problem is similar to this [one](http://stackoverflow.com/questions/6802266/how-to-use-glreadpixels-with-android-usually-get-zeros)
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      1. USFabien R
    2. CO@FabienR Didn't help, thank you though!
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      1. USweston
 

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