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POUsing FBO to render YUV data
 

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  1. POUsing FBO to render YUV data
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    <p>I was able to render YUV image on the screen using shaders. To improve performance I want to use FBO. But I am not able to do it.</p> <p>My initialization code is as below </p> <pre><code>void opengl_init(int w, int h) { glGenFramebuffers(1, &amp;framebuffer); checkGlError("glGenFramebuffers"); glBindFramebuffer(GL_FRAMEBUFFER, framebuffer); checkGlError("glBindFramebuffer"); glActiveTexture(GL_TEXTURE0); glGenTextures(1, &amp;gYTexture); glBindTexture(GL_TEXTURE_2D, gYTexture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, FRAME_WIDTH, FRAME_HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); glBindTexture(GL_TEXTURE_2D, 0); glGenRenderbuffers(1, &amp;colorbuffer); checkGlError("glGenRenderbuffers"); glBindRenderbuffer(GL_RENDERBUFFER, colorbuffer); checkGlError("glBindRenderbuffer"); glRenderbufferStorage(GL_RENDERBUFFER, GL_RGB565, FRAME_WIDTH, FRAME_HEIGHT); checkGlError("glRenderbufferStorage"); glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, depthbuffer); checkGlError("glFramebufferRenderbuffer"); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, gYTexture, 0); checkGlError("glFramebufferTexture2D"); int status = glCheckFramebufferStatus(GL_FRAMEBUFFER); printf("Framebuffer is not complete: *status* = %d", status); if (status != GL_FRAMEBUFFER_COMPLETE) { printf("Framebuffer is not complete: *status* = %d", status); } glBindFramebuffer(GL_FRAMEBUFFER, 0); checkGlError("glBindFramebuffer"); glGenBuffers(1, ioBuf); checkGlError("glGenBuffers"); glActiveTexture(GL_TEXTURE1); glGenTextures(1, &amp;gUTexture); glBindTexture(GL_TEXTURE_2D, gUTexture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glActiveTexture(GL_TEXTURE2); glGenTextures(1, &amp;gVTexture); glBindTexture(GL_TEXTURE_2D, gVTexture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glViewport(0, 0, w, h); checkGlError("glViewport"); } </code></pre> <p>I render my frame using the below code</p> <pre><code>void opengl_renderframe(void *yuvbuf,int framewidth, int frameheight) { static void *ubuf, *vbuf; ubuf = (char *)yuvbuf + (framewidth * frameheight); vbuf = (char *)ubuf + ((framewidth * frameheight) / 4); glBindFramebuffer(GL_FRAMEBUFFER, framebuffer); checkGlError("glBindFramebuffer"); glClearColor(0.0f, 0.0f, 1.0f, 1.0f); checkGlError("glClearColor"); glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); checkGlError("glClear"); glUseProgram(gProgram); checkGlError("glUseProgram"); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, gYTexture); glBindBuffer(GL_ARRAY_BUFFER, ioBuf); checkGlError("glBindBuffer"); glBufferData(GL_ARRAY_BUFFER, (FRAME_WIDTH * FRAME_HEIGHT) , yuvbuf, GL_STATIC_DRAW); checkGlError("glBufferData"); glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, FRAME_WIDTH, FRAME_HEIGHT, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, NULL); checkGlError("glTexImage2D"); glBindBuffer(GL_ARRAY_BUFFER, 0); checkGlError("glBindBuffer"); glUniform1i(Ysamp, 0); glActiveTexture(GL_TEXTURE1); glBindTexture(GL_TEXTURE_2D, gUTexture); glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, framewidth/2, frameheight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, ubuf ); glUniform1i(Usamp, 1); glActiveTexture(GL_TEXTURE2); glBindTexture(GL_TEXTURE_2D, gVTexture); glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, framewidth/2, frameheight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, vbuf ); glUniform1i(Vsamp, 2); glVertexAttribPointer(gvPositionHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices); checkGlError("glVertexAttribPointer"); glEnableVertexAttribArray(gvPositionHandle); checkGlError("glEnableVertexAttribArray"); glVertexAttribPointer(gaTextureCoordHandle, 2, GL_FLOAT, GL_FALSE, 0, gTriangleVertices2); checkGlError("glVertexAttribPointer"); glEnableVertexAttribArray(gaTextureCoordHandle); checkGlError("glEnableVertexAttribArray"); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); checkGlError("glDrawArrays"); glBindFramebuffer(GL_FRAMEBUFFER, 0); checkGlError("glBindFramebuffer 0"); } </code></pre> <p>my fragment shader to render only Y data is as below</p> <pre><code>static const char gGrayScaleFragmentShader[] = "precision mediump float;\n" "varying vec2 vTextureCoord;\n" "uniform sampler2D sTexture;\n" "void main() {\n" " gl_FragColor = texture2D(sTexture, vTextureCoord);\n" "}\n"; </code></pre>
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    1. PTQuestion
    1. USgenpfault
    1. USuser1638998
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    1. COWhy do you think a FBO will help you to imporove the performance? That's not what a FBO is meant for.
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      1. POUsing FBO to render YUV data
      1. USdatenwolf
    2. CO@datenwolf It's possible they were thinking of rendering to an FBO with a resolution much smaller than the window / screen.
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      1. POUsing FBO to render YUV data
      1. USDaniel Kinsman
 

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