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POHow do you represent an image in OpenCL
 

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  1. POHow do you represent an image in OpenCL
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    <p>I have sample code but it completely leaves out what my (void*)should_be!</p> <p>I setup a cl_image_desc, cl_image_format, buffer, origin, and region:</p> <pre><code>cl_image_desc desc; desc.image_type = CL_MEM_OBJECT_IMAGE2D; desc.image_width = width; desc.image_height = height; desc.image_depth = 0; desc.image_array_size = 0; desc.image_row_pitch = 0; desc.image_slice_pitch = 0; desc.num_mip_levels = 0; desc.num_samples = 0; desc.buffer = NULL; cl_image_format format; format.image_channel_order = CL_R; format.image_channel_data_type = CL_FLOAT; cl_mem bufferSourceImage = clCreateImage(context, CL_MEM_READ_ONLY, &amp;format, &amp;desc, NULL, NULL); size_t origin[3] = {0, 0, 0}; size_t region[3] = {width, height,1}; </code></pre> <p>In this next snippet sourceImage is a void pointer to my image. But what is my image? For every pixel there are r, g, b, a, x, and y values. </p> <pre><code>clEnqueueWriteImage(queue, bufferSourceImage, CL_TRUE, origin, region, 0, 0, sourceImage, 0, NULL, NULL); </code></pre> <p>How do I turn my image (a bunch of (r,g,b,a,x,y)'s) into a suitable array? </p> <p>This is the kernel they provide:</p> <pre><code>__kernel void convolution(__read_only image2d_t sourceImage, __write_only image2d_t outputImage, int rows, int cols, __constant float* filter, int filterWidth, sampler_t sampler) { int column = get_global_id(0); int row = get_global_id(1); int halfWidth = (int)(filterWidth/2); float4 sum = {0.0f, 0.0f, 0.0f, 0.0f}; int filterIdx = 0; int2 coords; for(int i = -halfWidth; i &lt;= halfWidth; i++) { coords.y = row + i; for(int i2 = -halfWidth; i2 &lt;= halfWidth; i2++) { coords.x = column + i2; float4 pixel; pixel = read_imagef(sourceImage, sampler, coords); sum.x += pixel.x * filter[filterIdx++]; } } if(myRow &lt; rows &amp;&amp; myCol &lt; cols) { coords.x = column; coords.y = row; write_imagef(outputImage, coords, sum); } } </code></pre>
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