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  1. Shader:
  2.         #version 430
  3.         layout(local_size_x=128) in;
  4.  
  5.         layout(r32f, location = 0) uniform imageBuffer data;
  6.  
  7.         shared float local[256];
  8.         void main() {
  9.            int N = imageSize(data);
  10.            int index = int(gl_GlobalInvocationID);
  11.            int localindex = int(gl_LocalInvocationIndex);
  12.  
  13.            local[localindex] = localindex;
  14.            local[localindex+128] = localindex+128;
  15.  
  16.            groupMemoryBarrier();
  17.            imageStore(data, index, vec4(local[localindex]));
  18.            imageStore(data, index+128, vec4(local[localindex+128]));
  19.         }
  20.  
  21. code:
  22.  
  23.     std::vector<float> data(256);
  24.     std::fill(data.begin(), data.end(), -1.0f);
  25.  
  26.     GLuint buffer;
  27.  
  28.     glGenBuffers(1, &buffer);
  29.     glBindBuffer(GL_TEXTURE_BUFFER, buffer);
  30.     glBufferData(GL_TEXTURE_BUFFER, sizeof(float)*data.size(), 0, GL_STATIC_DRAW);                  
  31.  
  32.     GLuint buffer_texture;
  33.  
  34.     glGenTextures(1, &buffer_texture);
  35.     glBindTexture(GL_TEXTURE_BUFFER, buffer_texture);
  36.     glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, buffer);
  37.  
  38.     glBindImageTexture(0, buffer_texture, 0, GL_FALSE, 0, GL_READ_WRITE, GL_R32F);
  39.  
  40.     glUseProgram(test_program);
  41.     glUniform1i(0, 0);
  42.  
  43.     glDispatchCompute(1, 1, 1);
  44.  
  45.     glGetBufferSubData(GL_TEXTURE_BUFFER, 0, sizeof(float)*data.size(), &data[0]);
  46.  
  47.     for(size_t i = 0;i<data.size();i+=1)
  48.     {
  49.         if(i%16==0) std::cout << std::endl;
  50.         std::cout << std::setw(4) << data[i] << ' ';
  51.     }
  52.     std::cout << std::endl;
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https://ideone.com/aI4WL
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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