My compute coordinates function is meant to capture the global coordinates given by the invocation id.
The compute shader is very simple:
#version 430
layout(local_size_x = 16, local_size_y = 16) in;
layout(binding = 0, rgba32f) writeonly uniform image2D output_image;
void main()
{
imageStore(output_image, ivec2(gl_GlobalInvocationID.xy), vec4(gl_GlobalInvocationID.x, gl_GlobalInvocationID.y, 0, 0));
}The C++ code to call the shader is:
Mat compute_coords(
const int size_x,
const int size_y,
const GLuint& coordinates_compute_shader_program)
{
vector<float>output_pixels(4 * size_x * size_y);
glEnable(GL_TEXTURE_2D);
GLuint tex_output = 0;
glGenTextures(1, &tex_output);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, tex_output);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, size_x, size_y, 0, GL_RGBA, GL_FLOAT, NULL);
glBindImageTexture(0, tex_output, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F);
// Use the compute shader
glUseProgram(coordinates_compute_shader_program);
glUniform1i(glGetUniformLocation(coordinates_compute_shader_program, "output_image"), 0);
// Run compute shader
glDispatchCompute((GLuint)size_x, (GLuint)size_y, 1);
// Wait for compute shader to finish
glMemoryBarrier(GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
// Copy output pixel array to CPU as texture 0
glActiveTexture(GL_TEXTURE0);
glBindImageTexture(0, tex_output, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F);
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, &output_pixels[0]);
glDeleteTextures(1, &tex_output);
Mat uc_output_small(size_x, size_y, CV_16UC4);
for (size_t x = 0; x < (4 * uc_output_small.rows * uc_output_small.cols); x += 4)
{
uc_output_small.data[x + 0] = (output_pixels[x + 0]);
uc_output_small.data[x + 1] = (output_pixels[x + 1]);
uc_output_small.data[x + 2] = (output_pixels[x + 2]);
uc_output_small.data[x + 3] = (output_pixels[x + 3]);
}
cout << uc_output_small << endl;
return uc_output_small;
}The question is why does the output for cout << uc_output_small << endl; look like this?
OpenGL 4.3 initialization OK
[0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8, 0, 9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 15, 0, 16, 0, 17, 0, 18, 0, 19, 0, 20, 0, 21, 0, 22, 0, 23, 0, 24, 0, 25, 0, 26, 0, 27, 0, 28, 0, 29, 0, 30, 0, 31, 0, 32, 0, 33, 0, 34, 0, 35, 0, 36, 0, 37, 0, 38, 0, 39, 0, 40, 0, 41, 0, 42, 0, 43, 0, 44, 0, 45, 0, 46, 0, 47, 0, 48, 0, 49, 0, 50, 0, 51, 0, 52, 0, 53, 0, 54, 0, 55, 0, 56, 0, 57, 0, 58, 0, 59, 0, 60, 0, 61, 0, 62, 0, 63, 0, 64, 0, 65, 0, 66, 0, 67, 0, 68, 0, 69, 0, 70, 0, 71, 0, 72, 0, 73, 0, 74, 0, 75, 0, 76, 0, 77, 0, 78, 0, 79, 0, 80, 0, 81, 0, 82, 0, 83, 0, 84, 0, 85, 0, 86, 0, 87, 0, 88, 0, 89, 0, 90, 0, 91, 0, 92, 0, 93, 0, 94, 0, 95, 0, 96, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 105, 0, 106, 0, 107, 0, 108, 0, 109, 0, 110, 0, 111, 0, 112, 0, 113, 0, 114, 0, 115, 0, 116, 0, 117, 0, 118, 0, 119, 0, 120, 0, 121, 0, 122, 0, 123, 0, 124, 0, 125, 0, 126, 0, 127, 0, 256, 0, 257, 0, 258, 0, 259, 0, 260, 0, 261, 0, 262, 0, 263, 0, 264, 0, 265, 0, 266, 0, 267, 0, 268, 0, 269, 0, 270, 0, 271, 0, 272, 0, 273, 0, 274, 0, 275, 0, 276, 0, 277, 0, 278, 0, 279, 0, 280, 0, 281, 0, 282, 0, 283, 0, 284, 0, 285, 0, 286, 0, 287, 0, 288, 0, 289, 0, 290, 0, 291, 0, 292, 0, 293, 0, 294, 0, 295, 0, 296, 0, 297, 0, 298, 0, 299, 0, 300, 0, 301, 0, 302, 0, 303, 0, 304, 0, 305, 0, 306, 0, 307, 0, 308, 0, 309, 0, 310, 0, 311, 0, 312, 0, 313, 0, 314, 0, 315, 0, 316, 0, 317, 0, 318, 0, 319, 0, 320, 0, 321, 0, 322, 0, 323, 0, 324, 0, 325, 0, 326, 0, 327, 0, 328, 0, 329, 0, 330, 0, 331, 0, 332, 0, 333, 0, 334, 0, 335, 0, 336, 0, 337, 0, 338, 0, 339, 0, 340, 0, 341, 0, 342, 0, 343, 0, 344, 0, 345, 0, 346, 0, 347, 0, 348, 0, 349, 0, 350, 0, 351, 0, 352, 0, 353, 0, 354, 0, 355, 0, 356, 0, 357, 0, 358, 0, 359, 0, 360, 0, 361, 0, 362, 0, 363, 0, 364, 0, 365, 0, 366, 0, 367, 0, 368, 0, 369, 0, 370, 0, 371, 0, 372, 0, 373, 0, 374, 0, 375, 0, 376, 0, 377, 0, 378, 0, 379, 0, 380, 0, 381, 0, 382, 0, 383, 0;
512, 0, 513, 0, 514, 0, 515, 0, 516, 0, 517, 0, 518, 0, 519, 0, 520, 0, 521, 0, 522, 0, 523, 0, 524, 0, 525, 0, 526, 0, 527, 0, 528, 0, 529, 0, 530, 0, 531, 0, 532, 0, 533, 0, 534, 0, 535, 0, 536, 0, 537, 0, 538, 0, 539, 0, 540, 0, 541, 0, 542, 0, 543, 0, 544, 0, 545, 0, 546, 0, 547, 0, 548, 0, 549, 0, 550, 0, 551, 0, 552, 0, 553, 0, 554, 0, 555, 0, 556, 0, 557, 0, 558, 0, 559, 0, 560, 0, 561, 0, 562, 0, 563, 0, 564, 0, 565, 0, 566, 0, 567, 0, 568, 0, 569, 0, 570, 0, 571, 0, 572, 0, 573, 0, 574, 0, 575, 0, 576, 0, 577, 0, 578, 0, 579, 0, 580, 0, 581, 0, 582, 0, 583, 0, 584, 0, 585, 0, 586, 0, 587, 0, 588, 0, 589, 0, 590, 0, 591, 0, 592, 0, 593, 0, 594, 0, 595, 0, 596, 0, 597, 0, 598, 0, 599, 0, 600, 0, 601, 0, 602, 0, 603, 0, 604, 0, 605, 0, 606, 0, 607, 0, 608, 0, 609, 0, 610, 0, 611, 0, 612, 0, 613, 0, 614, 0, 615, 0, 616, 0, 617, 0, 618, 0, 619, 0, 620, 0, 621, 0, 622, 0, 623, 0, 624, 0, 625, 0, 626, 0, 627, 0, 628, 0, 629, 0, 630, 0, 631, 0, 632, 0, 633, 0, 634, 0, 635, 0, 636, 0, 637, 0, 638, 0, 639, 0, 768, 0, 769, 0, 770, 0, 771, 0, 772, 0, 773, 0, 774, 0, 775, 0, 776, 0, 777, 0, 778, 0, 779, 0, 780, 0, 781, 0, 782, 0, 783, 0, 784, 0, 785, 0, 786, 0, 787, 0, 788, 0, 789, 0, 790, 0, 791, 0, 792, 0, 793, 0, 794, 0, 795, 0, 796, 0, 797, 0, 798, 0, 799, 0, 800, 0, 801, 0, 802, 0, 803, 0, 804, 0,-- More --My size_x and size_y variables are set to 128 x 128. The output is clearly outside of this range for some pixels. Any ideas? Thanks for any time and help that you can provide.
