82 lines
No EOL
3.3 KiB
Text
82 lines
No EOL
3.3 KiB
Text
#version 450
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layout(binding = 0) uniform UniformBufferObject {
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mat4 model;
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mat4 geom_rot;
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mat4 view;
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mat4 proj;
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vec3 camera_pos;
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bool[16] use_geom_shader;
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} ubo;
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layout(binding = 3) readonly buffer CompoundBuffer {
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uint compounds[];
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};
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layout(binding = 4) readonly buffer ColorBuffer {
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uint grid_in[];
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};
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layout(binding = 9) readonly buffer TransparentBuffer {
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bool transparent_grid[];
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};
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layout(binding = 8) buffer SizeBuffer3D {
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uint grid_out[];
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};
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layout (local_size_x = 16, local_size_y = 1, local_size_z = 1) in;
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void main() {
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uint index = gl_GlobalInvocationID.x;
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uint output_offset = 0;
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uint compound_start = 0;
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// iterate over the compounds and find the work index inside of it
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while (index > compounds[compound_start] * compounds[compound_start]) {
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output_offset += compounds[compound_start] * compounds[compound_start] * compounds[compound_start];
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index -= compounds[compound_start] * compounds[compound_start];
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compound_start = compounds[compound_start + 2];
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}
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// grid pos in the task
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uint compound_grid_size = compounds[compound_start];
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float compound_scale = uintBitsToFloat(compounds[compound_start + 1]);
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vec3 mid_offset = vec3(compound_scale * 0.5, compound_scale * 0.5, compound_scale * 0.5);
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uint y = index % compound_grid_size;
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uint z = (index - y) / compound_grid_size;
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vec3 compound_pos = vec3(uintBitsToFloat(compounds[compound_start + 5]), uintBitsToFloat(compounds[compound_start + 6]), uintBitsToFloat(compounds[compound_start + 7]));
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// iterate upwards along the x axis
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bool seen_empty = false;
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uint start = 0;
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uint last_col = 0;
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for (uint x=0; x < compound_grid_size; x++) {
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uint color_val = grid_in[output_offset + x * compound_grid_size * compound_grid_size + y * compound_grid_size + z];
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bool transparent = transparent_grid[output_offset + x * compound_grid_size * compound_grid_size + y * compound_grid_size + z];
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grid_out[output_offset + x * compound_grid_size * compound_grid_size + y * compound_grid_size + z] = 0;
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// check if we need to stop a volume
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if (color_val != 0 && !transparent) {
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// check if we are in a volume right now
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if (seen_empty) {
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// close the current volume
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grid_out[output_offset + start * compound_grid_size * compound_grid_size + y * compound_grid_size + z] = x - start;
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seen_empty = false;
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last_col = 0;
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}
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} else {
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// check if transparency changed
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if (seen_empty && transparent && last_col != color_val) {
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// if we switch colors close the current volume and prepare for a new one
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grid_out[output_offset + start * compound_grid_size * compound_grid_size + y * compound_grid_size + z] = x - start;
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seen_empty = false;
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}
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// start a new volume if we are not in one right now
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if (!seen_empty) {
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seen_empty = true;
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start = x;
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last_col = color_val;
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}
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}
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}
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if (seen_empty) {
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grid_out[output_offset + start * compound_grid_size * compound_grid_size + y * compound_grid_size + z] = compound_grid_size - start;
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}
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} |