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/* To be compiled with common_subdiv_lib.glsl */
layout(std430, binding = 1) readonly buffer inputEdgeOrigIndex
{
int input_origindex[];
};
layout(std430, binding = 2) readonly restrict buffer extraCoarseFaceData
{
uint extra_coarse_face_data[];
};
layout(std430, binding = 3) writeonly buffer outputLinesIndices
{
uint output_lines[];
};
layout(std430, binding = 4) readonly buffer LinesLooseFlags
{
uint lines_loose_flags[];
};
#ifndef LINES_LOOSE
bool is_face_hidden(uint coarse_quad_index)
{
return (extra_coarse_face_data[coarse_quad_index] & coarse_face_hidden_mask) != 0;
}
void emit_line(uint line_offset, uint quad_index, uint start_loop_index, uint corner_index)
{
uint vertex_index = start_loop_index + corner_index;
uint coarse_quad_index = coarse_polygon_index_from_subdiv_quad_index(quad_index,
coarse_poly_count);
if (is_face_hidden(coarse_quad_index) ||
(input_origindex[vertex_index] == ORIGINDEX_NONE && optimal_display)) {
output_lines[line_offset + 0] = 0xffffffff;
output_lines[line_offset + 1] = 0xffffffff;
}
else {
/* Mod 4 so we loop back at the first vertex on the last loop index (3). */
uint next_vertex_index = start_loop_index + (corner_index + 1) % 4;
output_lines[line_offset + 0] = vertex_index;
output_lines[line_offset + 1] = next_vertex_index;
}
}
#endif
void main()
{
uint index = get_global_invocation_index();
if (index >= total_dispatch_size) {
return;
}
#ifdef LINES_LOOSE
/* In the loose lines case, we execute for each line, with two vertices per line. */
uint line_offset = edge_loose_offset + index * 2;
uint loop_index = num_subdiv_loops + index * 2;
if (lines_loose_flags[index] != 0) {
/* Line is hidden. */
output_lines[line_offset] = 0xffffffff;
output_lines[line_offset + 1] = 0xffffffff;
}
else {
output_lines[line_offset] = loop_index;
output_lines[line_offset + 1] = loop_index + 1;
}
#else
/* We execute for each quad, so the start index of the loop is quad_index * 4. */
uint start_loop_index = index * 4;
/* We execute for each quad, so the start index of the line is quad_index * 8 (with 2 vertices
* per line). */
uint start_line_index = index * 8;
for (int i = 0; i < 4; i++) {
emit_line(start_line_index + i * 2, index, start_loop_index, i);
}
#endif
}
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