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voxelpainter.cu
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#include <cooperative_groups.h>
#include <curand_kernel.h>
#include "utils.h.cu"
#include "builtin_types.h"
#include "helper_math.h"
#include "HostDeviceInterface.h"
constexpr bool EDL_ENABLED = false;
constexpr uint32_t gridSize = 128;
constexpr float fGridSize = gridSize;
constexpr uint32_t numCells = gridSize * gridSize * gridSize;
constexpr float3 gridMin = { -1.0f, -1.0f, 0.0f};
constexpr float3 gridMax = { 1.0f, 1.0f, 2.0f};
float cross(float2 a, float2 b){
return a.x * b.y - a.y * b.x;
}
// table from http://paulbourke.net/geometry/polygonise/marchingsource.cpp
// (publich domain)
constexpr int edgeTable[256] = {
0x000, 0x109, 0x203, 0x30a, 0x406, 0x50f, 0x605, 0x70c, 0x80c, 0x905, 0xa0f, 0xb06, 0xc0a, 0xd03, 0xe09, 0xf00,
0x190, 0x099, 0x393, 0x29a, 0x596, 0x49f, 0x795, 0x69c, 0x99c, 0x895, 0xb9f, 0xa96, 0xd9a, 0xc93, 0xf99, 0xe90,
0x230, 0x339, 0x033, 0x13a, 0x636, 0x73f, 0x435, 0x53c, 0xa3c, 0xb35, 0x83f, 0x936, 0xe3a, 0xf33, 0xc39, 0xd30,
0x3a0, 0x2a9, 0x1a3, 0x0aa, 0x7a6, 0x6af, 0x5a5, 0x4ac, 0xbac, 0xaa5, 0x9af, 0x8a6, 0xfaa, 0xea3, 0xda9, 0xca0,
0x460, 0x569, 0x663, 0x76a, 0x066, 0x16f, 0x265, 0x36c, 0xc6c, 0xd65, 0xe6f, 0xf66, 0x86a, 0x963, 0xa69, 0xb60,
0x5f0, 0x4f9, 0x7f3, 0x6fa, 0x1f6, 0x0ff, 0x3f5, 0x2fc, 0xdfc, 0xcf5, 0xfff, 0xef6, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
0x650, 0x759, 0x453, 0x55a, 0x256, 0x35f, 0x055, 0x15c, 0xe5c, 0xf55, 0xc5f, 0xd56, 0xa5a, 0xb53, 0x859, 0x950,
0x7c0, 0x6c9, 0x5c3, 0x4ca, 0x3c6, 0x2cf, 0x1c5, 0x0cc, 0xfcc, 0xec5, 0xdcf, 0xcc6, 0xbca, 0xac3, 0x9c9, 0x8c0,
0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc6, 0xdcf, 0xec5, 0xfcc, 0x0cc, 0x1c5, 0x2cf, 0x3c6, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
0x950, 0x859, 0xb53, 0xa5a, 0xd56, 0xc5f, 0xf55, 0xe5c, 0x15c, 0x055, 0x35f, 0x256, 0x55a, 0x453, 0x759, 0x650,
0xaf0, 0xbf9, 0x8f3, 0x9fa, 0xef6, 0xfff, 0xcf5, 0xdfc, 0x2fc, 0x3f5, 0x0ff, 0x1f6, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
0xb60, 0xa69, 0x963, 0x86a, 0xf66, 0xe6f, 0xd65, 0xc6c, 0x36c, 0x265, 0x16f, 0x066, 0x76a, 0x663, 0x569, 0x460,
0xca0, 0xda9, 0xea3, 0xfaa, 0x8a6, 0x9af, 0xaa5, 0xbac, 0x4ac, 0x5a5, 0x6af, 0x7a6, 0x0aa, 0x1a3, 0x2a9, 0x3a0,
0xd30, 0xc39, 0xf33, 0xe3a, 0x936, 0x83f, 0xb35, 0xa3c, 0x53c, 0x435, 0x73f, 0x636, 0x13a, 0x033, 0x339, 0x230,
0xe90, 0xf99, 0xc93, 0xd9a, 0xa96, 0xb9f, 0x895, 0x99c, 0x69c, 0x795, 0x49f, 0x596, 0x29a, 0x393, 0x099, 0x190,
0xf00, 0xe09, 0xd03, 0xc0a, 0xb06, 0xa0f, 0x905, 0x80c, 0x70c, 0x605, 0x50f, 0x406, 0x30a, 0x203, 0x109, 0x000
};
// table from http://paulbourke.net/geometry/polygonise/marchingsource.cpp
// (publich domain)
constexpr int triTable[256][16] =
{
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 1, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 8, 3, 9, 8, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 3, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{9, 2, 10, 0, 2, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{2, 8, 3, 2, 10, 8, 10, 9, 8, -1, -1, -1, -1, -1, -1, -1},
{3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 11, 2, 8, 11, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 9, 0, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 11, 2, 1, 9, 11, 9, 8, 11, -1, -1, -1, -1, -1, -1, -1},
{3, 10, 1, 11, 10, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 10, 1, 0, 8, 10, 8, 11, 10, -1, -1, -1, -1, -1, -1, -1},
{3, 9, 0, 3, 11, 9, 11, 10, 9, -1, -1, -1, -1, -1, -1, -1},
{9, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 3, 0, 7, 3, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 1, 9, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 1, 9, 4, 7, 1, 7, 3, 1, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 10, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{3, 4, 7, 3, 0, 4, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1},
{9, 2, 10, 9, 0, 2, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1},
{2, 10, 9, 2, 9, 7, 2, 7, 3, 7, 9, 4, -1, -1, -1, -1},
{8, 4, 7, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{11, 4, 7, 11, 2, 4, 2, 0, 4, -1, -1, -1, -1, -1, -1, -1},
{9, 0, 1, 8, 4, 7, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1},
{4, 7, 11, 9, 4, 11, 9, 11, 2, 9, 2, 1, -1, -1, -1, -1},
{3, 10, 1, 3, 11, 10, 7, 8, 4, -1, -1, -1, -1, -1, -1, -1},
{1, 11, 10, 1, 4, 11, 1, 0, 4, 7, 11, 4, -1, -1, -1, -1},
{4, 7, 8, 9, 0, 11, 9, 11, 10, 11, 0, 3, -1, -1, -1, -1},
{4, 7, 11, 4, 11, 9, 9, 11, 10, -1, -1, -1, -1, -1, -1, -1},
{9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{9, 5, 4, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 5, 4, 1, 5, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{8, 5, 4, 8, 3, 5, 3, 1, 5, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 10, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{3, 0, 8, 1, 2, 10, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1},
{5, 2, 10, 5, 4, 2, 4, 0, 2, -1, -1, -1, -1, -1, -1, -1},
{2, 10, 5, 3, 2, 5, 3, 5, 4, 3, 4, 8, -1, -1, -1, -1},
{9, 5, 4, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 11, 2, 0, 8, 11, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1},
{0, 5, 4, 0, 1, 5, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1},
{2, 1, 5, 2, 5, 8, 2, 8, 11, 4, 8, 5, -1, -1, -1, -1},
{10, 3, 11, 10, 1, 3, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1},
{4, 9, 5, 0, 8, 1, 8, 10, 1, 8, 11, 10, -1, -1, -1, -1},
{5, 4, 0, 5, 0, 11, 5, 11, 10, 11, 0, 3, -1, -1, -1, -1},
{5, 4, 8, 5, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1},
{9, 7, 8, 5, 7, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{9, 3, 0, 9, 5, 3, 5, 7, 3, -1, -1, -1, -1, -1, -1, -1},
{0, 7, 8, 0, 1, 7, 1, 5, 7, -1, -1, -1, -1, -1, -1, -1},
{1, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{9, 7, 8, 9, 5, 7, 10, 1, 2, -1, -1, -1, -1, -1, -1, -1},
{10, 1, 2, 9, 5, 0, 5, 3, 0, 5, 7, 3, -1, -1, -1, -1},
{8, 0, 2, 8, 2, 5, 8, 5, 7, 10, 5, 2, -1, -1, -1, -1},
{2, 10, 5, 2, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1},
{7, 9, 5, 7, 8, 9, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1},
{9, 5, 7, 9, 7, 2, 9, 2, 0, 2, 7, 11, -1, -1, -1, -1},
{2, 3, 11, 0, 1, 8, 1, 7, 8, 1, 5, 7, -1, -1, -1, -1},
{11, 2, 1, 11, 1, 7, 7, 1, 5, -1, -1, -1, -1, -1, -1, -1},
{9, 5, 8, 8, 5, 7, 10, 1, 3, 10, 3, 11, -1, -1, -1, -1},
{5, 7, 0, 5, 0, 9, 7, 11, 0, 1, 0, 10, 11, 10, 0, -1},
{11, 10, 0, 11, 0, 3, 10, 5, 0, 8, 0, 7, 5, 7, 0, -1},
{11, 10, 5, 7, 11, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 3, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{9, 0, 1, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 8, 3, 1, 9, 8, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1},
{1, 6, 5, 2, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 6, 5, 1, 2, 6, 3, 0, 8, -1, -1, -1, -1, -1, -1, -1},
{9, 6, 5, 9, 0, 6, 0, 2, 6, -1, -1, -1, -1, -1, -1, -1},
{5, 9, 8, 5, 8, 2, 5, 2, 6, 3, 2, 8, -1, -1, -1, -1},
{2, 3, 11, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{11, 0, 8, 11, 2, 0, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1},
{0, 1, 9, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1},
{5, 10, 6, 1, 9, 2, 9, 11, 2, 9, 8, 11, -1, -1, -1, -1},
{6, 3, 11, 6, 5, 3, 5, 1, 3, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 11, 0, 11, 5, 0, 5, 1, 5, 11, 6, -1, -1, -1, -1},
{3, 11, 6, 0, 3, 6, 0, 6, 5, 0, 5, 9, -1, -1, -1, -1},
{6, 5, 9, 6, 9, 11, 11, 9, 8, -1, -1, -1, -1, -1, -1, -1},
{5, 10, 6, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 3, 0, 4, 7, 3, 6, 5, 10, -1, -1, -1, -1, -1, -1, -1},
{1, 9, 0, 5, 10, 6, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1},
{10, 6, 5, 1, 9, 7, 1, 7, 3, 7, 9, 4, -1, -1, -1, -1},
{6, 1, 2, 6, 5, 1, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 5, 5, 2, 6, 3, 0, 4, 3, 4, 7, -1, -1, -1, -1},
{8, 4, 7, 9, 0, 5, 0, 6, 5, 0, 2, 6, -1, -1, -1, -1},
{7, 3, 9, 7, 9, 4, 3, 2, 9, 5, 9, 6, 2, 6, 9, -1},
{3, 11, 2, 7, 8, 4, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1},
{5, 10, 6, 4, 7, 2, 4, 2, 0, 2, 7, 11, -1, -1, -1, -1},
{0, 1, 9, 4, 7, 8, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1},
{9, 2, 1, 9, 11, 2, 9, 4, 11, 7, 11, 4, 5, 10, 6, -1},
{8, 4, 7, 3, 11, 5, 3, 5, 1, 5, 11, 6, -1, -1, -1, -1},
{5, 1, 11, 5, 11, 6, 1, 0, 11, 7, 11, 4, 0, 4, 11, -1},
{0, 5, 9, 0, 6, 5, 0, 3, 6, 11, 6, 3, 8, 4, 7, -1},
{6, 5, 9, 6, 9, 11, 4, 7, 9, 7, 11, 9, -1, -1, -1, -1},
{10, 4, 9, 6, 4, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 10, 6, 4, 9, 10, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1},
{10, 0, 1, 10, 6, 0, 6, 4, 0, -1, -1, -1, -1, -1, -1, -1},
{8, 3, 1, 8, 1, 6, 8, 6, 4, 6, 1, 10, -1, -1, -1, -1},
{1, 4, 9, 1, 2, 4, 2, 6, 4, -1, -1, -1, -1, -1, -1, -1},
{3, 0, 8, 1, 2, 9, 2, 4, 9, 2, 6, 4, -1, -1, -1, -1},
{0, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{8, 3, 2, 8, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1},
{10, 4, 9, 10, 6, 4, 11, 2, 3, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 2, 2, 8, 11, 4, 9, 10, 4, 10, 6, -1, -1, -1, -1},
{3, 11, 2, 0, 1, 6, 0, 6, 4, 6, 1, 10, -1, -1, -1, -1},
{6, 4, 1, 6, 1, 10, 4, 8, 1, 2, 1, 11, 8, 11, 1, -1},
{9, 6, 4, 9, 3, 6, 9, 1, 3, 11, 6, 3, -1, -1, -1, -1},
{8, 11, 1, 8, 1, 0, 11, 6, 1, 9, 1, 4, 6, 4, 1, -1},
{3, 11, 6, 3, 6, 0, 0, 6, 4, -1, -1, -1, -1, -1, -1, -1},
{6, 4, 8, 11, 6, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{7, 10, 6, 7, 8, 10, 8, 9, 10, -1, -1, -1, -1, -1, -1, -1},
{0, 7, 3, 0, 10, 7, 0, 9, 10, 6, 7, 10, -1, -1, -1, -1},
{10, 6, 7, 1, 10, 7, 1, 7, 8, 1, 8, 0, -1, -1, -1, -1},
{10, 6, 7, 10, 7, 1, 1, 7, 3, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 6, 1, 6, 8, 1, 8, 9, 8, 6, 7, -1, -1, -1, -1},
{2, 6, 9, 2, 9, 1, 6, 7, 9, 0, 9, 3, 7, 3, 9, -1},
{7, 8, 0, 7, 0, 6, 6, 0, 2, -1, -1, -1, -1, -1, -1, -1},
{7, 3, 2, 6, 7, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{2, 3, 11, 10, 6, 8, 10, 8, 9, 8, 6, 7, -1, -1, -1, -1},
{2, 0, 7, 2, 7, 11, 0, 9, 7, 6, 7, 10, 9, 10, 7, -1},
{1, 8, 0, 1, 7, 8, 1, 10, 7, 6, 7, 10, 2, 3, 11, -1},
{11, 2, 1, 11, 1, 7, 10, 6, 1, 6, 7, 1, -1, -1, -1, -1},
{8, 9, 6, 8, 6, 7, 9, 1, 6, 11, 6, 3, 1, 3, 6, -1},
{0, 9, 1, 11, 6, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{7, 8, 0, 7, 0, 6, 3, 11, 0, 11, 6, 0, -1, -1, -1, -1},
{7, 11, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{3, 0, 8, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 1, 9, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{8, 1, 9, 8, 3, 1, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1},
{10, 1, 2, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 10, 3, 0, 8, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1},
{2, 9, 0, 2, 10, 9, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1},
{6, 11, 7, 2, 10, 3, 10, 8, 3, 10, 9, 8, -1, -1, -1, -1},
{7, 2, 3, 6, 2, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{7, 0, 8, 7, 6, 0, 6, 2, 0, -1, -1, -1, -1, -1, -1, -1},
{2, 7, 6, 2, 3, 7, 0, 1, 9, -1, -1, -1, -1, -1, -1, -1},
{1, 6, 2, 1, 8, 6, 1, 9, 8, 8, 7, 6, -1, -1, -1, -1},
{10, 7, 6, 10, 1, 7, 1, 3, 7, -1, -1, -1, -1, -1, -1, -1},
{10, 7, 6, 1, 7, 10, 1, 8, 7, 1, 0, 8, -1, -1, -1, -1},
{0, 3, 7, 0, 7, 10, 0, 10, 9, 6, 10, 7, -1, -1, -1, -1},
{7, 6, 10, 7, 10, 8, 8, 10, 9, -1, -1, -1, -1, -1, -1, -1},
{6, 8, 4, 11, 8, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{3, 6, 11, 3, 0, 6, 0, 4, 6, -1, -1, -1, -1, -1, -1, -1},
{8, 6, 11, 8, 4, 6, 9, 0, 1, -1, -1, -1, -1, -1, -1, -1},
{9, 4, 6, 9, 6, 3, 9, 3, 1, 11, 3, 6, -1, -1, -1, -1},
{6, 8, 4, 6, 11, 8, 2, 10, 1, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 10, 3, 0, 11, 0, 6, 11, 0, 4, 6, -1, -1, -1, -1},
{4, 11, 8, 4, 6, 11, 0, 2, 9, 2, 10, 9, -1, -1, -1, -1},
{10, 9, 3, 10, 3, 2, 9, 4, 3, 11, 3, 6, 4, 6, 3, -1},
{8, 2, 3, 8, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1},
{0, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 9, 0, 2, 3, 4, 2, 4, 6, 4, 3, 8, -1, -1, -1, -1},
{1, 9, 4, 1, 4, 2, 2, 4, 6, -1, -1, -1, -1, -1, -1, -1},
{8, 1, 3, 8, 6, 1, 8, 4, 6, 6, 10, 1, -1, -1, -1, -1},
{10, 1, 0, 10, 0, 6, 6, 0, 4, -1, -1, -1, -1, -1, -1, -1},
{4, 6, 3, 4, 3, 8, 6, 10, 3, 0, 3, 9, 10, 9, 3, -1},
{10, 9, 4, 6, 10, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 9, 5, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 3, 4, 9, 5, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1},
{5, 0, 1, 5, 4, 0, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1},
{11, 7, 6, 8, 3, 4, 3, 5, 4, 3, 1, 5, -1, -1, -1, -1},
{9, 5, 4, 10, 1, 2, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1},
{6, 11, 7, 1, 2, 10, 0, 8, 3, 4, 9, 5, -1, -1, -1, -1},
{7, 6, 11, 5, 4, 10, 4, 2, 10, 4, 0, 2, -1, -1, -1, -1},
{3, 4, 8, 3, 5, 4, 3, 2, 5, 10, 5, 2, 11, 7, 6, -1},
{7, 2, 3, 7, 6, 2, 5, 4, 9, -1, -1, -1, -1, -1, -1, -1},
{9, 5, 4, 0, 8, 6, 0, 6, 2, 6, 8, 7, -1, -1, -1, -1},
{3, 6, 2, 3, 7, 6, 1, 5, 0, 5, 4, 0, -1, -1, -1, -1},
{6, 2, 8, 6, 8, 7, 2, 1, 8, 4, 8, 5, 1, 5, 8, -1},
{9, 5, 4, 10, 1, 6, 1, 7, 6, 1, 3, 7, -1, -1, -1, -1},
{1, 6, 10, 1, 7, 6, 1, 0, 7, 8, 7, 0, 9, 5, 4, -1},
{4, 0, 10, 4, 10, 5, 0, 3, 10, 6, 10, 7, 3, 7, 10, -1},
{7, 6, 10, 7, 10, 8, 5, 4, 10, 4, 8, 10, -1, -1, -1, -1},
{6, 9, 5, 6, 11, 9, 11, 8, 9, -1, -1, -1, -1, -1, -1, -1},
{3, 6, 11, 0, 6, 3, 0, 5, 6, 0, 9, 5, -1, -1, -1, -1},
{0, 11, 8, 0, 5, 11, 0, 1, 5, 5, 6, 11, -1, -1, -1, -1},
{6, 11, 3, 6, 3, 5, 5, 3, 1, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 10, 9, 5, 11, 9, 11, 8, 11, 5, 6, -1, -1, -1, -1},
{0, 11, 3, 0, 6, 11, 0, 9, 6, 5, 6, 9, 1, 2, 10, -1},
{11, 8, 5, 11, 5, 6, 8, 0, 5, 10, 5, 2, 0, 2, 5, -1},
{6, 11, 3, 6, 3, 5, 2, 10, 3, 10, 5, 3, -1, -1, -1, -1},
{5, 8, 9, 5, 2, 8, 5, 6, 2, 3, 8, 2, -1, -1, -1, -1},
{9, 5, 6, 9, 6, 0, 0, 6, 2, -1, -1, -1, -1, -1, -1, -1},
{1, 5, 8, 1, 8, 0, 5, 6, 8, 3, 8, 2, 6, 2, 8, -1},
{1, 5, 6, 2, 1, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 3, 6, 1, 6, 10, 3, 8, 6, 5, 6, 9, 8, 9, 6, -1},
{10, 1, 0, 10, 0, 6, 9, 5, 0, 5, 6, 0, -1, -1, -1, -1},
{0, 3, 8, 5, 6, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{10, 5, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{11, 5, 10, 7, 5, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{11, 5, 10, 11, 7, 5, 8, 3, 0, -1, -1, -1, -1, -1, -1, -1},
{5, 11, 7, 5, 10, 11, 1, 9, 0, -1, -1, -1, -1, -1, -1, -1},
{10, 7, 5, 10, 11, 7, 9, 8, 1, 8, 3, 1, -1, -1, -1, -1},
{11, 1, 2, 11, 7, 1, 7, 5, 1, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 3, 1, 2, 7, 1, 7, 5, 7, 2, 11, -1, -1, -1, -1},
{9, 7, 5, 9, 2, 7, 9, 0, 2, 2, 11, 7, -1, -1, -1, -1},
{7, 5, 2, 7, 2, 11, 5, 9, 2, 3, 2, 8, 9, 8, 2, -1},
{2, 5, 10, 2, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1},
{8, 2, 0, 8, 5, 2, 8, 7, 5, 10, 2, 5, -1, -1, -1, -1},
{9, 0, 1, 5, 10, 3, 5, 3, 7, 3, 10, 2, -1, -1, -1, -1},
{9, 8, 2, 9, 2, 1, 8, 7, 2, 10, 2, 5, 7, 5, 2, -1},
{1, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 7, 0, 7, 1, 1, 7, 5, -1, -1, -1, -1, -1, -1, -1},
{9, 0, 3, 9, 3, 5, 5, 3, 7, -1, -1, -1, -1, -1, -1, -1},
{9, 8, 7, 5, 9, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{5, 8, 4, 5, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1},
{5, 0, 4, 5, 11, 0, 5, 10, 11, 11, 3, 0, -1, -1, -1, -1},
{0, 1, 9, 8, 4, 10, 8, 10, 11, 10, 4, 5, -1, -1, -1, -1},
{10, 11, 4, 10, 4, 5, 11, 3, 4, 9, 4, 1, 3, 1, 4, -1},
{2, 5, 1, 2, 8, 5, 2, 11, 8, 4, 5, 8, -1, -1, -1, -1},
{0, 4, 11, 0, 11, 3, 4, 5, 11, 2, 11, 1, 5, 1, 11, -1},
{0, 2, 5, 0, 5, 9, 2, 11, 5, 4, 5, 8, 11, 8, 5, -1},
{9, 4, 5, 2, 11, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{2, 5, 10, 3, 5, 2, 3, 4, 5, 3, 8, 4, -1, -1, -1, -1},
{5, 10, 2, 5, 2, 4, 4, 2, 0, -1, -1, -1, -1, -1, -1, -1},
{3, 10, 2, 3, 5, 10, 3, 8, 5, 4, 5, 8, 0, 1, 9, -1},
{5, 10, 2, 5, 2, 4, 1, 9, 2, 9, 4, 2, -1, -1, -1, -1},
{8, 4, 5, 8, 5, 3, 3, 5, 1, -1, -1, -1, -1, -1, -1, -1},
{0, 4, 5, 1, 0, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{8, 4, 5, 8, 5, 3, 9, 0, 5, 0, 3, 5, -1, -1, -1, -1},
{9, 4, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 11, 7, 4, 9, 11, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1},
{0, 8, 3, 4, 9, 7, 9, 11, 7, 9, 10, 11, -1, -1, -1, -1},
{1, 10, 11, 1, 11, 4, 1, 4, 0, 7, 4, 11, -1, -1, -1, -1},
{3, 1, 4, 3, 4, 8, 1, 10, 4, 7, 4, 11, 10, 11, 4, -1},
{4, 11, 7, 9, 11, 4, 9, 2, 11, 9, 1, 2, -1, -1, -1, -1},
{9, 7, 4, 9, 11, 7, 9, 1, 11, 2, 11, 1, 0, 8, 3, -1},
{11, 7, 4, 11, 4, 2, 2, 4, 0, -1, -1, -1, -1, -1, -1, -1},
{11, 7, 4, 11, 4, 2, 8, 3, 4, 3, 2, 4, -1, -1, -1, -1},
{2, 9, 10, 2, 7, 9, 2, 3, 7, 7, 4, 9, -1, -1, -1, -1},
{9, 10, 7, 9, 7, 4, 10, 2, 7, 8, 7, 0, 2, 0, 7, -1},
{3, 7, 10, 3, 10, 2, 7, 4, 10, 1, 10, 0, 4, 0, 10, -1},
{1, 10, 2, 8, 7, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 9, 1, 4, 1, 7, 7, 1, 3, -1, -1, -1, -1, -1, -1, -1},
{4, 9, 1, 4, 1, 7, 0, 8, 1, 8, 7, 1, -1, -1, -1, -1},
{4, 0, 3, 7, 4, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{4, 8, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{9, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{3, 0, 9, 3, 9, 11, 11, 9, 10, -1, -1, -1, -1, -1, -1, -1},
{0, 1, 10, 0, 10, 8, 8, 10, 11, -1, -1, -1, -1, -1, -1, -1},
{3, 1, 10, 11, 3, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 2, 11, 1, 11, 9, 9, 11, 8, -1, -1, -1, -1, -1, -1, -1},
{3, 0, 9, 3, 9, 11, 1, 2, 9, 2, 11, 9, -1, -1, -1, -1},
{0, 2, 11, 8, 0, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{3, 2, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{2, 3, 8, 2, 8, 10, 10, 8, 9, -1, -1, -1, -1, -1, -1, -1},
{9, 10, 2, 0, 9, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{2, 3, 8, 2, 8, 10, 0, 1, 8, 1, 10, 8, -1, -1, -1, -1},
{1, 10, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{1, 3, 8, 9, 1, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 9, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{0, 3, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}
};
struct RenderTarget{
mat4 view;
mat4 proj;
mat4 transform;
uint64_t* framebuffer;
float width;
float height;
};
float4 operator*(const mat4& a, const float4& b){
return make_float4(
dot(a.rows[0], b),
dot(a.rows[1], b),
dot(a.rows[2], b),
dot(a.rows[3], b)
);
}
mat4 operator*(const mat4& a, const mat4& b){
mat4 result;
result.rows[0].x = dot(a.rows[0], {b.rows[0].x, b.rows[1].x, b.rows[2].x, b.rows[3].x});
result.rows[0].y = dot(a.rows[0], {b.rows[0].y, b.rows[1].y, b.rows[2].y, b.rows[3].y});
result.rows[0].z = dot(a.rows[0], {b.rows[0].z, b.rows[1].z, b.rows[2].z, b.rows[3].z});
result.rows[0].w = dot(a.rows[0], {b.rows[0].w, b.rows[1].w, b.rows[2].w, b.rows[3].w});
result.rows[1].x = dot(a.rows[1], {b.rows[0].x, b.rows[1].x, b.rows[2].x, b.rows[3].x});
result.rows[1].y = dot(a.rows[1], {b.rows[0].y, b.rows[1].y, b.rows[2].y, b.rows[3].y});
result.rows[1].z = dot(a.rows[1], {b.rows[0].z, b.rows[1].z, b.rows[2].z, b.rows[3].z});
result.rows[1].w = dot(a.rows[1], {b.rows[0].w, b.rows[1].w, b.rows[2].w, b.rows[3].w});
result.rows[2].x = dot(a.rows[2], {b.rows[0].x, b.rows[1].x, b.rows[2].x, b.rows[3].x});
result.rows[2].y = dot(a.rows[2], {b.rows[0].y, b.rows[1].y, b.rows[2].y, b.rows[3].y});
result.rows[2].z = dot(a.rows[2], {b.rows[0].z, b.rows[1].z, b.rows[2].z, b.rows[3].z});
result.rows[2].w = dot(a.rows[2], {b.rows[0].w, b.rows[1].w, b.rows[2].w, b.rows[3].w});
result.rows[3].x = dot(a.rows[3], {b.rows[0].x, b.rows[1].x, b.rows[2].x, b.rows[3].x});
result.rows[3].y = dot(a.rows[3], {b.rows[0].y, b.rows[1].y, b.rows[2].y, b.rows[3].y});
result.rows[3].z = dot(a.rows[3], {b.rows[0].z, b.rows[1].z, b.rows[2].z, b.rows[3].z});
result.rows[3].w = dot(a.rows[3], {b.rows[0].w, b.rows[1].w, b.rows[2].w, b.rows[3].w});
return result;
}
struct Intersection{
float3 position;
float distance;
bool intersects(){
return distance > 0.0f && distance != Infinity;
}
};
Intersection rayPlane(float3 origin, float3 direction, float3 planeNormal, float planeDistance){
float denominator = dot(planeNormal, direction);
if(denominator == 0){
Intersection I;
I.distance = Infinity;
return I;
}else{
float distance = - (dot(origin, planeNormal) + planeDistance ) / denominator;
Intersection I;
I.distance = distance;
I.position = origin + direction * distance;
return I;
}
}
namespace cg = cooperative_groups;
Uniforms uniforms;
Allocator* allocator;
uint64_t nanotime_start;
constexpr float PI = 3.1415;
constexpr uint32_t BACKGROUND_COLOR = 0x00332211ull;
struct Triangles{
int numTriangles;
float3* positions;
float2* uvs;
uint32_t* colors;
};
struct Texture{
int width;
int height;
uint32_t* data;
};
struct RasterizationSettings{
Texture* texture = nullptr;
int colorMode = COLORMODE_TRIANGLE_ID;
mat4 world;
mat4 view;
mat4 proj;
mat4 transform;
float width;
float height;
};
uint32_t sample_nearest(float2 uv, Texture* texture){
int tx = int(uv.x * texture->width) % texture->width;
int ty = int(uv.y * texture->height) % texture->height;
ty = texture->height - ty;
int texelIndex = tx + texture->width * ty;
uint32_t texel = texture->data[texelIndex];
return texel;
}
uint32_t sample_linear(float2 uv, Texture* texture){
float width = texture->width;
float height = texture->height;
float tx = uv.x * width;
float ty = height - uv.y * height;
int x0 = clamp(floor(tx), 0.0f, width - 1.0f);
int x1 = clamp(ceil(tx) , 0.0f, width - 1.0f);
int y0 = clamp(floor(ty), 0.0f, height - 1.0f);
int y1 = clamp(ceil(ty) , 0.0f, height - 1.0f);
float wx = tx - floor(tx);
float wy = ty - floor(ty);
float w00 = (1.0 - wx) * (1.0 - wy);
float w10 = wx * (1.0 - wy);
float w01 = (1.0 - wx) * wy;
float w11 = wx * wy;
uint8_t* c00 = (uint8_t*)&texture->data[x0 + y0 * texture->width];
uint8_t* c10 = (uint8_t*)&texture->data[x1 + y0 * texture->width];
uint8_t* c01 = (uint8_t*)&texture->data[x0 + y1 * texture->width];
uint8_t* c11 = (uint8_t*)&texture->data[x1 + y1 * texture->width];
uint32_t color;
uint8_t* rgb = (uint8_t*)&color;
rgb[0] = c00[0] * w00 + c10[0] * w10 + c01[0] * w01 + c11[0] * w11;
rgb[1] = c00[1] * w00 + c10[1] * w10 + c01[1] * w01 + c11[1] * w11;
rgb[2] = c00[2] * w00 + c10[2] * w10 + c01[2] * w01 + c11[2] * w11;
return color;
}
// rasterizes triangles in a block-wise fashion
// - each block grabs a triangle
// - all threads of that block process different fragments of the triangle
// - <framebuffer> stores interleaved 32bit depth and color values
// - The closest fragments are rendered via atomicMin on a combined 64bit depth&color integer
// atomicMin(&framebuffer[pixelIndex], (depth << 32 | color));
// see http://www.sunshine2k.de/coding/java/TriangleRasterization/TriangleRasterization.html#algo3
void rasterizeTriangles(Triangles* triangles, uint64_t* framebuffer, RasterizationSettings settings){
auto grid = cg::this_grid();
auto block = cg::this_thread_block();
Texture* texture = settings.texture;
int colorMode = settings.colorMode;
mat4 transform = settings.proj * settings.view * settings.world;
uint32_t& processedTriangles = *allocator->alloc<uint32_t*>(4);
if(grid.thread_rank() == 0){
processedTriangles = 0;
}
grid.sync();
float3 lightPos = {10.0f, 10.0f, 10.0f};
// float3 L = {10.0f, 10.0f, 10.0f};
if(uniforms.vrEnabled){
float4 leftPos = uniforms.vr_left_view_inv * float4{0.0, 0.0f, 0.0f, 1.0f};
lightPos = {leftPos.x, leftPos.y, leftPos.z};
}
{
__shared__ int sh_triangleIndex;
block.sync();
// safety mechanism: each block draws at most <loop_max> triangles
int loop_max = 10'000;
for(int loop_i = 0; loop_i < loop_max; loop_i++){
// grab the index of the next unprocessed triangle
block.sync();
if(block.thread_rank() == 0){
sh_triangleIndex = atomicAdd(&processedTriangles, 1);
}
block.sync();
if(sh_triangleIndex >= triangles->numTriangles) break;
// project x/y to pixel coords
// z: whatever
// w: linear depth
auto toScreenCoord = [&](float3 p){
float4 pos = transform * float4{p.x, p.y, p.z, 1.0f};
pos.x = pos.x / pos.w;
pos.y = pos.y / pos.w;
// pos.z = pos.z / pos.w;
float4 imgPos = {
(pos.x * 0.5f + 0.5f) * settings.width,
(pos.y * 0.5f + 0.5f) * settings.height,
pos.z,
pos.w
};
return imgPos;
};
int i0 = 3 * sh_triangleIndex + 0;
int i1 = 3 * sh_triangleIndex + 1;
int i2 = 3 * sh_triangleIndex + 2;
float3 v0 = triangles->positions[i0];
float3 v1 = triangles->positions[i1];
float3 v2 = triangles->positions[i2];
float4 p0 = toScreenCoord(v0);
float4 p1 = toScreenCoord(v1);
float4 p2 = toScreenCoord(v2);
// cull a triangle if one of its vertices is closer than depth 0
if(p0.w < 0.0 || p1.w < 0.0 || p2.w < 0.0) continue;
float3 v01 = {v1.x - v0.x, v1.y - v0.y, v1.z - v0.z};
float3 v02 = {v2.x - v0.x, v2.y - v0.y, v2.z - v0.z};
float3 N = normalize(cross(v02, v01));
// if(sh_triangleIndex == 0 && block.thread_rank() == 0){
// printf("%f, %f, %f \n", N.x, N.y, N.z);
// }
float2 p01 = {p1.x - p0.x, p1.y - p0.y};
float2 p02 = {p2.x - p0.x, p2.y - p0.y};
// auto cross = [](float2 a, float2 b){ return a.x * b.y - a.y * b.x; };
// auto cross = [](float3 a, float3 b){ return a.y * b.z - a.y * b.x; };
{// backface culling
float w = cross(p01, p02);
if(w < 0.0) continue;
}
// compute screen-space bounding rectangle
float min_x = min(min(p0.x, p1.x), p2.x);
float min_y = min(min(p0.y, p1.y), p2.y);
float max_x = max(max(p0.x, p1.x), p2.x);
float max_y = max(max(p0.y, p1.y), p2.y);
// clamp to screen
min_x = clamp(min_x, 0.0f, settings.width);
min_y = clamp(min_y, 0.0f, settings.height);
max_x = clamp(max_x, 0.0f, settings.width);
max_y = clamp(max_y, 0.0f, settings.height);
int size_x = ceil(max_x) - floor(min_x);
int size_y = ceil(max_y) - floor(min_y);
int numFragments = size_x * size_y;
// iterate through fragments in bounding rectangle and draw if within triangle
int numProcessedSamples = 0;
for(int fragOffset = 0; fragOffset < numFragments; fragOffset += block.num_threads()){
// safety mechanism: don't draw more than <x> pixels per thread
if(numProcessedSamples > 5'000) break;
int fragID = fragOffset + block.thread_rank();
int fragX = fragID % size_x;
int fragY = fragID / size_x;
float2 pFrag = {
floor(min_x) + float(fragX),
floor(min_y) + float(fragY)
};
float2 sample = {pFrag.x - p0.x, pFrag.y - p0.y};
// v: vertex[0], s: vertex[1], t: vertex[2]
float s = cross(sample, p02) / cross(p01, p02);
float t = cross(p01, sample) / cross(p01, p02);
float v = 1.0 - (s + t);
int2 pixelCoords = make_int2(pFrag.x, pFrag.y);
int pixelID = pixelCoords.x + pixelCoords.y * settings.width;
pixelID = clamp(pixelID, 0, int(settings.width * settings.height) - 1);
if(s >= 0.0)
if(t >= 0.0)
if(s + t <= 1.0)
{
uint8_t* v0_rgba = (uint8_t*)&triangles->colors[i0];
uint8_t* v1_rgba = (uint8_t*)&triangles->colors[i1];
uint8_t* v2_rgba = (uint8_t*)&triangles->colors[i2];
float2 v0_uv = triangles->uvs[i0] / p0.z;
float2 v1_uv = triangles->uvs[i1] / p1.z;
float2 v2_uv = triangles->uvs[i2] / p2.z;
float2 uv = {
v * v0_uv.x + s * v1_uv.x + t * v2_uv.x,
v * v0_uv.y + s * v1_uv.y + t * v2_uv.y
};
float repz = v * (1.0f / p0.z) + s * (1.0f / p1.z) + t * (1.0f / p2.z);
uv.x = uv.x / repz;
uv.y = uv.y / repz;
uint32_t color;
uint8_t* rgb = (uint8_t*)&color;
// { // color by vertex color
// rgb[0] = v * v0_rgba[0] + s * v1_rgba[0] + t * v2_rgba[0];
// rgb[1] = v * v0_rgba[1] + s * v1_rgba[1] + t * v2_rgba[1];
// rgb[2] = v * v0_rgba[2] + s * v1_rgba[2] + t * v2_rgba[2];
// }
if(colorMode == COLORMODE_TEXTURE && texture != nullptr){
// TEXTURE
int tx = int(uv.x * texture->width) % texture->width;
int ty = int(uv.y * texture->height) % texture->height;
ty = texture->height - ty;
int texelIndex = tx + texture->width * ty;
uint32_t texel = texture->data[texelIndex];
uint8_t* texel_rgb = (uint8_t*)&texel;
if(uniforms.sampleMode == SAMPLEMODE_NEAREST){
color = sample_nearest(uv, texture);
}else if(uniforms.sampleMode == SAMPLEMODE_LINEAR){
color = sample_linear(uv, texture);
}
}else if(colorMode == COLORMODE_UV && triangles->uvs != nullptr){
// UV
rgb[0] = 255.0f * uv.x;
rgb[1] = 255.0f * uv.y;
rgb[2] = 0;
}else if(colorMode == COLORMODE_TRIANGLE_ID){
// TRIANGLE INDEX
color = sh_triangleIndex * 123456;
}else if(colorMode == COLORMODE_TIME || colorMode == COLORMODE_TIME_NORMALIZED){
// TIME
uint64_t nanotime;
asm volatile("mov.u64 %0, %%globaltimer;" : "=l"(nanotime));
color = (nanotime - nanotime_start) % 0x00ffffffull;
}else if(colorMode == COLORMODE_VERTEXCOLOR){
color = triangles->colors[i0];
}else{
// WHATEVER
color = sh_triangleIndex * 123456;
}
// float3 L = {10.0f, 10.0f, 10.0f};
float3 L = normalize(v0 - lightPos);
float lambertian = max(dot(N, L), 0.0);
// rgb[0] = 255.0f * N.x;
// rgb[1] = 255.0f * N.y;
// rgb[2] = 255.0f * N.z;
float3 diffuse = {0.8f, 0.8f, 0.8f};
float3 ambient = {0.2f, 0.2f, 0.2f};
rgb[0] = rgb[0] * (lambertian * diffuse.x + ambient.x);
rgb[1] = rgb[1] * (lambertian * diffuse.y + ambient.y);
rgb[2] = rgb[2] * (lambertian * diffuse.z + ambient.z);
float depth = v * p0.w + s * p1.w + t * p2.w;
uint64_t udepth = *((uint32_t*)&depth);
uint64_t pixel = (udepth << 32ull) | color;
atomicMin(&framebuffer[pixelID], pixel);
}
numProcessedSamples++;
}
}
}
}
void rasterizeVoxels(
int gridSize,
int numCells,
uint32_t* voxelGrid,
int numTargets,
RenderTarget* targets
){
float3 boxSize = gridMax - gridMin;
float voxelSize = boxSize.x / float(gridSize);
processRange(0, numCells, [&](int voxelIndex){
int vx = voxelIndex % gridSize;
int vy = voxelIndex % (gridSize * gridSize) / gridSize;
int vz = voxelIndex / (gridSize * gridSize);
uint32_t value = voxelGrid[voxelIndex];
if(value != 0){
float x = (float(vx) / fGridSize) * boxSize.x + gridMin.x;
float y = (float(vy) / fGridSize) * boxSize.y + gridMin.y;
float z = (float(vz) / fGridSize) * boxSize.z + gridMin.z;
for(int targetIndex = 0; targetIndex < numTargets; targetIndex++){
RenderTarget* target = &targets[targetIndex];
float4 pos = target->transform * float4{x, y, z, 1.0f};
float4 pos_off = target->view * float4{x, y, z, 1.0f};
pos_off.x += voxelSize;
pos_off = target->proj * pos_off;
float4 ndc = {
pos.x / pos.w,
pos.y / pos.w,
pos.z / pos.w,
pos.w
};
float4 ndc_off = {
pos_off.x / pos.w,
pos_off.y / pos.w,
pos_off.z / pos.w,
pos_off.w
};
float2 screenPos = {
(ndc.x * 0.5f + 0.5f) * target->width,
(ndc.y * 0.5f + 0.5f) * target->height,
};
float2 screenPos_off = {
(ndc_off.x * 0.5f + 0.5f) * target->width,
(ndc_off.y * 0.5f + 0.5f) * target->height,
};
float voxelSize_screen = abs(screenPos_off.x - screenPos.x);
voxelSize_screen = clamp(voxelSize_screen, 1.0f, 50.0f);
if(0.0f <= screenPos.x && screenPos.x < target->width)
if(0.0f <= screenPos.y && screenPos.y < target->height)
if(ndc.w > 0.0f){
int px = screenPos.x;
int py = screenPos.y;
int pixelID = px + py * target->width;
uint64_t color = 0x000000ff;
uint64_t idepth = *((uint32_t*)&pos.w);
// int spriteRadius = voxelSize_screen / 2.0f + 1.0f;
int spriteRadius = 4;
int spriteSize = 2 * spriteRadius + 1;
for(int ox = -spriteRadius; ox <= spriteRadius; ox++)
for(int oy = -spriteRadius; oy <= spriteRadius; oy++)
{
float u = float(ox) / spriteRadius;
float v = float(oy) / spriteRadius;
float dd = u * u + v * v;
if(dd > 1.0f) continue;
float d = sqrt(d);
uint32_t color;
uint8_t* rgba = (uint8_t*)&color;
rgba[0] = 255 * u;
rgba[1] = 255 * v;
rgba[2] = 0;
float w = dd;
rgba[0] = 255 - 200 * w;
rgba[1] = 255 - 200 * w;
rgba[2] = 255 - 200 * w;
rgba[3] = 0;
float fragdepth = pos.w + dd * voxelSize;
uint64_t idepth = *((uint32_t*)&fragdepth);
uint64_t pixel = (idepth << 32) | color;
if(!((0 <= px + ox) && (px + ox < target->width))) continue;
if(!((0 <= py + oy) && (py + oy < target->height))) continue;
atomicMin(&target->framebuffer[pixelID + ox + oy * int(target->width)], pixel);
}
}
}
}
});
}
// see
// * http://paulbourke.net/geometry/polygonise/
// * http://paulbourke.net/geometry/polygonise/marchingsource.cpp
// * https://developer.nvidia.com/gpugems/gpugems3/part-i-geometry/chapter-1-generating-complex-procedural-terrains-using-gpu
Triangles* marchingCubes(int gridSize, uint32_t* voxelGrid){
auto grid = cg::this_grid();
int maxTriangles = 200'000;
Triangles* triangles = allocator->alloc<Triangles*>(sizeof(Triangles));
triangles->positions = allocator->alloc<float3*>(3 * maxTriangles * sizeof(float3));
triangles->uvs = allocator->alloc<float2*>(2 * maxTriangles * sizeof(float2));
triangles->colors = allocator->alloc<uint32_t*>(maxTriangles * sizeof(float3));
triangles->numTriangles = 0;
float3 boxSize = gridMax - gridMin;
grid.sync();
processRange(0, gridSize * gridSize * gridSize, [&](int voxelIndex){
int x = voxelIndex % gridSize;
int y = (voxelIndex % (gridSize * gridSize)) / gridSize;
int z = voxelIndex / (gridSize * gridSize);
if(x >= gridSize - 1) return;
if(y >= gridSize - 1) return;
if(z >= gridSize - 1) return;
auto to1DIndex = [&](int x, int y, int z){
return x + y * gridSize + z * gridSize * gridSize;
};
auto fromMCIndex = [&](int index) -> int3{
if(index == 0) return int3{0, 0, 0};
if(index == 1) return int3{1, 0, 0};
if(index == 2) return int3{1, 1, 0};
if(index == 3) return int3{0, 1, 0};
if(index == 4) return int3{0, 0, 1};
if(index == 5) return int3{1, 0, 1};
if(index == 6) return int3{1, 1, 1};
if(index == 7) return int3{0, 1, 1};
};
auto getValue = [&](int mcIndex){
int3 index3D = fromMCIndex(mcIndex);
int index = to1DIndex(x + index3D.x, y + index3D.y, z + index3D.z);
float value = voxelGrid[index];
if(value == 0.0f){
}else{
value = 1.0f;
}
return value;
};
auto getXYZ = [&](int mcIndex){
int3 xyz_i = fromMCIndex(mcIndex);
float3 xyz;
xyz.x = boxSize.x * float(x + xyz_i.x) / fGridSize + gridMin.x;
xyz.y = boxSize.y * float(y + xyz_i.y) / fGridSize + gridMin.y;
xyz.z = boxSize.z * float(z + xyz_i.z) / fGridSize + gridMin.z;
return xyz;
};
uint32_t cubeindex = 0;
if(getValue(0) > 0.0f) cubeindex |= 1;
if(getValue(1) > 0.0f) cubeindex |= 2;
if(getValue(2) > 0.0f) cubeindex |= 4;
if(getValue(3) > 0.0f) cubeindex |= 8;
if(getValue(4) > 0.0f) cubeindex |= 16;
if(getValue(5) > 0.0f) cubeindex |= 32;
if(getValue(6) > 0.0f) cubeindex |= 64;
if(getValue(7) > 0.0f) cubeindex |= 128;
if (edgeTable[cubeindex] == 0) return;
// list of vertices from isosurface-cube intersections
float3 vertices[12];
const int* et = edgeTable;
// voxels are either "inside" (=0) or "outside" (>0) the isosurce
auto getVertex = [](float3 p0, float3 p1, float value_0, float value_1){
if(value_0 > 0.0f) return p0;
if(value_1 > 0.0f) return p1;
return p0;
};
if (et[cubeindex] & 1) vertices[ 0] = getVertex(getXYZ(0), getXYZ(1), getValue(0), getValue(1));
if (et[cubeindex] & 2) vertices[ 1] = getVertex(getXYZ(1), getXYZ(2), getValue(1), getValue(2));
if (et[cubeindex] & 4) vertices[ 2] = getVertex(getXYZ(2), getXYZ(3), getValue(2), getValue(3));
if (et[cubeindex] & 8) vertices[ 3] = getVertex(getXYZ(3), getXYZ(0), getValue(3), getValue(0));
if (et[cubeindex] & 16) vertices[ 4] = getVertex(getXYZ(4), getXYZ(5), getValue(4), getValue(5));
if (et[cubeindex] & 32) vertices[ 5] = getVertex(getXYZ(5), getXYZ(6), getValue(5), getValue(6));
if (et[cubeindex] & 64) vertices[ 6] = getVertex(getXYZ(6), getXYZ(7), getValue(6), getValue(7));
if (et[cubeindex] & 128) vertices[ 7] = getVertex(getXYZ(7), getXYZ(4), getValue(7), getValue(4));
if (et[cubeindex] & 256) vertices[ 8] = getVertex(getXYZ(0), getXYZ(4), getValue(0), getValue(4));
if (et[cubeindex] & 512) vertices[ 9] = getVertex(getXYZ(1), getXYZ(5), getValue(1), getValue(5));
if (et[cubeindex] & 1024) vertices[10] = getVertex(getXYZ(2), getXYZ(6), getValue(2), getValue(6));
if (et[cubeindex] & 2048) vertices[11] = getVertex(getXYZ(3), getXYZ(7), getValue(3), getValue(7));
// create up to 5 triangles per cube (http://paulbourke.net/geometry/polygonise/marchingsource.cpp)
for (int i = 0; i < 5; i++){
if(triTable[cubeindex][3 * i] < 0) break;
int index = atomicAdd(&triangles->numTriangles, 1);
if(index >= maxTriangles) break;
triangles->positions[3 * index + 2] = vertices[triTable[cubeindex][3 * i + 0]];
triangles->positions[3 * index + 1] = vertices[triTable[cubeindex][3 * i + 1]];
triangles->positions[3 * index + 0] = vertices[triTable[cubeindex][3 * i + 2]];
triangles->colors[3 * index + 2] = (2 * x) | (2 * y) << 8 | (2 * z) << 16;
triangles->colors[3 * index + 1] = (2 * x) | (2 * y) << 8 | (2 * z) << 16;
triangles->colors[3 * index + 0] = (2 * x) | (2 * y) << 8 | (2 * z) << 16;
}
});
return triangles;
}
extern "C" __global__
void kernel(
const Uniforms _uniforms,
uint32_t* buffer,
cudaSurfaceObject_t gl_colorbuffer_main,
cudaSurfaceObject_t gl_colorbuffer_vr_left,
cudaSurfaceObject_t gl_colorbuffer_vr_right,
uint32_t numTriangles,
float3* positions,
float2* uvs,
uint32_t* colors,
uint32_t* textureData
){
auto grid = cg::this_grid();
auto block = cg::this_thread_block();
asm volatile("mov.u64 %0, %%globaltimer;" : "=l"(nanotime_start));
uniforms = _uniforms;
Allocator _allocator(buffer, 0);
allocator = &_allocator;
uint32_t* voxelGrid = allocator->alloc<uint32_t*>(numCells * sizeof(uint32_t));
// clear/initialize voxel grid, if necessary. Note that this is done every frame.
// processRange(0, numCells, [&](int voxelIndex){
// int x = voxelIndex % gridSize;
// int y = voxelIndex % (gridSize * gridSize) / gridSize;
// int z = voxelIndex / (gridSize * gridSize);
// float fx = 2.0f * float(x) / fGridSize - 1.0f;
// float fy = 2.0f * float(y) / fGridSize - 1.0f;
// float fz = 2.0f * float(z) / fGridSize - 1.0f;
// // clear and make sphere and ground plane
// // if(fx * fx + fy * fy + fz * fz < 0.1f){
// // voxelGrid[voxelIndex] = 123;
// // }else if(x > 10 && x < gridSize - 10 && z < 4){
// // voxelGrid[voxelIndex] = 123;
// // }else{
// // voxelGrid[voxelIndex] = 0;
// // }
// // clear everything
// voxelGrid[voxelIndex] = 0;
// });
// allocate framebuffer memory
int framebufferSize = int(uniforms.width) * int(uniforms.height) * sizeof(uint64_t);
uint64_t* framebuffer = allocator->alloc<uint64_t*>(framebufferSize);
uint64_t* fb_vr_left = allocator->alloc<uint64_t*>(int(uniforms.vr_left_width) * int(uniforms.vr_left_height) * sizeof(uint64_t));
uint64_t* fb_vr_right = allocator->alloc<uint64_t*>(int(uniforms.vr_right_width) * int(uniforms.vr_right_height) * sizeof(uint64_t));