mitchellhansen/voxel-raycaster
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Changed to non branching algo, sped up a good 30-50 ms at the current max

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ray dist. Also changed bounds checking a little, not sure if it's faster
This commit is contained in:
MitchellHansen
2016-09-04 23:59:39 -07:00
parent 160756186d
commit 6f5d2b2f6f
4 changed files with 84 additions and 77 deletions
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93
kernels/minimal_kernel.cl
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@@ -73,67 +73,64 @@ __kernel void min_kern(
int face = -1;
// X:0, Y:1, Z:2
int3 mask = { 0, 0, 0 };
// Andrew Woo's raycasting algo
do {
if ((intersection_t.x) < (intersection_t.y)) {
if ((intersection_t.x) < (intersection_t.z)) {
face = 0;
voxel.x += voxel_step.x;
intersection_t.x = intersection_t.x + delta_t.x;
} else {
mask = intersection_t.xyz <= min(intersection_t.yzx, intersection_t.zxy);
float3 thing = delta_t * fabs(convert_float3(mask.xyz));
intersection_t += delta_t * fabs(convert_float3(mask.xyz));
voxel.xyz += voxel_step.xyz * mask.xyz;
face = 2;
voxel.z += voxel_step.z;
intersection_t.z = intersection_t.z + delta_t.z;
}
} else {
if ((intersection_t.y) < (intersection_t.z)) {
face = 1;
voxel.y += voxel_step.y;
intersection_t.y = intersection_t.y + delta_t.y;
} else {
face = 2;
voxel.z += voxel_step.z;
intersection_t.z = intersection_t.z + delta_t.z;
}
}
// If the ray went out of bounds
if (voxel.z >= map_dim->z) {
write_imagef(image, pixel, (float4)(.5, .50, .00, 1));
return;
}
if (voxel.x >= map_dim->x) {
write_imagef(image, pixel, (float4)(.00, .00, .99, 1));
return;
}
if (voxel.y >= map_dim->x) {
write_imagef(image, pixel, (float4)(.00, .44, .00, 1));
return;
}
int3 overshoot = voxel.xyz <= map_dim->xyz;
int3 undershoot = voxel > 0;
if (voxel.x < 0) {
write_imagef(image, pixel, (float4)(.99, .00, .99, 1));
return;
}
if (voxel.y < 0) {
write_imagef(image, pixel, (float4)(.99, .99, .00, 1));
return;
}
if (voxel.z < 0) {
write_imagef(image, pixel, (float4)(.00, .99, .99, 1));
return;
}
//if (id == 240000)
// printf("%i, %i, %i\n", overshoot.x, overshoot.y, overshoot.z);
//if (id == 240000)
// printf("%i, %i, %i\n", undershoot.x, undershoot.y, undershoot.z);
if (overshoot.x == 0|| overshoot.y == 0 || overshoot.z == 0){
write_imagef(image, pixel, (float4)(.50 * abs(overshoot.x), .50 * abs(overshoot.y), .50 * abs(overshoot.z), 1));
return;
}
if (undershoot.x == 0 || undershoot.y == 0 || undershoot.z == 0) {
write_imagef(image, pixel, (float4)(.1 * abs(undershoot.x), .80 * abs(undershoot.y), .20 * abs(undershoot.z), 1));
return;
}
//if (voxel.x >= map_dim->x) {
// write_imagef(image, pixel, (float4)(.00, .00, .99, 1));
// return;
//}
//if (voxel.y >= map_dim->x) {
// write_imagef(image, pixel, (float4)(.00, .44, .00, 1));
// return;
//}
//if (voxel.x < 0) {
// write_imagef(image, pixel, (float4)(.99, .00, .99, 1));
// return;
//}
//if (voxel.y < 0) {
// write_imagef(image, pixel, (float4)(.99, .99, .00, 1));
// return;
//}
//if (voxel.z < 0) {
// write_imagef(image, pixel, (float4)(.00, .99, .99, 1));
// return;
//}
// If we hit a voxel
int index = voxel.x + map_dim->x * (voxel.y + map_dim->z * voxel.z);
int voxel_data = map[index];
//if (id == 240000)
//printf("%i, %i, %i\n", voxel.x, voxel.y, voxel.z);
if (voxel_data != 0) {
switch (voxel_data) {