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127 lines
3.6 KiB
127 lines
3.6 KiB
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float4 white_light(float4 input, float3 light, int3 mask) {
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input.w = input.w + acos(
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dot(
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normalize(light),
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normalize(fabs(convert_float3(mask)))
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)
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) / 2;
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return input;
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}
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__kernel void min_kern(
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global char* map,
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global int3* map_dim,
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global int2* resolution,
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global float3* projection_matrix,
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global float3* cam_dir,
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global float3* cam_pos,
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global float* lights,
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global int* light_count,
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__write_only image2d_t image
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){
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size_t id = get_global_id(0);
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int2 pixel = {id % resolution->x, id / resolution->x};
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float3 ray_dir = projection_matrix[pixel.x + resolution->x * pixel.y];
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ray_dir = (float3)(
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ray_dir.z * sin(cam_dir->y) + ray_dir.x * cos(cam_dir->y),
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ray_dir.y,
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ray_dir.z * cos(cam_dir->y) - ray_dir.x * sin(cam_dir->y)
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);
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ray_dir = (float3)(
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ray_dir.x * cos(cam_dir->z) - ray_dir.y * sin(cam_dir->z),
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ray_dir.x * sin(cam_dir->z) + ray_dir.y * cos(cam_dir->z),
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ray_dir.z
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);
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// Setup the voxel step based on what direction the ray is pointing
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int3 voxel_step = {1, 1, 1};
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voxel_step *= (ray_dir > 0) - (ray_dir < 0);
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/*voxel_step.x *= (ray_dir.x > 0) - (ray_dir.x < 0);
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voxel_step.y *= (ray_dir.y > 0) - (ray_dir.y < 0);
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voxel_step.z *= (ray_dir.z > 0) - (ray_dir.z < 0);*/
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// Setup the voxel coords from the camera origin
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int3 voxel = convert_int3(*cam_pos);
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// Delta T is the units a ray must travel along an axis in order to
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// traverse an integer split
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float3 delta_t = fabs(1.0f / ray_dir);
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// Intersection T is the collection of the next intersection points
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// for all 3 axis XYZ.
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float3 intersection_t = delta_t;
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int2 randoms = { 3, 14 };
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uint seed = randoms.x + id;
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uint t = seed ^ (seed << 11);
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uint result = randoms.y ^ (randoms.y >> 19) ^ (t ^ (t >> 8));
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int max_dist = 500 + result % 50;
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int dist = 0;
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int3 mask = { 0, 0, 0 };
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// Andrew Woo's raycasting algo
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do {
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mask = intersection_t.xyz <= min(intersection_t.yzx, intersection_t.zxy);
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float3 thing = delta_t * fabs(convert_float3(mask.xyz));
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intersection_t += delta_t * fabs(convert_float3(mask.xyz));
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voxel.xyz += voxel_step.xyz * mask.xyz;
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// If the ray went out of bounds
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int3 overshoot = voxel <= *map_dim;
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int3 undershoot = voxel > 0;
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if (overshoot.x == 0 || overshoot.y == 0 || overshoot.z == 0 || undershoot.x == 0 || undershoot.y == 0){
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write_imagef(image, pixel, (float4)(.73, .81, .89, 1.0));
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return;
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}
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if (undershoot.z == 0) {
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write_imagef(image, pixel, (float4)(.14, .30, .50, 1.0));
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return;
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}
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// If we hit a voxel
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int index = voxel.x + map_dim->x * (voxel.y + map_dim->z * voxel.z);
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int voxel_data = map[index];
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if (voxel_data != 0) {
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switch (voxel_data) {
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case 1:
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write_imagef(image, pixel, (float4)(.50, .00, .00, 1));
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return;
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case 2:
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write_imagef(image, pixel, (float4)(.00, .50, .40, 1.00));
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return;
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case 3:
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write_imagef(image, pixel, (float4)(.00, .00, .50, 1.00));
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return;
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case 4:
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write_imagef(image, pixel, (float4)(.25, .00, .25, 1.00));
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return;
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case 5:
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//write_imagef(image, pixel, (float4)(.25, .00, .25, 1.00));
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write_imagef(image, pixel, white_light((float4)(.25, .32, .14, 0.2), (float3)(lights[7], lights[8], lights[9]), mask));
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return;
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case 6:
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write_imagef(image, pixel, (float4)(.30, .80, .10, 1.00));
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return;
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}
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}
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dist++;
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} while (dist < max_dist);
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write_imagef(image, pixel, (float4)(.73, .81, .89, 1.0));
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return;
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} |