mitchellhansen
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voxel-raycaster
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really bad crashing, need to debug this on a cpu only machine

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master
mitchellhansen 7 years ago
parent 8f822e14f7
commit 8f6ecae4cb
2 changed files with 207 additions and 185 deletions
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150
kernels/ray_caster_kernel.cl
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@ -1,3 +1,19 @@
/*
Notes:
Keep this is mind when masking the voxel steps, pretty unintuitive behaviour
For scalar types, the equality operators return 0 if false and return 1 if true
For vector types, the equality operators return 0 if false and return -1 if true (i.e. all bits set)
The equality equal (==) returns 0 if one or both arguments are not a number (NaN).
The equality not equal (!=) returns 1 (for scalar source operands) or -1 (for vector source
operands) if one or both arguments are not a number (NaN).
if statements will take 0 as false and any other integer as true
*/
// =========================================================================
// ======================== INITIALIZER CONSTANTS ==========================
@ -128,8 +144,9 @@ struct TraversalState get_oct_vox(
ts.current_descriptor_index = setting(OCTREE_ROOT_INDEX);
ts.current_descriptor = octree_descriptor_buffer[ts.current_descriptor_index];
ts.scale = 0;
ts.parent_stack_position = 0;
ts.found = false;
ts.parent_stack[ts.scale] = ts.current_descriptor;
ts.parent_stack[0] = ts.current_descriptor;
// Set our initial dimension and the position at the corner of the oct to keep track of our position
int dimension = setting(OCTDIM);
@ -190,6 +207,7 @@ struct TraversalState get_oct_vox(
// If all went well and we found a valid non-leaf oct then we will traverse further down the hierarchy
ts.scale++;
ts.parent_stack_position++;
dimension /= 2;
// Count the number of valid octs that come before and add it to the index to get the position
@ -210,8 +228,8 @@ struct TraversalState get_oct_vox(
ts.current_descriptor = octree_descriptor_buffer[ts.current_descriptor_index];
ts.parent_stack[ts.scale] = ts.current_descriptor;
ts.parent_stack[ts.parent_stack_position] = ts.current_descriptor;
ts.parent_stack_index[ts.parent_stack_position] = ts.current_descriptor_index;
}
else {
// If the oct was not valid, then no CP's exists any further
@ -271,14 +289,16 @@ __kernel void raycaster(
ray_dir.x * sin((*cam_dir).y) + ray_dir.y * cos((*cam_dir).y),
ray_dir.z
);
if (any(ray_dir == zeroed_float3))
return;
// Setup the voxel step based on what direction the ray is pointing
int3 voxel_step = {1, 1, 1};
voxel_step *= (ray_dir > 0) - (ray_dir < 0);
// Correct opencl for being stupid and giving us negative for true
int3 voxel_step = (-1, -1, -1) * ((ray_dir > 0) - (ray_dir < 0));
// Setup the voxel coords from the camera origin
// rtn = round towards negative
int3 voxel = convert_int3_rtn(*cam_pos);
//voxel = voxel + convert_int3(*cam_pos < 0.0f);
@ -287,12 +307,11 @@ __kernel void raycaster(
float3 delta_t = fabs(1.0f / ray_dir);
// Intersection T is the collection of the next intersection points
// for all 3 axis XYZ. We take the full positive cardinality when
// for all 3 axis XYZ. We take the full negative cardinality when
// subtracting the floor, so we must transfer the sign over from
// the voxel step
float3 offset = delta_t * ((*cam_pos) - ceil(*cam_pos));
float3 intersection_t = offset* convert_float3(voxel_step);
float3 offset = delta_t * (floor(*cam_pos) - (*cam_pos));
float3 intersection_t = offset * convert_float3(voxel_step);
// When we transfer the sign over, we get the correct direction of
// the offset, but we merely transposed over the value instead of mirroring
@ -325,7 +344,7 @@ __kernel void raycaster(
octree_attachment_buffer,
settings_buffer);
int jump_power = (int)log2((float)vox_dim) - traversal_state.scale;
int jump_power = (int)pow((float)2, log2((float)vox_dim) - (float)traversal_state.scale);
int prev_jump_power = jump_power;
int3 last_oct_pos = (0);
// TODO: DEBUG
@ -334,25 +353,23 @@ __kernel void raycaster(
// Andrew Woo's raycasting algo
while (distance_traveled < max_distance && bounce_count < 2) {
if (jump_power == 2){
color_accumulator = mix((1.0f, 1.0f, 1.0f, 1.0f), (1.0f, 1.0f, 1.0f, 1.0f), 1.0f - max(distance_traveled / 700.0f, 0.0f));
color_accumulator.w *= 4;
break;
}
// If we hit a voxel
if (setting(OCTENABLED) == 0 && voxel.x < (*map_dim).x/2 && voxel.y < (*map_dim).x/2 && voxel.z < (*map_dim).x/2){
//if (setting(OCTENABLED) == 0 && voxel.x < (*map_dim).x && voxel.y < (*map_dim).x && voxel.z < (*map_dim).x){
// // traversal_state = get_oct_vox(
// // voxel,
// // octree_descriptor_buffer,
// // octree_attachment_lookup_buffer,
// // octree_attachment_buffer,
// // settings_buffer);
// if (traversal_state.found){
// voxel_data = 5;
// } else {
// voxel_data = 0;
// }
//
if (setting(OCTENABLED) == 0 && voxel.x < (*map_dim).x/2 && voxel.y < (*map_dim).x/2 && voxel.z < (*map_dim).x) {
// Fancy no branch version of the logic step
face_mask = 1 + (intersection_t.xyz <= min(intersection_t.yzx, intersection_t.zxy));
traversal_state = get_oct_vox(
voxel,
octree_descriptor_buffer,
octree_attachment_lookup_buffer,
octree_attachment_buffer,
settings_buffer);
// True will result in a -1, e.g (0, 0, -1) so negate it to positive
face_mask = -1 * (intersection_t.xyz <= min(intersection_t.yzx, intersection_t.zxy));
prev_jump_power = jump_power;
@ -360,18 +377,16 @@ __kernel void raycaster(
// Test for out of bounds contions, add fog
if (any(voxel >= *map_dim) || any(voxel < 0)){
voxel.xyz -= voxel_step.xyz * face_mask.xyz;
voxel.xyz -= voxel_step.xyz * jump_power * face_mask.xyz;
color_accumulator = mix(fog_color, voxel_color, 1.0f - max(distance_traveled / 700.0f, 0.0f));
color_accumulator.w *= 4;
break;
}
uchar prev_val = traversal_state.idx_stack[traversal_state.scale];
uchar this_face_mask = 0;
// Check the voxel face that we traversed
// and increment the idx in the idx stack
if (face_mask.x) {
this_face_mask = idx_set_x_mask;
}
@ -381,6 +396,8 @@ __kernel void raycaster(
else if (face_mask.z) {
this_face_mask = idx_set_z_mask;
}
// and increment the idx in the idx stack
traversal_state.idx_stack[traversal_state.scale] ^= this_face_mask;
// Mask index is the 1D index'd value of the idx for interaction with the valid / leaf masks
@ -389,15 +406,13 @@ __kernel void raycaster(
// Whether or not the next oct we want to enter in the current CD's valid mask is 1 or 0
bool is_valid = false;
// TODO: Rework this logic so we don't have this bodgy if
if (mask_index > prev_val)
is_valid = (traversal_state.parent_stack[traversal_state.parent_stack_position] >> 16) & mask_8[mask_index];
// Check to see if the idx increased or decreased
// If it decreased
// If it decreased, thus invalid
// Pop up the stack until the oct that the idx flip is valid and we landed on a valid oct
failsafe = 0;
if (mask_index > prev_val) // TODO: Rework this logic so we don't have this bodgy if
is_valid = (traversal_state.parent_stack[traversal_state.parent_stack_position] >> 16) & mask_8[mask_index];
while (mask_index < prev_val || !is_valid) {
jump_power *= 2;
@ -433,7 +448,7 @@ __kernel void raycaster(
is_valid = (traversal_state.parent_stack[traversal_state.parent_stack_position] >> 16) & mask_8[mask_index];
failsafe++;
if (failsafe > 20)
if (failsafe > 50)
break;
}
@ -507,26 +522,30 @@ __kernel void raycaster(
is_valid = (traversal_state.parent_stack[traversal_state.parent_stack_position] >> 16) & mask_8[mask_index];
failsafe++;
if (failsafe > 20)
if (failsafe > 50)
break;
}
// intersection_t += delta_t * jump_power * fabs(convert_float3(face_mask.xyz));
//
// //int3 other_faces = face_mask == 1 ? 1 : -1;
// int3 other_faces = select((int3)(1,1,1), (int3)(0,0,0), (int3)(face_mask == 1));
// //int3 added_diff = last_oct_pos + prev_jump_power - traversal_state.oct_pos;
//
// uint3 multiplier = (1, 1, 1);//convert_uint3(abs(traversal_state.oct_pos - last_oct_pos) * (1.0f/prev_jump_power));
//
// last_oct_pos = traversal_state.oct_pos;
//
// intersection_t -= delta_t * prev_jump_power * convert_float3(other_faces.xyz);
// intersection_t += delta_t * convert_float3(multiplier) * jump_power * fabs(convert_float3(other_faces.xyz));
// Add the delta for the jump power and the traversed face
intersection_t += delta_t * jump_power * fabs(convert_float3(face_mask.xyz));
// Get the other faces
int3 other_faces = select((int3)(1,1,1), (int3)(0,0,0), (int3)(face_mask == 1));
// Get the amount of times we need to multiply the delta t to get to our face
uint3 multiplier = convert_uint3(abs(traversal_state.oct_pos - last_oct_pos) * (1.0f/prev_jump_power));
last_oct_pos = traversal_state.oct_pos;
// Go back to the beginning intersection t's for the non traversed faces
intersection_t -= delta_t * prev_jump_power * convert_float3(other_faces.xyz);
// add back the intersection for our current jump power
intersection_t += delta_t * convert_float3(multiplier) * jump_power * fabs(convert_float3(other_faces.xyz));
if (traversal_state.scale == 1 && is_valid){
voxel_data = 5;
//voxel.xyz -= voxel_step.xyz * face_mask.xyz;
color_accumulator = mix((1.0f, 1.0f, 1.0f, 1.0f), (1.0f, 1.0f, 1.0f, 1.0f), 1.0f - max(distance_traveled / 700.0f, 0.0f));
color_accumulator.w *= 4;
@ -534,9 +553,10 @@ __kernel void raycaster(
}
//voxel_data = map[voxel.x + (*map_dim).x * (voxel.y + (*map_dim).z * (voxel.z))];
} else {
// Fancy no branch version of the logic step
face_mask = intersection_t.xyz <= min(intersection_t.yzx, intersection_t.zxy);
intersection_t += delta_t * fabs(convert_float3(face_mask.xyz));
// True will result in a -1, e.g (0, 0, -1) so negate it to positive
face_mask = -1 * (intersection_t.xyz <= min(intersection_t.yzx, intersection_t.zxy));
intersection_t += delta_t * convert_float3(face_mask.xyz);
voxel.xyz += voxel_step.xyz * face_mask.xyz;
// Test for out of bounds contions, add fog
@ -551,14 +571,17 @@ __kernel void raycaster(
if (voxel_data == 5 || voxel_data == 6) {
// Determine where on the 2d plane the ray intersected
face_position = zeroed_float3;
tile_face_position = zeroed_float2;
// Collect the sign of the face hit for ray redirection
sign = (1.0f, 1.0f, 1.0f);
// First determine the percent of the way the ray is towards the next intersection_t
// in relation to the xyz position on the plane
if (face_mask.x == -1) {
if (face_mask.x == 1) {
sign.x *= -1.0;
@ -573,7 +596,7 @@ __kernel void raycaster(
face_position = (float3)(1.00001f, y_percent, z_percent);
tile_face_position = face_position.yz;
}
else if (face_mask.y == -1) {
else if (face_mask.y == 1) {
sign.y *= -1.0;
float x_percent = (intersection_t.x - (intersection_t.y - delta_t.y)) / delta_t.x;
@ -582,7 +605,7 @@ __kernel void raycaster(
tile_face_position = face_position.xz;
}
else if (face_mask.z == -1) {
else if (face_mask.z == 1) {
sign.z *= -1.0;
float x_percent = (intersection_t.x - (intersection_t.z - delta_t.z)) / delta_t.x;
@ -608,14 +631,14 @@ __kernel void raycaster(
// We run into the Hairy ball problem, so we need to define
// a special case for the zmask
if (face_mask.z == -1) {
if (face_mask.z == 1) {
tile_face_position.x = 1.0f - tile_face_position.x;
tile_face_position.y = 1.0f - tile_face_position.y;
}
}
face_position.z = select((face_position.z), (-face_position.z + 1.0f), (int)(ray_dir.z > 0));
tile_face_position.y = select((tile_face_position.y), (-tile_face_position.y + 1.0f), (int)(ray_dir.z < 0));
face_position.z = select((face_position.z), (-face_position.z + 1.0f), -1 * (int)(ray_dir.z > 0));
tile_face_position.y = select((tile_face_position.y), (-tile_face_position.y + 1.0f), -1 * (int)(ray_dir.z < 0));
// Now we detect what type of of voxel we intersected and decide whether
// to bend the ray, send out a light intersection ray, or add texture color
@ -647,10 +670,10 @@ __kernel void raycaster(
return;
voxel -= voxel_step * face_mask;
voxel_step = ( 1, 1, 1 ) * ((ray_dir > 0) - (ray_dir < 0));
voxel_step = ( -1, -1, -1 ) * ((ray_dir > 0) - (ray_dir < 0));
delta_t = fabs(1.0f / ray_dir);
intersection_t = delta_t * ((hit_pos)-floor(hit_pos)) * convert_float3(voxel_step);
intersection_t = delta_t * ((hit_pos) - floor(hit_pos)) * convert_float3(voxel_step);
intersection_t += delta_t * -convert_float3(isless(intersection_t, 0));
// REFLECTION
@ -670,8 +693,7 @@ __kernel void raycaster(
return;
voxel -= voxel_step * face_mask;
voxel_step = ( 1, 1, 1 );
voxel_step *= (ray_dir > 0) - (ray_dir < 0);
voxel_step = ( -1, -1, -1 ) * (ray_dir > 0) - (ray_dir < 0);
delta_t = fabs(1.0f / ray_dir);
intersection_t = delta_t * ((hit_pos)-floor(hit_pos)) * convert_float3(voxel_step);

4
src/Application.cpp
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@ -51,8 +51,8 @@ bool Application::init_clcaster() {
raycaster->assign_map(map);
camera = std::make_shared<Camera>(
sf::Vector3f(30.5f, 30.5f, 30.5f), // Starting position
sf::Vector2f(1.57f, 0.0f), // Direction
sf::Vector3f(30.5f, 30.5f, 10.5f), // Starting position
sf::Vector2f(1.50f, -2.0f), // Direction
window.get()
);
raycaster->assign_camera(camera);

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