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Differential D16886 Diff 59669 intern/cycles/kernel/svm/sky.h

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intern/cycles/kernel/svm/sky.h

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/* Nishita improved sky model */ /* Nishita improved sky model */
ccl_device float3 geographical_to_direction(float lat, float lon) ccl_device float3 geographical_to_direction(float lat, float lon)
{ {
return make_float3(cosf(lat) * cosf(lon), cosf(lat) * sinf(lon), sinf(lat)); return make_float3(cosf(lat) * cosf(lon), cosf(lat) * sinf(lon), sinf(lat));
} }
ccl_device float3 sky_radiance_nishita(KernelGlobals kg, ccl_device float3 sky_radiance_nishita(KernelGlobals kg,
float3 dir, float3 dir,
uint32_t path_flag,
float3 pixel_bottom, float3 pixel_bottom,
float3 pixel_top, float3 pixel_top,
ccl_private float *nishita_data, ccl_private float *nishita_data,
uint texture_id) uint texture_id)
{ {
/* definitions */ /* definitions */
float sun_elevation = nishita_data[0]; float sun_elevation = nishita_data[0];
float sun_rotation = nishita_data[1]; float sun_rotation = nishita_data[1];
float angular_diameter = nishita_data[2]; float angular_diameter = nishita_data[2];
float sun_intensity = nishita_data[3]; float sun_intensity = nishita_data[3];
bool sun_disc = (angular_diameter >= 0.0f); bool sun_disc = (angular_diameter >= 0.0f);
float3 xyz; float3 xyz;
/* convert dir to spherical coordinates */ /* convert dir to spherical coordinates */
float2 direction = direction_to_spherical(dir); float2 direction = direction_to_spherical(dir);
/* render above the horizon */ /* render above the horizon */
if (dir.z >= 0.0f) { if (dir.z >= 0.0f) {
/* definitions */ /* definitions */
float3 sun_dir = geographical_to_direction(sun_elevation, sun_rotation + M_PI_2_F); float3 sun_dir = geographical_to_direction(sun_elevation, sun_rotation + M_PI_2_F);
float sun_dir_angle = precise_angle(dir, sun_dir); float sun_dir_angle = precise_angle(dir, sun_dir);
float half_angular = angular_diameter / 2.0f; float half_angular = angular_diameter / 2.0f;
float dir_elevation = M_PI_2_F - direction.x; float dir_elevation = M_PI_2_F - direction.x;
/* if ray inside sun disc render it, otherwise render sky */ /* if ray inside sun disc render it, otherwise render sky.
if (sun_disc && sun_dir_angle < half_angular) { * alternatively, ignore the sun if we're evaluating the background texture. */
if (sun_disc && sun_dir_angle < half_angular && !(path_flag & PATH_RAY_IMPORTANCE_BAKE)) {
/* get 2 pixels data */ /* get 2 pixels data */
float y; float y;
/* sun interpolation */ /* sun interpolation */
if (sun_elevation - half_angular > 0.0f) { if (sun_elevation - half_angular > 0.0f) {
if (sun_elevation + half_angular > 0.0f) { if (sun_elevation + half_angular > 0.0f) {
y = ((dir_elevation - sun_elevation) / angular_diameter) + 0.5f; y = ((dir_elevation - sun_elevation) / angular_diameter) + 0.5f;
xyz = interp(pixel_bottom, pixel_top, y) * sun_intensity; xyz = interp(pixel_bottom, pixel_top, y) * sun_intensity;
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} }
} }
/* convert to RGB */ /* convert to RGB */
return xyz_to_rgb_clamped(kg, xyz); return xyz_to_rgb_clamped(kg, xyz);
} }
ccl_device_noinline int svm_node_tex_sky( ccl_device_noinline int svm_node_tex_sky(
KernelGlobals kg, ccl_private ShaderData *sd, ccl_private float *stack, uint4 node, int offset) KernelGlobals kg, ccl_private ShaderData *sd, uint32_t path_flag, ccl_private float *stack, uint4 node, int offset)
{ {
/* Load data */ /* Load data */
uint dir_offset = node.y; uint dir_offset = node.y;
uint out_offset = node.z; uint out_offset = node.z;
int sky_model = node.w; int sky_model = node.w;
float3 dir = stack_load_float3(stack, dir_offset); float3 dir = stack_load_float3(stack, dir_offset);
float3 f; float3 f;
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nishita_data[1] = data.w; nishita_data[1] = data.w;
data = read_node_float(kg, &offset); data = read_node_float(kg, &offset);
nishita_data[2] = data.x; nishita_data[2] = data.x;
nishita_data[3] = data.y; nishita_data[3] = data.y;
uint texture_id = __float_as_uint(data.z); uint texture_id = __float_as_uint(data.z);
/* Compute Sky */ /* Compute Sky */
f = sky_radiance_nishita(kg, dir, pixel_bottom, pixel_top, nishita_data, texture_id); f = sky_radiance_nishita(kg, dir, path_flag, pixel_bottom, pixel_top, nishita_data, texture_id);
} }
stack_store_float3(stack, out_offset, f); stack_store_float3(stack, out_offset, f);
return offset; return offset;
} }
CCL_NAMESPACE_END CCL_NAMESPACE_END