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/**
* Renders heterogeneous volumes.
**/
#pragma BLENDER_REQUIRE(common_view_lib.glsl)
#pragma BLENDER_REQUIRE(common_math_lib.glsl)
#pragma BLENDER_REQUIRE(eevee_volume_lib.glsl)
#pragma BLENDER_REQUIRE(eevee_volume_eval_lib.glsl)
#pragma BLENDER_REQUIRE(eevee_gbuffer_lib.glsl)
uniform sampler2D depth_max_tx;
layout(location = 0) out uvec4 out_volume_data; /* Volume Emission, Absorption, Scatter. */
layout(location = 1) out vec4 out_transparency_data; /* Transparent BSDF, Holdout. */
void main(void)
{
// g_volume = init_globals();
vec2 uv = gl_FragCoord.xy / vec2(textureSize(depth_max_tx, 0).xy);
/* For volumes from solid objects. */
vec3 vP_start = get_view_space_from_depth(uv, gl_FragCoord.z);
vec3 vP_end = get_view_space_from_depth(uv, texture(depth_max_tx, uv).r);
Ray ray;
ray.origin = vP_start;
ray.direction = vP_end - vP_start;
ray.direction /= abs(ray.direction.z);
ray.max_time = max(vP_start.z - vP_end.z, 0.0);
/* Refine bounds to skip empty areas. */
// float dist = line_unit_box_intersect_dist(ls_ray_ori, ls_ray_dir);
// if (dist > 0.0) {
// ls_ray_ori = ls_ray_dir * dist + ls_ray_ori;
// }
// vec3 ls_vol_isect = ls_ray_end - ls_ray_ori;
// if (dot(ls_ray_dir, ls_vol_isect) < 0.0) {
// /* Start is further away than the end.
// * That means no volume is intersected. */
// discard;
// }
vec3 out_depth_time;
vec3 out_radiance = vec3(0.0);
vec3 out_transmittance = vec3(1.0);
// volume_eval_scattering_transmittance(
// P, depth_min, depth_max, out_radiance, out_transmittance, gl_FragDepth);
volume_eval_homogenous(ray, out_transmittance, out_depth_time);
gl_FragDepth = get_depth_from_view_z(ray.origin.z - avg(out_depth_time));
g_volume_data.emission = vec3(0);
g_volume_data.scattering = out_radiance;
g_volume_data.transmittance = out_transmittance;
g_volume_data.anisotropy = VOLUME_HETEROGENEOUS;
g_transparency_data.transmittance = vec3(1.0);
g_transparency_data.holdout = 0.0;
out_volume_data = gbuffer_store_volume_data(g_volume_data);
out_transparency_data = gbuffer_store_transparency_data(g_transparency_data);
}
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