diff options
Diffstat (limited to 'servers/rendering/renderer_rd/shaders/environment/sdfgi_debug.glsl')
| -rw-r--r-- | servers/rendering/renderer_rd/shaders/environment/sdfgi_debug.glsl | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/servers/rendering/renderer_rd/shaders/environment/sdfgi_debug.glsl b/servers/rendering/renderer_rd/shaders/environment/sdfgi_debug.glsl new file mode 100644 index 0000000000..af5f7d0a58 --- /dev/null +++ b/servers/rendering/renderer_rd/shaders/environment/sdfgi_debug.glsl @@ -0,0 +1,178 @@ +#[compute] + +#version 450 + +#VERSION_DEFINES + +layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in; + +#define MAX_CASCADES 8 + +layout(set = 0, binding = 1) uniform texture3D sdf_cascades[MAX_CASCADES]; +layout(set = 0, binding = 2) uniform texture3D light_cascades[MAX_CASCADES]; +layout(set = 0, binding = 3) uniform texture3D aniso0_cascades[MAX_CASCADES]; +layout(set = 0, binding = 4) uniform texture3D aniso1_cascades[MAX_CASCADES]; +layout(set = 0, binding = 5) uniform texture3D occlusion_texture; + +layout(set = 0, binding = 8) uniform sampler linear_sampler; + +struct CascadeData { + vec3 offset; //offset of (0,0,0) in world coordinates + float to_cell; // 1/bounds * grid_size + ivec3 probe_world_offset; + uint pad; +}; + +layout(set = 0, binding = 9, std140) uniform Cascades { + CascadeData data[MAX_CASCADES]; +} +cascades; + +layout(rgba16f, set = 0, binding = 10) uniform restrict writeonly image2D screen_buffer; + +layout(set = 0, binding = 11) uniform texture2DArray lightprobe_texture; + +layout(push_constant, std430) uniform Params { + vec3 grid_size; + uint max_cascades; + + ivec2 screen_size; + bool use_occlusion; + float y_mult; + + int probe_axis_size; + float z_near; + float reserved1; + float reserved2; + + mat4 cam_transform; + mat4 inv_projection; +} +params; + +vec3 linear_to_srgb(vec3 color) { + //if going to srgb, clamp from 0 to 1. + color = clamp(color, vec3(0.0), vec3(1.0)); + const vec3 a = vec3(0.055f); + return mix((vec3(1.0f) + a) * pow(color.rgb, vec3(1.0f / 2.4f)) - a, 12.92f * color.rgb, lessThan(color.rgb, vec3(0.0031308f))); +} + +vec2 octahedron_wrap(vec2 v) { + vec2 signVal; + signVal.x = v.x >= 0.0 ? 1.0 : -1.0; + signVal.y = v.y >= 0.0 ? 1.0 : -1.0; + return (1.0 - abs(v.yx)) * signVal; +} + +vec2 octahedron_encode(vec3 n) { + // https://twitter.com/Stubbesaurus/status/937994790553227264 + n /= (abs(n.x) + abs(n.y) + abs(n.z)); + n.xy = n.z >= 0.0 ? n.xy : octahedron_wrap(n.xy); + n.xy = n.xy * 0.5 + 0.5; + return n.xy; +} + +void main() { + // Pixel being shaded + ivec2 screen_pos = ivec2(gl_GlobalInvocationID.xy); + if (any(greaterThanEqual(screen_pos, params.screen_size))) { //too large, do nothing + return; + } + + vec3 ray_pos; + vec3 ray_dir; + { + ray_pos = params.cam_transform[3].xyz; + + ray_dir.xy = ((vec2(screen_pos) / vec2(params.screen_size)) * 2.0 - 1.0); + ray_dir.z = params.z_near; + ray_dir = (params.inv_projection * vec4(ray_dir, 1.0)).xyz; + + ray_dir = normalize(mat3(params.cam_transform) * ray_dir); + } + + ray_pos.y *= params.y_mult; + ray_dir.y *= params.y_mult; + ray_dir = normalize(ray_dir); + + vec3 pos_to_uvw = 1.0 / params.grid_size; + + vec3 light = vec3(0.0); + float blend = 0.0; + +#if 1 + // No interpolation + + vec3 inv_dir = 1.0 / ray_dir; + + float rough = 0.5; + bool hit = false; + + for (uint i = 0; i < params.max_cascades; i++) { + //convert to local bounds + vec3 pos = ray_pos - cascades.data[i].offset; + pos *= cascades.data[i].to_cell; + + // Should never happen for debug, since we start mostly at the bounds center, + // but add anyway. + //if (any(lessThan(pos,vec3(0.0))) || any(greaterThanEqual(pos,params.grid_size))) { + // continue; //already past bounds for this cascade, goto next + //} + + //find maximum advance distance (until reaching bounds) + vec3 t0 = -pos * inv_dir; + vec3 t1 = (params.grid_size - pos) * inv_dir; + vec3 tmax = max(t0, t1); + float max_advance = min(tmax.x, min(tmax.y, tmax.z)); + + float advance = 0.0; + vec3 uvw; + hit = false; + + while (advance < max_advance) { + //read how much to advance from SDF + uvw = (pos + ray_dir * advance) * pos_to_uvw; + + float distance = texture(sampler3D(sdf_cascades[i], linear_sampler), uvw).r * 255.0 - 1.7; + + if (distance < 0.001) { + //consider hit + hit = true; + break; + } + + advance += distance; + } + + if (!hit) { + pos += ray_dir * min(advance, max_advance); + pos /= cascades.data[i].to_cell; + pos += cascades.data[i].offset; + ray_pos = pos; + continue; + } + + //compute albedo, emission and normal at hit point + + const float EPSILON = 0.001; + vec3 hit_normal = normalize(vec3( + texture(sampler3D(sdf_cascades[i], linear_sampler), uvw + vec3(EPSILON, 0.0, 0.0)).r - texture(sampler3D(sdf_cascades[i], linear_sampler), uvw - vec3(EPSILON, 0.0, 0.0)).r, + texture(sampler3D(sdf_cascades[i], linear_sampler), uvw + vec3(0.0, EPSILON, 0.0)).r - texture(sampler3D(sdf_cascades[i], linear_sampler), uvw - vec3(0.0, EPSILON, 0.0)).r, + texture(sampler3D(sdf_cascades[i], linear_sampler), uvw + vec3(0.0, 0.0, EPSILON)).r - texture(sampler3D(sdf_cascades[i], linear_sampler), uvw - vec3(0.0, 0.0, EPSILON)).r)); + + vec3 hit_light = texture(sampler3D(light_cascades[i], linear_sampler), uvw).rgb; + vec4 aniso0 = texture(sampler3D(aniso0_cascades[i], linear_sampler), uvw); + vec3 hit_aniso0 = aniso0.rgb; + vec3 hit_aniso1 = vec3(aniso0.a, texture(sampler3D(aniso1_cascades[i], linear_sampler), uvw).rg); + + hit_light *= (dot(max(vec3(0.0), (hit_normal * hit_aniso0)), vec3(1.0)) + dot(max(vec3(0.0), (-hit_normal * hit_aniso1)), vec3(1.0))); + + light = hit_light; + + break; + } + +#endif + + imageStore(screen_buffer, screen_pos, vec4(linear_to_srgb(light), 1.0)); +} |