diff options
Diffstat (limited to 'intermediate/surface.glsl')
| -rw-r--r-- | intermediate/surface.glsl | 68 |
1 files changed, 67 insertions, 1 deletions
diff --git a/intermediate/surface.glsl b/intermediate/surface.glsl index 9fc1c48..10944ae 100644 --- a/intermediate/surface.glsl +++ b/intermediate/surface.glsl @@ -74,6 +74,15 @@ type: float [variable] name: colour type: vec3 +[variable] +name: caster_id +type: int + +[struct] +name: Caster +[variable] +name: projection +type: mat4 [cbuffer] name: c_vp @@ -95,6 +104,11 @@ name: lights type: Light stage: fragment +[sbuffer] +name: casters +type: Caster +stage: fragment + [texture] name: albedo stage: fragment @@ -119,6 +133,10 @@ dimension: 2 name: env_cube stage: fragment dimension: cube +[texture] +name: shadowmaps +stage: fragment +dimension: shadowArray [target] name: colour @@ -174,6 +192,51 @@ float specular_brdf(vec2 uv, vec3 ref, vec3 l, vec3 v, vec3 n) { return (D * F * G) / (4.0 * ndl * ndv + 0.001); } +vec2 poissonDisk[16] = vec2[]( + vec2(-0.94201624, -0.39906216), + vec2(0.94558609, -0.76890725), + vec2(-0.094184101, -0.92938870), + vec2(0.34495938, 0.29387760), + vec2(-0.91588581, 0.45771432), + vec2(-0.81544232, -0.87912464), + vec2(-0.38277543, 0.27676845), + vec2(0.97484398, 0.75648379), + vec2(0.44323325, -0.97511554), + vec2(0.53742981, -0.47373420), + vec2(-0.26496911, -0.41893023), + vec2(0.79197514, 0.19090188), + vec2(-0.24188840, 0.99706507), + vec2(-0.81409955, 0.91437590), + vec2(0.19984126, 0.78641367), + vec2(0.14383161, -0.14100790) +); + +float random(vec3 seed, int i){ + vec4 seed4 = vec4(seed,i); + float dot_product = dot(seed4, vec4(12.9898,78.233,45.164,94.673)); + return fract(sin(dot_product) * 43758.5453); +} + +float get_shadow(Light l, vec3 wpos) { + const int taps = 4; + const float w = 1.0 / float(taps); + const float m = 1.0 / 1000.0; + int i; + float d = 0.0f; + Caster caster = casters[l.caster_id]; + vec4 surf = caster.projection * vec4(wpos, 1.0); + surf /= surf.w; + surf.xy = surf.xy * 0.5 + 0.5; + surf.z -= 0.005; + for (i = 0; i < taps; i++) { + int index = int(16.0 * random(floor(wpos.xyz * 1000.0), i)) % 16; + vec2 coord = surf.xy + poissonDisk[index] * m; + vec4 vec = vec4(coord, float(l.caster_id), surf.z); + d += texture(shadowmaps, vec).r * w; + } + return d; +} + void main() { int i; vec2 uv = interpolator.uv; @@ -210,7 +273,10 @@ void main() { spec_col * specular_brdf(uv, ref, light_dir, view_dir, nrm) * cos_theta_i; - light += (diffuse + spec) * l.brightness * l.colour; + float shadow = 1.0f; + if (l.caster_id >= 0) + shadow = get_shadow(l, p); + light += (diffuse + spec) * l.brightness * l.colour * shadow; } colour = vec4(ambient + light, 1.0); |