diff options
author | Campbell Barton <ideasman42@gmail.com> | 2017-10-09 12:49:27 +0300 |
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committer | Campbell Barton <ideasman42@gmail.com> | 2017-10-09 12:49:27 +0300 |
commit | a5b4b0f21c1ae8c96e4fea9abdcfac2fab1cf300 (patch) | |
tree | 0658d8bdfb8ec03652aa04f82ee8a4d243ec6370 /source/blender/draw/engines/eevee/shaders/lamps_lib.glsl | |
parent | d68f698cf0321477c0734474150eb4bc43c4e85f (diff) | |
parent | abcda06934aba054de8540b66b13c2bbc5f8f515 (diff) |
Merge branch '28' into custom-manipulatorscustom-manipulators
Diffstat (limited to 'source/blender/draw/engines/eevee/shaders/lamps_lib.glsl')
-rw-r--r-- | source/blender/draw/engines/eevee/shaders/lamps_lib.glsl | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/lamps_lib.glsl b/source/blender/draw/engines/eevee/shaders/lamps_lib.glsl new file mode 100644 index 00000000000..c879e9c37f3 --- /dev/null +++ b/source/blender/draw/engines/eevee/shaders/lamps_lib.glsl @@ -0,0 +1,301 @@ + +uniform sampler2DArray shadowTexture; + +layout(std140) uniform shadow_block { + ShadowData shadows_data[MAX_SHADOW]; + ShadowCubeData shadows_cube_data[MAX_SHADOW_CUBE]; + ShadowCascadeData shadows_cascade_data[MAX_SHADOW_CASCADE]; +}; + +layout(std140) uniform light_block { + LightData lights_data[MAX_LIGHT]; +}; + +/* type */ +#define POINT 0.0 +#define SUN 1.0 +#define SPOT 2.0 +#define HEMI 3.0 +#define AREA 4.0 + +/* ----------------------------------------------------------- */ +/* ----------------------- Shadow tests ---------------------- */ +/* ----------------------------------------------------------- */ + +float shadow_test_esm(float z, float dist, float exponent) +{ + return saturate(exp(exponent * (z - dist))); +} + +float shadow_test_pcf(float z, float dist) +{ + return step(0, z - dist); +} + +float shadow_test_vsm(vec2 moments, float dist, float bias, float bleed_bias) +{ + float p = 0.0; + + if (dist <= moments.x) + p = 1.0; + + float variance = moments.y - (moments.x * moments.x); + variance = max(variance, bias / 10.0); + + float d = moments.x - dist; + float p_max = variance / (variance + d * d); + + /* Now reduce light-bleeding by removing the [0, x] tail and linearly rescaling (x, 1] */ + p_max = clamp((p_max - bleed_bias) / (1.0 - bleed_bias), 0.0, 1.0); + + return max(p, p_max); +} + + +/* ----------------------------------------------------------- */ +/* ----------------------- Shadow types ---------------------- */ +/* ----------------------------------------------------------- */ + +float shadow_cubemap(ShadowData sd, ShadowCubeData scd, float texid, vec3 W) +{ + vec3 cubevec = W - scd.position.xyz; + float dist = length(cubevec); + + /* If fragment is out of shadowmap range, do not occlude */ + /* XXX : we check radial distance against a cubeface distance. + * We loose quite a bit of valid area. */ + if (dist > sd.sh_far) + return 1.0; + + cubevec /= dist; + +#if defined(SHADOW_VSM) + vec2 moments = texture_octahedron(shadowTexture, vec4(cubevec, texid)).rg; +#else + float z = texture_octahedron(shadowTexture, vec4(cubevec, texid)).r; +#endif + +#if defined(SHADOW_VSM) + return shadow_test_vsm(moments, dist, sd.sh_bias, sd.sh_bleed); +#elif defined(SHADOW_ESM) + return shadow_test_esm(z, dist - sd.sh_bias, sd.sh_exp); +#else + return shadow_test_pcf(z, dist - sd.sh_bias); +#endif +} + +float evaluate_cascade(ShadowData sd, mat4 shadowmat, vec3 W, float range, float texid) +{ + vec4 shpos = shadowmat * vec4(W, 1.0); + float dist = shpos.z * range; + +#if defined(SHADOW_VSM) + vec2 moments = texture(shadowTexture, vec3(shpos.xy, texid)).rg; +#else + float z = texture(shadowTexture, vec3(shpos.xy, texid)).r; +#endif + + float vis; +#if defined(SHADOW_VSM) + vis = shadow_test_vsm(moments, dist, sd.sh_bias, sd.sh_bleed); +#elif defined(SHADOW_ESM) + vis = shadow_test_esm(z, dist - sd.sh_bias, sd.sh_exp); +#else + vis = shadow_test_pcf(z, dist - sd.sh_bias); +#endif + + /* If fragment is out of shadowmap range, do not occlude */ + if (shpos.z < 1.0 && shpos.z > 0.0) { + return vis; + } + else { + return 1.0; + } +} + +float shadow_cascade(ShadowData sd, ShadowCascadeData scd, float texid, vec3 W) +{ + vec4 view_z = vec4(dot(W - cameraPos, cameraForward)); + vec4 weights = smoothstep(scd.split_end_distances, scd.split_start_distances.yzwx, view_z); + weights.yzw -= weights.xyz; + + vec4 vis = vec4(1.0); + float range = abs(sd.sh_far - sd.sh_near); /* Same factor as in get_cascade_world_distance(). */ + + /* Branching using (weights > 0.0) is reaally slooow on intel so avoid it for now. */ + vis.x = evaluate_cascade(sd, scd.shadowmat[0], W, range, texid + 0); + vis.y = evaluate_cascade(sd, scd.shadowmat[1], W, range, texid + 1); + vis.z = evaluate_cascade(sd, scd.shadowmat[2], W, range, texid + 2); + vis.w = evaluate_cascade(sd, scd.shadowmat[3], W, range, texid + 3); + + float weight_sum = dot(vec4(1.0), weights); + if (weight_sum > 0.9999) { + float vis_sum = dot(vec4(1.0), vis * weights); + return vis_sum / weight_sum; + } + else { + float vis_sum = dot(vec4(1.0), vis * step(0.001, weights)); + return mix(1.0, vis_sum, weight_sum); + } +} + +/* ----------------------------------------------------------- */ +/* --------------------- Light Functions --------------------- */ +/* ----------------------------------------------------------- */ +#define MAX_MULTI_SHADOW 4 + +float light_visibility(LightData ld, vec3 W, +#ifndef VOLUMETRICS + vec3 viewPosition, + vec3 viewNormal, +#endif + vec4 l_vector) +{ + float vis = 1.0; + + if (ld.l_type == SPOT) { + float z = dot(ld.l_forward, l_vector.xyz); + vec3 lL = l_vector.xyz / z; + float x = dot(ld.l_right, lL) / ld.l_sizex; + float y = dot(ld.l_up, lL) / ld.l_sizey; + + float ellipse = 1.0 / sqrt(1.0 + x * x + y * y); + + float spotmask = smoothstep(0.0, 1.0, (ellipse - ld.l_spot_size) / ld.l_spot_blend); + + vis *= spotmask; + vis *= step(0.0, -dot(l_vector.xyz, ld.l_forward)); + } + else if (ld.l_type == AREA) { + vis *= step(0.0, -dot(l_vector.xyz, ld.l_forward)); + } + +#if !defined(VOLUMETRICS) || defined(VOLUME_SHADOW) + /* shadowing */ + if (ld.l_shadowid >= 0.0) { + ShadowData data = shadows_data[int(ld.l_shadowid)]; + + if (ld.l_type == SUN) { + /* TODO : MSM */ + // for (int i = 0; i < MAX_MULTI_SHADOW; ++i) { + vis *= shadow_cascade( + data, shadows_cascade_data[int(data.sh_data_start)], + data.sh_tex_start, W); + // } + } + else { + /* TODO : MSM */ + // for (int i = 0; i < MAX_MULTI_SHADOW; ++i) { + vis *= shadow_cubemap( + data, shadows_cube_data[int(data.sh_data_start)], + data.sh_tex_start, W); + // } + } + +#ifndef VOLUMETRICS + /* Only compute if not already in shadow. */ + if ((vis > 0.001) && (data.sh_contact_dist > 0.0)) { + vec4 L = (ld.l_type != SUN) ? l_vector : vec4(-ld.l_forward, 1.0); + float trace_distance = (ld.l_type != SUN) ? min(data.sh_contact_dist, l_vector.w) : data.sh_contact_dist; + + vec3 T, B; + make_orthonormal_basis(L.xyz / L.w, T, B); + + vec3 rand = texture(utilTex, vec3(gl_FragCoord.xy / LUT_SIZE, 2.0)).xzw; + rand.yz *= rand.x * data.sh_contact_spread; + + /* We use the full l_vector.xyz so that the spread is minimize + * if the shading point is further away from the light source */ + vec3 ray_dir = L.xyz + T * rand.y + B * rand.z; + ray_dir = transform_direction(ViewMatrix, ray_dir); + ray_dir = normalize(ray_dir); + vec3 ray_origin = viewPosition + viewNormal * data.sh_contact_offset; + vec3 hit_pos = raycast(-1, ray_origin, ray_dir * trace_distance, data.sh_contact_thickness, rand.x, 0.75, 0.01); + + if (hit_pos.z > 0.0) { + hit_pos = get_view_space_from_depth(hit_pos.xy, hit_pos.z); + float hit_dist = distance(viewPosition, hit_pos); + float dist_ratio = hit_dist / trace_distance; + return mix(0.0, vis, dist_ratio * dist_ratio * dist_ratio); + } + } +#endif + } +#endif + + return vis; +} + +float light_diffuse(LightData ld, vec3 N, vec3 V, vec4 l_vector) +{ +#ifdef USE_LTC + if (ld.l_type == SUN) { + /* TODO disk area light */ + return direct_diffuse_sun(ld, N); + } + else if (ld.l_type == AREA) { + return direct_diffuse_rectangle(ld, N, V, l_vector); + } + else { + return direct_diffuse_sphere(ld, N, l_vector); + } +#else + if (ld.l_type == SUN) { + return direct_diffuse_sun(ld, N, V); + } + else { + return direct_diffuse_point(N, l_vector); + } +#endif +} + +vec3 light_specular(LightData ld, vec3 N, vec3 V, vec4 l_vector, float roughness, vec3 f0) +{ +#ifdef USE_LTC + if (ld.l_type == SUN) { + /* TODO disk area light */ + return direct_ggx_sun(ld, N, V, roughness, f0); + } + else if (ld.l_type == AREA) { + return direct_ggx_rectangle(ld, N, V, l_vector, roughness, f0); + } + else { + return direct_ggx_sphere(ld, N, V, l_vector, roughness, f0); + } +#else + if (ld.l_type == SUN) { + return direct_ggx_sun(ld, N, V, roughness, f0); + } + else { + return direct_ggx_point(N, V, l_vector, roughness, f0); + } +#endif +} + +#ifdef HAIR_SHADER +void light_hair_common( + LightData ld, vec3 N, vec3 V, vec4 l_vector, vec3 norm_view, + out float occlu_trans, out float occlu, + out vec3 norm_lamp, out vec3 view_vec) +{ + const float transmission = 0.3; /* Uniform internal scattering factor */ + + vec3 lamp_vec; + + if (ld.l_type == SUN || ld.l_type == AREA) { + lamp_vec = ld.l_forward; + } + else { + lamp_vec = -l_vector.xyz; + } + + norm_lamp = cross(lamp_vec, N); + norm_lamp = normalize(cross(N, norm_lamp)); /* Normal facing lamp */ + + /* Rotate view vector onto the cross(tangent, light) plane */ + view_vec = normalize(norm_lamp * dot(norm_view, V) + N * dot(N, V)); + + occlu = (dot(norm_view, norm_lamp) * 0.5 + 0.5); + occlu_trans = transmission + (occlu * (1.0 - transmission)); /* Includes transmission component */ +} +#endif |