diff options
Diffstat (limited to 'source/blender/draw/engines/eevee/shaders/ssr_lib.glsl')
| -rw-r--r-- | source/blender/draw/engines/eevee/shaders/ssr_lib.glsl | 99 |
1 files changed, 51 insertions, 48 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/ssr_lib.glsl b/source/blender/draw/engines/eevee/shaders/ssr_lib.glsl index 6c7bfeb6b82..0591b247541 100644 --- a/source/blender/draw/engines/eevee/shaders/ssr_lib.glsl +++ b/source/blender/draw/engines/eevee/shaders/ssr_lib.glsl @@ -2,71 +2,74 @@ #define BTDF_BIAS 0.85 -vec4 screen_space_refraction(vec3 viewPosition, vec3 N, vec3 V, float ior, float roughnessSquared, vec4 rand) +vec4 screen_space_refraction( + vec3 viewPosition, vec3 N, vec3 V, float ior, float roughnessSquared, vec4 rand) { - float a2 = max(5e-6, roughnessSquared * roughnessSquared); + float a2 = max(5e-6, roughnessSquared * roughnessSquared); - /* Importance sampling bias */ - rand.x = mix(rand.x, 0.0, BTDF_BIAS); + /* Importance sampling bias */ + rand.x = mix(rand.x, 0.0, BTDF_BIAS); - vec3 T, B; - float NH; - make_orthonormal_basis(N, T, B); - vec3 H = sample_ggx(rand.xzw, a2, N, T, B, NH); /* Microfacet normal */ - float pdf = pdf_ggx_reflect(NH, a2); + vec3 T, B; + float NH; + make_orthonormal_basis(N, T, B); + vec3 H = sample_ggx(rand.xzw, a2, N, T, B, NH); /* Microfacet normal */ + float pdf = pdf_ggx_reflect(NH, a2); - /* If ray is bad (i.e. going below the plane) regenerate. */ - if (F_eta(ior, dot(H, V)) < 1.0) { - H = sample_ggx(rand.xzw * vec3(1.0, -1.0, -1.0), a2, N, T, B, NH); /* Microfacet normal */ - pdf = pdf_ggx_reflect(NH, a2); - } + /* If ray is bad (i.e. going below the plane) regenerate. */ + if (F_eta(ior, dot(H, V)) < 1.0) { + H = sample_ggx(rand.xzw * vec3(1.0, -1.0, -1.0), a2, N, T, B, NH); /* Microfacet normal */ + pdf = pdf_ggx_reflect(NH, a2); + } - vec3 vV = viewCameraVec; - float eta = 1.0/ior; - if (dot(H, V) < 0.0) { - H = -H; - eta = ior; - } + vec3 vV = viewCameraVec; + float eta = 1.0 / ior; + if (dot(H, V) < 0.0) { + H = -H; + eta = ior; + } - vec3 R = refract(-V, H, 1.0 / ior); + vec3 R = refract(-V, H, 1.0 / ior); - R = transform_direction(ViewMatrix, R); + R = transform_direction(ViewMatrix, R); - vec3 hit_pos = raycast(-1, viewPosition, R * 1e16, ssrThickness, rand.y, ssrQuality, roughnessSquared, false); + vec3 hit_pos = raycast( + -1, viewPosition, R * 1e16, ssrThickness, rand.y, ssrQuality, roughnessSquared, false); - if ((hit_pos.z > 0.0) && (F_eta(ior, dot(H, V)) < 1.0)) { - hit_pos = get_view_space_from_depth(hit_pos.xy, hit_pos.z); - float hit_dist = distance(hit_pos, viewPosition); + if ((hit_pos.z > 0.0) && (F_eta(ior, dot(H, V)) < 1.0)) { + hit_pos = get_view_space_from_depth(hit_pos.xy, hit_pos.z); + float hit_dist = distance(hit_pos, viewPosition); - float cone_cos = cone_cosine(roughnessSquared); - float cone_tan = sqrt(1 - cone_cos * cone_cos) / cone_cos; + float cone_cos = cone_cosine(roughnessSquared); + float cone_tan = sqrt(1 - cone_cos * cone_cos) / cone_cos; - /* Empirical fit for refraction. */ - /* TODO find a better fit or precompute inside the LUT. */ - cone_tan *= 0.5 * fast_sqrt(f0_from_ior((ior < 1.0) ? 1.0 / ior : ior)); + /* Empirical fit for refraction. */ + /* TODO find a better fit or precompute inside the LUT. */ + cone_tan *= 0.5 * fast_sqrt(f0_from_ior((ior < 1.0) ? 1.0 / ior : ior)); - float cone_footprint = hit_dist * cone_tan; + float cone_footprint = hit_dist * cone_tan; - /* find the offset in screen space by multiplying a point - * in camera space at the depth of the point by the projection matrix. */ - float homcoord = ProjectionMatrix[2][3] * hit_pos.z + ProjectionMatrix[3][3]; - /* UV space footprint */ - cone_footprint = BTDF_BIAS * 0.5 * max(ProjectionMatrix[0][0], ProjectionMatrix[1][1]) * cone_footprint / homcoord; + /* find the offset in screen space by multiplying a point + * in camera space at the depth of the point by the projection matrix. */ + float homcoord = ProjectionMatrix[2][3] * hit_pos.z + ProjectionMatrix[3][3]; + /* UV space footprint */ + cone_footprint = BTDF_BIAS * 0.5 * max(ProjectionMatrix[0][0], ProjectionMatrix[1][1]) * + cone_footprint / homcoord; - vec2 hit_uvs = project_point(ProjectionMatrix, hit_pos).xy * 0.5 + 0.5; + vec2 hit_uvs = project_point(ProjectionMatrix, hit_pos).xy * 0.5 + 0.5; - /* Texel footprint */ - vec2 texture_size = vec2(textureSize(colorBuffer, 0).xy); - float mip = clamp(log2(cone_footprint * max(texture_size.x, texture_size.y)), 0.0, 9.0); + /* Texel footprint */ + vec2 texture_size = vec2(textureSize(colorBuffer, 0).xy); + float mip = clamp(log2(cone_footprint * max(texture_size.x, texture_size.y)), 0.0, 9.0); - /* Correct UVs for mipmaping mis-alignment */ - hit_uvs *= mip_ratio_interp(mip); + /* Correct UVs for mipmaping mis-alignment */ + hit_uvs *= mip_ratio_interp(mip); - vec3 spec = textureLod(colorBuffer, hit_uvs, mip).xyz; - float mask = screen_border_mask(hit_uvs); + vec3 spec = textureLod(colorBuffer, hit_uvs, mip).xyz; + float mask = screen_border_mask(hit_uvs); - return vec4(spec, mask); - } + return vec4(spec, mask); + } - return vec4(0.0); + return vec4(0.0); } |