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Eevee: fix some glsl for low quality lamps.

This commit is contained in:
Clément Foucault 2017-05-15 16:13:39 +02:00
parent e053fade99
commit c28a4eb8cb
4 changed files with 18 additions and 16 deletions
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12
source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
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@ -5,6 +5,8 @@
#define M_1_2PI 0.159154943091895335768 /* 1/(2*pi) */
#define M_1_PI2 0.101321183642337771443 /* 1/(pi^2) */
#define LUT_SIZE 64
/* ------- Structures -------- */
struct LightData {
@ -127,6 +129,16 @@ vec3 line_aligned_plane_intersect(vec3 lineorigin, vec3 linedirection, vec3 plan
return lineorigin + linedirection * dist;
}
/* Return texture coordinates to sample Surface LUT */
vec2 lut_coords(float cosTheta, float roughness)
{
float theta = acos(cosTheta);
vec2 coords = vec2(roughness, theta / M_PI_2);
/* scale and bias coordinates, for correct filtered lookup */
return coords * (LUT_SIZE - 1.0) / LUT_SIZE + 0.5 / LUT_SIZE;
}
/* -- Tangent Space conversion -- */
vec3 tangent_to_world(vec3 vector, vec3 N, vec3 T, vec3 B)
{

10
source/blender/draw/engines/eevee/shaders/bsdf_direct_lib.glsl
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@ -96,13 +96,13 @@ vec3 direct_ggx_point(ShadingData sd, float roughness, vec3 f0)
vec3 direct_ggx_sphere(LightData ld, ShadingData sd, float roughness, vec3 f0)
{
#ifdef USE_LTC
float NV = max(dot(sd.N, sd.V), 1e-8);
vec3 P = line_aligned_plane_intersect(vec3(0.0), sd.spec_dominant_dir, sd.l_vector);
vec3 Px = normalize(P - sd.l_vector) * ld.l_radius;
vec3 Py = cross(Px, sd.L);
float NV = max(dot(sd.N, sd.V), 1e-8);
vec2 uv = ltc_coords(NV, sqrt(roughness));
vec2 uv = lut_coords(NV, sqrt(roughness));
mat3 ltcmat = ltc_matrix(uv);
// #define HIGHEST_QUALITY
@ -148,7 +148,7 @@ vec3 direct_ggx_sphere(LightData ld, ShadingData sd, float roughness, vec3 f0)
/* Fresnel */
float VH = max(dot(sd.V, normalize(sd.V + sd.L)), 0.0);
vec3 spec = F_schlick(f0, NV) * bsdf;
vec3 spec = F_schlick(f0, VH) * bsdf;
#endif
return spec;
}
@ -157,7 +157,7 @@ vec3 direct_ggx_rectangle(LightData ld, ShadingData sd, float roughness, vec3 f0
{
#ifdef USE_LTC
float NV = max(dot(sd.N, sd.V), 1e-8);
vec2 uv = ltc_coords(NV, sqrt(roughness));
vec2 uv = lut_coords(NV, sqrt(roughness));
mat3 ltcmat = ltc_matrix(uv);
float bsdf = ltc_evaluate(sd.N, sd.V, ltcmat, sd.area_data.corner);
@ -180,7 +180,7 @@ vec3 direct_ggx_rectangle(LightData ld, ShadingData sd, float roughness, vec3 f0
/* Fresnel */
float VH = max(dot(sd.V, normalize(sd.V + sd.L)), 0.0);
vec3 spec = F_schlick(f0, NV) * bsdf;
vec3 spec = F_schlick(f0, VH) * bsdf;
#endif
return spec;
}

2
source/blender/draw/engines/eevee/shaders/lit_surface_frag.glsl
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@ -264,7 +264,7 @@ vec3 eevee_surface_lit(vec3 world_normal, vec3 albedo, vec3 f0, float roughness,
}
/* Envmaps */
vec2 uv = ltc_coords(dot(sd.N, sd.V), sqrt(roughness));
vec2 uv = lut_coords(dot(sd.N, sd.V), sqrt(roughness));
vec2 brdf_lut = texture(brdfLut, uv).rg;
vec3 Li = textureLod(probeFiltered, sd.spec_dominant_dir, roughness * lodMax).rgb;
indirect_radiance += Li * brdf_lut.y + f0 * Li * brdf_lut.x;

10
source/blender/draw/engines/eevee/shaders/ltc_lib.glsl
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@ -1,7 +1,6 @@
/* Mainly From https://eheitzresearch.wordpress.com/415-2/ */
#define USE_LTC
#define LTC_LUT_SIZE 64
uniform sampler2D ltcMat;
uniform sampler2D brdfLut;
@ -146,15 +145,6 @@ int clip_quad_to_horizon(inout vec3 L[5])
return n;
}
vec2 ltc_coords(float cosTheta, float roughness)
{
float theta = acos(cosTheta);
vec2 coords = vec2(roughness, theta/(0.5*3.14159));
/* scale and bias coordinates, for correct filtered lookup */
return coords * (LTC_LUT_SIZE - 1.0) / LTC_LUT_SIZE + 0.5 / LTC_LUT_SIZE;
}
mat3 ltc_matrix(vec2 coord)
{
/* load inverse matrix */