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Eevee: SSR: Use noise to dither the stride banding.

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This commit is contained in:
Clément Foucault
2017-07-22 00:22:39 +02:00
parent a3732412ad
commit 9906ef06b1
2 changed files with 10 additions and 7 deletions
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12
source/blender/draw/engines/eevee/shaders/effect_ssr_frag.glsl
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@@ -6,12 +6,11 @@ uniform sampler2DArray utilTex;
#define BRDF_BIAS 0.7
vec3 generate_ray(ivec2 pix, vec3 V, vec3 N, float a2, out float pdf)
vec3 generate_ray(vec3 V, vec3 N, float a2, vec3 rand, out float pdf)
{
float NH;
vec3 T, B;
make_orthonormal_basis(N, T, B); /* Generate tangent space */
vec3 rand = texelFetch(utilTex, ivec3(pix % LUT_SIZE, 2), 0).rba;
/* Importance sampling bias */
rand.x = mix(rand.x, 0.0, BRDF_BIAS);
@@ -66,7 +65,8 @@ void main()
/* Generate Ray */
float pdf;
vec3 R = generate_ray(halfres_texel, V, N, a2, pdf);
vec3 rand = texelFetch(utilTex, ivec3(halfres_texel % LUT_SIZE, 2), 0).rba;
vec3 R = generate_ray(V, N, a2, rand, pdf);
/* Search for the planar reflection affecting this pixel */
/* If no planar is found, fallback to screen space */
@@ -88,7 +88,7 @@ void main()
/* Note : this still fails in some cases like with normal map.
* We should check against the geometric normal but we don't have it at this stage. */
if (dot(R, N) > 0.0001) {
hit_dist = raycast(depthBuffer, viewPosition, R);
hit_dist = raycast(depthBuffer, viewPosition, R, rand.x);
}
vec2 hit_co = project_point(ProjectionMatrix, viewPosition + R * hit_dist).xy * 0.5 + 0.5;
@@ -192,8 +192,8 @@ float screen_border_mask(vec2 past_hit_co, vec3 hit)
hit_co.xy = (hit_co.xy / hit_co.w) * 0.5 + 0.5;
hit_co.zw = past_hit_co;
const float margin = -0.02;
const float atten = 0.02 + margin; /* Screen percentage */
const float margin = 0.01;
const float atten = 0.075 + margin; /* Screen percentage */
hit_co = smoothstep(margin, atten, hit_co) * (1 - smoothstep(1.0 - atten, 1.0 - margin, hit_co));
vec2 atten_fac = min(hit_co.xy, hit_co.zw);

5
source/blender/draw/engines/eevee/shaders/raytrace_lib.glsl
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@@ -22,7 +22,7 @@ void swapIfBigger(inout float a, inout float b)
}
/* Return the length of the ray if there is a hit, and -1.0 if not hit occured */
float raycast(sampler2D depth_texture, vec3 ray_origin, vec3 ray_dir)
float raycast(sampler2D depth_texture, vec3 ray_origin, vec3 ray_dir, float ray_jitter)
{
float near = get_view_z_from_depth(0.0); /* TODO optimize */
@@ -95,6 +95,9 @@ float raycast(sampler2D depth_texture, vec3 ray_origin, vec3 ray_dir)
* the step direction for a signed comparison */
float end = P1.x * step_sign;
/* Initial offset */
pqk += dPQK * ray_jitter;
bool hit = false;
float raw_depth;
for (float hitstep = 0.0; hitstep < MAX_STEP && !hit; hitstep++) {