Commit: 5f569378d2d8c3a9f923afb5b94e68862926922d
Author: Clément Foucault
Date: Tue Jan 16 14:03:31 2018 +0100
Branches: blender2.8
https://developer.blender.org/rB5f569378d2d8c3a9f923afb5b94e68862926922d
Eevee: SSR: Derive the brdf bias from the trace quality.
Also change the range of the trace quality so that the trace actually covers
the screen most of the time.
===================================================================
M source/blender/draw/engines/eevee/eevee_private.h
M source/blender/draw/engines/eevee/eevee_screen_raytrace.c
M source/blender/draw/engines/eevee/shaders/effect_ssr_frag.glsl
===================================================================
diff --git a/source/blender/draw/engines/eevee/eevee_private.h
b/source/blender/draw/engines/eevee/eevee_private.h
index e0468687c6e..85878a6acc3 100644
--- a/source/blender/draw/engines/eevee/eevee_private.h
+++ b/source/blender/draw/engines/eevee/eevee_private.h
@@ -499,6 +499,7 @@ typedef struct EEVEE_EffectsInfo {
bool ssr_use_normalization;
int ssr_neighbor_ofs;
int ssr_halfres_ofs[2];
+ float ssr_brdf_bias;
float ssr_firefly_fac;
float ssr_border_fac;
float ssr_max_roughness;
diff --git a/source/blender/draw/engines/eevee/eevee_screen_raytrace.c
b/source/blender/draw/engines/eevee/eevee_screen_raytrace.c
index d704668ea79..62f75800e14 100644
--- a/source/blender/draw/engines/eevee/eevee_screen_raytrace.c
+++ b/source/blender/draw/engines/eevee/eevee_screen_raytrace.c
@@ -126,11 +126,12 @@ int EEVEE_screen_raytrace_init(EEVEE_ViewLayerData
*UNUSED(sldata), EEVEE_Data *
bool prev_trace_full = effects->reflection_trace_full;
effects->reflection_trace_full =
!BKE_collection_engine_property_value_get_bool(props, "ssr_halfres");
effects->ssr_use_normalization =
BKE_collection_engine_property_value_get_bool(props, "ssr_normalize_weight");
- effects->ssr_quality = 1.0f -
BKE_collection_engine_property_value_get_float(props, "ssr_quality");
+ effects->ssr_quality = 1.0f - 0.95f *
BKE_collection_engine_property_value_get_float(props, "ssr_quality");
effects->ssr_thickness =
BKE_collection_engine_property_value_get_float(props, "ssr_thickness");
effects->ssr_border_fac =
BKE_collection_engine_property_value_get_float(props, "ssr_border_fade");
effects->ssr_firefly_fac =
BKE_collection_engine_property_value_get_float(props, "ssr_firefly_fac");
effects->ssr_max_roughness =
BKE_collection_engine_property_value_get_float(props, "ssr_max_roughness");
+ effects->ssr_brdf_bias = 0.1f + effects->ssr_quality * 0.6f; /*
Range [0.1, 0.7]. */
if (effects->ssr_firefly_fac < 1e-8f) {
effects->ssr_firefly_fac = FLT_MAX;
@@ -221,6 +222,7 @@ void EEVEE_screen_raytrace_cache_init(EEVEE_ViewLayerData
*sldata, EEVEE_Data *v
DRW_shgroup_uniform_vec4(grp, "ssrParameters",
&effects->ssr_quality, 1);
DRW_shgroup_uniform_int(grp, "planar_count",
&sldata->probes->num_planar, 1);
DRW_shgroup_uniform_float(grp, "maxRoughness",
&effects->ssr_max_roughness, 1);
+ DRW_shgroup_uniform_float(grp, "brdfBias",
&effects->ssr_brdf_bias, 1);
DRW_shgroup_uniform_buffer(grp, "planarDepth",
&vedata->txl->planar_depth);
DRW_shgroup_uniform_block(grp, "planar_block",
sldata->planar_ubo);
if (!effects->reflection_trace_full) {
@@ -245,6 +247,7 @@ void EEVEE_screen_raytrace_cache_init(EEVEE_ViewLayerData
*sldata, EEVEE_Data *v
DRW_shgroup_uniform_float(grp, "lodCubeMax",
&sldata->probes->lod_cube_max, 1);
DRW_shgroup_uniform_float(grp, "lodPlanarMax",
&sldata->probes->lod_planar_max, 1);
DRW_shgroup_uniform_float(grp, "fireflyFactor",
&effects->ssr_firefly_fac, 1);
+ DRW_shgroup_uniform_float(grp, "brdfBias",
&effects->ssr_brdf_bias, 1);
DRW_shgroup_uniform_block(grp, "probe_block",
sldata->probe_ubo);
DRW_shgroup_uniform_block(grp, "planar_block",
sldata->planar_ubo);
DRW_shgroup_uniform_buffer(grp, "probeCubes",
&sldata->probe_pool);
diff --git a/source/blender/draw/engines/eevee/shaders/effect_ssr_frag.glsl
b/source/blender/draw/engines/eevee/shaders/effect_ssr_frag.glsl
index d615baba161..02911c5793c 100644
--- a/source/blender/draw/engines/eevee/shaders/effect_ssr_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/effect_ssr_frag.glsl
@@ -7,9 +7,9 @@
uniform sampler2DArray utilTex;
#endif /* UTIL_TEX */
-#define BRDF_BIAS 0.7
#define MAX_MIP 9.0
+uniform float brdfBias;
uniform float fireflyFactor;
uniform float maxRoughness;
uniform ivec2 halfresOffset;
@@ -42,13 +42,9 @@ layout(location = 1) out float pdfData;
void do_planar_ssr(int index, vec3 V, vec3 N, vec3 T, vec3 B, vec3
planeNormal, vec3 viewPosition, float a2, vec4 rand)
{
- float pdf, NH;
-
- /* Importance sampling bias */
- rand.x = mix(rand.x, 0.0, BRDF_BIAS);
-
+ float NH;
vec3 H = sample_ggx(rand.xzw, a2, N, T, B, NH); /* Microfacet normal */
- pdf = pdf_ggx_reflect(NH, a2);
+ float pdf = pdf_ggx_reflect(NH, a2);
vec3 R = reflect(-V, H);
R = reflect(R, planeNormal);
@@ -76,13 +72,9 @@ void do_planar_ssr(int index, vec3 V, vec3 N, vec3 T, vec3
B, vec3 planeNormal,
void do_ssr(vec3 V, vec3 N, vec3 T, vec3 B, vec3 viewPosition, float a2, vec4
rand)
{
- float pdf, NH;
-
- /* Importance sampling bias */
- rand.x = mix(rand.x, 0.0, BRDF_BIAS);
-
+ float NH;
vec3 H = sample_ggx(rand.xzw, a2, N, T, B, NH); /* Microfacet normal */
- pdf = pdf_ggx_reflect(NH, a2);
+ float pdf = pdf_ggx_reflect(NH, a2);
vec3 R = reflect(-V, H);
pdfData = min(1024e32, pdf); /* Theoretical limit of 16bit float */
@@ -138,6 +130,8 @@ void main()
if (roughness < 0.04) {
rand.xzw *= 0.0;
}
+ /* Importance sampling bias */
+ rand.x = mix(rand.x, 0.0, brdfBias);
vec3 worldPosition = transform_point(ViewMatrixInverse, viewPosition);
vec3 wN = transform_direction(ViewMatrixInverse, N);
@@ -363,7 +357,7 @@ vec4 get_ssr_samples(
/* Compute cone footprint in screen space. */
vec4 cone_footprint = hit_dist * cone_tan;
- cone_footprint = BRDF_BIAS * 0.5 * cone_footprint *
max(ProjectionMatrix[0][0], ProjectionMatrix[1][1]) / homcoord;
+ cone_footprint = brdfBias * 0.5 * cone_footprint *
max(ProjectionMatrix[0][0], ProjectionMatrix[1][1]) / homcoord;
/* Estimate a cone footprint to sample a corresponding mipmap level. */
vec4 mip = log2(cone_footprint * max_v2(vec2(textureSize(depthBuffer,
0))));
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