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75 lines
3.0 KiB
GLSL
75 lines
3.0 KiB
GLSL
// the environment map: the sky and the clouds around the camera (the reflection pass draws nothing else into it since the
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// screen space reflections took over the scenery), with its mipmaps and the levels prefiltered with the GGX lobe
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layout(set = PASS_SET, binding = ENV_TEX) uniform samplerCube envmap;
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// the same map prefiltered with the GGX lobe (envmap_prefilter.comp), used when env_ggx is 1
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layout(set = PASS_SET, binding = ENV_GGX_TEX) uniform samplerCube envmap_ggx;
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// the world space direction of the reflection of the view off a surface of the normal (view space)
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vec3 envmap_direction(vec3 normal)
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{
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vec3 refvec = reflect(f_pos.xyz, normal); // view space
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return vec3(inv_view * vec4(refvec, 0.0)); // world space
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}
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// the map in a world space direction, at a level of its mipmaps
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vec3 envmap_sample_lod(vec3 direction, float lod)
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{
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if (ENVMAP_ENABLED)
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{
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vec3 envcolor = textureLod(envmap, direction, lod).rgb;
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// Sanitize. The env cubemap can briefly contain NaN/Inf after a
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// reflection-pass regeneration (m_empty_cubemap was bound during the
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// face render and on NVIDIA can sample as undefined), and the mipmap
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// generation propagates a single NaN texel across the whole mip chain.
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// Without this guard a single bad texel produces one-frame black
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// flashes on glossy (esp. specgloss) surfaces.
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if (any(isnan(envcolor)) || any(isinf(envcolor))) envcolor = vec3(0.0);
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return max(envcolor, vec3(0.0));
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}
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else
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{
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return vec3(0.5);
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}
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}
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// the map in a world space direction for a surface of the given perceptual roughness (0 mirror, 1 matte)
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vec3 envmap_sample_rough(vec3 direction, float roughness)
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{
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// the plain map, its mipmaps (box filtered) standing for the roughness
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const float MAX_REFLECTION_LOD = 8.0;
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vec3 boxcolor = envmap_sample_lod(direction, roughness * MAX_REFLECTION_LOD);
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if (ENVMAP_ENABLED)
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{
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if (env_ggx == 0U || roughness <= ENVMAP_GGX_ROUGHNESS_MIN)
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return boxcolor;
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float level = (roughness - ENVMAP_GGX_ROUGHNESS_MIN) / (1.0 - ENVMAP_GGX_ROUGHNESS_MIN) * float(ENVMAP_GGX_LEVELS - 1U);
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vec3 ggxcolor = textureLod(envmap_ggx, direction, level).rgb;
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if (any(isnan(ggxcolor)) || any(isinf(ggxcolor))) ggxcolor = vec3(0.0);
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ggxcolor = max(ggxcolor, vec3(0.0));
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// the prefiltered map takes over over the first tenth of the roughness above its lowest level
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return mix(boxcolor, ggxcolor, clamp((roughness - ENVMAP_GGX_ROUGHNESS_MIN) * 10.0, 0.0, 1.0));
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}
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else
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{
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return boxcolor;
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}
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}
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vec3 envmap_color( vec3 normal )
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{
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return envmap_sample_lod(envmap_direction(normal), 0.0);
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}
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// Roughness-aware env map lookup — uses mip levels for blurry reflections.
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// lod 0.0 = mirror sharp, lod ~8.0 = fully diffuse blur.
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vec3 envmap_color_lod(vec3 fragnormal, float lod)
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{
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return envmap_sample_lod(envmap_direction(fragnormal), lod);
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}
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// reflection of the surroundings in a surface of the given perceptual roughness (0 mirror, 1 matte)
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vec3 envmap_color_rough(vec3 fragnormal, float roughness)
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{
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return envmap_sample_rough(envmap_direction(fragnormal), roughness);
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}
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