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66 lines
2.8 KiB
GLSL
66 lines
2.8 KiB
GLSL
#if ENVMAP_ENABLED
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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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uniform samplerCube envmap_ggx;
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#endif
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vec3 envmap_color( vec3 normal )
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{
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#if ENVMAP_ENABLED
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vec3 refvec = reflect(f_pos.xyz, normal); // view space
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refvec = vec3(inv_view * vec4(refvec, 0.0)); // world space
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vec3 envcolor = texture(envmap, refvec).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). Without this
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// guard, a single bad texel propagates through env_reflection in
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// apply_lights() and produces one-frame black flashes on glossy
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// (esp. specgloss) surfaces.
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if (any(isnan(envcolor)) || any(isinf(envcolor))) envcolor = vec3(0.0);
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envcolor = max(envcolor, vec3(0.0));
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#else
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vec3 envcolor = vec3(0.5);
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#endif
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return envcolor;
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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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#if ENVMAP_ENABLED
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vec3 refvec = reflect(f_pos.xyz, fragnormal); // view space — matches envmap_color exactly
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refvec = vec3(inv_view * vec4(refvec, 0.0)); // world space — was missing
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vec3 envcolor = textureLod(envmap, refvec, lod).rgb;
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// See envmap_color() above — same NaN/Inf sanitize, also needed here
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// because mipmap generation propagates a single NaN texel across the
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// whole mip chain.
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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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#else
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return vec3(0.5); // was vec3(0.0), match the non-LOD fallback
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#endif
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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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// 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_color_lod(fragnormal, roughness * MAX_REFLECTION_LOD);
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#if ENVMAP_ENABLED
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if (env_ggx == 0U || roughness <= ENVMAP_GGX_ROUGHNESS_MIN)
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return boxcolor;
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vec3 refvec = reflect(f_pos.xyz, fragnormal);
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refvec = vec3(inv_view * vec4(refvec, 0.0));
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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, refvec, 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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#else
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return boxcolor;
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#endif
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}
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