diff options
Diffstat (limited to 'indra/newview/app_settings/shaders/class1/deferred/pbrterrainUtilF.glsl')
| -rw-r--r-- | indra/newview/app_settings/shaders/class1/deferred/pbrterrainUtilF.glsl | 473 |
1 files changed, 473 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/pbrterrainUtilF.glsl b/indra/newview/app_settings/shaders/class1/deferred/pbrterrainUtilF.glsl new file mode 100644 index 0000000000..935c3f9301 --- /dev/null +++ b/indra/newview/app_settings/shaders/class1/deferred/pbrterrainUtilF.glsl @@ -0,0 +1,473 @@ +/** + * @file class1\deferred\pbrterrainUtilF.glsl + * + * $LicenseInfo:firstyear=2023&license=viewerlgpl$ + * Second Life Viewer Source Code + * Copyright (C) 2023, Linden Research, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; + * version 2.1 of the License only. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA + * $/LicenseInfo$ + */ + +/*[EXTRA_CODE_HERE]*/ + +/** + * Triplanar mapping implementation adapted from Inigo Quilez' example shader, + * MIT license. + * https://www.shadertoy.com/view/MtsGWH + * Copyright © 2015 Inigo Quilez + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: The above copyright + * notice and this permission notice shall be included in all copies or + * substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", + * WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED + * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF + * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#define TERRAIN_PBR_DETAIL_EMISSIVE 0 +#define TERRAIN_PBR_DETAIL_OCCLUSION -1 +#define TERRAIN_PBR_DETAIL_NORMAL -2 +#define TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS -3 + +in vec3 vary_vertex_normal; + +vec3 srgb_to_linear(vec3 c); + +// A relatively agressive threshold for terrain material mixing sampling +// cutoff. This ensures that only one or two materials are used in most places, +// making PBR terrain blending more performant. Should be greater than 0 to work. +#define TERRAIN_RAMP_MIX_THRESHOLD 0.1 +// A small threshold for triplanar mapping sampling cutoff. This and +// TERRAIN_TRIPLANAR_BLEND_FACTOR together ensures that only one or two samples +// per texture are used in most places, making triplanar mapping more +// performant. Should be greater than 0 to work. +// There's also an artistic design choice in the use of these factors, and the +// use of triplanar generally. Don't take these triplanar constants for granted. +#define TERRAIN_TRIPLANAR_MIX_THRESHOLD 0.01 + +#define SAMPLE_X 1 << 0 +#define SAMPLE_Y 1 << 1 +#define SAMPLE_Z 1 << 2 +#define MIX_X 1 << 3 +#define MIX_Y 1 << 4 +#define MIX_Z 1 << 5 +#define MIX_W 1 << 6 + +struct PBRMix +{ + vec4 col; // RGB color with alpha, linear space +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_OCCLUSION) + vec3 orm; // Occlusion, roughness, metallic +#elif (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + vec2 rm; // Roughness, metallic +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + vec3 vNt; // Unpacked normal texture sample, vector +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + vec3 emissive; // RGB emissive color, linear space +#endif +}; + +PBRMix init_pbr_mix() +{ + PBRMix mix; + mix.col = vec4(0); +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_OCCLUSION) + mix.orm = vec3(0); +#elif (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + mix.rm = vec2(0); +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + mix.vNt = vec3(0); +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + mix.emissive = vec3(0); +#endif + return mix; +} + +// Usage example, for two weights: +// vec2 weights = ... // Weights must add up to 1 +// PBRMix mix = init_pbr_mix(); +// PBRMix mix1 = ... +// mix = mix_pbr(mix, mix1, weights.x); +// PBRMix mix2 = ... +// mix = mix_pbr(mix, mix2, weights.y); +PBRMix mix_pbr(PBRMix mix1, PBRMix mix2, float mix2_weight) +{ + PBRMix mix; + mix.col = mix1.col + (mix2.col * mix2_weight); +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_OCCLUSION) + mix.orm = mix1.orm + (mix2.orm * mix2_weight); +#elif (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + mix.rm = mix1.rm + (mix2.rm * mix2_weight); +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + mix.vNt = mix1.vNt + (mix2.vNt * mix2_weight); +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + mix.emissive = mix1.emissive + (mix2.emissive * mix2_weight); +#endif + return mix; +} + +PBRMix sample_pbr( + vec2 uv + , sampler2D tex_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , sampler2D tex_orm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + , sampler2D tex_vNt +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , sampler2D tex_emissive +#endif + ) +{ + PBRMix mix; + mix.col = texture(tex_col, uv); + mix.col.rgb = srgb_to_linear(mix.col.rgb); +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_OCCLUSION) + mix.orm = texture(tex_orm, uv).xyz; +#elif (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + mix.rm = texture(tex_orm, uv).yz; +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + mix.vNt = texture(tex_vNt, uv).xyz*2.0-1.0; +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + mix.emissive = srgb_to_linear(texture(tex_emissive, uv).xyz); +#endif + return mix; +} + +struct TerrainTriplanar +{ + vec3 weight; + int type; +}; + +struct TerrainMix +{ + vec4 weight; + int type; +}; + +#define TerrainMixSample vec4[4] +#define TerrainMixSample3 vec3[4] + +TerrainMix get_terrain_mix_weights(float alpha1, float alpha2, float alphaFinal) +{ + TerrainMix tm; + vec4 sample_x = vec4(1,0,0,0); + vec4 sample_y = vec4(0,1,0,0); + vec4 sample_z = vec4(0,0,1,0); + vec4 sample_w = vec4(0,0,0,1); + + tm.weight = mix( mix(sample_w, sample_z, alpha2), mix(sample_y, sample_x, alpha1), alphaFinal ); + tm.weight -= TERRAIN_RAMP_MIX_THRESHOLD; + ivec4 usage = max(ivec4(0), ivec4(ceil(tm.weight))); + // Prevent negative weights and keep weights balanced + tm.weight = tm.weight*vec4(usage); + tm.weight /= (tm.weight.x + tm.weight.y + tm.weight.z + tm.weight.w); + + tm.type = (usage.x * MIX_X) | + (usage.y * MIX_Y) | + (usage.z * MIX_Z) | + (usage.w * MIX_W); + return tm; +} + +TerrainTriplanar _t_triplanar() +{ + float sharpness = TERRAIN_TRIPLANAR_BLEND_FACTOR; + float threshold = TERRAIN_TRIPLANAR_MIX_THRESHOLD; + vec3 weight_signed = pow(abs(vary_vertex_normal), vec3(sharpness)); + weight_signed /= (weight_signed.x + weight_signed.y + weight_signed.z); + weight_signed -= vec3(threshold); + TerrainTriplanar tw; + // *NOTE: Make sure the threshold doesn't affect the materials + tw.weight = max(vec3(0), weight_signed); + tw.weight /= (tw.weight.x + tw.weight.y + tw.weight.z); + ivec3 usage = ivec3(round(max(vec3(0), sign(weight_signed)))); + tw.type = ((usage.x) * SAMPLE_X) | + ((usage.y) * SAMPLE_Y) | + ((usage.z) * SAMPLE_Z); + return tw; +} + +// Assume weights add to 1 +float terrain_mix(TerrainMix tm, vec4 tms4) +{ + return (tm.weight.x * tms4[0]) + + (tm.weight.y * tms4[1]) + + (tm.weight.z * tms4[2]) + + (tm.weight.w * tms4[3]); +} + +#if TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 3 +// Triplanar mapping + +// Pre-transformed texture coordinates for each axial uv slice (Packing: xy, yz, (-x)z, unused) +#define TerrainCoord vec4[2] + +vec2 _t_uv(vec2 uv_unflipped, float sign_or_zero) +{ + // Handle case where sign is 0 + float sign = (2.0*sign_or_zero) + 1.0; + sign /= abs(sign); + // If the vertex normal is negative, flip the texture back + // right-side up. + vec2 uv = uv_unflipped * vec2(sign, 1); + return uv; +} + +vec3 _t_normal_post_1(vec3 vNt0, float sign_or_zero) +{ + // Assume normal is unpacked + vec3 vNt1 = vNt0; + // Get sign + float sign = sign_or_zero; + // Handle case where sign is 0 + sign = (2.0*sign) + 1.0; + sign /= abs(sign); + // If the sign is negative, rotate normal by 180 degrees + vNt1.xy = (min(0, sign) * vNt1.xy) + (min(0, -sign) * -vNt1.xy); + return vNt1; +} + +// Triplanar-specific normal texture fixes +vec3 _t_normal_post_x(vec3 vNt0) +{ + vec3 vNt_x = _t_normal_post_1(vNt0, sign(vary_vertex_normal.x)); + // *HACK: Transform normals according to orientation of the UVs + vNt_x.xy = vec2(-vNt_x.y, vNt_x.x); + return vNt_x; +} +vec3 _t_normal_post_y(vec3 vNt0) +{ + vec3 vNt_y = _t_normal_post_1(vNt0, sign(vary_vertex_normal.y)); + // *HACK: Transform normals according to orientation of the UVs + vNt_y.xy = -vNt_y.xy; + return vNt_y; +} +vec3 _t_normal_post_z(vec3 vNt0) +{ + vec3 vNt_z = _t_normal_post_1(vNt0, sign(vary_vertex_normal.z)); + return vNt_z; +} + +PBRMix terrain_sample_pbr( + TerrainCoord terrain_coord + , TerrainTriplanar tw + , sampler2D tex_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , sampler2D tex_orm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + , sampler2D tex_vNt +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , sampler2D tex_emissive +#endif + ) +{ + PBRMix mix = init_pbr_mix(); + +#define get_uv_x() _t_uv(terrain_coord[0].zw, sign(vary_vertex_normal.x)) +#define get_uv_y() _t_uv(terrain_coord[1].xy, sign(vary_vertex_normal.y)) +#define get_uv_z() _t_uv(terrain_coord[0].xy, sign(vary_vertex_normal.z)) + switch (tw.type & SAMPLE_X) + { + case SAMPLE_X: + PBRMix mix_x = sample_pbr( + get_uv_x() + , tex_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , tex_orm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + , tex_vNt +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , tex_emissive +#endif + ); +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + // Triplanar-specific normal texture fix + mix_x.vNt = _t_normal_post_x(mix_x.vNt); +#endif + mix = mix_pbr(mix, mix_x, tw.weight.x); + break; + default: + break; + } + + switch (tw.type & SAMPLE_Y) + { + case SAMPLE_Y: + PBRMix mix_y = sample_pbr( + get_uv_y() + , tex_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , tex_orm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + , tex_vNt +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , tex_emissive +#endif + ); +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + // Triplanar-specific normal texture fix + mix_y.vNt = _t_normal_post_y(mix_y.vNt); +#endif + mix = mix_pbr(mix, mix_y, tw.weight.y); + break; + default: + break; + } + + switch (tw.type & SAMPLE_Z) + { + case SAMPLE_Z: + PBRMix mix_z = sample_pbr( + get_uv_z() + , tex_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , tex_orm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + , tex_vNt +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , tex_emissive +#endif + ); +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + // Triplanar-specific normal texture fix + // *NOTE: Bottom face has not been tested + mix_z.vNt = _t_normal_post_z(mix_z.vNt); +#endif + mix = mix_pbr(mix, mix_z, tw.weight.z); + break; + default: + break; + } + + return mix; +} + +#elif TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 1 + +#define TerrainCoord vec2 + +#define terrain_sample_pbr sample_pbr + +#endif + +PBRMix multiply_factors_pbr( + PBRMix mix_in + , vec4 factor_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_OCCLUSION) + , vec3 factor_orm +#elif (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , vec2 factor_rm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , vec3 factor_emissive +#endif + ) +{ + PBRMix mix = mix_in; + mix.col *= factor_col; +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_OCCLUSION) + mix.orm *= factor_orm; +#elif (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + mix.rm *= factor_rm; +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + mix.emissive *= factor_emissive; +#endif + return mix; +} + +PBRMix terrain_sample_and_multiply_pbr( + TerrainCoord terrain_coord + , sampler2D tex_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , sampler2D tex_orm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + , sampler2D tex_vNt +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , sampler2D tex_emissive +#endif + , vec4 factor_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_OCCLUSION) + , vec3 factor_orm +#elif (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , vec2 factor_rm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , vec3 factor_emissive +#endif + ) +{ + PBRMix mix = terrain_sample_pbr( + terrain_coord +#if TERRAIN_PLANAR_TEXTURE_SAMPLE_COUNT == 3 + , _t_triplanar() +#endif + , tex_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , tex_orm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_NORMAL) + , tex_vNt +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , tex_emissive +#endif + ); + + mix = multiply_factors_pbr(mix + , factor_col +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_OCCLUSION) + , factor_orm +#elif (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_METALLIC_ROUGHNESS) + , factor_rm +#endif +#if (TERRAIN_PBR_DETAIL >= TERRAIN_PBR_DETAIL_EMISSIVE) + , factor_emissive +#endif + ); + + return mix; +} |