84 lines
2.0 KiB
Scala
84 lines
2.0 KiB
Scala
$input v_texcoord0
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/*
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* Copyright 2021 elven cache. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
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*/
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#include "../common/common.sh"
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#include "parameters.sh"
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#include "normal_encoding.sh"
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SAMPLER2D(s_color, 0);
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SAMPLER2D(s_normal, 1);
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SAMPLER2D(s_depth, 2);
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SAMPLER2D(s_shadows, 3);
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// from assao sample, cs_assao_prepare_depths.sc
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vec3 NDCToViewspace( vec2 pos, float viewspaceDepth )
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{
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vec3 ret;
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ret.xy = (u_ndcToViewMul * pos.xy + u_ndcToViewAdd) * viewspaceDepth;
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ret.z = viewspaceDepth;
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return ret;
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}
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void main()
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{
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vec2 texCoord = v_texcoord0;
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vec4 colorId = texture2D(s_color, texCoord);
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vec3 color = toLinear(colorId.xyz);
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float materialId = colorId.w;
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if (0.0 < materialId)
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{
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vec4 normalRoughness = texture2D(s_normal, texCoord);
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vec3 normal = NormalDecode(normalRoughness.xyz);
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float roughness = normalRoughness.w;
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// transform normal into view space
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mat4 worldToView = mat4(
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u_worldToView0,
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u_worldToView1,
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u_worldToView2,
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u_worldToView3
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);
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vec3 vsNormal = instMul(worldToView, vec4(normal, 0.0)).xyz;
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// read depth and recreate position
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float linearDepth = texture2D(s_depth, texCoord).x;
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vec3 viewSpacePosition = NDCToViewspace(texCoord, linearDepth);
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float shadow = texture2D(s_shadows, texCoord).x;
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// need to get a valid view vector for any microfacet stuff :(
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float gloss = 1.0-roughness;
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float specPower = 62.0 * gloss + 2.0;
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vec3 light = (u_lightPosition - viewSpacePosition);
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float lightDistSq = dot(light, light) + 1e-5;
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light = normalize(light);
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float NdotL = saturate(dot(vsNormal, light));
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float diffuse = NdotL * (1.0/lightDistSq);
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float specular = 5.0 * pow(NdotL, specPower);
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float lightAmount = mix(diffuse, specular, 0.04) * shadow;
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color = (color * lightAmount);
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color = toGamma(color);
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// debug display shadows only
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if (0.0 < u_displayShadows)
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{
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color = vec3_splat(shadow);
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}
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}
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// else, assume color is unlit
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gl_FragColor = vec4(color, 1.0);
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}
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