68 lines
1.9 KiB
Scala
68 lines
1.9 KiB
Scala
$input v_lightCenterScale, v_color0
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/*
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* Copyright 2016 Joseph Cherlin. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
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#include "../common/common.sh"
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SAMPLER2D(s_normal, 0); // Normal output from gbuffer
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SAMPLER2D(s_depth, 1); // Depth output from gbuffer
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uniform mat4 u_invMvp;
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float toClipSpaceDepth(float _depthTextureZ)
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{
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#if BGFX_SHADER_LANGUAGE_HLSL || BGFX_SHADER_LANGUAGE_PSSL || BGFX_SHADER_LANGUAGE_METAL
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return _depthTextureZ;
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#else
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return _depthTextureZ * 2.0 - 1.0;
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#endif // BGFX_SHADER_LANGUAGE_HLSL || BGFX_SHADER_LANGUAGE_PSSL || BGFX_SHADER_LANGUAGE_METAL
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}
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vec3 clipToWorld(mat4 _invViewProj, vec3 _clipPos)
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{
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vec4 wpos = mul(_invViewProj, vec4(_clipPos, 1.0) );
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return wpos.xyz / wpos.w;
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}
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void main()
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{
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#if BGFX_SHADER_LANGUAGE_HLSL && (BGFX_SHADER_LANGUAGE_HLSL < 4)
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vec2 texCoord = gl_FragCoord.xy * u_viewTexel.xy + u_viewTexel.xy * vec2_splat(0.5);
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#else
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vec2 texCoord = gl_FragCoord.xy * u_viewTexel.xy;
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#endif
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// Get world position
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float deviceDepth = texture2D(s_depth, texCoord).x;
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float depth = toClipSpaceDepth(deviceDepth);
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vec3 clip = vec3(texCoord * 2.0 - 1.0, depth);
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#if BGFX_SHADER_LANGUAGE_HLSL || BGFX_SHADER_LANGUAGE_PSSL || BGFX_SHADER_LANGUAGE_METAL
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clip.y = -clip.y;
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#endif // BGFX_SHADER_LANGUAGE_HLSL || BGFX_SHADER_LANGUAGE_PSSL || BGFX_SHADER_LANGUAGE_METAL
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vec3 wpos = clipToWorld(u_invMvp, clip);
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// Get normal from its map, and decompress
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vec3 n = texture2D(s_normal, texCoord).xyz*2.0-1.0;
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// Do lighting
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vec3 pointToLight = v_lightCenterScale.xyz-wpos;
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float lightLen = sqrt(dot(pointToLight, pointToLight));
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float lightFalloff;
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if (lightLen > v_lightCenterScale.w)
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lightFalloff = 0.0;
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else
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lightFalloff = 1.0-(lightLen/v_lightCenterScale.w); // Linear falloff for light (could use dist sq if you want)
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vec3 l = normalize(pointToLight)*lightFalloff;
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gl_FragColor.xyz = v_color0.xyz * max(0.0, dot(n,l));
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gl_FragColor.w = 1.0;
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}
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