luboslenco
50 lines
1.4 KiB
GLSL
50 lines
1.4 KiB
GLSL
#version 330
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uniform mat4 VP;
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uniform mat4 invVP;
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uniform vec2 mouse;
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uniform vec2 step;
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uniform float radius;
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uniform sampler2D gbufferD;
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uniform sampler2D gbuffer0;
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in vec4 pos;
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in vec2 nor;
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in vec2 tex;
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out vec2 texCoord;
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vec2 octahedronWrap(const vec2 v) { return (1.0 - abs(v.yx)) * (vec2(v.x >= 0.0 ? 1.0 : -1.0, v.y >= 0.0 ? 1.0 : -1.0)); }
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mat3 rotAxis(vec3 axis, float a) {
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float c = cos(a);
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vec3 as = axis * sin(a);
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mat3 p = mat3(axis.x * axis, axis.y * axis, axis.z * axis);
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mat3 q = mat3(c, -as.z, as.y, as.z, c, -as.x, -as.y, as.x, c);
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return p * (1.0 - c) + q;
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}
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vec3 getNormal(vec2 uv) {
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vec2 g0 = textureLod(gbuffer0, mouse, 0.0).rg;
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vec3 n;
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n.z = 1.0 - abs(g0.x) - abs(g0.y);
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n.xy = n.z >= 0.0 ? g0.xy : octahedronWrap(g0.xy);
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return n;
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}
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void main() {
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texCoord = tex;
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float depth = textureLod(gbufferD, mouse, 0.0).r;
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vec4 wpos = vec4(mouse * 2.0 - 1.0, depth * 2.0 - 1.0, 1.0);
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wpos = invVP * wpos;
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wpos.xyz /= wpos.w;
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vec3 n = normalize(
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getNormal(mouse + vec2(step.x, step.y)) +
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getNormal(mouse + vec2(-step.x, step.y)) +
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getNormal(mouse + vec2(-step.x, -step.y)) +
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getNormal(mouse + vec2(step.x, -step.y)) +
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getNormal(mouse)
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);
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float ax = acos(dot(vec3(1,0,0), vec3(n.x,0,0)));
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float az = acos(dot(vec3(0,0,1), vec3(0,0,n.z)));
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float sy = -sign(n.y);
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wpos.xyz +=
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rotAxis(vec3(1,0,0), -az * sy + 3.14/2) *
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rotAxis(vec3(0,0,1), ax + 3.14/2) *
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(pos.xyz * radius);
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gl_Position = VP * vec4(wpos.xyz, 1.0);
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}
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