luboslenco
66 lines
1.6 KiB
GLSL
66 lines
1.6 KiB
GLSL
#version 450
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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 tex_step;
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uniform float radius;
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uniform vec3 camera_right;
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uniform sampler2D gbufferD;
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#ifdef HLSL
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in vec4 pos;
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in vec2 nor;
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#endif
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in vec2 tex;
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out vec2 tex_coord;
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vec3 get_pos(vec2 uv) {
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#ifdef HLSL
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float keep = pos.x + nor.x;
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#endif
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#ifdef GLSL
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float depth = textureLod(gbufferD, uv, 0.0).r;
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#else
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float depth = textureLod(gbufferD, vec2(uv.x, 1.0 - uv.y), 0.0).r;
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#endif
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vec4 wpos = vec4(uv * 2.0 - 1.0, depth * 2.0 - 1.0, 1.0);
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wpos = mul(wpos, invVP);
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return wpos.xyz / wpos.w;
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}
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vec3 get_normal(vec3 p0, vec2 uv) {
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vec3 p1 = get_pos(uv + vec2(tex_step.x * 4.0, 0.0));
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vec3 p2 = get_pos(uv + vec2(0.0, tex_step.y * 4.0));
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return normalize(cross(p2 - p0, p1 - p0));
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}
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void create_basis(vec3 normal, OUT(vec3, tangent), OUT(vec3, binormal)) {
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tangent = normalize(camera_right - normal * dot(camera_right, normal));
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binormal = cross(tangent, normal);
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}
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void main() {
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tex_coord = tex;
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vec3 wpos = get_pos(mouse);
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vec2 uv1 = mouse + tex_step * vec2(4.0, 4.0);
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vec2 uv2 = mouse - tex_step * vec2(4.0, 4.0);
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vec3 wpos1 = get_pos(uv1);
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vec3 wpos2 = get_pos(uv2);
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vec3 n = normalize(
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get_normal(wpos, mouse) +
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get_normal(wpos1, uv1) +
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get_normal(wpos2, uv2)
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);
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vec3 n_tan;
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vec3 n_bin;
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create_basis(n, n_tan, n_bin);
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if (gl_VertexID == 0) wpos += normalize(-n_tan - n_bin) * 0.7 * radius;
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else if (gl_VertexID == 1) wpos += normalize( n_tan - n_bin) * 0.7 * radius;
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else if (gl_VertexID == 2) wpos += normalize( n_tan + n_bin) * 0.7 * radius;
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else if (gl_VertexID == 3) wpos += normalize(-n_tan + n_bin) * 0.7 * radius;
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gl_Position = mul(vec4(wpos, 1.0), VP);
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}
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