luboslenco
67 lines
1.8 KiB
GLSL
67 lines
1.8 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 texStep;
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uniform float radius;
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uniform vec3 cameraRight;
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uniform sampler2D gbufferD;
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#ifdef HLSL
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uniform sampler2D texa; // direct3d12 unit align
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#endif
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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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vec3 getPos(vec2 uv) {
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#ifdef HLSL
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float keep = textureLod(texa, vec2(0.0, 0.0), 0.0).r; // direct3d12 unit align
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float keep2 = pos.x + nor.x;
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#endif
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#if defined(HLSL) || defined(METAL) || defined(SPIRV)
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float depth = textureLod(gbufferD, vec2(uv.x, 1.0 - uv.y), 0.0).r;
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#else
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float depth = textureLod(gbufferD, uv, 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 = invVP * wpos;
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return wpos.xyz / wpos.w;
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}
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vec3 getNormal(vec3 p0, vec2 uv) {
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vec2 texStepLocal = texStep; // TODO: SPIRV workaround
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vec3 p1 = getPos(uv + vec2(texStepLocal.x * 4, 0));
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vec3 p2 = getPos(uv + vec2(0, texStepLocal.y * 4));
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return normalize(cross(p2 - p0, p1 - p0));
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}
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void createBasis(vec3 normal, out vec3 tangent, out vec3 binormal) {
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tangent = normalize(cameraRight - normal * dot(cameraRight, normal));
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binormal = cross(tangent, normal);
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}
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void main() {
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texCoord = tex;
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vec3 wpos = getPos(mouse);
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vec2 uv1 = mouse + texStep * 4;
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vec2 uv2 = mouse - texStep * 4;
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vec3 wpos1 = getPos(uv1);
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vec3 wpos2 = getPos(uv2);
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vec3 n = normalize(
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getNormal(wpos, mouse) +
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getNormal(wpos1, uv1) +
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getNormal(wpos2, uv2)
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);
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vec3 n_tan;
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vec3 n_bin;
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createBasis(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 = VP * vec4(wpos, 1.0);
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}
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