60 lines
1.5 KiB
GLSL
60 lines
1.5 KiB
GLSL
in vec2 quadcorner;
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in vec2 texcoord;
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in vec3 position;
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in float lifetime;
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in float size;
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in vec3 rotationvec;
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in float anglespeed;
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out float lf;
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out vec2 tc;
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out vec3 pc;
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void main(void)
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{
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tc = texcoord;
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lf = lifetime;
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vec3 newposition = position;
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// from http://jeux.developpez.com/faq/math
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float angle = lf * anglespeed;
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float sin_a = sin(angle / 2.);
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float cos_a = cos(angle / 2.);
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vec4 quaternion = normalize(vec4(rotationvec * sin_a, cos_a));
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float xx = quaternion.x * quaternion.x;
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float xy = quaternion.x * quaternion.y;
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float xz = quaternion.x * quaternion.z;
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float xw = quaternion.x * quaternion.w;
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float yy = quaternion.y * quaternion.y;
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float yz = quaternion.y * quaternion.z;
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float yw = quaternion.y * quaternion.w;
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float zz = quaternion.z * quaternion.z;
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float zw = quaternion.z * quaternion.w;
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vec4 col1 = vec4(
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1. - 2. * ( yy + zz ),
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2. * ( xy + zw ),
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2. * ( xz - yw ),
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0.);
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vec4 col2 = vec4(
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2. * ( xy - zw ),
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1. - 2. * ( xx + zz ),
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2. * ( yz + xw ),
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0.);
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vec4 col3 = vec4(
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2. * ( xz + yw ),
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2. * ( yz - xw ),
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1. - 2. * ( xx + yy ),
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0.);
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vec4 col4 = vec4(0., 0., 0., 1.);
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mat4 rotationMatrix = mat4(col1, col2, col3, col4);
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vec3 newquadcorner = size * vec3(quadcorner, 0.);
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newquadcorner = (rotationMatrix * vec4(newquadcorner, 0.)).xyz;
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vec4 viewpos = ViewMatrix * vec4(newposition + newquadcorner, 1.0);
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gl_Position = ProjectionMatrix * viewpos;
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pc = vec3(1.);
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}
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