70 lines
2.2 KiB
Text
70 lines
2.2 KiB
Text
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// Yaw
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void rotation_matrix_H(in float sinRz, in float cosRz, out mat3 rotmat)
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{
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rotmat = mat3( cosRz, -sinRz, 0.0,
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sinRz, cosRz, 0.0,
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0.0 , 0.0 , 1.0);
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}
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// Pitch
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void rotation_matrix_P(in float sinRy, in float cosRy, out mat3 rotmat)
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{
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rotmat = mat3( cosRy, 0.0 , sinRy,
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0.0 , 1.0 , 0.0,
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-sinRy, 0.0 , cosRy);
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}
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// Roll
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void rotation_matrix_R(in float sinRx, in float cosRx, out mat3 rotmat)
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{
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rotmat = mat3( 1.0 , 0.0 , 0.0,
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0.0 , cosRx , -sinRx,
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0.0 , sinRx , cosRx);
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}
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void scale_matrix(in float scale, out mat3 scalemat)
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{
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scalemat = mat3(scale, 0.0 , 0.0 ,
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0.0 , scale, 0.0 ,
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0.0 , 0.0 , scale);
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}
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/* apply_instance_transforms
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* Takes the position, normal of an vertex, and position/rotation/scale of
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* one instance, and transforms the original position and normal of the
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* vertex to match it's instanced version.
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*/
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void apply_instance_transforms(inout vec3 position, inout vec3 normal, in vec3 instance_position, in vec4 instance_rotation_and_scale)
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{
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// Handle rotation and scaling
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mat3 ScaleMat;
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scale_matrix(instance_rotation_and_scale.w, ScaleMat);
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mat3 RotMatH;
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mat3 RotMatP;
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mat3 RotMatR;
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float hdg = instance_rotation_and_scale.x;
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float pitch = instance_rotation_and_scale.y;
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float roll = instance_rotation_and_scale.z;
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// if (roll > 90.0 || roll < -90.0) {roll = -roll;}
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float cosRx = cos(radians(-roll));
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float sinRx = sin(radians(-roll));
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float cosRy = cos(radians(-pitch));
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float sinRy = sin(radians(-pitch));
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float cosRz = cos(radians(-hdg));
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float sinRz = sin(radians(-hdg));
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rotation_matrix_R(sinRx, cosRx, RotMatR);
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rotation_matrix_P(sinRy, cosRy, RotMatP);
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rotation_matrix_H(sinRz, cosRz, RotMatH);
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// Transform position using scaling and rotation matrices
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position = RotMatH * RotMatP * RotMatR * ScaleMat * position;
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// Offset model to correct location w.r.t instancing center
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position = position + instance_position.xyz;
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// Transform normal using rotation matrices
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normal = gl_NormalMatrix * (RotMatH * RotMatP * RotMatR * gl_Normal);
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}
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