88 lines
2.5 KiB
GLSL
88 lines
2.5 KiB
GLSL
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// -*-C++-*-
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#version 120
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// doing directionality is surprisingly complicated - with just the vector and the eye we can't
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// do a spherical billboard, but the animation itself operates before the shader, so
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// the model-coordinate to eye relationship is always the same
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// thus we need to use pitch, yaw and roll to get the current model space coordinates
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uniform float pitch;
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uniform float roll;
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uniform float hdg;
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varying vec3 vertex;
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varying vec3 relPos;
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varying vec3 normal;
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void main()
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{
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vec4 ep = gl_ModelViewMatrixInverse * vec4(0.0,0.0,0.0,1.0);
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vec4 l = gl_ModelViewMatrixInverse * vec4(0.0,0.0,1.0,1.0);
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vec3 u = normalize(ep.xyz - l.xyz);
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vec3 absu = abs(u);
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vec3 r = normalize(vec3(-u.y, u.x, 0.0));
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vec3 w = cross(u, r);
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vertex = gl_Vertex.xyz;
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relPos = vertex - ep.xyz;
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normal = gl_NormalMatrix * gl_Normal;
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gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
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gl_Position.xyz = gl_Vertex.x * u;
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gl_Position.xyz += gl_Vertex.y * r;
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gl_Position.xyz += gl_Vertex.z * w;
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gl_Position = gl_ModelViewProjectionMatrix * gl_Position;
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//gl_Position = ftransform();
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gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
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gl_FrontColor = vec4 (1.0,1.0,1.0,1.0);
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gl_BackColor = gl_FrontColor;
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}
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/*
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void rotationMatrixPR(in float sinRx, in float cosRx, in float sinRy, in float cosRy, out mat4 rotmat)
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{
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rotmat = mat4( cosRy , sinRx * sinRy , cosRx * sinRy, 0.0,
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0.0 , cosRx , -sinRx * cosRx, 0.0,
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-sinRy, sinRx * cosRy, cosRx * cosRy , 0.0,
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0.0 , 0.0 , 0.0 , 1.0 );
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}
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void rotationMatrixH(in float sinRz, in float cosRz, out mat4 rotmat)
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{
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rotmat = mat4( cosRz, -sinRz, 0.0, 0.0,
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sinRz, cosRz, 0.0, 0.0,
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0.0 , 0.0 , 1.0, 0.0,
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0.0 , 0.0 , 0.0, 1.0 );
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}
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//prepare rotation matrix
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mat4 RotMatPR;
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mat4 RotMatH;
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float _roll = roll;
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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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rotationMatrixPR(sinRx, cosRx, sinRy, cosRy, RotMatPR);
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rotationMatrixH(sinRz, cosRz, RotMatH);
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vec3 model_x = (RotMatH * RotMatPR * vec4 (1.0, 0.0, 0.0, 0.0)).xyz;
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vec3 model_y = (RotMatH * RotMatPR * vec4 (0.0, 1.0, 0.0, 0.0)).xyz;
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vec3 model_z = (RotMatH * RotMatPR * vec4 (0.0, 0.0, 1.0, 0.0)).xyz;
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vec3 pointingVec = normalize(pointing_x * model_x + pointing_y * model_y + pointing_z * model_z);
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pointing_angle = dot (viewDir, pointingVec);*/
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