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#version 120
uniform vec3 u_CameraPosition;
uniform mat4 u_ModelMatrix;
varying vec2 v_TexCoord;
const float PI = 3.14159265358979323846;
mat4 rotateMatrix(float angle, vec3 axis){
float x = axis.x;
float y = axis.y;
float z = axis.z;
float c = cos(angle);
float s = sin(angle);
float t = 1.0 - c;
return mat4(
c+x*x*t, t*x*y - s*z, t*x*z + s*y, 0.0,
t*x*y + s*z, t*y*y + c, t*y*z - s*x, 0.0,
t*x*z - s*y, t*y*z + s*x, t*z*z + c, 0.0,
0.0, 0.0, 0.0, 1.0
);
}
void main() {
v_TexCoord = gl_MultiTexCoord0.xy;
float xAngle = atan(u_CameraPosition.y,u_CameraPosition.z) - PI/2;
float c = cos(xAngle);
float s = sin(xAngle);
mat4 xRotate = mat4(
1.0, 0.0, 0.0, 0.0,
0.0, c, -s, 0.0,
0.0, s, c, 0.0,
0.0, 0.0, 0.0, 1.0
);
gl_Position = gl_ModelViewProjectionMatrix * (u_ModelMatrix*(xRotate*gl_Vertex));
}
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