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This commit is contained in:
Josh Holtrop 2011-05-09 17:07:06 -04:00
parent e05c62725c
commit e06395ff5d
1 changed files with 12 additions and 8 deletions
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20
glslUtil/glslUtil.c
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@ -108,12 +108,15 @@ void guMatrixFrustum(guMatrix4x4 *m,
mult[i][j] = 0.0;
}
}
mult[0][0] = 2 * near / (right - left);
mult[0][2] = (right + left) / (right - left);
mult[1][1] = 2 * near / (top - bottom);
mult[1][2] = (top + bottom) / (top - bottom);
mult[2][2] = - (far + near) / (far - near);
mult[2][3] = - 2 * far * near / (far - near);
GLfloat rl = right - left;
GLfloat tb = top - bottom;
GLfloat fn = far - near;
mult[0][0] = 2 * near / rl;
mult[0][2] = (right + left) / rl;
mult[1][1] = 2 * near / tb;
mult[1][2] = (top + bottom) / tb;
mult[2][2] = - (far + near) / fn;
mult[2][3] = - 2 * far * near / fn;
mult[3][2] = -1.0;
guMatrixMult(m, m, &mult);
}
@ -131,10 +134,11 @@ void guPerspective(guMatrix4x4 *m, GLfloat fovy, GLfloat aspect,
}
}
GLfloat f = 1.0 / tan(fovy / 2.0);
GLfloat nf = near - far;
mult[0][0] = f / aspect;
mult[1][1] = f;
mult[2][2] = (far + near) / (near - far);
mult[2][3] = (2 * far * near) / (near - far);
mult[2][2] = (far + near) / nf;
mult[2][3] = (2 * far * near) / nf;
mult[3][2] = -1.0;
guMatrixMult(m, m, &mult);
}