// ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//
GLint gluES::gluProject(GLfloat objx, GLfloat objy, GLfloat objz,
const GLfloat modelMatrix[16],
const GLfloat projMatrix[16],
const GLint viewport[4],
GLfloat *winx, GLfloat *winy, GLfloat *winz)
{
float in[4];
float out[4];
in[0]=objx;
in[1]=objy;
in[2]=objz;
in[3]=1.0;
__gluMultMatrixVecf(modelMatrix, in, out);
__gluMultMatrixVecf(projMatrix, out, in);
if (in[3] == 0.0) return(GL_FALSE);
in[0] /= in[3];
in[1] /= in[3];
in[2] /= in[3];
/* Map x, y and z to range 0-1 */
in[0] = in[0] * 0.5f + 0.5f;
in[1] = in[1] * 0.5f + 0.5f;
in[2] = in[2] * 0.5f + 0.5f;
/* Map x,y to viewport */
in[0] = in[0] * viewport[2] + viewport[0];
in[1] = in[1] * viewport[3] + viewport[1];
*winx=in[0];
*winy=in[1];
*winz=in[2];
return(GL_TRUE);
}
GLAPI GLint APIENTRY
gluUnProject4(GLfloat winx, GLfloat winy, GLfloat winz, GLfloat clipw,
const GLfloat modelMatrix[16],
const GLfloat projMatrix[16],
const GLint viewport[4],
GLclampf nearVal, GLclampf farVal,
GLfloat *objx, GLfloat *objy, GLfloat *objz,
GLfloat *objw)
{
GLfloat finalMatrix[16];
GLfloat in[4];
GLfloat out[4];
__gluMultMatricesf(modelMatrix, projMatrix, finalMatrix);
if (!__gluInvertMatrixf(finalMatrix, finalMatrix))
{
return(GL_FALSE);
}
in[0]=winx;
in[1]=winy;
in[2]=winz;
in[3]=clipw;
/* Map x and y from window coordinates */
in[0] = (in[0] - viewport[0]) / viewport[2];
in[1] = (in[1] - viewport[1]) / viewport[3];
in[2] = (in[2] - nearVal) / (farVal - nearVal);
/* Map to range -1 to 1 */
in[0] = in[0] * 2 - 1;
in[1] = in[1] * 2 - 1;
in[2] = in[2] * 2 - 1;
__gluMultMatrixVecf(finalMatrix, in, out);
if (out[3] == 0.0)
{
return(GL_FALSE);
}
*objx = out[0];
*objy = out[1];
*objz = out[2];
*objw = out[3];
return(GL_TRUE);
}
GLU_API GLint GLU_APIENTRY
gluUnProject(GLfloat winx, GLfloat winy, GLfloat winz,
const GLfloat modelMatrix[16],
const GLfloat projMatrix[16],
const GLint viewport[4],
GLfloat* objx, GLfloat* objy, GLfloat* objz)
{
GLfloat finalMatrix[16];
GLfloat in[4];
GLfloat out[4];
__gluMultMatricesf(modelMatrix, projMatrix, finalMatrix);
if (!__gluInvertMatrixf(finalMatrix, finalMatrix))
{
return(GL_FALSE);
}
in[0]=winx;
in[1]=winy;
in[2]=winz;
in[3]=1.0;
/* Map x and y from window coordinates */
in[0] = (in[0] - viewport[0]) / viewport[2];
in[1] = (in[1] - viewport[1]) / viewport[3];
/* Map to range -1 to 1 */
in[0] = in[0] * 2 - 1;
in[1] = in[1] * 2 - 1;
in[2] = in[2] * 2 - 1;
__gluMultMatrixVecf(finalMatrix, in, out);
if (out[3] == 0.0)
{
return(GL_FALSE);
}
out[0] /= out[3];
out[1] /= out[3];
out[2] /= out[3];
*objx = out[0];
*objy = out[1];
*objz = out[2];
return(GL_TRUE);
}
