void CRhGLShaderProgram::SetupLight(const ON_Light& light)
{
GLfloat amb[4] = { light.Ambient().FractionRed(), light.Ambient().FractionGreen(), light.Ambient().FractionBlue(), 1.0f };
GLfloat diff[4] = { light.Diffuse().FractionRed(), light.Diffuse().FractionGreen(), light.Diffuse().FractionBlue(), 1.0f };
GLfloat spec[4] = { light.Specular().FractionRed(), light.Specular().FractionGreen(), light.Specular().FractionBlue(), 1.0f };
float pos[3] = { light.Direction().x, light.Direction().y, light.Direction().z };
if ( m_Uniforms.rglLightAmbient >= 0 )
glUniform4fv( m_Uniforms.rglLightAmbient, 1, amb );
if ( m_Uniforms.rglLightDiffuse >= 0 )
glUniform4fv( m_Uniforms.rglLightDiffuse, 1, diff );
if ( m_Uniforms.rglLightSpecular >= 0 )
glUniform4fv( m_Uniforms.rglLightSpecular, 1, spec );
if ( m_Uniforms.rglLightPosition >= 0 )
glUniform3fv( m_Uniforms.rglLightPosition, 1, pos );
}
void ON_GL( const ON_Light& light, GLenum light_index )
{
ON_BOOL32 bPopModelViewMatrix = false;
ON_BOOL32 bPopProjectionMatrix = false;
switch ( light.CoordinateSystem() )
{
case ON::world_cs:
break;
case ON::clip_cs:
bPopProjectionMatrix = true;
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
// no break here
case ON::camera_cs:
bPopModelViewMatrix = true;
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
break;
case ON::screen_cs:
break;
}
GLfloat ambient[4], diffuse[4], specular[4];
ON_GL( light.Ambient(), ambient );
ON_GL( light.Diffuse(), diffuse );
ON_GL( light.Specular(), specular );
glLightfv( light_index, GL_AMBIENT, ambient );
glLightfv( light_index, GL_DIFFUSE, diffuse );
glLightfv( light_index, GL_SPECULAR, specular );
ON_3dPoint loc = light.Location();
GLfloat f[4] = {(GLfloat)loc.x,(GLfloat)loc.y,(GLfloat)loc.z,(GLfloat)1.0};
glLightfv( light_index, GL_POSITION, f );
ON_3dVector dir = light.Direction();
f[0] = (GLfloat)dir.x;
f[1] = (GLfloat)dir.y;
f[2] = (GLfloat)dir.z;
glLightfv( light_index, GL_SPOT_DIRECTION, f );
glLightf( light_index, GL_SPOT_EXPONENT, (GLfloat)(light.SpotExponent()*128.0) );
glLightf( light_index, GL_SPOT_CUTOFF, (GLfloat)light.SpotAngleRadians() );
ON_3dVector attenuation = light.Attenuation();
glLightf( light_index, GL_CONSTANT_ATTENUATION, (GLfloat)attenuation.x );
glLightf( light_index, GL_LINEAR_ATTENUATION, (GLfloat)attenuation.y );
glLightf( light_index, GL_QUADRATIC_ATTENUATION, (GLfloat)attenuation.z );
if ( light.IsEnabled() )
glEnable( light_index );
else
glDisable( light_index );
if ( bPopProjectionMatrix ) {
glMatrixMode(GL_PROJECTION);
glPopMatrix();
}
if ( bPopModelViewMatrix ) {
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
}
}
