void DeferredShading::deferredDirectionalLight(
GLint &_shaderNumber,
ngl::TransformStack &_tx,
GLint &_lightIndex
)
{
glDrawBuffer(GL_COLOR_ATTACHMENT7);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_posTex);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, m_normTex);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, m_colorTex);
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, m_tangentTex);
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_2D, m_binormalTex);
glActiveTexture(GL_TEXTURE5);
glBindTexture(GL_TEXTURE_2D, m_normalMapTex);
glActiveTexture(GL_TEXTURE6);
glBindTexture(GL_TEXTURE_2D, m_specularTex);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_ONE, GL_ONE);
if((_shaderNumber <= m_shaderNumber) && (_shaderNumber >= 0))
{
// Set our shader as active
ngl::ShaderLib *shader=ngl::ShaderLib::instance();
m_deferredShader[_shaderNumber]->setShaderAsActive();
// Making the light stay fixed relative to the world.
// This is the only way to make it "stick". Multiplying by the transpose matrix doesn't work for unknown reasons...
ngl::Vec4 m_currPos = m_deferredShader[_shaderNumber]->m_light[_lightIndex]->getPos();
ngl::Mat4 globalMV = _tx.getGlobalTransform().getMatrix() * m_camera->getViewMatrix();
// For rotation
m_currPos = m_currPos * globalMV;
// For position
m_currPos.m_x = m_currPos.m_x + globalMV.m_30;
m_currPos.m_y = m_currPos.m_y + globalMV.m_31;
m_currPos.m_z = m_currPos.m_z + globalMV.m_32;
ngl::Vec4 result = ngl::Vec4(m_currPos.m_x, m_currPos.m_y, m_currPos.m_z, m_currPos.m_w);
// load these values to the shader as well
m_deferredShader[_shaderNumber]->m_light[_lightIndex]->loadToShader("light");
shader->setShaderParam4f("light.position",result.m_x, result.m_y, result.m_z, result.m_w);
shader->setShaderParam2f("gScreenSize", m_renderWidth, m_renderHeight);
_tx.pushTransform();
{
// transformation matrices
ngl::Mat4 MVP;
MVP.identity();
shader->setShaderParamFromMat4("MVP",MVP);
// Render the quad
glBindVertexArray(m_quad);
glDrawArrays(GL_TRIANGLES, 0, 6);
glDisable(GL_BLEND);
}
_tx.popTransform();
}
else
{
std::cout<<"The shader with number "<< _shaderNumber<<" doesn't exist. Cannot render with an unknown shader! \n";
}
}
