void Sphere::draw( const std::string &_shaderName, ngl::TransformStack &_transformStack, const ngl::Mat4 &_globalTx, ngl::Camera *_cam )const
{
// draw wireframe if hit
if(m_hit)
{
glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
}
else
{
glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
}
ngl::ShaderLib *shader=ngl::ShaderLib::instance();
shader->use(_shaderName);
// grab an instance of the primitives for drawing
ngl::VAOPrimitives *prim=ngl::VAOPrimitives::instance();
_transformStack.pushTransform();
{
_transformStack.setPosition(m_pos);
_transformStack.setScale(m_radius,m_radius,m_radius);
loadMatricesToShader(_transformStack,_globalTx,_cam);
prim->draw("sphere");
} // and before a pop
_transformStack.popTransform();
glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
}
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";
}
}
//----------------------------------------------------------------------------------------------------------------------
// The SSAO pass.
// It uses the position and normal texture attachements.
// The result is blended in the texture 7 (COLOR_ATTACHEMENT7) which holds the final image
// The blending is done using the alpha channel since the ssao is outputed in the alpha channel in the shader.
//
void DeferredShading::generateSSAOPass(GLint &_shaderNumber,
ngl::TransformStack &_tx
)
{
// We attach our SSAO texture.
glDrawBuffer(GL_COLOR_ATTACHMENT7);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_posTex);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, m_normTex);
// The sample textures used in SSAO
glActiveTexture(GL_TEXTURE19);
// The sample texture loaded in the begining.
glBindTexture(GL_TEXTURE_2D,11);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendEquation(GL_FUNC_ADD);
// Blending the final image with the SSAO texture. In the shader we store the SSAO values as alpha.
glBlendFunc(GL_ONE, GL_SRC_ALPHA);
//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();
// Set the textures to be used.
shader->setShaderParam1i("PosTex", 0);
shader->setShaderParam1i("NormalTex", 2);
shader->setShaderParam1i("SampleTex", 19);
// Projection matrix
ngl::Mat3 ProjectionMatrix = m_camera->getProjectionMatrix();
shader->setShaderParamFromMat3("Projection",ProjectionMatrix);
// Set the screensize in order to use the correct TexCoords
shader->setShaderParam2f("gScreenSize", m_renderWidth, m_renderHeight);
_tx.pushTransform();
{
// transformation matrices
ngl::Mat4 MVP;
MVP.identity();
shader->setShaderParamFromMat4("MVP",MVP);
// Render the quad with the SSAO
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";
}
}