void RenderManager::Render( const Simulation &gameSim, const EngineConfig &engineCfg ) const
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); //clear the screen buffer
//render scene to fbo with active camera
glUseProgram( geometryPassShader.GetProgramHandler() );
glDepthMask( GL_TRUE ); //enable writing to the depth buffer
glEnable( GL_DEPTH_TEST );
BindDeferredFbo();
glEnable( GL_CULL_FACE );
glCullFace( GL_BACK );
//bind the surface texture and pass it to the shader
glActiveTexture( GL_TEXTURE0 );
glUniform1i( surfaceTextureId, 0 );
//render the simulation
ProjectionState cameraProjection = gameSim.RenderLit();
//ProjectionState cameraProjection = gameSim.RenderShadowCasters( gameSim.GetStaticLights()[2].GetCameras()[5] ); //for testing light cameras
int viewportMatrix[4];
float perspectiveMatrix[16];
cameraProjection.CopyViewportMatrix( viewportMatrix );
cameraProjection.CopyPerspectiveMatrix( perspectiveMatrix );
UnbindDeferredFbo();
glUseProgram( 0 );
//render depth buffer to fullscreen quad
glClear( GL_DEPTH_BUFFER_BIT );
OrthographicCamera orthoCamera( frmr::Vec3f(), frmr::Vec2f(), engineCfg.GetActiveWidth(), engineCfg.GetActiveHeight() );
orthoCamera.ApplyTransformation();
glUseProgram( depthTransferShader.GetProgramHandler() );
glActiveTexture( GL_TEXTURE0 );
glBindTexture( GL_TEXTURE_2D, depthTexture );
glUniform1i( depthId, 0 );
glCallList( fullscreenQuad );
glUseProgram( 0 );
glDepthMask( GL_FALSE ); //disable writing to the depth buffer
glDisable( GL_DEPTH_TEST );
//send all the textures, the viewport parameters and the perspective matrix to the deferred rendering shader
glUseProgram( lightPassShader.GetProgramHandler() );
glUniform1i( normalsId, 0 );
glUniform1i( diffuseId, 1 );
glUniform1i( depthId, 2 );
glUniform4iv( viewportParamsId, 4, viewportMatrix );
glUniformMatrix4fv( perspectiveMatrixId, 16, false, perspectiveMatrix );
glUseProgram( 0 );
glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
glEnable( GL_STENCIL_TEST );
glClearStencil( 0 );
//const vector<Light> staticLights;// = gameSim.GetStaticLights();
vector<Light> staticLights = gameSim.GetStaticLights();
PerspectiveCamera activeCamera = gameSim.GetActiveCamera();
glDisable( GL_BLEND );
for ( auto lightIt : staticLights )
{
//if light casts shadows
//for each face
//render face to fbo
if ( lightIt.CastsShadows() )
{
glBindFramebuffer( GL_FRAMEBUFFER, shadowFbo );
glViewport( 0, 0, 1024, 1024 );
glCullFace( GL_FRONT );
glUseProgram( shadowPassShader.GetProgramHandler() );
int cameraIndex = 0;
for ( auto camIt : lightIt.GetCameras() )
{
//if camera frustum intersects activeCamera frustum
glFramebufferTexture2D( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_CUBE_MAP_POSITIVE_X + cameraIndex++, shadowMap, 0 );
glClear( GL_DEPTH_BUFFER_BIT );
gameSim.RenderShadowCasters( camIt );
}
glUseProgram( 0 );
glBindFramebuffer( GL_FRAMEBUFFER, 0 );
}
glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE ); //disable writing to the color buffer
glStencilMask( 0xFF ); //enable writing to the stencil buffer
glClear( GL_STENCIL_BUFFER_BIT );
glStencilFunc( GL_NEVER, 1, 0xFF ); // never pass stencil test
glStencilOp( GL_REPLACE, GL_KEEP, GL_KEEP ); // replace stencil buffer values to ref=1
activeCamera.ApplyTransformation();
ResetViewport( engineCfg );
//render icosphere
glPushMatrix();
glTranslatef( lightIt.GetPosition().GetX(), lightIt.GetPosition().GetY(), lightIt.GetPosition().GetZ() );
glScalef( lightIt.GetRadius(), lightIt.GetRadius(), lightIt.GetRadius() );
glDisable( GL_CULL_FACE );
glDisable( GL_DEPTH_TEST ); //TODO: use the stencil buffer with depth fail and cull front face
glBindTexture( GL_TEXTURE_2D, 0 );
glCallList( icosphere );
glPopMatrix();
glDisable( GL_DEPTH_TEST );
//light only where the stencil buffer is equal to 1
glStencilFunc( GL_EQUAL, 1, 0xFF );
glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE ); //enable writing to the color buffer
glStencilMask( 0x00 ); //disable writing to the stencil buffer
orthoCamera.ApplyTransformation();
glDisable( GL_STENCIL_TEST );
glUseProgram( lightPassShader.GetProgramHandler() );
//pass the light's attributes to the shader
glUniform3f( lightPositionId, lightIt.GetPosition().GetX(), lightIt.GetPosition().GetY(), lightIt.GetPosition().GetZ() );
glUniform3f( lightColorId, lightIt.GetColor().GetX(), lightIt.GetColor().GetY(), lightIt.GetColor().GetZ() );
glUniform1f( lightLinearAttenuationId, lightIt.GetLinearAttenuation() );
glUniform1f( lightQuadraticAttenuationId, lightIt.GetQuadraticAttenuation() );
glUniform1i( shadowId, shadowMap );
glEnable( GL_TEXTURE_CUBE_MAP );
glBindTexture( GL_TEXTURE_CUBE_MAP, shadowMap );
glDisable( GL_CULL_FACE );
//enable blending so that each new quad adds to whatever's in the render buffer
glEnable( GL_BLEND );
glBlendFunc( GL_ONE, GL_ONE );
//bind the diffuse, normal and depth maps before rendering fullscreen quad
glActiveTexture( GL_TEXTURE0 );
glBindTexture( GL_TEXTURE_2D, normalsTexture );
glActiveTexture( GL_TEXTURE1 );
glBindTexture( GL_TEXTURE_2D, diffuseTexture );
glActiveTexture( GL_TEXTURE2 );
glBindTexture( GL_TEXTURE_2D, depthTexture );
glCallList( fullscreenQuad );
glDisable( GL_TEXTURE_CUBE_MAP );
glDisable( GL_BLEND );
glUseProgram( 0 );
}
glDisable(GL_STENCIL_TEST );
// Reset OpenGL state
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, 0);
//change to perspective projection
//enable depth test
//enable depth mask
//draw projectiles
//change to orthogonal projection
//disable depth test
//disable depth mask
//draw HUD
//draw UI
}
