Method render

testbed/src/SceneDemo.cpp:176–310

Render the scene (in multiple passes for shadow mapping)

// Render the scene (in multiple passes for shadow mapping)
void SceneDemo::render() {

    // Update the VBO for the debug infos
    updateDebugVBO();

    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);

    glClearColor(mBackgroundColor.r, mBackgroundColor.g, mBackgroundColor.b, mBackgroundColor.a);

	Matrix4 shadowMapProjMatrix[NB_SHADOW_MAPS];
	openglframework::Matrix4 worldToLightCameraMatrix[NB_SHADOW_MAPS];
	for (int i = 0; i < NB_SHADOW_MAPS; i++) {

		shadowMapProjMatrix[i] = mShadowMapLightCameras[i].getProjectionMatrix();
		worldToLightCameraMatrix[i] = mShadowMapLightCameras[i].getTransformMatrix().getInverse();
	}

    // ---------- Render the scene to generate the shadow map (first pass) ----------- //

    // If Shadow Mapping is enabled
    if (mIsShadowMappingEnabled) {

        // Culling switching, rendering only backface, this is done to avoid self-shadowing
        glCullFace(GL_BACK);

		// For each shadow map
		for (int i = 0; i < NB_SHADOW_MAPS; i++) {

			mFBOShadowMap[i].bind();

			// Bind the shader
			mDepthShader.bind();

			// Set the variables of the shader
			mDepthShader.setMatrix4x4Uniform("projectionMatrix", shadowMapProjMatrix[i]);

			// Set the viewport to render into the shadow map texture
			glViewport(0, 0, SHADOWMAP_WIDTH, SHADOWMAP_HEIGHT);

			// Clear previous frame values
			glClear(GL_DEPTH_BUFFER_BIT);

			// Disable color rendering, we only want to write to the Z-Buffer
			glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);

			// Render the objects of the scene
			renderSinglePass(mDepthShader, worldToLightCameraMatrix[i]);

			// Unbind the shader
			mDepthShader.unbind();

			mFBOShadowMap[i].unbind();
		}

        glDisable(GL_POLYGON_OFFSET_FILL);
    }