Main file shadow stuff

[ggetz]

Initialization

GLuint _depthBuffer;
GLuint _shadowMap;
GLuint _shadowMapSize = 1024;

//----------------------------------------------------------------------------

void initShadowMapping()
{
    glGenFramebuffers(1, &_depthBuffer);
    glGenTextures(1, &_shadowMap);

    glBindTexture(GL_TEXTURE_2D, _shadowMap);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, _shadowMapSize, _shadowMapSize, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);

    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
}

// OpenGL initialization
void init()
{
    camera1 = Camera(true, vec4(0.0, 2.0, 0.0, 1.0));

    sun = DirectionalLight();
    sun.shadow = (vec4(0.5, 0.5, 0.7, 1.0));

    Material m = Material();
    m.texturePath = texture1;
    m.ambient = vec4(0.5, 0.5, 0.5, 1.0);
    m.diffuse = vec4(0.8, 0.8, 0.8, 1.0);
    cube = new Cube();
    cube->setMaterial(m);
    cube->setPosition(vec4(0, 0.5, -7, 1));
    meshes.push_back(cube);

    // Init other meshes

    for (auto &mesh : meshes)
    {
        mesh->init();
    }

    initShadowMapping();

    glClearColor( 0.8, 0.9, 1.0, 1.0 );
}

Rendering

void generateShadowMap()
{
    glBindFramebuffer(GL_FRAMEBUFFER, _depthBuffer);
    glViewport(0, 0, _shadowMapSize, _shadowMapSize);

    glDrawBuffer(GL_NONE);
    glReadBuffer(GL_NONE);

    glBindTexture(GL_TEXTURE_2D, _shadowMap);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, _shadowMap, 0);
    glClear(GL_DEPTH_BUFFER_BIT);

    for (auto &mesh : meshes)
    {
        if (mesh != plane) // don't have the ground plan cast shadows
        {
            mesh->drawShadowMap(sun);
        }
    }

    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glViewport(0, 0, windowSize.x, windowSize.y);
}

void display( void )
{
    // SHADOW PASS

    glCullFace(GL_FRONT);

    generateShadowMap();

    glCullFace(GL_NONE);

    // RENDER PASS

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    for (auto &mesh : meshes)
    {
        mesh->draw(camera1, sun, _shadowMap);
    }

    glFlush();
}