//
// Main drawing function. Renders a completed scene to the screen.
//
void Renderer::drawScene(Scene& scene, Camera& camera)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |
GL_STENCIL_BUFFER_BIT);
// Load the viewing translations.
resize(global.winWidth, global.winHeight);
glLoadMatrix(camera.getWorldToCamMatrix());
// Unlit scene + Depth Buffer info.
ambientPass(scene, camera);
// Only enter this loop if ambient only is not enabled.
if (!global.drawAmbientOnly)
{
// The rest of the rendering is done on a 'per-light' basis, shadows are
// determined for each light and the scene is additively illuminated.
for (int i = 0; i < scene.lights.size(); ++i)
{
if (i >= global.maxVisibleLights) break;
Light& light = scene.lights[i];
// Setup the light for drawing and draw it.
setupLight(light);
if (global.drawPointLights)
drawLight(light);
// Determine shadows and light the scene.
if (global.drawShadows)
{
determineShadows(scene.casters, light, camera);
}
// Iluminate the scene fro this light.
illuminationPass(scene, camera);
glClear(GL_STENCIL_BUFFER_BIT);
}
scene.dirtyAllCasters();
}
// Check for OpenGL errors.
int er = glGetError();
if (er) printf("%s\n", gluErrorString(er));
}
void MyView::
windowViewRender(std::shared_ptr<tygra::Window> window)
{
assert(scene_ != nullptr);
updateBuffers(); //update positions of meshes and light sources
geometryPass(); //must be done first to write to g-buffer
glUseProgram(shadowMap_program_);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, shadowMap_fbo_);
glClear(GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
GLuint lightPVLocation = glGetUniformLocation(shadowMap_program_, "lightPV");
glViewport(0, 0, 1024, 1024);
int i;
for (i = 0; i < spotLightCount_; i++){
//generate shadow maps for spot
float far = scene_->getCamera().getFarPlaneDistance();
float near = scene_->getCamera().getNearPlaneDistance();
glm::vec3 lightPos = scene_->getAllSpotLights()[i].getPosition();
glm::vec3 lightLookAt = scene_->getAllSpotLights()[i].getDirection() - lightPos;
float fov = scene_->getAllSpotLights()[i].getConeAngleDegrees();
glm::mat4 view_xform = glm::lookAt(lightPos, lightLookAt, upDir_);
glm::mat4 projection = glm::perspective(fov, 1.0f, near, far);
glm::mat4 lightPV = projection * view_xform;
glUniformMatrix4fv(lightPVLocation, 1, GL_FALSE, glm::value_ptr(lightPV));
glFramebufferTextureLayer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, shadowMap_tex_, 0, i);
Mesh mesh;
for (int i = 0; i < meshes_.size(); i++)
{
mesh = meshes_[i];
glBindVertexArray(mesh.vao);
glDrawElementsInstanced(GL_TRIANGLES, mesh.element_count, GL_UNSIGNED_INT, 0, mesh.instanceIDs.size());
}
}
glViewport(0, 0, width_, height_);
ambientPass();
directionalLightPass(); //must be done after ambient and before point, as the quad vao is bound in ambient pass
//pointlightPass();
glCullFace(GL_FRONT);
//point lights
//glEnable(GL_DEPTH_TEST);
//glDepthFunc(GL_GREATER);
//bind the sphere mesh, used by point and spot lights
glBindVertexArray(light_sphere_mesh_.vao);
spotlightPass(); //must be done after point lights, as the sphere vao is bound in point light pass
//apply SSMAA to the image
antiAliasingPasses();
//blit l-buffer to screen
glBindFramebuffer(GL_READ_FRAMEBUFFER, lbuffer_fbo_);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, width_, height_, 0, 0, width_, height_, GL_COLOR_BUFFER_BIT, GL_LINEAR);
}
