Method DrawCubeMap

Source/Main/engine.cpp:3308–3368

}

void Engine::DrawCubeMap(TextureRef cube_map, const vec3& pos, GLuint cube_map_fbo, SceneGraph::SceneDrawType scene_draw_type) {
    GLuint cube_map_tex_id = Textures::Instance()->returnTexture(cube_map);
    Graphics* graphics = Graphics::Instance();
    CHECK_GL_ERROR();
    // TODO: Why do we have to render the first one twice? Some state is messed up
    for (int temp_i = -1; temp_i < 6; ++temp_i) {
        PROFILER_GPU_ZONE(g_profiler_ctx, "Draw cubemap face")
        int i = max(0, temp_i);
        graphics->startDraw(vec2(0.0f, 0.0f), vec2(128.0f, 128.0f), Graphics::kTexture);
        ActiveCameras::Set(1);
        CHECK_GL_ERROR();
        ActiveCameras::Get()->SetFlags(Camera::kPreviewCamera);
        // Apply camera object settings to camera
        Camera* camera = ActiveCameras::Instance()->Get();
        CHECK_GL_ERROR();
        // Set camera position
        camera->SetPos(pos);
        // Set camera euler angles from rotation matrix
        mat4 rot = GetCubeMapRotation(i);
        vec3 front = rot * vec3(0, 0, 1);
        vec3 up = rot * vec3(0, 1, 0);
        vec3 expected_right = normalize(cross(front, vec3(0, 1, 0)));
        vec3 expected_up = normalize(cross(expected_right, front));
        float cam[3];
        cam[0] = asinf(front[1]) * -180.0f / PI_f;
        cam[1] = atan2f(front[0], front[2]) * 180.0f / PI_f;
        cam[2] = atan2f(dot(up, expected_right), dot(up, expected_up)) * 180.0f / PI_f;
        // Set rotation twice so we don't have to worry about interpolation
        camera->SetXRotation(cam[0]);
        camera->SetXRotation(cam[0]);
        camera->SetYRotation(cam[1]);
        camera->SetYRotation(cam[1]);
        camera->SetZRotation(cam[2]);
        camera->SetZRotation(cam[2]);
        // Force true 90 degree fov
        camera->flexible_fov = false;
        camera->SetFOV(90.0f);
        camera->SetDistance(0.0f);
        // Draw view
        CHECK_GL_ERROR();
        DrawScene(kViewport, Engine::kStraight, SceneGraph::kStaticOnly);
        CHECK_GL_ERROR();
        scenegraph_->level->Draw();

        graphics->PushFramebuffer();
        glBindFramebuffer(GL_FRAMEBUFFER, cube_map_fbo);
        CHECK_GL_ERROR();
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, cube_map_tex_id, 0);
        CHECK_GL_ERROR();
        glBindFramebuffer(GL_READ_FRAMEBUFFER, graphics->framebuffer);
        CHECK_GL_ERROR();
        glBindFramebuffer(GL_DRAW_FRAMEBUFFER, cube_map_fbo);
        CHECK_GL_ERROR();
        glBlitFramebuffer(0, 0, 128, 128, 0, 0, 128, 128, GL_COLOR_BUFFER_BIT, GL_NEAREST);
        CHECK_GL_ERROR();
        graphics->PopFramebuffer();

        camera->flexible_fov = true;