Method pbr_renderer

libraries/lib-engine/src/renderer-pbr.cpp:479–551

}

pbr_renderer::pbr_renderer(const renderer_settings settings) : settings(settings)
{
    assert(settings.renderSize.x > 0 && settings.renderSize.y > 0);
    assert(settings.cameraCount >= 1);

    post_quad = make_fullscreen_quad();
    cubemap_box = make_cube_mesh();

    eyeFramebuffers.resize(settings.cameraCount);
    eyeTextures.resize(settings.cameraCount);
    eyeDepthTextures.resize(settings.cameraCount);

    // Generate multisample render buffers for color and depth, attach to multi-sampled framebuffer target
    glNamedRenderbufferStorageMultisample(multisampleRenderbuffers[0], settings.msaaSamples, GL_RGBA16F, settings.renderSize.x, settings.renderSize.y);
    glNamedFramebufferRenderbuffer(multisampleFramebuffer, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, multisampleRenderbuffers[0]);
    glNamedRenderbufferStorageMultisample(multisampleRenderbuffers[1], settings.msaaSamples, GL_DEPTH24_STENCIL8, settings.renderSize.x, settings.renderSize.y);
    glNamedFramebufferRenderbuffer(multisampleFramebuffer, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, multisampleRenderbuffers[1]);

    multisampleFramebuffer.check_complete();

    // Generate textures and framebuffers for |settings.cameraCount|
    for (uint32_t camIdx = 0; camIdx < settings.cameraCount; ++camIdx)
    {
        // Depth
        eyeDepthTextures[camIdx].setup(settings.renderSize.x, settings.renderSize.y, GL_DEPTH_COMPONENT32, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);

        // Color (16-bit float for HDR precision, eliminates banding on smooth gradients)
        eyeTextures[camIdx].setup(settings.renderSize.x, settings.renderSize.y, GL_RGBA16F, GL_RGBA, GL_FLOAT, nullptr, false);
        glTextureParameteri(eyeTextures[camIdx], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTextureParameteri(eyeTextures[camIdx], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        glTextureParameteri(eyeTextures[camIdx], GL_TEXTURE_MAX_LEVEL, 0);

        // Attachments
        glNamedFramebufferTexture(eyeFramebuffers[camIdx], GL_COLOR_ATTACHMENT0, eyeTextures[camIdx], 0);
        glNamedFramebufferTexture(eyeFramebuffers[camIdx], GL_DEPTH_ATTACHMENT, eyeDepthTextures[camIdx], 0);

        eyeFramebuffers[camIdx].check_complete();
    }

    if (settings.tonemapEnabled)
    {
        postFramebuffers.resize(settings.cameraCount);
        postTextures.resize(settings.cameraCount);

        for (uint32_t camIdx = 0; camIdx < settings.cameraCount; ++camIdx)
        {
            postTextures[camIdx].setup(settings.renderSize.x, settings.renderSize.y, GL_RGBA, GL_RGBA, GL_FLOAT, nullptr, false);
            glTextureParameteri(postTextures[camIdx], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
            glTextureParameteri(postTextures[camIdx], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
            glTextureParameteri(postTextures[camIdx], GL_TEXTURE_MAX_LEVEL, 0);
            glNamedFramebufferTexture(postFramebuffers[camIdx], GL_COLOR_ATTACHMENT0, postTextures[camIdx], 0);
            postFramebuffers[camIdx].check_complete();
        }
    }

    gl_check_error(__FILE__, __LINE__);

    // Only create shadow resources if the user has requested them.