Method begin

native/cocos/renderer/frame-graph/DevicePass.cpp:326–411

}

void DevicePass::begin(gfx::CommandBuffer *cmdBuff) {
    if (_attachments.empty()) return;

    gfx::RenderPassInfo rpInfo;
    gfx::FramebufferInfo fboInfo;
    float clearDepth = 1.F;
    uint32_t clearStencil = 0;
    static ccstd::vector<gfx::Color> clearColors;
    clearColors.clear();

    bool hasDefaultViewport{false};
    for (auto &subpass : _subpasses) {
        for (auto &pass : subpass.logicPasses) {
            if (!pass.customViewport) {
                hasDefaultViewport = true;
                break;
            }
        }
    }

    if (hasDefaultViewport) {
        _viewport = {};
        _scissor = {0, 0, UINT_MAX, UINT_MAX};
    } else { // if all passes use customize viewport
        _scissor = {INT_MAX, INT_MAX, 0, 0};

        for (auto &subpass : _subpasses) {
            for (auto &pass : subpass.logicPasses) {
                // calculate the union of all viewports as render area
                _viewport.left = _scissor.x = std::min(_scissor.x, pass.viewport.left);
                _viewport.top = _scissor.y = std::min(_scissor.y, pass.viewport.top);
                _viewport.width = _scissor.width = std::max(_scissor.width, pass.viewport.width + pass.viewport.left - _scissor.x);
                _viewport.height = _scissor.height = std::max(_scissor.height, pass.viewport.height + pass.viewport.top - _scissor.y);
            }
        }
    }

    for (const auto &attachElem : _attachments) {
        gfx::Texture *attachment = attachElem.renderTarget;
        if (attachElem.attachment.desc.usage == RenderTargetAttachment::Usage::COLOR) {
            rpInfo.colorAttachments.emplace_back();
            auto &attachmentInfo = rpInfo.colorAttachments.back();
            attachmentInfo.format = attachment->getFormat();
            attachmentInfo.loadOp = attachElem.attachment.desc.loadOp;
            attachmentInfo.storeOp = attachElem.attachment.storeOp;
            attachmentInfo.barrier = gfx::Device::getInstance()->getGeneralBarrier({attachElem.attachment.desc.beginAccesses, attachElem.attachment.desc.endAccesses});
            fboInfo.colorTextures.push_back(attachElem.renderTarget);
            clearColors.emplace_back(attachElem.attachment.desc.clearColor);
        } else {
            auto &attachmentInfo = rpInfo.depthStencilAttachment;
            attachmentInfo.format = attachment->getFormat();
            attachmentInfo.depthLoadOp = attachElem.attachment.desc.loadOp;
            attachmentInfo.stencilLoadOp = attachElem.attachment.desc.loadOp;
            attachmentInfo.depthStoreOp = attachElem.attachment.storeOp;
            attachmentInfo.stencilStoreOp = attachElem.attachment.storeOp;
            attachmentInfo.barrier = gfx::Device::getInstance()->getGeneralBarrier({attachElem.attachment.desc.beginAccesses, attachElem.attachment.desc.endAccesses});
            fboInfo.depthStencilTexture = attachElem.renderTarget;
            clearDepth = attachElem.attachment.desc.clearDepth;