cocos_lib/cocos/renderer/gfx-gles2/GLES2PrimaryCommandBuffer.cpp

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 Copyright (c) 2019-2023 Xiamen Yaji Software Co., Ltd.

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#include "GLES2Std.h"

#include "GLES2Buffer.h"
#include "GLES2Commands.h"
#include "GLES2DescriptorSet.h"
#include "GLES2Device.h"
#include "GLES2Framebuffer.h"
#include "GLES2InputAssembler.h"
#include "GLES2PipelineState.h"
#include "GLES2PrimaryCommandBuffer.h"
#include "GLES2RenderPass.h"
#include "GLES2Texture.h"
#include "profiler/Profiler.h"

namespace cc {
namespace gfx {

GLES2PrimaryCommandBuffer::~GLES2PrimaryCommandBuffer() {
    destroy();
}

void GLES2PrimaryCommandBuffer::begin(RenderPass * /*renderPass*/, uint32_t /*subpass*/, Framebuffer * /*frameBuffer*/) {
    _curGPUPipelineState = nullptr;
    _curGPUInputAssember = nullptr;
    _curGPUDescriptorSets.assign(_curGPUDescriptorSets.size(), nullptr);

    _numDrawCalls = 0;
    _numInstances = 0;
    _numTriangles = 0;
}

void GLES2PrimaryCommandBuffer::end() {
    if (_isStateInvalid) {
        bindStates();
    }
}

void GLES2PrimaryCommandBuffer::beginRenderPass(RenderPass *renderPass, Framebuffer *fbo, const Rect &renderArea, const Color *colors, float depth, uint32_t stencil, CommandBuffer *const * /*secondaryCBs*/, uint32_t /*secondaryCBCount*/) {
    _curSubpassIdx = 0U;

    GLES2GPURenderPass *gpuRenderPass = static_cast<GLES2RenderPass *>(renderPass)->gpuRenderPass();
    GLES2GPUFramebuffer *gpuFramebuffer = static_cast<GLES2Framebuffer *>(fbo)->gpuFBO();

    cmdFuncGLES2BeginRenderPass(GLES2Device::getInstance(), _curSubpassIdx, gpuRenderPass, gpuFramebuffer,
                                &renderArea, colors, depth, stencil);
    _curDynamicStates.viewport = {renderArea.x, renderArea.y, renderArea.width, renderArea.height};
    _curDynamicStates.scissor = renderArea;
}

void GLES2PrimaryCommandBuffer::endRenderPass() {
    cmdFuncGLES2EndRenderPass(GLES2Device::getInstance());
}

void GLES2PrimaryCommandBuffer::nextSubpass() {
    cmdFuncGLES2EndRenderPass(GLES2Device::getInstance());
    cmdFuncGLES2BeginRenderPass(GLES2Device::getInstance(), ++_curSubpassIdx);
}

void GLES2PrimaryCommandBuffer::insertMarker(const MarkerInfo &marker) {
    cmdFuncGLES2InsertMarker(GLES2Device::getInstance(), marker.name.size(), marker.name.data());
}

void GLES2PrimaryCommandBuffer::beginMarker(const MarkerInfo &marker) {
    cmdFuncGLES2PushGroupMarker(GLES2Device::getInstance(), marker.name.size(), marker.name.data());
}

void GLES2PrimaryCommandBuffer::endMarker() {
    cmdFuncGLES2PopGroupMarker(GLES2Device::getInstance());
}

void GLES2PrimaryCommandBuffer::draw(const DrawInfo &info) {
    CC_PROFILE(GLES2PrimaryCommandBufferDraw);
    if (_isStateInvalid) {
        ccstd::vector<uint32_t> &dynamicOffsetOffsets = _curGPUPipelineState->gpuPipelineLayout->dynamicOffsetOffsets;
        ccstd::vector<uint32_t> &dynamicOffsets = _curGPUPipelineState->gpuPipelineLayout->dynamicOffsets;
        for (size_t i = 0U; i < _curDynamicOffsets.size(); i++) {
            size_t count = dynamicOffsetOffsets[i + 1] - dynamicOffsetOffsets[i];
            // CC_ASSERT(_curDynamicOffsets[i].size() >= count);
            count = std::min(count, _curDynamicOffsets[i].size());
            if (count) memcpy(&dynamicOffsets[dynamicOffsetOffsets[i]], _curDynamicOffsets[i].data(), count * sizeof(uint32_t));
        }
        cmdFuncGLES2BindState(GLES2Device::getInstance(), _curGPUPipelineState, _curGPUInputAssember,
                              _curGPUDescriptorSets.data(), dynamicOffsets.data(), &_curDynamicStates);

        _isStateInvalid = false;
    }

    cmdFuncGLES2Draw(GLES2Device::getInstance(), info);

    ++_numDrawCalls;
    _numInstances += info.instanceCount;
    uint32_t indexCount = info.indexCount ? info.indexCount : info.vertexCount;
    if (_curGPUPipelineState) {
        switch (_curGPUPipelineState->glPrimitive) {
            case GL_TRIANGLES: {
                _numTriangles += indexCount / 3 * std::max(info.instanceCount, 1U);
                break;
            }
            case GL_TRIANGLE_STRIP:
            case GL_TRIANGLE_FAN: {
                _numTriangles += (indexCount - 2) * std::max(info.instanceCount, 1U);
                break;
            }
            default:
                break;
        }
    }
}

void GLES2PrimaryCommandBuffer::setViewport(const Viewport &vp) {
    auto *cache = GLES2Device::getInstance()->stateCache();
    if (cache->viewport != vp) {
        cache->viewport = vp;
        GL_CHECK(glViewport(vp.left, vp.top, vp.width, vp.height));
    }
}

void GLES2PrimaryCommandBuffer::setScissor(const Rect &rect) {
    auto *cache = GLES2Device::getInstance()->stateCache();
    if (cache->scissor != rect) {
        cache->scissor = rect;
        GL_CHECK(glScissor(rect.x, rect.y, rect.width, rect.height));
    }
}

void GLES2PrimaryCommandBuffer::updateBuffer(Buffer *buff, const void *data, uint32_t size) {
    GLES2GPUBuffer *gpuBuffer = static_cast<GLES2Buffer *>(buff)->gpuBuffer();
    if (gpuBuffer) {
        cmdFuncGLES2UpdateBuffer(GLES2Device::getInstance(), gpuBuffer, data, 0U, size);
    }
}

void GLES2PrimaryCommandBuffer::copyBuffersToTexture(const uint8_t *const *buffers, Texture *texture, const BufferTextureCopy *regions, uint32_t count) {
    GLES2GPUTexture *gpuTexture = static_cast<GLES2Texture *>(texture)->gpuTexture();
    if (gpuTexture) {
        cmdFuncGLES2CopyBuffersToTexture(GLES2Device::getInstance(), buffers, gpuTexture, regions, count);
    }
}

void GLES2PrimaryCommandBuffer::resolveTexture(Texture *srcTexture, Texture *dstTexture, const TextureCopy *regions, uint32_t count) {
    copyTexture(srcTexture, dstTexture, regions, count);
}

void GLES2PrimaryCommandBuffer::copyTexture(Texture *srcTexture, Texture *dstTexture, const TextureCopy *regions, uint32_t count) {
    GLES2GPUTexture *gpuTextureSrc = nullptr;
    GLES2GPUTexture *gpuTextureDst = nullptr;
    if (srcTexture) gpuTextureSrc = static_cast<GLES2Texture *>(srcTexture)->gpuTexture();
    if (dstTexture) gpuTextureDst = static_cast<GLES2Texture *>(dstTexture)->gpuTexture();
    ccstd::vector<TextureBlit> blitRegions(count);
    for (uint32_t i = 0; i < count; ++i) {
        auto &blit = blitRegions[i];
        const auto &copy = regions[i];

        blit.srcSubres = copy.srcSubres;
        blit.dstSubres = copy.dstSubres;

        blit.srcOffset = copy.srcOffset;
        blit.dstOffset = copy.dstOffset;

        blit.srcExtent = copy.extent;
        blit.dstExtent = copy.extent;
    }
    cmdFuncGLES2BlitTexture(GLES2Device::getInstance(), gpuTextureSrc, gpuTextureDst, blitRegions.data(), count, Filter::POINT);
}

void GLES2PrimaryCommandBuffer::blitTexture(Texture *srcTexture, Texture *dstTexture, const TextureBlit *regions, uint32_t count, Filter filter) {
    GLES2GPUTexture *gpuTextureSrc = nullptr;
    GLES2GPUTexture *gpuTextureDst = nullptr;
    if (srcTexture) gpuTextureSrc = static_cast<GLES2Texture *>(srcTexture)->gpuTexture();
    if (dstTexture) gpuTextureDst = static_cast<GLES2Texture *>(dstTexture)->gpuTexture();

    cmdFuncGLES2BlitTexture(GLES2Device::getInstance(), gpuTextureSrc, gpuTextureDst, regions, count, filter);
}

void GLES2PrimaryCommandBuffer::execute(CommandBuffer *const *cmdBuffs, uint32_t count) {
    for (uint32_t i = 0; i < count; ++i) {
        auto *cmdBuff = static_cast<GLES2PrimaryCommandBuffer *>(cmdBuffs[i]);

        if (!cmdBuff->_pendingPackages.empty()) {
            GLES2CmdPackage *cmdPackage = cmdBuff->_pendingPackages.front();

            cmdFuncGLES2ExecuteCmds(GLES2Device::getInstance(), cmdPackage);

            cmdBuff->_pendingPackages.pop();
            cmdBuff->_freePackages.push(cmdPackage);
            cmdBuff->_cmdAllocator->clearCmds(cmdPackage);
            cmdBuff->_cmdAllocator->reset();
        }

        _numDrawCalls += cmdBuff->_numDrawCalls;
        _numInstances += cmdBuff->_numInstances;
        _numTriangles += cmdBuff->_numTriangles;
    }
}

void GLES2PrimaryCommandBuffer::bindStates() {
    if (_curGPUPipelineState) {
        ccstd::vector<uint32_t> &dynamicOffsetOffsets = _curGPUPipelineState->gpuPipelineLayout->dynamicOffsetOffsets;
        ccstd::vector<uint32_t> &dynamicOffsets = _curGPUPipelineState->gpuPipelineLayout->dynamicOffsets;
        for (size_t i = 0U; i < _curDynamicOffsets.size(); i++) {
            size_t count = dynamicOffsetOffsets[i + 1] - dynamicOffsetOffsets[i];
            // CC_ASSERT(_curDynamicOffsets[i].size() >= count);
            count = std::min(count, _curDynamicOffsets[i].size());
            if (count) memcpy(&dynamicOffsets[dynamicOffsetOffsets[i]], _curDynamicOffsets[i].data(), count * sizeof(uint32_t));
        }
        cmdFuncGLES2BindState(GLES2Device::getInstance(), _curGPUPipelineState, _curGPUInputAssember, _curGPUDescriptorSets.data(), dynamicOffsets.data(), &_curDynamicStates);
    }
    _isStateInvalid = false;
}

} // namespace gfx
} // namespace cc