/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "src/gpu/vk/GrVkPipelineState.h"

#include "src/core/SkMipmap.h"
#include "src/gpu/GrPipeline.h"
#include "src/gpu/GrRenderTarget.h"
#include "src/gpu/GrTexture.h"
#include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
#include "src/gpu/glsl/GrGLSLGeometryProcessor.h"
#include "src/gpu/glsl/GrGLSLXferProcessor.h"
#include "src/gpu/vk/GrVkBuffer.h"
#include "src/gpu/vk/GrVkCommandBuffer.h"
#include "src/gpu/vk/GrVkDescriptorPool.h"
#include "src/gpu/vk/GrVkDescriptorSet.h"
#include "src/gpu/vk/GrVkGpu.h"
#include "src/gpu/vk/GrVkImageView.h"
#include "src/gpu/vk/GrVkMemory.h"
#include "src/gpu/vk/GrVkPipeline.h"
#include "src/gpu/vk/GrVkRenderTarget.h"
#include "src/gpu/vk/GrVkSampler.h"
#include "src/gpu/vk/GrVkTexture.h"

GrVkPipelineState::GrVkPipelineState(
            GrVkGpu* gpu,
            sk_sp<const GrVkPipeline> pipeline,
            const GrVkDescriptorSetManager::Handle& samplerDSHandle,
            const GrGLSLBuiltinUniformHandles& builtinUniformHandles,
            const UniformInfoArray& uniforms,
            uint32_t uniformSize,
            bool usePushConstants,
            const UniformInfoArray& samplers,
            std::unique_ptr<GrGLSLGeometryProcessor> geometryProcessor,
            std::unique_ptr<GrGLSLXferProcessor> xferProcessor,
            std::vector<std::unique_ptr<GrGLSLFragmentProcessor>> fpImpls)
        : fPipeline(std::move(pipeline))
        , fSamplerDSHandle(samplerDSHandle)
        , fBuiltinUniformHandles(builtinUniformHandles)
        , fGeometryProcessor(std::move(geometryProcessor))
        , fXferProcessor(std::move(xferProcessor))
        , fFPImpls(std::move(fpImpls))
        , fDataManager(uniforms, uniformSize, usePushConstants) {
    fNumSamplers = samplers.count();
    for (const auto& sampler : samplers.items()) {
        // We store the immutable samplers here and take a ref on the sampler. Once we switch to
        // using sk_sps here we should just move the immutable samplers to save the extra ref/unref.
        if (sampler.fImmutableSampler) {
            sampler.fImmutableSampler->ref();
        }
        fImmutableSamplers.push_back(sampler.fImmutableSampler);
    }
}

GrVkPipelineState::~GrVkPipelineState() {
    // Must have freed all GPU resources before this is destroyed
    SkASSERT(!fPipeline);
}

void GrVkPipelineState::freeGPUResources(GrVkGpu* gpu) {
    fPipeline.reset();
    fDataManager.releaseData();
    for (int i = 0; i < fImmutableSamplers.count(); ++i) {
        if (fImmutableSamplers[i]) {
            fImmutableSamplers[i]->unref();
            fImmutableSamplers[i] = nullptr;
        }
    }
}

bool GrVkPipelineState::setAndBindUniforms(GrVkGpu* gpu,
                                           const GrRenderTarget* renderTarget,
                                           const GrProgramInfo& programInfo,
                                           GrVkCommandBuffer* commandBuffer) {
    this->setRenderTargetState(renderTarget, programInfo.origin());

    fGeometryProcessor->setData(fDataManager, programInfo.geomProc());
    for (int i = 0; i < programInfo.pipeline().numFragmentProcessors(); ++i) {
        auto& fp = programInfo.pipeline().getFragmentProcessor(i);
        for (auto [fp, impl] : GrGLSLFragmentProcessor::ParallelRange(fp, *fFPImpls[i])) {
            impl.setData(fDataManager, fp);
        }
    }

    {
        SkIPoint offset;
        GrTexture* dstTexture = programInfo.pipeline().peekDstTexture(&offset);

        fXferProcessor->setData(fDataManager, programInfo.pipeline().getXferProcessor(),
                                dstTexture, offset);
    }

    // Upload uniform data and bind descriptor set.
    auto [uniformBuffer, success] = fDataManager.uploadUniforms(gpu, fPipeline->layout(),
                                                                commandBuffer);
    if (!success) {
        return false;
    }
    if (uniformBuffer) {
        const GrVkBuffer* vkBuffer = static_cast<GrVkBuffer*>(uniformBuffer.get());
        static const int kUniformDSIdx = GrVkUniformHandler::kUniformBufferDescSet;
        commandBuffer->bindDescriptorSets(gpu, fPipeline->layout(), kUniformDSIdx, /*setCount=*/1,
                                          vkBuffer->uniformDescriptorSet(),
                                          /*dynamicOffsetCount=*/0, /*dynamicOffsets=*/nullptr);
        commandBuffer->addGrBuffer(std::move(uniformBuffer));
    }
    return true;
}

bool GrVkPipelineState::setAndBindTextures(GrVkGpu* gpu,
                                           const GrGeometryProcessor& geomProc,
                                           const GrPipeline& pipeline,
                                           const GrSurfaceProxy* const geomProcTextures[],
                                           GrVkCommandBuffer* commandBuffer) {
    SkASSERT(geomProcTextures || !geomProc.numTextureSamplers());
    if (fNumSamplers) {
        struct SamplerBindings {
            GrSamplerState fState;
            GrVkTexture* fTexture;
        };
        SkAutoSTArray<8, SamplerBindings> samplerBindings(fNumSamplers);
        int currTextureBinding = 0;

        for (int i = 0; i < geomProc.numTextureSamplers(); ++i) {
            SkASSERT(geomProcTextures[i]->asTextureProxy());
            const auto& sampler = geomProc.textureSampler(i);
            auto texture = static_cast<GrVkTexture*>(geomProcTextures[i]->peekTexture());
            samplerBindings[currTextureBinding++] = {sampler.samplerState(), texture};
        }

        pipeline.visitTextureEffects([&](const GrTextureEffect& te) {
            GrSamplerState samplerState = te.samplerState();
            auto* texture = static_cast<GrVkTexture*>(te.texture());
            samplerBindings[currTextureBinding++] = {samplerState, texture};
        });

        if (GrTexture* dstTexture = pipeline.peekDstTexture()) {
            samplerBindings[currTextureBinding++] = {GrSamplerState::Filter::kNearest,
                                                     static_cast<GrVkTexture*>(dstTexture)};
        }

        // Get new descriptor set
        SkASSERT(fNumSamplers == currTextureBinding);
        static const int kSamplerDSIdx = GrVkUniformHandler::kSamplerDescSet;

        if (fNumSamplers == 1) {
            auto texture = samplerBindings[0].fTexture;
            auto texAttachment = texture->textureAttachment();
            const auto& samplerState = samplerBindings[0].fState;
            const GrVkDescriptorSet* descriptorSet = texture->cachedSingleDescSet(samplerState);
            if (descriptorSet) {
                commandBuffer->addGrSurface(sk_ref_sp<const GrSurface>(texture));
                commandBuffer->addResource(texAttachment->textureView());
                commandBuffer->addResource(texAttachment->resource());
                commandBuffer->addRecycledResource(descriptorSet);
                commandBuffer->bindDescriptorSets(gpu, fPipeline->layout(), kSamplerDSIdx,
                                                  /*setCount=*/1, descriptorSet->descriptorSet(),
                                                  /*dynamicOffsetCount=*/0,
                                                  /*dynamicOffsets=*/nullptr);
                return true;
            }
        }

        const GrVkDescriptorSet* descriptorSet =
                gpu->resourceProvider().getSamplerDescriptorSet(fSamplerDSHandle);
        if (!descriptorSet) {
            return false;
        }

        for (int i = 0; i < fNumSamplers; ++i) {
            GrSamplerState state = samplerBindings[i].fState;
            GrVkTexture* texture = samplerBindings[i].fTexture;
            auto texAttachment = texture->textureAttachment();

            const GrVkImageView* textureView = texAttachment->textureView();
            const GrVkSampler* sampler = nullptr;
            if (fImmutableSamplers[i]) {
                sampler = fImmutableSamplers[i];
            } else {
                sampler = gpu->resourceProvider().findOrCreateCompatibleSampler(
                        state, texAttachment->ycbcrConversionInfo());
            }
            SkASSERT(sampler);

            VkDescriptorImageInfo imageInfo;
            memset(&imageInfo, 0, sizeof(VkDescriptorImageInfo));
            imageInfo.sampler = fImmutableSamplers[i] ? VK_NULL_HANDLE : sampler->sampler();
            imageInfo.imageView = textureView->imageView();
            imageInfo.imageLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;

            VkWriteDescriptorSet writeInfo;
            memset(&writeInfo, 0, sizeof(VkWriteDescriptorSet));
            writeInfo.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
            writeInfo.pNext = nullptr;
            writeInfo.dstSet = *descriptorSet->descriptorSet();
            writeInfo.dstBinding = i;
            writeInfo.dstArrayElement = 0;
            writeInfo.descriptorCount = 1;
            writeInfo.descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
            writeInfo.pImageInfo = &imageInfo;
            writeInfo.pBufferInfo = nullptr;
            writeInfo.pTexelBufferView = nullptr;

            GR_VK_CALL(gpu->vkInterface(),
                       UpdateDescriptorSets(gpu->device(), 1, &writeInfo, 0, nullptr));
            commandBuffer->addResource(sampler);
            if (!fImmutableSamplers[i]) {
                sampler->unref();
            }
            commandBuffer->addResource(textureView);
            commandBuffer->addResource(texAttachment->resource());
        }
        if (fNumSamplers == 1) {
            GrSamplerState state = samplerBindings[0].fState;
            GrVkTexture* texture = samplerBindings[0].fTexture;
            texture->addDescriptorSetToCache(descriptorSet, state);
        }

        commandBuffer->bindDescriptorSets(gpu, fPipeline->layout(), kSamplerDSIdx, /*setCount=*/1,
                                          descriptorSet->descriptorSet(),
                                          /*dynamicOffsetCount=*/0, /*dynamicOffsets=*/nullptr);
        commandBuffer->addRecycledResource(descriptorSet);
        descriptorSet->recycle();
    }
    return true;
}

bool GrVkPipelineState::setAndBindInputAttachment(GrVkGpu* gpu,
                                                  GrVkRenderTarget* renderTarget,
                                                  GrVkCommandBuffer* commandBuffer) {
    SkASSERT(renderTarget->colorAttachment()->supportsInputAttachmentUsage());
    const GrVkDescriptorSet* descriptorSet = renderTarget->inputDescSet(gpu, /*forResolve=*/false);

    if (!descriptorSet) {
        return false;
    }
    commandBuffer->bindDescriptorSets(gpu, fPipeline->layout(), GrVkUniformHandler::kInputDescSet,
                                      /*setCount=*/1, descriptorSet->descriptorSet(),
                                      /*dynamicOffsetCount=*/0, /*dynamicOffsets=*/nullptr);
    // We don't add the input resource to the command buffer to track since the input will be
    // the same as the color attachment which is already tracked on the command buffer.
    commandBuffer->addRecycledResource(descriptorSet);
    return true;
}

void GrVkPipelineState::setRenderTargetState(const GrRenderTarget* rt, GrSurfaceOrigin origin) {

    // Load the RT height uniform if it is needed to y-flip gl_FragCoord.
    if (fBuiltinUniformHandles.fRTHeightUni.isValid() &&
        fRenderTargetState.fRenderTargetSize.fHeight != rt->height()) {
        fDataManager.set1f(fBuiltinUniformHandles.fRTHeightUni, SkIntToScalar(rt->height()));
    }

    // set RT adjustment
    SkISize dimensions = rt->dimensions();
    SkASSERT(fBuiltinUniformHandles.fRTAdjustmentUni.isValid());
    if (fRenderTargetState.fRenderTargetOrigin != origin ||
        fRenderTargetState.fRenderTargetSize != dimensions) {
        fRenderTargetState.fRenderTargetSize = dimensions;
        fRenderTargetState.fRenderTargetOrigin = origin;

        float rtAdjustmentVec[4];
        fRenderTargetState.getRTAdjustmentVec(rtAdjustmentVec);
        fDataManager.set4fv(fBuiltinUniformHandles.fRTAdjustmentUni, 1, rtAdjustmentVec);
    }
}

void GrVkPipelineState::bindPipeline(const GrVkGpu* gpu, GrVkCommandBuffer* commandBuffer) {
    commandBuffer->bindPipeline(gpu, fPipeline);
}