VkYcbcrSamplerHelper.h

Go to the documentation of this file.

/*
 * Copyright 2020 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef VkYcbcrSamplerHelper_DEFINED
#define VkYcbcrSamplerHelper_DEFINED
 
#include "include/core/SkTypes.h"
 
#ifdef SK_VULKAN
 
#if defined(SK_GRAPHITE)
#include "include/gpu/graphite/BackendTexture.h"
 
namespace skgpu::graphite {
class Recorder;
class VulkanSharedContext;
}
#endif
 
 
#include "include/gpu/GrBackendSurface.h"
#include "include/gpu/vk/GrVkTypes.h"
#include "include/gpu/vk/VulkanTypes.h"
 
class GrDirectContext;
class GrVkGpu;
 
// This helper will create and hold data for a Vulkan YCbCr backend texture. This format is
// particularly interesting because its sampler is immutable.
class VkYcbcrSamplerHelper {
public:
#if defined(SK_GRAPHITE)
    VkYcbcrSamplerHelper(const skgpu::graphite::VulkanSharedContext* ctxt,
                         VkPhysicalDevice physDev)
            : fSharedCtxt(ctxt)
            , fPhysDev(physDev) {
        SkASSERT(ctxt);
        fDContext = nullptr;
        fGrTexture = {};
    }
 
    const skgpu::graphite::BackendTexture& backendTexture() const { return fTexture; }
 
    bool createBackendTexture(uint32_t width, uint32_t height);
#endif
 
    VkYcbcrSamplerHelper(GrDirectContext*);
 
    const GrBackendTexture& grBackendTexture() const { return fGrTexture; }
 
    ~VkYcbcrSamplerHelper();
 
    bool isYCbCrSupported();
 
    bool createGrBackendTexture(uint32_t width, uint32_t height);
 
    static int GetExpectedY(int x, int y, int width, int height);
    static std::pair<int, int> GetExpectedUV(int x, int y, int width, int height);
 
private:
#if defined(SK_GRAPHITE)
    skgpu::graphite::BackendTexture             fTexture;
    const skgpu::graphite::VulkanSharedContext* fSharedCtxt;
    // Needed to query PhysicalDeviceFormatProperties for relevant VkFormat(s)
    VkPhysicalDevice                            fPhysDev;
#endif
 
    GrVkGpu* vkGpu();
 
    GrDirectContext* fDContext;
    GrBackendTexture fGrTexture;
 
    VkImage fImage = VK_NULL_HANDLE;
    VkDeviceMemory fImageMemory = VK_NULL_HANDLE;
};
 
#endif // SK_VULKAN
#endif // VkYcbcrSamplerHelper_DEFINED