//
// Copyright 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// TextureGL.h: Defines the class interface for TextureGL.

#ifndef LIBANGLE_RENDERER_GL_TEXTUREGL_H_
#define LIBANGLE_RENDERER_GL_TEXTUREGL_H_

#include "libANGLE/angletypes.h"
#include "libANGLE/renderer/TextureImpl.h"
#include "libANGLE/Texture.h"

namespace rx
{

class BlitGL;
class FunctionsGL;
class StateManagerGL;
struct WorkaroundsGL;

struct LUMAWorkaroundGL
{
    bool enabled;
    GLenum workaroundFormat;

    LUMAWorkaroundGL();
    LUMAWorkaroundGL(bool enabled, GLenum workaroundFormat);
};

// Structure containing information about format and workarounds for each mip level of the
// TextureGL.
struct LevelInfoGL
{
    // Format of the data used in this mip level.
    GLenum sourceFormat;

    // If this mip level requires sampler-state re-writing so that only a red channel is exposed.
    bool depthStencilWorkaround;

    // Information about luminance alpha texture workarounds in the core profile.
    LUMAWorkaroundGL lumaWorkaround;

    LevelInfoGL();
    LevelInfoGL(GLenum sourceFormat,
                bool depthStencilWorkaround,
                const LUMAWorkaroundGL &lumaWorkaround);
};

class TextureGL : public TextureImpl
{
  public:
    TextureGL(const gl::TextureState &state,
              const FunctionsGL *functions,
              const WorkaroundsGL &workarounds,
              StateManagerGL *stateManager,
              BlitGL *blitter);
    ~TextureGL() override;

    gl::Error setImage(GLenum target, size_t level, GLenum internalFormat, const gl::Extents &size, GLenum format, GLenum type,
                       const gl::PixelUnpackState &unpack, const uint8_t *pixels) override;
    gl::Error setSubImage(GLenum target, size_t level, const gl::Box &area, GLenum format, GLenum type,
                          const gl::PixelUnpackState &unpack, const uint8_t *pixels) override;

    gl::Error setCompressedImage(GLenum target, size_t level, GLenum internalFormat, const gl::Extents &size,
                                 const gl::PixelUnpackState &unpack, size_t imageSize, const uint8_t *pixels) override;
    gl::Error setCompressedSubImage(GLenum target, size_t level, const gl::Box &area, GLenum format,
                                    const gl::PixelUnpackState &unpack, size_t imageSize, const uint8_t *pixels) override;

    gl::Error copyImage(GLenum target, size_t level, const gl::Rectangle &sourceArea, GLenum internalFormat,
                        const gl::Framebuffer *source) override;
    gl::Error copySubImage(GLenum target, size_t level, const gl::Offset &destOffset, const gl::Rectangle &sourceArea,
                           const gl::Framebuffer *source) override;

    gl::Error setStorage(GLenum target, size_t levels, GLenum internalFormat, const gl::Extents &size) override;

    gl::Error setImageExternal(GLenum target,
                               egl::Stream *stream,
                               const egl::Stream::GLTextureDescription &desc) override;

    gl::Error generateMipmap() override;

    void bindTexImage(egl::Surface *surface) override;
    void releaseTexImage() override;

    gl::Error setEGLImageTarget(GLenum target, egl::Image *image) override;

    void syncState(size_t textureUnit) const;
    GLuint getTextureID() const;

    gl::Error getAttachmentRenderTarget(const gl::FramebufferAttachment::Target &target,
                                        FramebufferAttachmentRenderTarget **rtOut) override
    {
        return gl::Error(GL_OUT_OF_MEMORY, "Not supported on OpenGL");
    }

    void setBaseLevel(GLuint) override {}

  private:
    void setImageHelper(GLenum target,
                        size_t level,
                        GLenum internalFormat,
                        const gl::Extents &size,
                        GLenum format,
                        GLenum type,
                        const uint8_t *pixels);
    void reserveTexImageToBeFilled(GLenum target,
                                   size_t level,
                                   GLenum internalFormat,
                                   const gl::Extents &size,
                                   GLenum format,
                                   GLenum type);
    gl::Error setSubImageRowByRowWorkaround(GLenum target,
                                            size_t level,
                                            const gl::Box &area,
                                            GLenum format,
                                            GLenum type,
                                            const gl::PixelUnpackState &unpack,
                                            const uint8_t *pixels);

    const FunctionsGL *mFunctions;
    const WorkaroundsGL &mWorkarounds;
    StateManagerGL *mStateManager;
    BlitGL *mBlitter;

    std::vector<LevelInfoGL> mLevelInfo;

    mutable gl::TextureState mAppliedTextureState;
    GLuint mTextureID;
};

}

#endif // LIBANGLE_RENDERER_GL_TEXTUREGL_H_