/*
 * Copyright 1993-2015 NVIDIA Corporation.  All rights reserved.
 *
 * Please refer to the NVIDIA end user license agreement (EULA) associated
 * with this source code for terms and conditions that govern your use of
 * this software. Any use, reproduction, disclosure, or distribution of
 * this software and related documentation outside the terms of the EULA
 * is strictly prohibited.
 *
 */

#ifndef NV_IMAGE_GL
#define NV_IMAGE_GL

#include <cuda.h>

#define HELPERGL_EXTERN_GL_FUNC_IMPLEMENTATION
#include <helper_gl.h>

#define PAD_ALIGN(x,mask) ( (x + mask) & ~mask )

#define USE_TEXTURE_RECT 1


#if USE_TEXTURE_RECT
#define GL_TEXTURE_TYPE GL_TEXTURE_RECTANGLE_ARB
// gl_shader_ for displaying floating-point texture
static const char *gl_shader_code =
    "!!ARBfp1.0\n"
    "TEX result.color, fragment.texcoord, texture[0], RECT; \n"
    "END";
#else
#define GL_TEXTURE_TYPE GL_TEXTURE_2D
// gl_shader_ for displaying floating-point texture
static const char *gl_shader_code =
    "!!ARBfp1.0\n"
    "TEX result.color, fragment.texcoord, texture[0], 2D; \n"
    "END";
#endif


const int Format2Bpp[] = { 1, 4, 0 };

class ImageGL
{
    public:
        enum PixelFormat
        {
            LUMINANCE_PIXEL_FORMAT,
            BGRA_PIXEL_FORMAT,
            UNKNOWN_PIXEL_FORMAT
        };

        ImageGL(unsigned int nDispWidth, unsigned int nDispHeight,
                unsigned int nTexWidth,  unsigned int nTexHeight,
                bool bIsProgressive,
                PixelFormat ePixelFormat = BGRA_PIXEL_FORMAT);

        // Destructor
        ~ImageGL();

        void
        registerAsCudaResource(int field_num);

        void
        unregisterAsCudaResource(int field_num);

        void
        setTextureFilterMode(GLuint nMINfilter, GLuint nMAGfilter);

        void
        setCUDAcontext(CUcontext oContext);

        void
        setCUDAdevice(CUdevice oDevice);

        int Bpp()
        {
            return Format2Bpp[(int)e_PixFmt_];
        }

        bool
        isCudaResource()
        const;

        // Map this image's DX surface into CUDA memory space.
        // Parameters:
        //      ppImageData - point to point to image data. On return this
        //          pointer references the mapped data.
        //      pImagePitch - pointer to image pitch. On return of this
        //          pointer contains the pitch of the mapped image surface.
        //      field_num   - optional, if we are going to deinterlace and display fields separately
        // Note:
        //      This method will fail, if this image is not a registered CUDA resource.
        void
        map(CUdeviceptr *ppImageData, size_t *pImagePitch, int field_num = 0);

        void
        unmap(int field_num = 0);

        // Clear the image.
        // Parameters:
        //      nClearColor - the luminance value to clear the image to. Default is white.
        // Note:
        //      This method will not work if this image is not registered as a CUDA resource at the
        //      time of this call.
        void
        clear(unsigned char nClearColor = 0xff);

        unsigned int
        nWidth()
        const
        {
            return nWidth_;
        }

        unsigned int
        nHeight()
        const
        {
            return nHeight_;
        }

        unsigned int
        nTexWidth()
        const
        {
            return nTexWidth_;
        }

        unsigned int
        nTexHeight()
        const
        {
            return nTexHeight_;
        }


        void
        render(int field_num)
        const;

        GLuint getPBO(int field_num = 0)
        {
            return gl_pbo_[field_num];
        }
        GLuint getTexID(int field_num = 0)
        {
            return gl_texid_[field_num];
        }

    private:
        GLuint gl_pbo_[2];     // OpenGL pixel buffer object
        GLuint gl_texid_[2];   // Texture resource for rendering
        GLuint gl_shader_;

        unsigned int nWidth_;
        unsigned int nHeight_;
        unsigned int nTexWidth_;
        unsigned int nTexHeight_;
        PixelFormat e_PixFmt_;
        bool bIsProgressive_;
        bool bIsCudaResource_;

        CUcontext oContext_;
        CUdevice  oDevice_;
};

#endif // IMAGE_GL

