/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

#if SDL_VIDEO_OPENGL

#include "SDL_video.h"

#include "SDL_opengl.h"

#include "SDL_sysvideo.h"

#include "SDL_pixels_c.h"

#include "SDL_rect_c.h"

#include "SDL_yuv_sw_c.h"

/* OpenGL renderer implementation */

static SDL_Renderer *GL_CreateRenderer(SDL_Window * window, Uint32 flags);

static int GL_ActivateRenderer(SDL_Renderer * renderer);

static int GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static int GL_SetTexturePalette(SDL_Renderer * renderer,

                                SDL_Texture * texture,

                                const SDL_Color * colors, int firstcolor,

                                int ncolors);

static int GL_GetTexturePalette(SDL_Renderer * renderer,

                                SDL_Texture * texture, SDL_Color * colors,

                                int firstcolor, int ncolors);

static int GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

                            const SDL_Rect * rect, const void *pixels,

                            int pitch);

static int GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

                          const SDL_Rect * rect, int markDirty,

                          void **pixels, int *pitch);

static void GL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static void GL_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,

                            int numrects, const SDL_Rect * rects);

static int GL_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect,

                         Uint32 color);

static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,

                         const SDL_Rect * srcrect, const SDL_Rect * dstrect,

                         int blendMode, int scaleMode);

static void GL_RenderPresent(SDL_Renderer * renderer);

static void GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static void GL_DestroyRenderer(SDL_Renderer * renderer);

SDL_RenderDriver GL_RenderDriver = {

    GL_CreateRenderer,

    {

     "opengl",

     (SDL_Renderer_PresentDiscard | SDL_Renderer_PresentVSync |

      SDL_Renderer_Accelerated),

     (SDL_TextureBlendMode_None | SDL_TextureBlendMode_Mask |

      SDL_TextureBlendMode_Blend | SDL_TextureBlendMode_Add |

      SDL_TextureBlendMode_Mod),

     (SDL_TextureScaleMode_None | SDL_TextureScaleMode_Fast |

      SDL_TextureScaleMode_Slow),

     16,

     {

      SDL_PixelFormat_Index1LSB,

      SDL_PixelFormat_Index1MSB,

      SDL_PixelFormat_Index8,

      SDL_PixelFormat_RGB332,

      SDL_PixelFormat_RGB444,

      SDL_PixelFormat_RGB555,

      SDL_PixelFormat_ARGB4444,

      SDL_PixelFormat_ARGB1555,

      SDL_PixelFormat_RGB565,

      SDL_PixelFormat_RGB24,

      SDL_PixelFormat_BGR24,

      SDL_PixelFormat_RGB888,

      SDL_PixelFormat_BGR888,

      SDL_PixelFormat_ARGB8888,

      SDL_PixelFormat_ABGR8888,

      SDL_PixelFormat_ARGB2101010},

     0,

     0}

};

typedef struct

{

    SDL_GLContext context;

    SDL_bool GL_ARB_texture_rectangle_supported;

    int blendMode;

    int scaleMode;

    /* OpenGL functions */

#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;

#include "SDL_glfuncs.h"

#undef SDL_PROC

} GL_RenderData;

typedef struct

{

    GLuint texture;

    GLenum type;

    GLfloat texw;

    GLfloat texh;

    GLenum format;

    GLenum formattype;

    void *pixels;

    int pitch;

    SDL_DirtyRectList dirty;

} GL_TextureData;

static void

GL_SetError(const char *prefix, GLenum result)

{

    const char *error;

    switch (result) {

    case GL_NO_ERROR:

        error = "GL_NO_ERROR";

        break;

    case GL_INVALID_ENUM:

        error = "GL_INVALID_ENUM";

        break;

    case GL_INVALID_VALUE:

        error = "GL_INVALID_VALUE";

        break;

    case GL_INVALID_OPERATION:

        error = "GL_INVALID_OPERATION";

        break;

    case GL_STACK_OVERFLOW:

        error = "GL_STACK_OVERFLOW";

        break;

    case GL_STACK_UNDERFLOW:

        error = "GL_STACK_UNDERFLOW";

        break;

    case GL_OUT_OF_MEMORY:

        error = "GL_OUT_OF_MEMORY";

        break;

    case GL_TABLE_TOO_LARGE:

        error = "GL_TABLE_TOO_LARGE";

        break;

    default:

        error = "UNKNOWN";

        break;

    }

    SDL_SetError("%s: %s", prefix, error);

}

static int

GL_LoadFunctions(GL_RenderData * data)

{

#if defined(__QNXNTO__) && (_NTO_VERSION < 630)

#define __SDL_NOGETPROCADDR__

#elif defined(__MINT__)

#define __SDL_NOGETPROCADDR__

#endif

#ifdef __SDL_NOGETPROCADDR__

#define SDL_PROC(ret,func,params) data->func=func;

#else

#define SDL_PROC(ret,func,params) \

    do { \

        data->func = SDL_GL_GetProcAddress(#func); \

        if ( ! data->func ) { \

            SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \

            return -1; \

        } \

    } while ( 0 );

#endif /* __SDL_NOGETPROCADDR__ */

#include "SDL_glfuncs.h"

#undef SDL_PROC

    return 0;

}

void

GL_AddRenderDriver(_THIS)

{

    if (_this->GL_CreateContext) {

        SDL_AddRenderDriver(0, &GL_RenderDriver);

    }

}

SDL_Renderer *

GL_CreateRenderer(SDL_Window * window, Uint32 flags)

{

    SDL_Renderer *renderer;

    GL_RenderData *data;

    if (!(window->flags & SDL_WINDOW_OPENGL)) {

            return NULL;

        }

    }

    renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));

    if (!renderer) {

        SDL_OutOfMemory();

        return NULL;

    }

    data = (GL_RenderData *) SDL_calloc(1, sizeof(*data));

    if (!data) {

        GL_DestroyRenderer(renderer);

        SDL_OutOfMemory();

        return NULL;

    }

    renderer->ActivateRenderer = GL_ActivateRenderer;

    renderer->CreateTexture = GL_CreateTexture;

    renderer->SetTexturePalette = GL_SetTexturePalette;

    renderer->GetTexturePalette = GL_GetTexturePalette;

    renderer->UpdateTexture = GL_UpdateTexture;

    renderer->LockTexture = GL_LockTexture;

    renderer->UnlockTexture = GL_UnlockTexture;

    renderer->DirtyTexture = GL_DirtyTexture;

    renderer->RenderFill = GL_RenderFill;

    renderer->RenderCopy = GL_RenderCopy;

    renderer->RenderPresent = GL_RenderPresent;

    renderer->DestroyTexture = GL_DestroyTexture;

    renderer->DestroyRenderer = GL_DestroyRenderer;

    renderer->info = GL_RenderDriver.info;

    renderer->window = window->id;

    renderer->driverdata = data;

    renderer->info.flags =

        (SDL_Renderer_PresentDiscard | SDL_Renderer_Accelerated);

    if (GL_LoadFunctions(data) < 0) {

        GL_DestroyRenderer(renderer);

        return NULL;

    }

    data->context = SDL_GL_CreateContext(window->id);

    if (!data->context) {

        GL_DestroyRenderer(renderer);

        return NULL;

    }

    if (SDL_GL_MakeCurrent(window->id, data->context) < 0) {

        GL_DestroyRenderer(renderer);

        return NULL;

    }

    if (flags & SDL_Renderer_PresentVSync) {

        SDL_GL_SetSwapInterval(1);

    } else {

        SDL_GL_SetSwapInterval(0);

    }

    if (SDL_GL_GetSwapInterval() > 0) {

        renderer->info.flags |= SDL_Renderer_PresentVSync;

    }

    data->glGetIntegerv(GL_MAX_TEXTURE_SIZE,

                        &renderer->info.max_texture_width);

    data->glGetIntegerv(GL_MAX_TEXTURE_SIZE,

                        &renderer->info.max_texture_height);

    if (SDL_GL_ExtensionSupported("GL_ARB_texture_rectangle")

        || SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle")) {

        data->GL_ARB_texture_rectangle_supported = SDL_TRUE;

    }

    /* Set up parameters for rendering */

    data->blendMode = -1;

    data->scaleMode = -1;

    data->glDisable(GL_DEPTH_TEST);

    data->glDisable(GL_CULL_FACE);

    if (data->GL_ARB_texture_rectangle_supported) {

        data->glEnable(GL_TEXTURE_RECTANGLE_ARB);

    } else {

        data->glEnable(GL_TEXTURE_2D);

    }

    data->glMatrixMode(GL_PROJECTION);

    data->glLoadIdentity();

    data->glMatrixMode(GL_MODELVIEW);

    data->glLoadIdentity();

    data->glViewport(0, 0, window->w, window->h);

    data->glOrtho(0.0, (GLdouble) window->w, (GLdouble) window->h, 0.0, 0.0,

                  1.0);

    return renderer;

}

static int

GL_ActivateRenderer(SDL_Renderer * renderer)

{

    GL_RenderData *data = (GL_RenderData *) renderer->driverdata;

    SDL_Window *window = SDL_GetWindowFromID(renderer->window);

    return SDL_GL_MakeCurrent(window->id, data->context);

}

static __inline__ int

power_of_2(int input)

{

    int value = 1;

    while (value < input) {

        value <<= 1;

    }

    return value;

}

static int

GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

    GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

    SDL_Window *window = SDL_GetWindowFromID(renderer->window);

    GL_TextureData *data;

    GLint internalFormat;

    GLenum format, type;

    int texture_w, texture_h;

    GLenum result;

    switch (texture->format) {

    case SDL_PixelFormat_Index1LSB:

    case SDL_PixelFormat_Index1MSB:

        internalFormat = GL_RGB;

        format = GL_COLOR_INDEX;

        type = GL_BITMAP;

        break;

    case SDL_PixelFormat_Index8:

        internalFormat = GL_RGB;

        format = GL_COLOR_INDEX;

        type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PixelFormat_RGB332:

        internalFormat = GL_R3_G3_B2;

        format = GL_RGB;

        type = GL_UNSIGNED_BYTE_3_3_2;

        break;

    case SDL_PixelFormat_RGB444:

        internalFormat = GL_RGB4;

        format = GL_RGB;

        type = GL_UNSIGNED_SHORT_4_4_4_4;

        break;

    case SDL_PixelFormat_RGB555:

        internalFormat = GL_RGB5;

        format = GL_RGB;

        type = GL_UNSIGNED_SHORT_5_5_5_1;

        break;

    case SDL_PixelFormat_ARGB4444:

        internalFormat = GL_RGBA4;

        format = GL_BGRA;

        type = GL_UNSIGNED_SHORT_4_4_4_4_REV;

        break;

    case SDL_PixelFormat_ARGB1555:

        internalFormat = GL_RGB5_A1;

        format = GL_BGRA;

        type = GL_UNSIGNED_SHORT_1_5_5_5_REV;

        break;

    case SDL_PixelFormat_RGB565:

        internalFormat = GL_RGB8;

        format = GL_RGB;

        type = GL_UNSIGNED_SHORT_5_6_5;

        break;

    case SDL_PixelFormat_RGB24:

        internalFormat = GL_RGB8;

        format = GL_RGB;

        type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PixelFormat_RGB888:

        internalFormat = GL_RGB8;

        format = GL_BGRA;

        type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PixelFormat_BGR24:

        internalFormat = GL_RGB8;

        format = GL_BGR;

        type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PixelFormat_BGR888:

        internalFormat = GL_RGB8;

        format = GL_RGBA;

        type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PixelFormat_ARGB8888:

        internalFormat = GL_RGBA8;

        format = GL_BGRA;

        type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PixelFormat_ABGR8888:

        internalFormat = GL_RGBA8;

        format = GL_RGBA;

        type = GL_UNSIGNED_BYTE;

        break;

    case SDL_PixelFormat_ARGB2101010:

        internalFormat = GL_RGB10_A2;

        format = GL_BGRA;

        type = GL_UNSIGNED_INT_2_10_10_10_REV;

        break;

    default:

        SDL_SetError("Unsupported texture format");

        return -1;

    }

    data = (GL_TextureData *) SDL_calloc(1, sizeof(*data));

    if (!data) {

        SDL_OutOfMemory();

        return -1;

    }

    texture->driverdata = data;

    renderdata->glGetError();

    renderdata->glGenTextures(1, &data->texture);

    if (renderdata->GL_ARB_texture_rectangle_supported) {

        data->type = GL_TEXTURE_RECTANGLE_ARB;

        texture_w = texture->w;

        texture_h = texture->h;

        data->texw = (GLfloat) texture->w;

        data->texh = (GLfloat) texture->h;

    } else {

        data->type = GL_TEXTURE_2D;

        texture_w = power_of_2(texture->w);

        texture_h = power_of_2(texture->h);

        data->texw = (GLfloat) texture->w / texture_w;

        data->texh = (GLfloat) texture->h / texture_h;

    }

    data->format = format;

    data->formattype = type;

    renderdata->glBindTexture(data->type, data->texture);

    renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,

                             texture_h, 0, format, type, NULL);

    result = renderdata->glGetError();

    if (result != GL_NO_ERROR) {

        GL_SetError("glTexImage2D()", result);

        return -1;

    }

    return 0;

}

static int

GL_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

                     const SDL_Color * colors, int firstcolor, int ncolors)

{

    GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

    GL_TextureData *data = (GL_TextureData *) texture->driverdata;

    return 0;

}

static int

GL_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

                     SDL_Color * colors, int firstcolor, int ncolors)

{

    GL_TextureData *data = (GL_TextureData *) texture->driverdata;

    return 0;

}

static void

SetupTextureUpdate(GL_RenderData * renderdata, SDL_Texture * texture,

                   int pitch)

{

    if (texture->format == SDL_PixelFormat_Index1LSB) {

        renderdata->glPixelStorei(GL_UNPACK_LSB_FIRST, 1);

    } else if (texture->format == SDL_PixelFormat_Index1MSB) {

        renderdata->glPixelStorei(GL_UNPACK_LSB_FIRST, 0);

    }

    renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH,

                              pitch / SDL_BYTESPERPIXEL(texture->format));

}

static int

GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

                 const SDL_Rect * rect, const void *pixels, int pitch)

{

    GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

    GL_TextureData *data = (GL_TextureData *) texture->driverdata;

    GLenum result;

    renderdata->glGetError();

    SetupTextureUpdate(renderdata, texture, pitch);

    renderdata->glBindTexture(data->type, data->texture);

    renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,

                                rect->h, data->format, data->formattype,

                                pixels);

    result = renderdata->glGetError();

    if (result != GL_NO_ERROR) {

        GL_SetError("glTexSubImage2D()", result);

        return -1;

    }

    return 0;

}

static int

GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

               const SDL_Rect * rect, int markDirty, void **pixels,

               int *pitch)

{