/*

     SDL - Simple DirectMedia Layer

     Copyright (C) 1997-2011 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

 */

 /**

  *  \file SDL_render.h

  *  

  *  Header file for SDL 2D rendering functions.

  *

  *  This API supports the following features:

  *      * single pixel points

  *      * single pixel lines

  *      * filled rectangles

  *      * texture images

  *

  *  The primitives may be drawn in opaque, blended, or additive modes.

  *

  *  The texture images may be drawn in opaque, blended, or additive modes.

  *  They can have an additional color tint or alpha modulation applied to

  *  them, and may also be stretched with linear interpolation.

  *

  *  This API is designed to accelerate simple 2D operations. You may

  *  want more functionality such as rotation and particle effects and

  *  in that case you should use SDL's OpenGL/Direct3D support or one

  *  of the many good 3D engines.

  */

 #ifndef _SDL_render_h

 #define _SDL_render_h

 #include "SDL_stdinc.h"

 #include "SDL_rect.h"

 #include "SDL_video.h"

 #include "begin_code.h"

 /* Set up for C function definitions, even when using C++ */

 #ifdef __cplusplus

 /* *INDENT-OFF* */

 extern "C" {

 /* *INDENT-ON* */

 #endif

 /**

  *  \brief Flags used when creating a rendering context

  */

 typedef enum

 {

     SDL_RENDERER_SOFTWARE = 0x00000001,         /**< The renderer is a software fallback */ 

     SDL_RENDERER_ACCELERATED = 0x00000002,      /**< The renderer uses hardware 

                                                      acceleration */

     SDL_RENDERER_PRESENTVSYNC = 0x00000004      /**< Present is synchronized 

                                                      with the refresh rate */

 } SDL_RendererFlags;

 /**

  *  \brief Information on the capabilities of a render driver or context.

  */

 typedef struct SDL_RendererInfo

 {

     const char *name;           /**< The name of the renderer */

     Uint32 flags;               /**< Supported ::SDL_RendererFlags */

     Uint32 num_texture_formats; /**< The number of available texture formats */

     Uint32 texture_formats[16]; /**< The available texture formats */

     int max_texture_width;      /**< The maximimum texture width */

     int max_texture_height;     /**< The maximimum texture height */

 } SDL_RendererInfo;

 /**

  *  \brief The access pattern allowed for a texture.

  */

 typedef enum

 {

     SDL_TEXTUREACCESS_STATIC,    /**< Changes rarely, not lockable */

     SDL_TEXTUREACCESS_STREAMING  /**< Changes frequently, lockable */

 } SDL_TextureAccess;

 /**

  *  \brief The texture channel modulation used in SDL_RenderCopy().

  */

 typedef enum

 {

     SDL_TEXTUREMODULATE_NONE = 0x00000000,     /**< No modulation */

     SDL_TEXTUREMODULATE_COLOR = 0x00000001,    /**< srcC = srcC * color */

     SDL_TEXTUREMODULATE_ALPHA = 0x00000002     /**< srcA = srcA * alpha */

 } SDL_TextureModulate;

 /**

  *  \brief A structure representing rendering state

  */

 struct SDL_Renderer;

 typedef struct SDL_Renderer SDL_Renderer;

 /**

  *  \brief An efficient driver-specific representation of pixel data

  */

 struct SDL_Texture;

 typedef struct SDL_Texture SDL_Texture;

 /* Function prototypes */

 /**

  *  \brief Get the number of 2D rendering drivers available for the current 

  *         display.

  *  

  *  A render driver is a set of code that handles rendering and texture

  *  management on a particular display.  Normally there is only one, but

  *  some drivers may have several available with different capabilities.

  *  

  *  \sa SDL_GetRenderDriverInfo()

  *  \sa SDL_CreateRenderer()

  */

 extern DECLSPEC int SDLCALL SDL_GetNumRenderDrivers(void);

 /**

  *  \brief Get information about a specific 2D rendering driver for the current 

  *         display.

  *  

  *  \param index The index of the driver to query information about.

  *  \param info  A pointer to an SDL_RendererInfo struct to be filled with 

  *               information on the rendering driver.

  *  

  *  \return 0 on success, -1 if the index was out of range.

  *  

  *  \sa SDL_CreateRenderer()

  */

 extern DECLSPEC int SDLCALL SDL_GetRenderDriverInfo(int index,

                                                     SDL_RendererInfo * info);

 /**

  *  \brief Create a 2D rendering context for a window.

  *  

  *  \param window The window where rendering is displayed.

  *  \param index    The index of the rendering driver to initialize, or -1 to 

  *                  initialize the first one supporting the requested flags.

  *  \param flags    ::SDL_RendererFlags.

  *  

  *  \return A valid rendering context or NULL if there was an error.

  *  

  *  \sa SDL_CreateSoftwareRenderer()

  *  \sa SDL_GetRendererInfo()

  *  \sa SDL_DestroyRenderer()

  */

 extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateRenderer(SDL_Window * window,

                                                int index, Uint32 flags);

 /**

  *  \brief Create a 2D software rendering context for a surface.

  *  

  *  \param surface The surface where rendering is done.

  *  

  *  \return A valid rendering context or NULL if there was an error.

  *  

  *  \sa SDL_CreateRenderer()

  *  \sa SDL_DestroyRenderer()

  */

 extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateSoftwareRenderer(SDL_Surface * surface);

 /**

  *  \brief Get information about a rendering context.

  */

 extern DECLSPEC int SDLCALL SDL_GetRendererInfo(SDL_Renderer * renderer,

                                                 SDL_RendererInfo * info);

 /**

  *  \brief Create a texture for a rendering context.

  *  

  *  \param format The format of the texture.

  *  \param access One of the enumerated values in ::SDL_TextureAccess.

  *  \param w      The width of the texture in pixels.

  *  \param h      The height of the texture in pixels.

  *  

  *  \return The created texture is returned, or 0 if no rendering context was 

  *          active,  the format was unsupported, or the width or height were out

  *          of range.

  *  

  *  \sa SDL_QueryTexture()

  *  \sa SDL_UpdateTexture()

  *  \sa SDL_DestroyTexture()

  */

 extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTexture(SDL_Renderer * renderer,

                                                         Uint32 format,

                                                         int access, int w,

                                                         int h);

 /**

  *  \brief Create a texture from an existing surface.

  *  

  *  \param surface The surface containing pixel data used to fill the texture.

  *  

  *  \return The created texture is returned, or 0 on error.

  *  

  *  \note The surface is not modified or freed by this function.

  *  

  *  \sa SDL_QueryTexture()

  *  \sa SDL_DestroyTexture()

  */

 extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTextureFromSurface(SDL_Renderer * renderer, SDL_Surface * surface);

 /**

  *  \brief Query the attributes of a texture

  *  

  *  \param texture A texture to be queried.

  *  \param format  A pointer filled in with the raw format of the texture.  The 

  *                 actual format may differ, but pixel transfers will use this 

  *                 format.

  *  \param access  A pointer filled in with the actual access to the texture.

  *  \param w       A pointer filled in with the width of the texture in pixels.

  *  \param h       A pointer filled in with the height of the texture in pixels.

  *  

  *  \return 0 on success, or -1 if the texture is not valid.

  */

 extern DECLSPEC int SDLCALL SDL_QueryTexture(SDL_Texture * texture,

                                              Uint32 * format, int *access,

                                              int *w, int *h);

 /**

  *  \brief Set an additional color value used in render copy operations.

  *  

  *  \param texture The texture to update.

  *  \param r       The red color value multiplied into copy operations.

  *  \param g       The green color value multiplied into copy operations.

  *  \param b       The blue color value multiplied into copy operations.

  *  

  *  \return 0 on success, or -1 if the texture is not valid or color modulation 

  *          is not supported.

  *  

  *  \sa SDL_GetTextureColorMod()

  */

 extern DECLSPEC int SDLCALL SDL_SetTextureColorMod(SDL_Texture * texture,

                                                    Uint8 r, Uint8 g, Uint8 b);

 /**

  *  \brief Get the additional color value used in render copy operations.

  *  

  *  \param texture The texture to query.

  *  \param r         A pointer filled in with the current red color value.

  *  \param g         A pointer filled in with the current green color value.

  *  \param b         A pointer filled in with the current blue color value.

  *  

  *  \return 0 on success, or -1 if the texture is not valid.

  *  

  *  \sa SDL_SetTextureColorMod()

  */

 extern DECLSPEC int SDLCALL SDL_GetTextureColorMod(SDL_Texture * texture,

                                                    Uint8 * r, Uint8 * g,

                                                    Uint8 * b);

 /**

  *  \brief Set an additional alpha value used in render copy operations.

  *  

  *  \param texture The texture to update.

  *  \param alpha     The alpha value multiplied into copy operations.

  *  

  *  \return 0 on success, or -1 if the texture is not valid or alpha modulation 

  *          is not supported.

  *  

  *  \sa SDL_GetTextureAlphaMod()

  */

 extern DECLSPEC int SDLCALL SDL_SetTextureAlphaMod(SDL_Texture * texture,

                                                    Uint8 alpha);

 /**

  *  \brief Get the additional alpha value used in render copy operations.

  *  

  *  \param texture The texture to query.

  *  \param alpha     A pointer filled in with the current alpha value.

  *  

  *  \return 0 on success, or -1 if the texture is not valid.

  *  

  *  \sa SDL_SetTextureAlphaMod()

  */

 extern DECLSPEC int SDLCALL SDL_GetTextureAlphaMod(SDL_Texture * texture,

                                                    Uint8 * alpha);

 /**

  *  \brief Set the blend mode used for texture copy operations.

  *  

  *  \param texture The texture to update.

  *  \param blendMode ::SDL_BlendMode to use for texture blending.

  *  

  *  \return 0 on success, or -1 if the texture is not valid or the blend mode is

  *          not supported.

  *  

  *  \note If the blend mode is not supported, the closest supported mode is

  *        chosen.

  *  

  *  \sa SDL_GetTextureBlendMode()

  */

 extern DECLSPEC int SDLCALL SDL_SetTextureBlendMode(SDL_Texture * texture,

                                                     SDL_BlendMode blendMode);

 /**

  *  \brief Get the blend mode used for texture copy operations.

  *  

  *  \param texture   The texture to query.

  *  \param blendMode A pointer filled in with the current blend mode.

  *  

  *  \return 0 on success, or -1 if the texture is not valid.

  *  

  *  \sa SDL_SetTextureBlendMode()

  */

 extern DECLSPEC int SDLCALL SDL_GetTextureBlendMode(SDL_Texture * texture,

                                                     SDL_BlendMode *blendMode);

 /**

  *  \brief Update the given texture rectangle with new pixel data.

  *  

  *  \param texture   The texture to update

  *  \param rect      A pointer to the rectangle of pixels to update, or NULL to 

  *                   update the entire texture.

  *  \param pixels    The raw pixel data.

  *  \param pitch     The number of bytes between rows of pixel data.

  *  

  *  \return 0 on success, or -1 if the texture is not valid.

  *  

  *  \note This is a fairly slow function.

  */

 extern DECLSPEC int SDLCALL SDL_UpdateTexture(SDL_Texture * texture,

                                               const SDL_Rect * rect,

                                               const void *pixels, int pitch);

 /**

  *  \brief Lock a portion of the texture for pixel access.

  *  

  *  \param texture   The texture to lock for access, which was created with 

  *                   ::SDL_TEXTUREACCESS_STREAMING.

  *  \param rect      A pointer to the rectangle to lock for access. If the rect 

  *                   is NULL, the entire texture will be locked.

  *  \param pixels    This is filled in with a pointer to the locked pixels, 

  *                   appropriately offset by the locked area.

  *  \param pitch     This is filled in with the pitch of the locked pixels.

  *  

  *  \return 0 on success, or -1 if the texture is not valid or was not created with ::SDL_TEXTUREACCESS_STREAMING.

  *  

  *  \sa SDL_UnlockTexture()

  */

 extern DECLSPEC int SDLCALL SDL_LockTexture(SDL_Texture * texture,

                                             const SDL_Rect * rect,

                                             void **pixels, int *pitch);

 /**

  *  \brief Unlock a texture, uploading the changes to video memory, if needed.

  *  

  *  \sa SDL_LockTexture()

  */

 extern DECLSPEC void SDLCALL SDL_UnlockTexture(SDL_Texture * texture);

 /**

  *  \brief Set the drawing area for rendering on the current target.

  *

  *  \param rect The rectangle representing the drawing area, or NULL to set the viewport to the entire target.

  *

  *  The x,y of the viewport rect represents the origin for rendering.

  *

  *  \note When the window is resized, the current viewport is automatically

  *        centered within the new window size.

  */

 extern DECLSPEC int SDLCALL SDL_RenderSetViewport(SDL_Renderer * renderer,

                                                   const SDL_Rect * rect);

 /**

  *  \brief Get the drawing area for the current target.

  */

 extern DECLSPEC void SDLCALL SDL_RenderGetViewport(SDL_Renderer * renderer,

                                                    SDL_Rect * rect);

 /**

  *  \brief Set the color used for drawing operations (Fill and Line).

  *  

  *  \param r The red value used to draw on the rendering target.

  *  \param g The green value used to draw on the rendering target.

  *  \param b The blue value used to draw on the rendering target.

  *  \param a The alpha value used to draw on the rendering target, usually 

  *           ::SDL_ALPHA_OPAQUE (255).

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDL_SetRenderDrawColor(SDL_Renderer * renderer,

                                            Uint8 r, Uint8 g, Uint8 b,

                                            Uint8 a);

 /**

  *  \brief Get the color used for drawing operations (Fill and Line).

  *  

  *  \param r A pointer to the red value used to draw on the rendering target.

  *  \param g A pointer to the green value used to draw on the rendering target.

  *  \param b A pointer to the blue value used to draw on the rendering target.

  *  \param a A pointer to the alpha value used to draw on the rendering target, 

  *           usually ::SDL_ALPHA_OPAQUE (255).

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDL_GetRenderDrawColor(SDL_Renderer * renderer,

                                            Uint8 * r, Uint8 * g, Uint8 * b,

                                            Uint8 * a);

 /**

  *  \brief Set the blend mode used for drawing operations (Fill and Line).

  *  

  *  \param blendMode ::SDL_BlendMode to use for blending.

  *  

  *  \return 0 on success, or -1 on error

  *  

  *  \note If the blend mode is not supported, the closest supported mode is 

  *        chosen.

  *  

  *  \sa SDL_GetRenderDrawBlendMode()

  */

 extern DECLSPEC int SDLCALL SDL_SetRenderDrawBlendMode(SDL_Renderer * renderer,

                                                        SDL_BlendMode blendMode);

 /**

  *  \brief Get the blend mode used for drawing operations.

  *  

  *  \param blendMode A pointer filled in with the current blend mode.

  *  

  *  \return 0 on success, or -1 on error

  *  

  *  \sa SDL_SetRenderDrawBlendMode()

  */

 extern DECLSPEC int SDLCALL SDL_GetRenderDrawBlendMode(SDL_Renderer * renderer,

                                                        SDL_BlendMode *blendMode);

 /**

  *  \brief Clear the current rendering target with the drawing color

  *

  *  This function clears the entire rendering target, ignoring the viewport.

  */

 extern DECLSPEC int SDLCALL SDL_RenderClear(SDL_Renderer * renderer);

 /**

  *  \brief Draw a point on the current rendering target.

  *  

  *  \param x The x coordinate of the point.

  *  \param y The y coordinate of the point.

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderDrawPoint(SDL_Renderer * renderer,

                                                 int x, int y);

 /**

  *  \brief Draw multiple points on the current rendering target.

  *  

  *  \param points The points to draw

  *  \param count The number of points to draw

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderDrawPoints(SDL_Renderer * renderer,

                                                  const SDL_Point * points,

                                                  int count);

 /**

  *  \brief Draw a line on the current rendering target.

  *  

  *  \param x1 The x coordinate of the start point.

  *  \param y1 The y coordinate of the start point.

  *  \param x2 The x coordinate of the end point.

  *  \param y2 The y coordinate of the end point.

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderDrawLine(SDL_Renderer * renderer,

                                                int x1, int y1, int x2, int y2);

 /**

  *  \brief Draw a series of connected lines on the current rendering target.

  *  

  *  \param points The points along the lines

  *  \param count The number of points, drawing count-1 lines

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderDrawLines(SDL_Renderer * renderer,

                                                 const SDL_Point * points,

                                                 int count);

 /**

  *  \brief Draw a rectangle on the current rendering target.

  *  

  *  \param rect A pointer to the destination rectangle, or NULL to outline the entire rendering target.

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderDrawRect(SDL_Renderer * renderer,

                                                const SDL_Rect * rect);

 /**

  *  \brief Draw some number of rectangles on the current rendering target.

  *  

  *  \param rects A pointer to an array of destination rectangles.

  *  \param count The number of rectangles.

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderDrawRects(SDL_Renderer * renderer,

                                                 const SDL_Rect * rects,

                                                 int count);

 /**

  *  \brief Fill a rectangle on the current rendering target with the drawing color.

  *  

  *  \param rect A pointer to the destination rectangle, or NULL for the entire 

  *              rendering target.

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderFillRect(SDL_Renderer * renderer,

                                                const SDL_Rect * rect);

 /**

  *  \brief Fill some number of rectangles on the current rendering target with the drawing color.

  *  

  *  \param rects A pointer to an array of destination rectangles.

  *  \param count The number of rectangles.

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderFillRects(SDL_Renderer * renderer,

                                                 const SDL_Rect * rects,

                                                 int count);

 /**

  *  \brief Copy a portion of the texture to the current rendering target.

  *  

  *  \param texture The source texture.

  *  \param srcrect   A pointer to the source rectangle, or NULL for the entire 

  *                   texture.

  *  \param dstrect   A pointer to the destination rectangle, or NULL for the 

  *                   entire rendering target.

  *  

  *  \return 0 on success, or -1 on error

  */

 extern DECLSPEC int SDLCALL SDL_RenderCopy(SDL_Renderer * renderer,

                                            SDL_Texture * texture,

                                            const SDL_Rect * srcrect,

                                            const SDL_Rect * dstrect);

 /**

  *  \brief Read pixels from the current rendering target.

  *  

  *  \param rect   A pointer to the rectangle to read, or NULL for the entire 

  *                render target.

  *  \param format The desired format of the pixel data, or 0 to use the format

  *                of the rendering target

  *  \param pixels A pointer to be filled in with the pixel data

  *  \param pitch  The pitch of the pixels parameter.

  *  

  *  \return 0 on success, or -1 if pixel reading is not supported.

  *  

  *  \warning This is a very slow operation, and should not be used frequently.

  */

 extern DECLSPEC int SDLCALL SDL_RenderReadPixels(SDL_Renderer * renderer,

                                                  const SDL_Rect * rect,

                                                  Uint32 format,

                                                  void *pixels, int pitch);

 /**

  *  \brief Update the screen with rendering performed.

  */

 extern DECLSPEC void SDLCALL SDL_RenderPresent(SDL_Renderer * renderer);

 /**

  *  \brief Destroy the specified texture.

  *  

  *  \sa SDL_CreateTexture()

  *  \sa SDL_CreateTextureFromSurface()

  */

 extern DECLSPEC void SDLCALL SDL_DestroyTexture(SDL_Texture * texture);

 /**

  *  \brief Destroy the rendering context for a window and free associated

  *         textures.

  *  

  *  \sa SDL_CreateRenderer()

  */

 extern DECLSPEC void SDLCALL SDL_DestroyRenderer(SDL_Renderer * renderer);

 /* Ends C function definitions when using C++ */

 #ifdef __cplusplus

 /* *INDENT-OFF* */

 }

 /* *INDENT-ON* */

 #endif

 #include "close_code.h"

 #endif /* _SDL_render_h */

 /* vi: set ts=4 sw=4 expandtab: */