Home | History | Annotate | Download | only in SDL2
      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2014 Sam Lantinga <slouken (at) libsdl.org>
      4 
      5   This software is provided 'as-is', without any express or implied
      6   warranty.  In no event will the authors be held liable for any damages
      7   arising from the use of this software.
      8 
      9   Permission is granted to anyone to use this software for any purpose,
     10   including commercial applications, and to alter it and redistribute it
     11   freely, subject to the following restrictions:
     12 
     13   1. The origin of this software must not be misrepresented; you must not
     14      claim that you wrote the original software. If you use this software
     15      in a product, an acknowledgment in the product documentation would be
     16      appreciated but is not required.
     17   2. Altered source versions must be plainly marked as such, and must not be
     18      misrepresented as being the original software.
     19   3. This notice may not be removed or altered from any source distribution.
     20 */
     21 
     22 /**
     23  *  \file SDL_render.h
     24  *
     25  *  Header file for SDL 2D rendering functions.
     26  *
     27  *  This API supports the following features:
     28  *      * single pixel points
     29  *      * single pixel lines
     30  *      * filled rectangles
     31  *      * texture images
     32  *
     33  *  The primitives may be drawn in opaque, blended, or additive modes.
     34  *
     35  *  The texture images may be drawn in opaque, blended, or additive modes.
     36  *  They can have an additional color tint or alpha modulation applied to
     37  *  them, and may also be stretched with linear interpolation.
     38  *
     39  *  This API is designed to accelerate simple 2D operations. You may
     40  *  want more functionality such as polygons and particle effects and
     41  *  in that case you should use SDL's OpenGL/Direct3D support or one
     42  *  of the many good 3D engines.
     43  *
     44  *  These functions must be called from the main thread.
     45  *  See this bug for details: http://bugzilla.libsdl.org/show_bug.cgi?id=1995
     46  */
     47 
     48 #ifndef _SDL_render_h
     49 #define _SDL_render_h
     50 
     51 #include "SDL_stdinc.h"
     52 #include "SDL_rect.h"
     53 #include "SDL_video.h"
     54 
     55 #include "begin_code.h"
     56 /* Set up for C function definitions, even when using C++ */
     57 #ifdef __cplusplus
     58 extern "C" {
     59 #endif
     60 
     61 /**
     62  *  \brief Flags used when creating a rendering context
     63  */
     64 typedef enum
     65 {
     66     SDL_RENDERER_SOFTWARE = 0x00000001,         /**< The renderer is a software fallback */
     67     SDL_RENDERER_ACCELERATED = 0x00000002,      /**< The renderer uses hardware
     68                                                      acceleration */
     69     SDL_RENDERER_PRESENTVSYNC = 0x00000004,     /**< Present is synchronized
     70                                                      with the refresh rate */
     71     SDL_RENDERER_TARGETTEXTURE = 0x00000008     /**< The renderer supports
     72                                                      rendering to texture */
     73 } SDL_RendererFlags;
     74 
     75 /**
     76  *  \brief Information on the capabilities of a render driver or context.
     77  */
     78 typedef struct SDL_RendererInfo
     79 {
     80     const char *name;           /**< The name of the renderer */
     81     Uint32 flags;               /**< Supported ::SDL_RendererFlags */
     82     Uint32 num_texture_formats; /**< The number of available texture formats */
     83     Uint32 texture_formats[16]; /**< The available texture formats */
     84     int max_texture_width;      /**< The maximimum texture width */
     85     int max_texture_height;     /**< The maximimum texture height */
     86 } SDL_RendererInfo;
     87 
     88 /**
     89  *  \brief The access pattern allowed for a texture.
     90  */
     91 typedef enum
     92 {
     93     SDL_TEXTUREACCESS_STATIC,    /**< Changes rarely, not lockable */
     94     SDL_TEXTUREACCESS_STREAMING, /**< Changes frequently, lockable */
     95     SDL_TEXTUREACCESS_TARGET     /**< Texture can be used as a render target */
     96 } SDL_TextureAccess;
     97 
     98 /**
     99  *  \brief The texture channel modulation used in SDL_RenderCopy().
    100  */
    101 typedef enum
    102 {
    103     SDL_TEXTUREMODULATE_NONE = 0x00000000,     /**< No modulation */
    104     SDL_TEXTUREMODULATE_COLOR = 0x00000001,    /**< srcC = srcC * color */
    105     SDL_TEXTUREMODULATE_ALPHA = 0x00000002     /**< srcA = srcA * alpha */
    106 } SDL_TextureModulate;
    107 
    108 /**
    109  *  \brief Flip constants for SDL_RenderCopyEx
    110  */
    111 typedef enum
    112 {
    113     SDL_FLIP_NONE = 0x00000000,     /**< Do not flip */
    114     SDL_FLIP_HORIZONTAL = 0x00000001,    /**< flip horizontally */
    115     SDL_FLIP_VERTICAL = 0x00000002     /**< flip vertically */
    116 } SDL_RendererFlip;
    117 
    118 /**
    119  *  \brief A structure representing rendering state
    120  */
    121 struct SDL_Renderer;
    122 typedef struct SDL_Renderer SDL_Renderer;
    123 
    124 /**
    125  *  \brief An efficient driver-specific representation of pixel data
    126  */
    127 struct SDL_Texture;
    128 typedef struct SDL_Texture SDL_Texture;
    129 
    130 
    131 /* Function prototypes */
    132 
    133 /**
    134  *  \brief Get the number of 2D rendering drivers available for the current
    135  *         display.
    136  *
    137  *  A render driver is a set of code that handles rendering and texture
    138  *  management on a particular display.  Normally there is only one, but
    139  *  some drivers may have several available with different capabilities.
    140  *
    141  *  \sa SDL_GetRenderDriverInfo()
    142  *  \sa SDL_CreateRenderer()
    143  */
    144 extern DECLSPEC int SDLCALL SDL_GetNumRenderDrivers(void);
    145 
    146 /**
    147  *  \brief Get information about a specific 2D rendering driver for the current
    148  *         display.
    149  *
    150  *  \param index The index of the driver to query information about.
    151  *  \param info  A pointer to an SDL_RendererInfo struct to be filled with
    152  *               information on the rendering driver.
    153  *
    154  *  \return 0 on success, -1 if the index was out of range.
    155  *
    156  *  \sa SDL_CreateRenderer()
    157  */
    158 extern DECLSPEC int SDLCALL SDL_GetRenderDriverInfo(int index,
    159                                                     SDL_RendererInfo * info);
    160 
    161 /**
    162  *  \brief Create a window and default renderer
    163  *
    164  *  \param width    The width of the window
    165  *  \param height   The height of the window
    166  *  \param window_flags The flags used to create the window
    167  *  \param window   A pointer filled with the window, or NULL on error
    168  *  \param renderer A pointer filled with the renderer, or NULL on error
    169  *
    170  *  \return 0 on success, or -1 on error
    171  */
    172 extern DECLSPEC int SDLCALL SDL_CreateWindowAndRenderer(
    173                                 int width, int height, Uint32 window_flags,
    174                                 SDL_Window **window, SDL_Renderer **renderer);
    175 
    176 
    177 /**
    178  *  \brief Create a 2D rendering context for a window.
    179  *
    180  *  \param window The window where rendering is displayed.
    181  *  \param index    The index of the rendering driver to initialize, or -1 to
    182  *                  initialize the first one supporting the requested flags.
    183  *  \param flags    ::SDL_RendererFlags.
    184  *
    185  *  \return A valid rendering context or NULL if there was an error.
    186  *
    187  *  \sa SDL_CreateSoftwareRenderer()
    188  *  \sa SDL_GetRendererInfo()
    189  *  \sa SDL_DestroyRenderer()
    190  */
    191 extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateRenderer(SDL_Window * window,
    192                                                int index, Uint32 flags);
    193 
    194 /**
    195  *  \brief Create a 2D software rendering context for a surface.
    196  *
    197  *  \param surface The surface where rendering is done.
    198  *
    199  *  \return A valid rendering context or NULL if there was an error.
    200  *
    201  *  \sa SDL_CreateRenderer()
    202  *  \sa SDL_DestroyRenderer()
    203  */
    204 extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateSoftwareRenderer(SDL_Surface * surface);
    205 
    206 /**
    207  *  \brief Get the renderer associated with a window.
    208  */
    209 extern DECLSPEC SDL_Renderer * SDLCALL SDL_GetRenderer(SDL_Window * window);
    210 
    211 /**
    212  *  \brief Get information about a rendering context.
    213  */
    214 extern DECLSPEC int SDLCALL SDL_GetRendererInfo(SDL_Renderer * renderer,
    215                                                 SDL_RendererInfo * info);
    216 
    217 /**
    218  *  \brief Get the output size of a rendering context.
    219  */
    220 extern DECLSPEC int SDLCALL SDL_GetRendererOutputSize(SDL_Renderer * renderer,
    221                                                       int *w, int *h);
    222 
    223 /**
    224  *  \brief Create a texture for a rendering context.
    225  *
    226  *  \param renderer The renderer.
    227  *  \param format The format of the texture.
    228  *  \param access One of the enumerated values in ::SDL_TextureAccess.
    229  *  \param w      The width of the texture in pixels.
    230  *  \param h      The height of the texture in pixels.
    231  *
    232  *  \return The created texture is returned, or 0 if no rendering context was
    233  *          active,  the format was unsupported, or the width or height were out
    234  *          of range.
    235  *
    236  *  \sa SDL_QueryTexture()
    237  *  \sa SDL_UpdateTexture()
    238  *  \sa SDL_DestroyTexture()
    239  */
    240 extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTexture(SDL_Renderer * renderer,
    241                                                         Uint32 format,
    242                                                         int access, int w,
    243                                                         int h);
    244 
    245 /**
    246  *  \brief Create a texture from an existing surface.
    247  *
    248  *  \param renderer The renderer.
    249  *  \param surface The surface containing pixel data used to fill the texture.
    250  *
    251  *  \return The created texture is returned, or 0 on error.
    252  *
    253  *  \note The surface is not modified or freed by this function.
    254  *
    255  *  \sa SDL_QueryTexture()
    256  *  \sa SDL_DestroyTexture()
    257  */
    258 extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTextureFromSurface(SDL_Renderer * renderer, SDL_Surface * surface);
    259 
    260 /**
    261  *  \brief Query the attributes of a texture
    262  *
    263  *  \param texture A texture to be queried.
    264  *  \param format  A pointer filled in with the raw format of the texture.  The
    265  *                 actual format may differ, but pixel transfers will use this
    266  *                 format.
    267  *  \param access  A pointer filled in with the actual access to the texture.
    268  *  \param w       A pointer filled in with the width of the texture in pixels.
    269  *  \param h       A pointer filled in with the height of the texture in pixels.
    270  *
    271  *  \return 0 on success, or -1 if the texture is not valid.
    272  */
    273 extern DECLSPEC int SDLCALL SDL_QueryTexture(SDL_Texture * texture,
    274                                              Uint32 * format, int *access,
    275                                              int *w, int *h);
    276 
    277 /**
    278  *  \brief Set an additional color value used in render copy operations.
    279  *
    280  *  \param texture The texture to update.
    281  *  \param r       The red color value multiplied into copy operations.
    282  *  \param g       The green color value multiplied into copy operations.
    283  *  \param b       The blue color value multiplied into copy operations.
    284  *
    285  *  \return 0 on success, or -1 if the texture is not valid or color modulation
    286  *          is not supported.
    287  *
    288  *  \sa SDL_GetTextureColorMod()
    289  */
    290 extern DECLSPEC int SDLCALL SDL_SetTextureColorMod(SDL_Texture * texture,
    291                                                    Uint8 r, Uint8 g, Uint8 b);
    292 
    293 
    294 /**
    295  *  \brief Get the additional color value used in render copy operations.
    296  *
    297  *  \param texture The texture to query.
    298  *  \param r         A pointer filled in with the current red color value.
    299  *  \param g         A pointer filled in with the current green color value.
    300  *  \param b         A pointer filled in with the current blue color value.
    301  *
    302  *  \return 0 on success, or -1 if the texture is not valid.
    303  *
    304  *  \sa SDL_SetTextureColorMod()
    305  */
    306 extern DECLSPEC int SDLCALL SDL_GetTextureColorMod(SDL_Texture * texture,
    307                                                    Uint8 * r, Uint8 * g,
    308                                                    Uint8 * b);
    309 
    310 /**
    311  *  \brief Set an additional alpha value used in render copy operations.
    312  *
    313  *  \param texture The texture to update.
    314  *  \param alpha     The alpha value multiplied into copy operations.
    315  *
    316  *  \return 0 on success, or -1 if the texture is not valid or alpha modulation
    317  *          is not supported.
    318  *
    319  *  \sa SDL_GetTextureAlphaMod()
    320  */
    321 extern DECLSPEC int SDLCALL SDL_SetTextureAlphaMod(SDL_Texture * texture,
    322                                                    Uint8 alpha);
    323 
    324 /**
    325  *  \brief Get the additional alpha value used in render copy operations.
    326  *
    327  *  \param texture The texture to query.
    328  *  \param alpha     A pointer filled in with the current alpha value.
    329  *
    330  *  \return 0 on success, or -1 if the texture is not valid.
    331  *
    332  *  \sa SDL_SetTextureAlphaMod()
    333  */
    334 extern DECLSPEC int SDLCALL SDL_GetTextureAlphaMod(SDL_Texture * texture,
    335                                                    Uint8 * alpha);
    336 
    337 /**
    338  *  \brief Set the blend mode used for texture copy operations.
    339  *
    340  *  \param texture The texture to update.
    341  *  \param blendMode ::SDL_BlendMode to use for texture blending.
    342  *
    343  *  \return 0 on success, or -1 if the texture is not valid or the blend mode is
    344  *          not supported.
    345  *
    346  *  \note If the blend mode is not supported, the closest supported mode is
    347  *        chosen.
    348  *
    349  *  \sa SDL_GetTextureBlendMode()
    350  */
    351 extern DECLSPEC int SDLCALL SDL_SetTextureBlendMode(SDL_Texture * texture,
    352                                                     SDL_BlendMode blendMode);
    353 
    354 /**
    355  *  \brief Get the blend mode used for texture copy operations.
    356  *
    357  *  \param texture   The texture to query.
    358  *  \param blendMode A pointer filled in with the current blend mode.
    359  *
    360  *  \return 0 on success, or -1 if the texture is not valid.
    361  *
    362  *  \sa SDL_SetTextureBlendMode()
    363  */
    364 extern DECLSPEC int SDLCALL SDL_GetTextureBlendMode(SDL_Texture * texture,
    365                                                     SDL_BlendMode *blendMode);
    366 
    367 /**
    368  *  \brief Update the given texture rectangle with new pixel data.
    369  *
    370  *  \param texture   The texture to update
    371  *  \param rect      A pointer to the rectangle of pixels to update, or NULL to
    372  *                   update the entire texture.
    373  *  \param pixels    The raw pixel data.
    374  *  \param pitch     The number of bytes between rows of pixel data.
    375  *
    376  *  \return 0 on success, or -1 if the texture is not valid.
    377  *
    378  *  \note This is a fairly slow function.
    379  */
    380 extern DECLSPEC int SDLCALL SDL_UpdateTexture(SDL_Texture * texture,
    381                                               const SDL_Rect * rect,
    382                                               const void *pixels, int pitch);
    383 
    384 /**
    385  *  \brief Update a rectangle within a planar YV12 or IYUV texture with new pixel data.
    386  *
    387  *  \param texture   The texture to update
    388  *  \param rect      A pointer to the rectangle of pixels to update, or NULL to
    389  *                   update the entire texture.
    390  *  \param Yplane    The raw pixel data for the Y plane.
    391  *  \param Ypitch    The number of bytes between rows of pixel data for the Y plane.
    392  *  \param Uplane    The raw pixel data for the U plane.
    393  *  \param Upitch    The number of bytes between rows of pixel data for the U plane.
    394  *  \param Vplane    The raw pixel data for the V plane.
    395  *  \param Vpitch    The number of bytes between rows of pixel data for the V plane.
    396  *
    397  *  \return 0 on success, or -1 if the texture is not valid.
    398  *
    399  *  \note You can use SDL_UpdateTexture() as long as your pixel data is
    400  *        a contiguous block of Y and U/V planes in the proper order, but
    401  *        this function is available if your pixel data is not contiguous.
    402  */
    403 extern DECLSPEC int SDLCALL SDL_UpdateYUVTexture(SDL_Texture * texture,
    404                                                  const SDL_Rect * rect,
    405                                                  const Uint8 *Yplane, int Ypitch,
    406                                                  const Uint8 *Uplane, int Upitch,
    407                                                  const Uint8 *Vplane, int Vpitch);
    408 
    409 /**
    410  *  \brief Lock a portion of the texture for write-only pixel access.
    411  *
    412  *  \param texture   The texture to lock for access, which was created with
    413  *                   ::SDL_TEXTUREACCESS_STREAMING.
    414  *  \param rect      A pointer to the rectangle to lock for access. If the rect
    415  *                   is NULL, the entire texture will be locked.
    416  *  \param pixels    This is filled in with a pointer to the locked pixels,
    417  *                   appropriately offset by the locked area.
    418  *  \param pitch     This is filled in with the pitch of the locked pixels.
    419  *
    420  *  \return 0 on success, or -1 if the texture is not valid or was not created with ::SDL_TEXTUREACCESS_STREAMING.
    421  *
    422  *  \sa SDL_UnlockTexture()
    423  */
    424 extern DECLSPEC int SDLCALL SDL_LockTexture(SDL_Texture * texture,
    425                                             const SDL_Rect * rect,
    426                                             void **pixels, int *pitch);
    427 
    428 /**
    429  *  \brief Unlock a texture, uploading the changes to video memory, if needed.
    430  *
    431  *  \sa SDL_LockTexture()
    432  */
    433 extern DECLSPEC void SDLCALL SDL_UnlockTexture(SDL_Texture * texture);
    434 
    435 /**
    436  * \brief Determines whether a window supports the use of render targets
    437  *
    438  * \param renderer The renderer that will be checked
    439  *
    440  * \return SDL_TRUE if supported, SDL_FALSE if not.
    441  */
    442 extern DECLSPEC SDL_bool SDLCALL SDL_RenderTargetSupported(SDL_Renderer *renderer);
    443 
    444 /**
    445  * \brief Set a texture as the current rendering target.
    446  *
    447  * \param renderer The renderer.
    448  * \param texture The targeted texture, which must be created with the SDL_TEXTUREACCESS_TARGET flag, or NULL for the default render target
    449  *
    450  * \return 0 on success, or -1 on error
    451  *
    452  *  \sa SDL_GetRenderTarget()
    453  */
    454 extern DECLSPEC int SDLCALL SDL_SetRenderTarget(SDL_Renderer *renderer,
    455                                                 SDL_Texture *texture);
    456 
    457 /**
    458  * \brief Get the current render target or NULL for the default render target.
    459  *
    460  * \return The current render target
    461  *
    462  *  \sa SDL_SetRenderTarget()
    463  */
    464 extern DECLSPEC SDL_Texture * SDLCALL SDL_GetRenderTarget(SDL_Renderer *renderer);
    465 
    466 /**
    467  *  \brief Set device independent resolution for rendering
    468  *
    469  *  \param renderer The renderer for which resolution should be set.
    470  *  \param w      The width of the logical resolution
    471  *  \param h      The height of the logical resolution
    472  *
    473  *  This function uses the viewport and scaling functionality to allow a fixed logical
    474  *  resolution for rendering, regardless of the actual output resolution.  If the actual
    475  *  output resolution doesn't have the same aspect ratio the output rendering will be
    476  *  centered within the output display.
    477  *
    478  *  If the output display is a window, mouse events in the window will be filtered
    479  *  and scaled so they seem to arrive within the logical resolution.
    480  *
    481  *  \note If this function results in scaling or subpixel drawing by the
    482  *        rendering backend, it will be handled using the appropriate
    483  *        quality hints.
    484  *
    485  *  \sa SDL_RenderGetLogicalSize()
    486  *  \sa SDL_RenderSetScale()
    487  *  \sa SDL_RenderSetViewport()
    488  */
    489 extern DECLSPEC int SDLCALL SDL_RenderSetLogicalSize(SDL_Renderer * renderer, int w, int h);
    490 
    491 /**
    492  *  \brief Get device independent resolution for rendering
    493  *
    494  *  \param renderer The renderer from which resolution should be queried.
    495  *  \param w      A pointer filled with the width of the logical resolution
    496  *  \param h      A pointer filled with the height of the logical resolution
    497  *
    498  *  \sa SDL_RenderSetLogicalSize()
    499  */
    500 extern DECLSPEC void SDLCALL SDL_RenderGetLogicalSize(SDL_Renderer * renderer, int *w, int *h);
    501 
    502 /**
    503  *  \brief Set the drawing area for rendering on the current target.
    504  *
    505  *  \param renderer The renderer for which the drawing area should be set.
    506  *  \param rect The rectangle representing the drawing area, or NULL to set the viewport to the entire target.
    507  *
    508  *  The x,y of the viewport rect represents the origin for rendering.
    509  *
    510  *  \return 0 on success, or -1 on error
    511  *
    512  *  \note If the window associated with the renderer is resized, the viewport is automatically reset.
    513  *
    514  *  \sa SDL_RenderGetViewport()
    515  *  \sa SDL_RenderSetLogicalSize()
    516  */
    517 extern DECLSPEC int SDLCALL SDL_RenderSetViewport(SDL_Renderer * renderer,
    518                                                   const SDL_Rect * rect);
    519 
    520 /**
    521  *  \brief Get the drawing area for the current target.
    522  *
    523  *  \sa SDL_RenderSetViewport()
    524  */
    525 extern DECLSPEC void SDLCALL SDL_RenderGetViewport(SDL_Renderer * renderer,
    526                                                    SDL_Rect * rect);
    527 
    528 /**
    529  *  \brief Set the clip rectangle for the current target.
    530  *
    531  *  \param renderer The renderer for which clip rectangle should be set.
    532  *  \param rect   A pointer to the rectangle to set as the clip rectangle, or
    533  *                NULL to disable clipping.
    534  *
    535  *  \return 0 on success, or -1 on error
    536  *
    537  *  \sa SDL_RenderGetClipRect()
    538  */
    539 extern DECLSPEC int SDLCALL SDL_RenderSetClipRect(SDL_Renderer * renderer,
    540                                                   const SDL_Rect * rect);
    541 
    542 /**
    543  *  \brief Get the clip rectangle for the current target.
    544  *
    545  *  \param renderer The renderer from which clip rectangle should be queried.
    546  *  \param rect   A pointer filled in with the current clip rectangle, or
    547  *                an empty rectangle if clipping is disabled.
    548  *
    549  *  \sa SDL_RenderSetClipRect()
    550  */
    551 extern DECLSPEC void SDLCALL SDL_RenderGetClipRect(SDL_Renderer * renderer,
    552                                                    SDL_Rect * rect);
    553 
    554 /**
    555  *  \brief Set the drawing scale for rendering on the current target.
    556  *
    557  *  \param renderer The renderer for which the drawing scale should be set.
    558  *  \param scaleX The horizontal scaling factor
    559  *  \param scaleY The vertical scaling factor
    560  *
    561  *  The drawing coordinates are scaled by the x/y scaling factors
    562  *  before they are used by the renderer.  This allows resolution
    563  *  independent drawing with a single coordinate system.
    564  *
    565  *  \note If this results in scaling or subpixel drawing by the
    566  *        rendering backend, it will be handled using the appropriate
    567  *        quality hints.  For best results use integer scaling factors.
    568  *
    569  *  \sa SDL_RenderGetScale()
    570  *  \sa SDL_RenderSetLogicalSize()
    571  */
    572 extern DECLSPEC int SDLCALL SDL_RenderSetScale(SDL_Renderer * renderer,
    573                                                float scaleX, float scaleY);
    574 
    575 /**
    576  *  \brief Get the drawing scale for the current target.
    577  *
    578  *  \param renderer The renderer from which drawing scale should be queried.
    579  *  \param scaleX A pointer filled in with the horizontal scaling factor
    580  *  \param scaleY A pointer filled in with the vertical scaling factor
    581  *
    582  *  \sa SDL_RenderSetScale()
    583  */
    584 extern DECLSPEC void SDLCALL SDL_RenderGetScale(SDL_Renderer * renderer,
    585                                                float *scaleX, float *scaleY);
    586 
    587 /**
    588  *  \brief Set the color used for drawing operations (Rect, Line and Clear).
    589  *
    590  *  \param renderer The renderer for which drawing color should be set.
    591  *  \param r The red value used to draw on the rendering target.
    592  *  \param g The green value used to draw on the rendering target.
    593  *  \param b The blue value used to draw on the rendering target.
    594  *  \param a The alpha value used to draw on the rendering target, usually
    595  *           ::SDL_ALPHA_OPAQUE (255).
    596  *
    597  *  \return 0 on success, or -1 on error
    598  */
    599 extern DECLSPEC int SDLCALL SDL_SetRenderDrawColor(SDL_Renderer * renderer,
    600                                            Uint8 r, Uint8 g, Uint8 b,
    601                                            Uint8 a);
    602 
    603 /**
    604  *  \brief Get the color used for drawing operations (Rect, Line and Clear).
    605  *
    606  *  \param renderer The renderer from which drawing color should be queried.
    607  *  \param r A pointer to the red value used to draw on the rendering target.
    608  *  \param g A pointer to the green value used to draw on the rendering target.
    609  *  \param b A pointer to the blue value used to draw on the rendering target.
    610  *  \param a A pointer to the alpha value used to draw on the rendering target,
    611  *           usually ::SDL_ALPHA_OPAQUE (255).
    612  *
    613  *  \return 0 on success, or -1 on error
    614  */
    615 extern DECLSPEC int SDLCALL SDL_GetRenderDrawColor(SDL_Renderer * renderer,
    616                                            Uint8 * r, Uint8 * g, Uint8 * b,
    617                                            Uint8 * a);
    618 
    619 /**
    620  *  \brief Set the blend mode used for drawing operations (Fill and Line).
    621  *
    622  *  \param renderer The renderer for which blend mode should be set.
    623  *  \param blendMode ::SDL_BlendMode to use for blending.
    624  *
    625  *  \return 0 on success, or -1 on error
    626  *
    627  *  \note If the blend mode is not supported, the closest supported mode is
    628  *        chosen.
    629  *
    630  *  \sa SDL_GetRenderDrawBlendMode()
    631  */
    632 extern DECLSPEC int SDLCALL SDL_SetRenderDrawBlendMode(SDL_Renderer * renderer,
    633                                                        SDL_BlendMode blendMode);
    634 
    635 /**
    636  *  \brief Get the blend mode used for drawing operations.
    637  *
    638  *  \param renderer The renderer from which blend mode should be queried.
    639  *  \param blendMode A pointer filled in with the current blend mode.
    640  *
    641  *  \return 0 on success, or -1 on error
    642  *
    643  *  \sa SDL_SetRenderDrawBlendMode()
    644  */
    645 extern DECLSPEC int SDLCALL SDL_GetRenderDrawBlendMode(SDL_Renderer * renderer,
    646                                                        SDL_BlendMode *blendMode);
    647 
    648 /**
    649  *  \brief Clear the current rendering target with the drawing color
    650  *
    651  *  This function clears the entire rendering target, ignoring the viewport.
    652  *
    653  *  \return 0 on success, or -1 on error
    654  */
    655 extern DECLSPEC int SDLCALL SDL_RenderClear(SDL_Renderer * renderer);
    656 
    657 /**
    658  *  \brief Draw a point on the current rendering target.
    659  *
    660  *  \param renderer The renderer which should draw a point.
    661  *  \param x The x coordinate of the point.
    662  *  \param y The y coordinate of the point.
    663  *
    664  *  \return 0 on success, or -1 on error
    665  */
    666 extern DECLSPEC int SDLCALL SDL_RenderDrawPoint(SDL_Renderer * renderer,
    667                                                 int x, int y);
    668 
    669 /**
    670  *  \brief Draw multiple points on the current rendering target.
    671  *
    672  *  \param renderer The renderer which should draw multiple points.
    673  *  \param points The points to draw
    674  *  \param count The number of points to draw
    675  *
    676  *  \return 0 on success, or -1 on error
    677  */
    678 extern DECLSPEC int SDLCALL SDL_RenderDrawPoints(SDL_Renderer * renderer,
    679                                                  const SDL_Point * points,
    680                                                  int count);
    681 
    682 /**
    683  *  \brief Draw a line on the current rendering target.
    684  *
    685  *  \param renderer The renderer which should draw a line.
    686  *  \param x1 The x coordinate of the start point.
    687  *  \param y1 The y coordinate of the start point.
    688  *  \param x2 The x coordinate of the end point.
    689  *  \param y2 The y coordinate of the end point.
    690  *
    691  *  \return 0 on success, or -1 on error
    692  */
    693 extern DECLSPEC int SDLCALL SDL_RenderDrawLine(SDL_Renderer * renderer,
    694                                                int x1, int y1, int x2, int y2);
    695 
    696 /**
    697  *  \brief Draw a series of connected lines on the current rendering target.
    698  *
    699  *  \param renderer The renderer which should draw multiple lines.
    700  *  \param points The points along the lines
    701  *  \param count The number of points, drawing count-1 lines
    702  *
    703  *  \return 0 on success, or -1 on error
    704  */
    705 extern DECLSPEC int SDLCALL SDL_RenderDrawLines(SDL_Renderer * renderer,
    706                                                 const SDL_Point * points,
    707                                                 int count);
    708 
    709 /**
    710  *  \brief Draw a rectangle on the current rendering target.
    711  *
    712  *  \param renderer The renderer which should draw a rectangle.
    713  *  \param rect A pointer to the destination rectangle, or NULL to outline the entire rendering target.
    714  *
    715  *  \return 0 on success, or -1 on error
    716  */
    717 extern DECLSPEC int SDLCALL SDL_RenderDrawRect(SDL_Renderer * renderer,
    718                                                const SDL_Rect * rect);
    719 
    720 /**
    721  *  \brief Draw some number of rectangles on the current rendering target.
    722  *
    723  *  \param renderer The renderer which should draw multiple rectangles.
    724  *  \param rects A pointer to an array of destination rectangles.
    725  *  \param count The number of rectangles.
    726  *
    727  *  \return 0 on success, or -1 on error
    728  */
    729 extern DECLSPEC int SDLCALL SDL_RenderDrawRects(SDL_Renderer * renderer,
    730                                                 const SDL_Rect * rects,
    731                                                 int count);
    732 
    733 /**
    734  *  \brief Fill a rectangle on the current rendering target with the drawing color.
    735  *
    736  *  \param renderer The renderer which should fill a rectangle.
    737  *  \param rect A pointer to the destination rectangle, or NULL for the entire
    738  *              rendering target.
    739  *
    740  *  \return 0 on success, or -1 on error
    741  */
    742 extern DECLSPEC int SDLCALL SDL_RenderFillRect(SDL_Renderer * renderer,
    743                                                const SDL_Rect * rect);
    744 
    745 /**
    746  *  \brief Fill some number of rectangles on the current rendering target with the drawing color.
    747  *
    748  *  \param renderer The renderer which should fill multiple rectangles.
    749  *  \param rects A pointer to an array of destination rectangles.
    750  *  \param count The number of rectangles.
    751  *
    752  *  \return 0 on success, or -1 on error
    753  */
    754 extern DECLSPEC int SDLCALL SDL_RenderFillRects(SDL_Renderer * renderer,
    755                                                 const SDL_Rect * rects,
    756                                                 int count);
    757 
    758 /**
    759  *  \brief Copy a portion of the texture to the current rendering target.
    760  *
    761  *  \param renderer The renderer which should copy parts of a texture.
    762  *  \param texture The source texture.
    763  *  \param srcrect   A pointer to the source rectangle, or NULL for the entire
    764  *                   texture.
    765  *  \param dstrect   A pointer to the destination rectangle, or NULL for the
    766  *                   entire rendering target.
    767  *
    768  *  \return 0 on success, or -1 on error
    769  */
    770 extern DECLSPEC int SDLCALL SDL_RenderCopy(SDL_Renderer * renderer,
    771                                            SDL_Texture * texture,
    772                                            const SDL_Rect * srcrect,
    773                                            const SDL_Rect * dstrect);
    774 
    775 /**
    776  *  \brief Copy a portion of the source texture to the current rendering target, rotating it by angle around the given center
    777  *
    778  *  \param renderer The renderer which should copy parts of a texture.
    779  *  \param texture The source texture.
    780  *  \param srcrect   A pointer to the source rectangle, or NULL for the entire
    781  *                   texture.
    782  *  \param dstrect   A pointer to the destination rectangle, or NULL for the
    783  *                   entire rendering target.
    784  *  \param angle    An angle in degrees that indicates the rotation that will be applied to dstrect
    785  *  \param center   A pointer to a point indicating the point around which dstrect will be rotated (if NULL, rotation will be done aroud dstrect.w/2, dstrect.h/2)
    786  *  \param flip     An SDL_RendererFlip value stating which flipping actions should be performed on the texture
    787  *
    788  *  \return 0 on success, or -1 on error
    789  */
    790 extern DECLSPEC int SDLCALL SDL_RenderCopyEx(SDL_Renderer * renderer,
    791                                            SDL_Texture * texture,
    792                                            const SDL_Rect * srcrect,
    793                                            const SDL_Rect * dstrect,
    794                                            const double angle,
    795                                            const SDL_Point *center,
    796                                            const SDL_RendererFlip flip);
    797 
    798 /**
    799  *  \brief Read pixels from the current rendering target.
    800  *
    801  *  \param renderer The renderer from which pixels should be read.
    802  *  \param rect   A pointer to the rectangle to read, or NULL for the entire
    803  *                render target.
    804  *  \param format The desired format of the pixel data, or 0 to use the format
    805  *                of the rendering target
    806  *  \param pixels A pointer to be filled in with the pixel data
    807  *  \param pitch  The pitch of the pixels parameter.
    808  *
    809  *  \return 0 on success, or -1 if pixel reading is not supported.
    810  *
    811  *  \warning This is a very slow operation, and should not be used frequently.
    812  */
    813 extern DECLSPEC int SDLCALL SDL_RenderReadPixels(SDL_Renderer * renderer,
    814                                                  const SDL_Rect * rect,
    815                                                  Uint32 format,
    816                                                  void *pixels, int pitch);
    817 
    818 /**
    819  *  \brief Update the screen with rendering performed.
    820  */
    821 extern DECLSPEC void SDLCALL SDL_RenderPresent(SDL_Renderer * renderer);
    822 
    823 /**
    824  *  \brief Destroy the specified texture.
    825  *
    826  *  \sa SDL_CreateTexture()
    827  *  \sa SDL_CreateTextureFromSurface()
    828  */
    829 extern DECLSPEC void SDLCALL SDL_DestroyTexture(SDL_Texture * texture);
    830 
    831 /**
    832  *  \brief Destroy the rendering context for a window and free associated
    833  *         textures.
    834  *
    835  *  \sa SDL_CreateRenderer()
    836  */
    837 extern DECLSPEC void SDLCALL SDL_DestroyRenderer(SDL_Renderer * renderer);
    838 
    839 
    840 /**
    841  *  \brief Bind the texture to the current OpenGL/ES/ES2 context for use with
    842  *         OpenGL instructions.
    843  *
    844  *  \param texture  The SDL texture to bind
    845  *  \param texw     A pointer to a float that will be filled with the texture width
    846  *  \param texh     A pointer to a float that will be filled with the texture height
    847  *
    848  *  \return 0 on success, or -1 if the operation is not supported
    849  */
    850 extern DECLSPEC int SDLCALL SDL_GL_BindTexture(SDL_Texture *texture, float *texw, float *texh);
    851 
    852 /**
    853  *  \brief Unbind a texture from the current OpenGL/ES/ES2 context.
    854  *
    855  *  \param texture  The SDL texture to unbind
    856  *
    857  *  \return 0 on success, or -1 if the operation is not supported
    858  */
    859 extern DECLSPEC int SDLCALL SDL_GL_UnbindTexture(SDL_Texture *texture);
    860 
    861 
    862 /* Ends C function definitions when using C++ */
    863 #ifdef __cplusplus
    864 }
    865 #endif
    866 #include "close_code.h"
    867 
    868 #endif /* _SDL_render_h */
    869 
    870 /* vi: set ts=4 sw=4 expandtab: */
    871