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1928 lines (1821 loc) · 72.6 KB
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/**
* # CategoryRender
*
* 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 polygons and particle effects and in that case you
* should use SDL's OpenGL/Direct3D support or one of the many good 3D
* engines.
*
* These functions must be called from the main thread. See this bug for
* details: https://github.com/libsdl-org/SDL/issues/986
*/
#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
extern "C" {
#endif
/**
* Flags used when creating a rendering context
*/
typedef enum SDL_RendererFlags
{
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_RENDERER_TARGETTEXTURE = 0x00000008 /**< The renderer supports
rendering to texture */
} SDL_RendererFlags;
/**
* 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 maximum texture width */
int max_texture_height; /**< The maximum texture height */
} SDL_RendererInfo;
/**
* Vertex structure
*/
typedef struct SDL_Vertex
{
SDL_FPoint position; /**< Vertex position, in SDL_Renderer coordinates */
SDL_Color color; /**< Vertex color */
SDL_FPoint tex_coord; /**< Normalized texture coordinates, if needed */
} SDL_Vertex;
/**
* The scaling mode for a texture.
*/
typedef enum SDL_ScaleMode
{
SDL_ScaleModeNearest, /**< nearest pixel sampling */
SDL_ScaleModeLinear, /**< linear filtering */
SDL_ScaleModeBest /**< anisotropic filtering */
} SDL_ScaleMode;
/**
* The access pattern allowed for a texture.
*/
typedef enum SDL_TextureAccess
{
SDL_TEXTUREACCESS_STATIC, /**< Changes rarely, not lockable */
SDL_TEXTUREACCESS_STREAMING, /**< Changes frequently, lockable */
SDL_TEXTUREACCESS_TARGET /**< Texture can be used as a render target */
} SDL_TextureAccess;
/**
* The texture channel modulation used in SDL_RenderCopy().
*/
typedef enum SDL_TextureModulate
{
SDL_TEXTUREMODULATE_NONE = 0x00000000, /**< No modulation */
SDL_TEXTUREMODULATE_COLOR = 0x00000001, /**< srcC = srcC * color */
SDL_TEXTUREMODULATE_ALPHA = 0x00000002 /**< srcA = srcA * alpha */
} SDL_TextureModulate;
/**
* Flip constants for SDL_RenderCopyEx
*/
typedef enum SDL_RendererFlip
{
SDL_FLIP_NONE = 0x00000000, /**< Do not flip */
SDL_FLIP_HORIZONTAL = 0x00000001, /**< flip horizontally */
SDL_FLIP_VERTICAL = 0x00000002 /**< flip vertically */
} SDL_RendererFlip;
/**
* A structure representing rendering state
*/
struct SDL_Renderer;
typedef struct SDL_Renderer SDL_Renderer;
/**
* An efficient driver-specific representation of pixel data
*/
struct SDL_Texture;
typedef struct SDL_Texture SDL_Texture;
/* Function prototypes */
/**
* 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.
*
* There may be none if SDL was compiled without render support.
*
* \returns a number >= 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
* \sa SDL_GetRenderDriverInfo
*/
extern DECLSPEC int SDLCALL SDL_GetNumRenderDrivers(void);
/**
* Get info about a specific 2D rendering driver for the current display.
*
* \param index the index of the driver to query information about.
* \param info an SDL_RendererInfo structure to be filled with information on
* the rendering driver.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
* \sa SDL_GetNumRenderDrivers
*/
extern DECLSPEC int SDLCALL SDL_GetRenderDriverInfo(int index,
SDL_RendererInfo * info);
/**
* Create a window and default renderer.
*
* \param width the width of the window.
* \param height the height of the window.
* \param window_flags the flags used to create the window (see
* SDL_CreateWindow()).
* \param window a pointer filled with the window, or NULL on error.
* \param renderer a pointer filled with the renderer, or NULL on error.
* \returns 0 on success, or -1 on error; call SDL_GetError() for more
* information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
* \sa SDL_CreateWindow
*/
extern DECLSPEC int SDLCALL SDL_CreateWindowAndRenderer(
int width, int height, Uint32 window_flags,
SDL_Window **window, SDL_Renderer **renderer);
/**
* 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 0, or one or more SDL_RendererFlags OR'd together.
* \returns a valid rendering context or NULL if there was an error; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateSoftwareRenderer
* \sa SDL_DestroyRenderer
* \sa SDL_GetNumRenderDrivers
* \sa SDL_GetRendererInfo
*/
extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateRenderer(SDL_Window * window,
int index, Uint32 flags);
/**
* Create a 2D software rendering context for a surface.
*
* Two other API which can be used to create SDL_Renderer:
* SDL_CreateRenderer() and SDL_CreateWindowAndRenderer(). These can _also_
* create a software renderer, but they are intended to be used with an
* SDL_Window as the final destination and not an SDL_Surface.
*
* \param surface the SDL_Surface structure representing the surface where
* rendering is done.
* \returns a valid rendering context or NULL if there was an error; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
* \sa SDL_CreateWindowRenderer
* \sa SDL_DestroyRenderer
*/
extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateSoftwareRenderer(SDL_Surface * surface);
/**
* Get the renderer associated with a window.
*
* \param window the window to query.
* \returns the rendering context on success or NULL on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
*/
extern DECLSPEC SDL_Renderer * SDLCALL SDL_GetRenderer(SDL_Window * window);
/**
* Get the window associated with a renderer.
*
* \param renderer the renderer to query.
* \returns the window on success or NULL on failure; call SDL_GetError() for
* more information.
*
* \since This function is available since SDL 2.0.22.
*/
extern DECLSPEC SDL_Window * SDLCALL SDL_RenderGetWindow(SDL_Renderer *renderer);
/**
* Get information about a rendering context.
*
* \param renderer the rendering context.
* \param info an SDL_RendererInfo structure filled with information about the
* current renderer.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateRenderer
*/
extern DECLSPEC int SDLCALL SDL_GetRendererInfo(SDL_Renderer * renderer,
SDL_RendererInfo * info);
/**
* Get the output size in pixels of a rendering context.
*
* Due to high-dpi displays, you might end up with a rendering context that
* has more pixels than the window that contains it, so use this instead of
* SDL_GetWindowSize() to decide how much drawing area you have.
*
* \param renderer the rendering context.
* \param w an int filled with the width.
* \param h an int filled with the height.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetRenderer
*/
extern DECLSPEC int SDLCALL SDL_GetRendererOutputSize(SDL_Renderer * renderer,
int *w, int *h);
/**
* Create a texture for a rendering context.
*
* You can set the texture scaling method by setting
* `SDL_HINT_RENDER_SCALE_QUALITY` before creating the texture.
*
* \param renderer the rendering context.
* \param format one of the enumerated values in SDL_PixelFormatEnum.
* \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.
* \returns a pointer to the created texture or NULL if no rendering context
* was active, the format was unsupported, or the width or height
* were out of range; call SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateTextureFromSurface
* \sa SDL_DestroyTexture
* \sa SDL_QueryTexture
* \sa SDL_UpdateTexture
*/
extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTexture(SDL_Renderer * renderer,
Uint32 format,
int access, int w,
int h);
/**
* Create a texture from an existing surface.
*
* The surface is not modified or freed by this function.
*
* The SDL_TextureAccess hint for the created texture is
* `SDL_TEXTUREACCESS_STATIC`.
*
* The pixel format of the created texture may be different from the pixel
* format of the surface. Use SDL_QueryTexture() to query the pixel format of
* the texture.
*
* \param renderer the rendering context.
* \param surface the SDL_Surface structure containing pixel data used to fill
* the texture.
* \returns the created texture or NULL on failure; call SDL_GetError() for
* more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateTexture
* \sa SDL_DestroyTexture
* \sa SDL_QueryTexture
*/
extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTextureFromSurface(SDL_Renderer * renderer, SDL_Surface * surface);
/**
* Query the attributes of a texture.
*
* \param texture the texture to query.
* \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 (one of the SDL_PixelFormatEnum values). This argument
* can be NULL if you don't need this information.
* \param access a pointer filled in with the actual access to the texture
* (one of the SDL_TextureAccess values). This argument can be
* NULL if you don't need this information.
* \param w a pointer filled in with the width of the texture in pixels. This
* argument can be NULL if you don't need this information.
* \param h a pointer filled in with the height of the texture in pixels. This
* argument can be NULL if you don't need this information.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateTexture
*/
extern DECLSPEC int SDLCALL SDL_QueryTexture(SDL_Texture * texture,
Uint32 * format, int *access,
int *w, int *h);
/**
* Set an additional color value multiplied into render copy operations.
*
* When this texture is rendered, during the copy operation each source color
* channel is modulated by the appropriate color value according to the
* following formula:
*
* `srcC = srcC * (color / 255)`
*
* Color modulation is not always supported by the renderer; it will return -1
* if color modulation is not supported.
*
* \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.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureColorMod
* \sa SDL_SetTextureAlphaMod
*/
extern DECLSPEC int SDLCALL SDL_SetTextureColorMod(SDL_Texture * texture,
Uint8 r, Uint8 g, Uint8 b);
/**
* Get the additional color value multiplied into 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.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureAlphaMod
* \sa SDL_SetTextureColorMod
*/
extern DECLSPEC int SDLCALL SDL_GetTextureColorMod(SDL_Texture * texture,
Uint8 * r, Uint8 * g,
Uint8 * b);
/**
* Set an additional alpha value multiplied into render copy operations.
*
* When this texture is rendered, during the copy operation the source alpha
* value is modulated by this alpha value according to the following formula:
*
* `srcA = srcA * (alpha / 255)`
*
* Alpha modulation is not always supported by the renderer; it will return -1
* if alpha modulation is not supported.
*
* \param texture the texture to update.
* \param alpha the source alpha value multiplied into copy operations.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureAlphaMod
* \sa SDL_SetTextureColorMod
*/
extern DECLSPEC int SDLCALL SDL_SetTextureAlphaMod(SDL_Texture * texture,
Uint8 alpha);
/**
* Get the additional alpha value multiplied into render copy operations.
*
* \param texture the texture to query.
* \param alpha a pointer filled in with the current alpha value.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureColorMod
* \sa SDL_SetTextureAlphaMod
*/
extern DECLSPEC int SDLCALL SDL_GetTextureAlphaMod(SDL_Texture * texture,
Uint8 * alpha);
/**
* Set the blend mode for a texture, used by SDL_RenderCopy().
*
* If the blend mode is not supported, the closest supported mode is chosen
* and this function returns -1.
*
* \param texture the texture to update.
* \param blendMode the SDL_BlendMode to use for texture blending.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetTextureBlendMode
* \sa SDL_RenderCopy
*/
extern DECLSPEC int SDLCALL SDL_SetTextureBlendMode(SDL_Texture * texture,
SDL_BlendMode blendMode);
/**
* Get the blend mode used for texture copy operations.
*
* \param texture the texture to query.
* \param blendMode a pointer filled in with the current SDL_BlendMode.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_SetTextureBlendMode
*/
extern DECLSPEC int SDLCALL SDL_GetTextureBlendMode(SDL_Texture * texture,
SDL_BlendMode *blendMode);
/**
* Set the scale mode used for texture scale operations.
*
* If the scale mode is not supported, the closest supported mode is chosen.
*
* \param texture The texture to update.
* \param scaleMode the SDL_ScaleMode to use for texture scaling.
* \returns 0 on success, or -1 if the texture is not valid.
*
* \since This function is available since SDL 2.0.12.
*
* \sa SDL_GetTextureScaleMode
*/
extern DECLSPEC int SDLCALL SDL_SetTextureScaleMode(SDL_Texture * texture,
SDL_ScaleMode scaleMode);
/**
* Get the scale mode used for texture scale operations.
*
* \param texture the texture to query.
* \param scaleMode a pointer filled in with the current scale mode.
* \return 0 on success, or -1 if the texture is not valid.
*
* \since This function is available since SDL 2.0.12.
*
* \sa SDL_SetTextureScaleMode
*/
extern DECLSPEC int SDLCALL SDL_GetTextureScaleMode(SDL_Texture * texture,
SDL_ScaleMode *scaleMode);
/**
* Associate a user-specified pointer with a texture.
*
* \param texture the texture to update.
* \param userdata the pointer to associate with the texture.
* \returns 0 on success, or -1 if the texture is not valid.
*
* \since This function is available since SDL 2.0.18.
*
* \sa SDL_GetTextureUserData
*/
extern DECLSPEC int SDLCALL SDL_SetTextureUserData(SDL_Texture * texture,
void *userdata);
/**
* Get the user-specified pointer associated with a texture
*
* \param texture the texture to query.
* \return the pointer associated with the texture, or NULL if the texture is
* not valid.
*
* \since This function is available since SDL 2.0.18.
*
* \sa SDL_SetTextureUserData
*/
extern DECLSPEC void * SDLCALL SDL_GetTextureUserData(SDL_Texture * texture);
/**
* Update the given texture rectangle with new pixel data.
*
* The pixel data must be in the pixel format of the texture. Use
* SDL_QueryTexture() to query the pixel format of the texture.
*
* This is a fairly slow function, intended for use with static textures that
* do not change often.
*
* If the texture is intended to be updated often, it is preferred to create
* the texture as streaming and use the locking functions referenced below.
* While this function will work with streaming textures, for optimization
* reasons you may not get the pixels back if you lock the texture afterward.
*
* \param texture the texture to update.
* \param rect an SDL_Rect structure representing the area to update, or NULL
* to update the entire texture.
* \param pixels the raw pixel data in the format of the texture.
* \param pitch the number of bytes in a row of pixel data, including padding
* between lines.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_CreateTexture
* \sa SDL_LockTexture
* \sa SDL_UnlockTexture
*/
extern DECLSPEC int SDLCALL SDL_UpdateTexture(SDL_Texture * texture,
const SDL_Rect * rect,
const void *pixels, int pitch);
/**
* Update a rectangle within a planar YV12 or IYUV texture with new pixel
* data.
*
* You can use SDL_UpdateTexture() as long as your pixel data is a contiguous
* block of Y and U/V planes in the proper order, but this function is
* available if your pixel data is not contiguous.
*
* \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 Yplane the raw pixel data for the Y plane.
* \param Ypitch the number of bytes between rows of pixel data for the Y
* plane.
* \param Uplane the raw pixel data for the U plane.
* \param Upitch the number of bytes between rows of pixel data for the U
* plane.
* \param Vplane the raw pixel data for the V plane.
* \param Vpitch the number of bytes between rows of pixel data for the V
* plane.
* \returns 0 on success or -1 if the texture is not valid; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.1.
*
* \sa SDL_UpdateTexture
*/
extern DECLSPEC int SDLCALL SDL_UpdateYUVTexture(SDL_Texture * texture,
const SDL_Rect * rect,
const Uint8 *Yplane, int Ypitch,
const Uint8 *Uplane, int Upitch,
const Uint8 *Vplane, int Vpitch);
/**
* Update a rectangle within a planar NV12 or NV21 texture with new pixels.
*
* You can use SDL_UpdateTexture() as long as your pixel data is a contiguous
* block of NV12/21 planes in the proper order, but this function is available
* if your pixel data is not contiguous.
*
* \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 Yplane the raw pixel data for the Y plane.
* \param Ypitch the number of bytes between rows of pixel data for the Y
* plane.
* \param UVplane the raw pixel data for the UV plane.
* \param UVpitch the number of bytes between rows of pixel data for the UV
* plane.
* \return 0 on success, or -1 if the texture is not valid.
*
* \since This function is available since SDL 2.0.16.
*/
extern DECLSPEC int SDLCALL SDL_UpdateNVTexture(SDL_Texture * texture,
const SDL_Rect * rect,
const Uint8 *Yplane, int Ypitch,
const Uint8 *UVplane, int UVpitch);
/**
* Lock a portion of the texture for **write-only** pixel access.
*
* As an optimization, the pixels made available for editing don't necessarily
* contain the old texture data. This is a write-only operation, and if you
* need to keep a copy of the texture data you should do that at the
* application level.
*
* You must use SDL_UnlockTexture() to unlock the pixels and apply any
* changes.
*
* \param texture the texture to lock for access, which was created with
* `SDL_TEXTUREACCESS_STREAMING`.
* \param rect an SDL_Rect structure representing the area to lock for access;
* NULL to lock the entire texture.
* \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; the
* pitch is the length of one row in bytes.
* \returns 0 on success or a negative error code if the texture is not valid
* or was not created with `SDL_TEXTUREACCESS_STREAMING`; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_UnlockTexture
*/
extern DECLSPEC int SDLCALL SDL_LockTexture(SDL_Texture * texture,
const SDL_Rect * rect,
void **pixels, int *pitch);
/**
* Lock a portion of the texture for **write-only** pixel access, and expose
* it as a SDL surface.
*
* Besides providing an SDL_Surface instead of raw pixel data, this function
* operates like SDL_LockTexture.
*
* As an optimization, the pixels made available for editing don't necessarily
* contain the old texture data. This is a write-only operation, and if you
* need to keep a copy of the texture data you should do that at the
* application level.
*
* You must use SDL_UnlockTexture() to unlock the pixels and apply any
* changes.
*
* The returned surface is freed internally after calling SDL_UnlockTexture()
* or SDL_DestroyTexture(). The caller should not free it.
*
* \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 surface this is filled in with an SDL surface representing the
* locked area.
* \returns 0 on success, or -1 if the texture is not valid or was not created
* with `SDL_TEXTUREACCESS_STREAMING`.
*
* \since This function is available since SDL 2.0.12.
*
* \sa SDL_LockTexture
* \sa SDL_UnlockTexture
*/
extern DECLSPEC int SDLCALL SDL_LockTextureToSurface(SDL_Texture *texture,
const SDL_Rect *rect,
SDL_Surface **surface);
/**
* Unlock a texture, uploading the changes to video memory, if needed.
*
* **Warning**: Please note that SDL_LockTexture() is intended to be
* write-only; it will not guarantee the previous contents of the texture will
* be provided. You must fully initialize any area of a texture that you lock
* before unlocking it, as the pixels might otherwise be uninitialized memory.
*
* Which is to say: locking and immediately unlocking a texture can result in
* corrupted textures, depending on the renderer in use.
*
* \param texture a texture locked by SDL_LockTexture().
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_LockTexture
*/
extern DECLSPEC void SDLCALL SDL_UnlockTexture(SDL_Texture * texture);
/**
* Determine whether a renderer supports the use of render targets.
*
* \param renderer the renderer that will be checked.
* \returns SDL_TRUE if supported or SDL_FALSE if not.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_SetRenderTarget
*/
extern DECLSPEC SDL_bool SDLCALL SDL_RenderTargetSupported(SDL_Renderer *renderer);
/**
* Set a texture as the current rendering target.
*
* Before using this function, you should check the
* `SDL_RENDERER_TARGETTEXTURE` bit in the flags of SDL_RendererInfo to see if
* render targets are supported.
*
* The default render target is the window for which the renderer was created.
* To stop rendering to a texture and render to the window again, call this
* function with a NULL `texture`.
*
* \param renderer the rendering context.
* \param texture the targeted texture, which must be created with the
* `SDL_TEXTUREACCESS_TARGET` flag, or NULL to render to the
* window instead of a texture.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetRenderTarget
*/
extern DECLSPEC int SDLCALL SDL_SetRenderTarget(SDL_Renderer *renderer,
SDL_Texture *texture);
/**
* Get the current render target.
*
* The default render target is the window for which the renderer was created,
* and is reported a NULL here.
*
* \param renderer the rendering context.
* \returns the current render target or NULL for the default render target.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_SetRenderTarget
*/
extern DECLSPEC SDL_Texture * SDLCALL SDL_GetRenderTarget(SDL_Renderer *renderer);
/**
* Set a device independent resolution for rendering.
*
* This function uses the viewport and scaling functionality to allow a fixed
* logical resolution for rendering, regardless of the actual output
* resolution. If the actual output resolution doesn't have the same aspect
* ratio the output rendering will be centered within the output display.
*
* If the output display is a window, mouse and touch events in the window
* will be filtered and scaled so they seem to arrive within the logical
* resolution. The SDL_HINT_MOUSE_RELATIVE_SCALING hint controls whether
* relative motion events are also scaled.
*
* If this function results in scaling or subpixel drawing by the rendering
* backend, it will be handled using the appropriate quality hints.
*
* \param renderer the renderer for which resolution should be set.
* \param w the width of the logical resolution.
* \param h the height of the logical resolution.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderGetLogicalSize
*/
extern DECLSPEC int SDLCALL SDL_RenderSetLogicalSize(SDL_Renderer * renderer, int w, int h);
/**
* Get device independent resolution for rendering.
*
* When using the main rendering target (eg no target texture is set): this
* may return 0 for `w` and `h` if the SDL_Renderer has never had its logical
* size set by SDL_RenderSetLogicalSize(). Otherwise it returns the logical
* width and height.
*
* When using a target texture: Never return 0 for `w` and `h` at first. Then
* it returns the logical width and height that are set.
*
* \param renderer a rendering context.
* \param w an int to be filled with the width.
* \param h an int to be filled with the height.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderSetLogicalSize
*/
extern DECLSPEC void SDLCALL SDL_RenderGetLogicalSize(SDL_Renderer * renderer, int *w, int *h);
/**
* Set whether to force integer scales for resolution-independent rendering.
*
* This function restricts the logical viewport to integer values - that is,
* when a resolution is between two multiples of a logical size, the viewport
* size is rounded down to the lower multiple.
*
* \param renderer the renderer for which integer scaling should be set.
* \param enable enable or disable the integer scaling for rendering.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.5.
*
* \sa SDL_RenderGetIntegerScale
* \sa SDL_RenderSetLogicalSize
*/
extern DECLSPEC int SDLCALL SDL_RenderSetIntegerScale(SDL_Renderer * renderer,
SDL_bool enable);
/**
* Get whether integer scales are forced for resolution-independent rendering.
*
* \param renderer the renderer from which integer scaling should be queried.
* \returns SDL_TRUE if integer scales are forced or SDL_FALSE if not and on
* failure; call SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.5.
*
* \sa SDL_RenderSetIntegerScale
*/
extern DECLSPEC SDL_bool SDLCALL SDL_RenderGetIntegerScale(SDL_Renderer * renderer);
/**
* Set the drawing area for rendering on the current target.
*
* When the window is resized, the viewport is reset to fill the entire new
* window size.
*
* \param renderer the rendering context.
* \param rect the SDL_Rect structure representing the drawing area, or NULL
* to set the viewport to the entire target.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderGetViewport
*/
extern DECLSPEC int SDLCALL SDL_RenderSetViewport(SDL_Renderer * renderer,
const SDL_Rect * rect);
/**
* Get the drawing area for the current target.
*
* \param renderer the rendering context.
* \param rect an SDL_Rect structure filled in with the current drawing area.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderSetViewport
*/
extern DECLSPEC void SDLCALL SDL_RenderGetViewport(SDL_Renderer * renderer,
SDL_Rect * rect);
/**
* Set the clip rectangle for rendering on the specified target.
*
* \param renderer the rendering context for which clip rectangle should be
* set.
* \param rect an SDL_Rect structure representing the clip area, relative to
* the viewport, or NULL to disable clipping.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderGetClipRect
* \sa SDL_RenderIsClipEnabled
*/
extern DECLSPEC int SDLCALL SDL_RenderSetClipRect(SDL_Renderer * renderer,
const SDL_Rect * rect);
/**
* Get the clip rectangle for the current target.
*
* \param renderer the rendering context from which clip rectangle should be
* queried.
* \param rect an SDL_Rect structure filled in with the current clipping area
* or an empty rectangle if clipping is disabled.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderIsClipEnabled
* \sa SDL_RenderSetClipRect
*/
extern DECLSPEC void SDLCALL SDL_RenderGetClipRect(SDL_Renderer * renderer,
SDL_Rect * rect);
/**
* Get whether clipping is enabled on the given renderer.
*
* \param renderer the renderer from which clip state should be queried.
* \returns SDL_TRUE if clipping is enabled or SDL_FALSE if not; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.4.
*
* \sa SDL_RenderGetClipRect
* \sa SDL_RenderSetClipRect
*/
extern DECLSPEC SDL_bool SDLCALL SDL_RenderIsClipEnabled(SDL_Renderer * renderer);
/**
* Set the drawing scale for rendering on the current target.
*
* The drawing coordinates are scaled by the x/y scaling factors before they
* are used by the renderer. This allows resolution independent drawing with a
* single coordinate system.
*
* If this results in scaling or subpixel drawing by the rendering backend, it
* will be handled using the appropriate quality hints. For best results use
* integer scaling factors.
*
* \param renderer a rendering context.
* \param scaleX the horizontal scaling factor.
* \param scaleY the vertical scaling factor.
* \returns 0 on success or a negative error code on failure; call
* SDL_GetError() for more information.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderGetScale
* \sa SDL_RenderSetLogicalSize
*/
extern DECLSPEC int SDLCALL SDL_RenderSetScale(SDL_Renderer * renderer,
float scaleX, float scaleY);
/**
* Get the drawing scale for the current target.
*
* \param renderer the renderer from which drawing scale should be queried.
* \param scaleX a pointer filled in with the horizontal scaling factor.
* \param scaleY a pointer filled in with the vertical scaling factor.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_RenderSetScale
*/
extern DECLSPEC void SDLCALL SDL_RenderGetScale(SDL_Renderer * renderer,
float *scaleX, float *scaleY);
/**