/*

Simple DirectMedia Layer

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.

*/

/**

* \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

extern "C" {

#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

with the refresh rate */

SDL_RENDERER_TARGETTEXTURE = 0x00000008 /**< The renderer supports

rendering to texture */

} 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_TARGET /**< Texture can be used as a render target */

} 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 Flip constants for SDL_RenderCopyEx

*/

typedef enum

{

SDL_FLIP_NONE = 0x00000000, /**< Do not flip */

SDL_FLIP_HORIZONTAL = 0x00000001, /**< flip horizontally */

SDL_FLIP_VERTICAL = 0x00000002 /**< flip vertically */

} SDL_RendererFlip;

/**

* \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 */

/**

* 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);

/**

* \sa SDL_CreateRenderer()

*/

extern DECLSPEC int SDLCALL SDL_GetRenderDriverInfo(int index,

SDL_RendererInfo * info);

/**

* \brief 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

* \param window A pointer filled with the window, or NULL on error

* \param renderer A pointer filled with the renderer, or NULL on error

*

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

*/

extern DECLSPEC int SDLCALL SDL_CreateWindowAndRenderer(

int width, int height, Uint32 window_flags,

SDL_Window **window, SDL_Renderer **renderer);

/**

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

* initialize the first one supporting the requested flags.

* \param flags ::SDL_RendererFlags.

* \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.

* \sa SDL_CreateRenderer()

* \sa SDL_DestroyRenderer()

*/

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

/**

* \brief Get the renderer associated with a window.

*/

extern DECLSPEC SDL_Renderer * SDLCALL SDL_GetRenderer(SDL_Window * window);

/**

* \brief Get information about a rendering context.

*/

extern DECLSPEC int SDLCALL SDL_GetRendererInfo(SDL_Renderer * renderer,

SDL_RendererInfo * info);

/**

* \brief Get the output size of a rendering context.

*/

extern DECLSPEC int SDLCALL SDL_GetRendererOutputSize(SDL_Renderer * renderer,

int *w, int *h);

/**

* \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.

* \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 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

* \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.

* \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

* \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.

* \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.

* \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.

* update the entire texture.

* \param pixels The raw pixel data.

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

* \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 write-only pixel access.

*

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

* appropriately offset by the locked area.

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

* \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 Determines whether a window supports the use of render targets

*

* \param renderer The renderer that will be checked

*

* \return SDL_TRUE if supported, SDL_FALSE if not.

*/

extern DECLSPEC SDL_bool SDLCALL SDL_RenderTargetSupported(SDL_Renderer *renderer);

/**

* \brief Set a texture as the current rendering target.

*

* \param texture The targeted texture, which must be created with the SDL_TEXTUREACCESS_TARGET flag, or NULL for the default render target

*

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

*

* \sa SDL_GetRenderTarget()

*/

extern DECLSPEC int SDLCALL SDL_SetRenderTarget(SDL_Renderer *renderer,

SDL_Texture *texture);

/**

* \brief Get the current render target or NULL for the default render target.

*

* \return The current render target

*

* \sa SDL_SetRenderTarget()

*/

extern DECLSPEC SDL_Texture * SDLCALL SDL_GetRenderTarget(SDL_Renderer *renderer);

/**

* \brief Set device independent resolution for rendering

*

* \param w The width of the logical resolution

* \param h The height of the logical resolution

*

* 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 events in the window will be filtered

* and scaled so they seem to arrive within the logical resolution.

*

* rendering backend, it will be handled using the appropriate

* quality hints.

*

* \sa SDL_RenderGetLogicalSize()

* \sa SDL_RenderSetScale()

* \sa SDL_RenderSetViewport()

*/

extern DECLSPEC int SDLCALL SDL_RenderSetLogicalSize(SDL_Renderer * renderer, int w, int h);

/**

* \brief Get device independent resolution for rendering

*

* \param w A pointer filled with the width of the logical resolution

* \param h A pointer filled with the height of the logical resolution

*

* \sa SDL_RenderSetLogicalSize()

*/

/**

* \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.

*

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

*

*

* \sa SDL_RenderGetViewport()

* \sa SDL_RenderSetLogicalSize()

*/

extern DECLSPEC int SDLCALL SDL_RenderSetViewport(SDL_Renderer * renderer,

const SDL_Rect * rect);

/**

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

*

* \sa SDL_RenderSetViewport()

*/

extern DECLSPEC void SDLCALL SDL_RenderGetViewport(SDL_Renderer * renderer,

SDL_Rect * rect);

/**

* \brief Set the clip rectangle for the current target.

* \param rect A pointer to the rectangle to set as the clip rectangle, or

* NULL to disable clipping.

*

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

*

* \sa SDL_RenderGetClipRect()

*/

extern DECLSPEC int SDLCALL SDL_RenderSetClipRect(SDL_Renderer * renderer,

const SDL_Rect * rect);

/**

* \brief Get the clip rectangle for the current target.

* \param rect A pointer filled in with the current clip rectangle, or

* an empty rectangle if clipping is disabled.

*

* \sa SDL_RenderSetClipRect()

*/

extern DECLSPEC void SDLCALL SDL_RenderGetClipRect(SDL_Renderer * renderer,

SDL_Rect * rect);

/**

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

*

* \param scaleX The horizontal scaling factor

* \param scaleY The vertical scaling factor

*

* 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.

*

* rendering backend, it will be handled using the appropriate

* quality hints. For best results use integer scaling factors.

*

* \sa SDL_RenderGetScale()

* \sa SDL_RenderSetLogicalSize()

*/

extern DECLSPEC int SDLCALL SDL_RenderSetScale(SDL_Renderer * renderer,

float scaleX, float scaleY);

/**

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

*

* \param scaleX A pointer filled in with the horizontal scaling factor

* \param scaleY A pointer filled in with the vertical scaling factor

*

* \sa SDL_RenderSetScale()

*/

extern DECLSPEC void SDLCALL SDL_RenderGetScale(SDL_Renderer * renderer,

float *scaleX, float *scaleY);

/**

* \brief Set the color used for drawing operations (Rect, Line and Clear).

* \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.

* \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 (Rect, Line and Clear).

* \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.

* \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).

*

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

* \sa SDL_GetRenderDrawBlendMode()

*/

extern DECLSPEC int SDLCALL SDL_SetRenderDrawBlendMode(SDL_Renderer * renderer,

SDL_BlendMode blendMode);

/**

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

* \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.

*

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

*/

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.

* \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.

* \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.