This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_render.h
600 lines (543 loc) · 21.2 KB
/
SDL_render.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2011 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
/**
* \file SDL_render.h
*
* Header file for SDL 2D rendering functions.
*
* This API supports the following features:
* * single pixel points
* * single pixel lines
* * filled rectangles
* * texture images
*
* The primitives may be drawn in opaque, blended, or additive modes.
*
* The texture images may be drawn in opaque, blended, or additive modes.
* They can have an additional color tint or alpha modulation applied to
* them, and may also be stretched with linear interpolation.
*
* This API is designed to accelerate simple 2D operations. You may
* want more functionality such as rotation and particle effects and
* in that case you should use SDL's OpenGL/Direct3D support or one
* of the many good 3D engines.
*/
#ifndef _SDL_render_h
#define _SDL_render_h
#include "SDL_stdinc.h"
#include "SDL_rect.h"
#include "SDL_video.h"
#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#endif
/**
* \brief Flags used when creating a rendering context
*/
typedef enum
{
SDL_RENDERER_ACCELERATED = 0x00000001, /**< The renderer uses hardware
acceleration */
SDL_RENDERER_PRESENTVSYNC = 0x00000002 /**< Present is synchronized
with the refresh rate */
} SDL_RendererFlags;
/**
* \brief Information on the capabilities of a render driver or context.
*/
typedef struct SDL_RendererInfo
{
const char *name; /**< The name of the renderer */
Uint32 flags; /**< Supported ::SDL_RendererFlags */
Uint32 num_texture_formats; /**< The number of available texture formats */
Uint32 texture_formats[16]; /**< The available texture formats */
int max_texture_width; /**< The maximimum texture width */
int max_texture_height; /**< The maximimum texture height */
} SDL_RendererInfo;
/**
* \brief The access pattern allowed for a texture.
*/
typedef enum
{
SDL_TEXTUREACCESS_STATIC, /**< Changes rarely, not lockable */
SDL_TEXTUREACCESS_STREAMING /**< Changes frequently, lockable */
} SDL_TextureAccess;
/**
* \brief The texture channel modulation used in SDL_RenderCopy().
*/
typedef enum
{
SDL_TEXTUREMODULATE_NONE = 0x00000000, /**< No modulation */
SDL_TEXTUREMODULATE_COLOR = 0x00000001, /**< srcC = srcC * color */
SDL_TEXTUREMODULATE_ALPHA = 0x00000002 /**< srcA = srcA * alpha */
} SDL_TextureModulate;
/**
* \brief A structure representing rendering state
*/
struct SDL_Renderer;
typedef struct SDL_Renderer SDL_Renderer;
/**
* \brief An efficient driver-specific representation of pixel data
*/
struct SDL_Texture;
typedef struct SDL_Texture SDL_Texture;
/* Function prototypes */
/**
* \brief Get the number of 2D rendering drivers available for the current
* display.
*
* A render driver is a set of code that handles rendering and texture
* management on a particular display. Normally there is only one, but
* some drivers may have several available with different capabilities.
*
* \sa SDL_GetRenderDriverInfo()
* \sa SDL_CreateRenderer()
*/
extern DECLSPEC int SDLCALL SDL_GetNumRenderDrivers(void);
/**
* \brief Get information about a specific 2D rendering driver for the current
* display.
*
* \param index The index of the driver to query information about.
* \param info A pointer to an SDL_RendererInfo struct to be filled with
* information on the rendering driver.
*
* \return 0 on success, -1 if the index was out of range.
*
* \sa SDL_CreateRenderer()
*/
extern DECLSPEC int SDLCALL SDL_GetRenderDriverInfo(int index,
SDL_RendererInfo * info);
/**
* \brief Create a 2D rendering context for a window.
*
* \param window The window where rendering is displayed.
* \param index The index of the rendering driver to initialize, or -1 to
* initialize the first one supporting the requested flags.
* \param flags ::SDL_RendererFlags.
*
* \return A valid rendering context or NULL if there was an error.
*
* \sa SDL_CreateSoftwareRenderer()
* \sa SDL_GetRendererInfo()
* \sa SDL_DestroyRenderer()
*/
extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateRenderer(SDL_Window * window,
int index, Uint32 flags);
/**
* \brief Create a 2D software rendering context for a surface.
*
* \param surface The surface where rendering is done.
*
* \return A valid rendering context or NULL if there was an error.
*
* \sa SDL_CreateRenderer()
* \sa SDL_DestroyRenderer()
*/
extern DECLSPEC SDL_Renderer * SDLCALL SDL_CreateSoftwareRenderer(SDL_Surface * surface);
/**
* \brief Get information about a rendering context.
*/
extern DECLSPEC int SDLCALL SDL_GetRendererInfo(SDL_Renderer * renderer,
SDL_RendererInfo * info);
/**
* \brief Create a texture for a rendering context.
*
* \param format The format of the texture.
* \param access One of the enumerated values in ::SDL_TextureAccess.
* \param w The width of the texture in pixels.
* \param h The height of the texture in pixels.
*
* \return The created texture is returned, or 0 if no rendering context was
* active, the format was unsupported, or the width or height were out
* of range.
*
* \sa SDL_QueryTexture()
* \sa SDL_UpdateTexture()
* \sa SDL_DestroyTexture()
*/
extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTexture(SDL_Renderer * renderer, Uint32 format,
int access, int w,
int h);
/**
* \brief Create a texture from an existing surface.
*
* \param surface The surface containing pixel data used to fill the texture.
*
* \return The created texture is returned, or 0 on error.
*
* \note The surface is not modified or freed by this function.
*
* \sa SDL_QueryTexture()
* \sa SDL_DestroyTexture()
*/
extern DECLSPEC SDL_Texture * SDLCALL SDL_CreateTextureFromSurface(SDL_Renderer * renderer, SDL_Surface * surface);
/**
* \brief Query the attributes of a texture
*
* \param texture A texture to be queried.
* \param format A pointer filled in with the raw format of the texture. The
* actual format may differ, but pixel transfers will use this
* format.
* \param access A pointer filled in with the actual access to the texture.
* \param w A pointer filled in with the width of the texture in pixels.
* \param h A pointer filled in with the height of the texture in pixels.
*
* \return 0 on success, or -1 if the texture is not valid.
*/
extern DECLSPEC int SDLCALL SDL_QueryTexture(SDL_Texture * texture,
Uint32 * format, int *access,
int *w, int *h);
/**
* \brief Set an additional color value used in render copy operations.
*
* \param texture The texture to update.
* \param r The red color value multiplied into copy operations.
* \param g The green color value multiplied into copy operations.
* \param b The blue color value multiplied into copy operations.
*
* \return 0 on success, or -1 if the texture is not valid or color modulation
* is not supported.
*
* \sa SDL_GetTextureColorMod()
*/
extern DECLSPEC int SDLCALL SDL_SetTextureColorMod(SDL_Texture * texture,
Uint8 r, Uint8 g, Uint8 b);
/**
* \brief Get the additional color value used in render copy operations.
*
* \param texture The texture to query.
* \param r A pointer filled in with the current red color value.
* \param g A pointer filled in with the current green color value.
* \param b A pointer filled in with the current blue color value.
*
* \return 0 on success, or -1 if the texture is not valid.
*
* \sa SDL_SetTextureColorMod()
*/
extern DECLSPEC int SDLCALL SDL_GetTextureColorMod(SDL_Texture * texture,
Uint8 * r, Uint8 * g,
Uint8 * b);
/**
* \brief Set an additional alpha value used in render copy operations.
*
* \param texture The texture to update.
* \param alpha The alpha value multiplied into copy operations.
*
* \return 0 on success, or -1 if the texture is not valid or alpha modulation
* is not supported.
*
* \sa SDL_GetTextureAlphaMod()
*/
extern DECLSPEC int SDLCALL SDL_SetTextureAlphaMod(SDL_Texture * texture,
Uint8 alpha);
/**
* \brief Get the additional alpha value used in render copy operations.
*
* \param texture The texture to query.
* \param alpha A pointer filled in with the current alpha value.
*
* \return 0 on success, or -1 if the texture is not valid.
*
* \sa SDL_SetTextureAlphaMod()
*/
extern DECLSPEC int SDLCALL SDL_GetTextureAlphaMod(SDL_Texture * texture,
Uint8 * alpha);
/**
* \brief Set the blend mode used for texture copy operations.
*
* \param texture The texture to update.
* \param blendMode ::SDL_BlendMode to use for texture blending.
*
* \return 0 on success, or -1 if the texture is not valid or the blend mode is
* not supported.
*
* \note If the blend mode is not supported, the closest supported mode is
* chosen.
*
* \sa SDL_GetTextureBlendMode()
*/
extern DECLSPEC int SDLCALL SDL_SetTextureBlendMode(SDL_Texture * texture,
SDL_BlendMode blendMode);
/**
* \brief Get the blend mode used for texture copy operations.
*
* \param texture The texture to query.
* \param blendMode A pointer filled in with the current blend mode.
*
* \return 0 on success, or -1 if the texture is not valid.
*
* \sa SDL_SetTextureBlendMode()
*/
extern DECLSPEC int SDLCALL SDL_GetTextureBlendMode(SDL_Texture * texture,
SDL_BlendMode *blendMode);
/**
* \brief Update the given texture rectangle with new pixel data.
*
* \param texture The texture to update
* \param rect A pointer to the rectangle of pixels to update, or NULL to
* update the entire texture.
* \param pixels The raw pixel data.
* \param pitch The number of bytes between rows of pixel data.
*
* \return 0 on success, or -1 if the texture is not valid.
*
* \note This is a fairly slow function.
*/
extern DECLSPEC int SDLCALL SDL_UpdateTexture(SDL_Texture * texture,
const SDL_Rect * rect,
const void *pixels, int pitch);
/**
* \brief Lock a portion of the texture for pixel access.
*
* \param texture The texture to lock for access, which was created with
* ::SDL_TEXTUREACCESS_STREAMING.
* \param rect A pointer to the rectangle to lock for access. If the rect
* is NULL, the entire texture will be locked.
* \param pixels This is filled in with a pointer to the locked pixels,
* appropriately offset by the locked area.
* \param pitch This is filled in with the pitch of the locked pixels.
*
* \return 0 on success, or -1 if the texture is not valid or was not created with ::SDL_TEXTUREACCESS_STREAMING.
*
* \sa SDL_UnlockTexture()
*/
extern DECLSPEC int SDLCALL SDL_LockTexture(SDL_Texture * texture,
const SDL_Rect * rect,
void **pixels, int *pitch);
/**
* \brief Unlock a texture, uploading the changes to video memory, if needed.
*
* \sa SDL_LockTexture()
*/
extern DECLSPEC void SDLCALL SDL_UnlockTexture(SDL_Texture * texture);
/**
* \brief Set the clipping rectangle for rendering on the current target
*
* \param rect The rectangle to clip rendering to, or NULL to disable clipping.
*
* The contents of the window are not defined after calling
* SDL_RenderPresent(), so you should clear the clip rectangle and draw
* over the entire window each frame.
*/
extern DECLSPEC void SDLCALL SDL_RenderSetClipRect(SDL_Renderer * renderer,
const SDL_Rect * rect);
/**
* \brief Set the color used for drawing operations (Fill and Line).
*
* \param r The red value used to draw on the rendering target.
* \param g The green value used to draw on the rendering target.
* \param b The blue value used to draw on the rendering target.
* \param a The alpha value used to draw on the rendering target, usually
* ::SDL_ALPHA_OPAQUE (255).
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDL_SetRenderDrawColor(SDL_Renderer * renderer,
Uint8 r, Uint8 g, Uint8 b,
Uint8 a);
/**
* \brief Get the color used for drawing operations (Fill and Line).
*
* \param r A pointer to the red value used to draw on the rendering target.
* \param g A pointer to the green value used to draw on the rendering target.
* \param b A pointer to the blue value used to draw on the rendering target.
* \param a A pointer to the alpha value used to draw on the rendering target,
* usually ::SDL_ALPHA_OPAQUE (255).
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDL_GetRenderDrawColor(SDL_Renderer * renderer,
Uint8 * r, Uint8 * g, Uint8 * b,
Uint8 * a);
/**
* \brief Set the blend mode used for drawing operations (Fill and Line).
*
* \param blendMode ::SDL_BlendMode to use for blending.
*
* \return 0 on success, or -1 on error
*
* \note If the blend mode is not supported, the closest supported mode is
* chosen.
*
* \sa SDL_GetRenderDrawBlendMode()
*/
extern DECLSPEC int SDLCALL SDL_SetRenderDrawBlendMode(SDL_Renderer * renderer,
SDL_BlendMode blendMode);
/**
* \brief Get the blend mode used for drawing operations.
*
* \param blendMode A pointer filled in with the current blend mode.
*
* \return 0 on success, or -1 on error
*
* \sa SDL_SetRenderDrawBlendMode()
*/
extern DECLSPEC int SDLCALL SDL_GetRenderDrawBlendMode(SDL_Renderer * renderer,
SDL_BlendMode *blendMode);
/**
* \brief Clear the current rendering target with the drawing color
*/
extern DECLSPEC int SDLCALL SDL_RenderClear(SDL_Renderer * renderer);
/**
* \brief Draw a point on the current rendering target.
*
* \param x The x coordinate of the point.
* \param y The y coordinate of the point.
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderDrawPoint(SDL_Renderer * renderer,
int x, int y);
/**
* \brief Draw multiple points on the current rendering target.
*
* \param points The points to draw
* \param count The number of points to draw
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderDrawPoints(SDL_Renderer * renderer,
const SDL_Point * points,
int count);
/**
* \brief Draw a line on the current rendering target.
*
* \param x1 The x coordinate of the start point.
* \param y1 The y coordinate of the start point.
* \param x2 The x coordinate of the end point.
* \param y2 The y coordinate of the end point.
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderDrawLine(SDL_Renderer * renderer,
int x1, int y1, int x2, int y2);
/**
* \brief Draw a series of connected lines on the current rendering target.
*
* \param points The points along the lines
* \param count The number of points, drawing count-1 lines
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderDrawLines(SDL_Renderer * renderer,
const SDL_Point * points,
int count);
/**
* \brief Draw a rectangle on the current rendering target.
*
* \param rect A pointer to the destination rectangle, or NULL to outline the entire rendering target.
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderDrawRect(SDL_Renderer * renderer,
const SDL_Rect * rect);
/**
* \brief Draw some number of rectangles on the current rendering target.
*
* \param rects A pointer to an array of destination rectangles.
* \param count The number of rectangles.
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderDrawRects(SDL_Renderer * renderer,
const SDL_Rect ** rects,
int count);
/**
* \brief Fill a rectangle on the current rendering target with the drawing color.
*
* \param rect A pointer to the destination rectangle, or NULL for the entire
* rendering target.
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderFillRect(SDL_Renderer * renderer,
const SDL_Rect * rect);
/**
* \brief Fill some number of rectangles on the current rendering target with the drawing color.
*
* \param rects A pointer to an array of destination rectangles.
* \param count The number of rectangles.
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderFillRects(SDL_Renderer * renderer,
const SDL_Rect ** rect,
int count);
/**
* \brief Copy a portion of the texture to the current rendering target.
*
* \param texture The source texture.
* \param srcrect A pointer to the source rectangle, or NULL for the entire
* texture.
* \param dstrect A pointer to the destination rectangle, or NULL for the
* entire rendering target.
*
* \return 0 on success, or -1 on error
*/
extern DECLSPEC int SDLCALL SDL_RenderCopy(SDL_Renderer * renderer,
SDL_Texture * texture,
const SDL_Rect * srcrect,
const SDL_Rect * dstrect);
/**
* \brief Read pixels from the current rendering target.
*
* \param rect A pointer to the rectangle to read, or NULL for the entire
* render target.
* \param format The desired format of the pixel data, or 0 to use the format
* of the rendering target
* \param pixels A pointer to be filled in with the pixel data
* \param pitch The pitch of the pixels parameter.
*
* \return 0 on success, or -1 if pixel reading is not supported.
*
* \warning This is a very slow operation, and should not be used frequently.
*/
extern DECLSPEC int SDLCALL SDL_RenderReadPixels(SDL_Renderer * renderer,
const SDL_Rect * rect,
Uint32 format,
void *pixels, int pitch);
/**
* \brief Update the screen with rendering performed.
*/
extern DECLSPEC void SDLCALL SDL_RenderPresent(SDL_Renderer * renderer);
/**
* \brief Destroy the specified texture.
*
* \sa SDL_CreateTexture()
* \sa SDL_CreateTextureFromSurface()
*/
extern DECLSPEC void SDLCALL SDL_DestroyTexture(SDL_Texture * texture);
/**
* \brief Destroy the rendering context for a window and free associated
* textures.
*
* \sa SDL_CreateRenderer()
*/
extern DECLSPEC void SDLCALL SDL_DestroyRenderer(SDL_Renderer * renderer);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"
#endif /* _SDL_render_h */
/* vi: set ts=4 sw=4 expandtab: */