SDL  2.0
testnative.c
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1 /*
2  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
3 
4  This software is provided 'as-is', without any express or implied
5  warranty. In no event will the authors be held liable for any damages
6  arising from the use of this software.
7 
8  Permission is granted to anyone to use this software for any purpose,
9  including commercial applications, and to alter it and redistribute it
10  freely.
11 */
12 /* Simple program: Create a native window and attach an SDL renderer */
13 
14 #include <stdio.h>
15 #include <stdlib.h> /* for srand() */
16 #include <time.h> /* for time() */
17 
18 #include "testnative.h"
19 
20 #define WINDOW_W 640
21 #define WINDOW_H 480
22 #define NUM_SPRITES 100
23 #define MAX_SPEED 1
24 
25 static NativeWindowFactory *factories[] = {
26 #ifdef TEST_NATIVE_WINDOWS
27  &WindowsWindowFactory,
28 #endif
29 #ifdef TEST_NATIVE_X11
30  &X11WindowFactory,
31 #endif
32 #ifdef TEST_NATIVE_COCOA
33  &CocoaWindowFactory,
34 #endif
35  NULL
36 };
37 static NativeWindowFactory *factory = NULL;
38 static void *native_window;
39 static SDL_Rect *positions, *velocities;
40 
41 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
42 static void
43 quit(int rc)
44 {
45  SDL_VideoQuit();
46  if (native_window) {
47  factory->DestroyNativeWindow(native_window);
48  }
49  exit(rc);
50 }
51 
52 SDL_Texture *
53 LoadSprite(SDL_Renderer *renderer, char *file)
54 {
55  SDL_Surface *temp;
56  SDL_Texture *sprite;
57 
58  /* Load the sprite image */
59  temp = SDL_LoadBMP(file);
60  if (temp == NULL) {
61  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
62  return 0;
63  }
64 
65  /* Set transparent pixel as the pixel at (0,0) */
66  if (temp->format->palette) {
67  SDL_SetColorKey(temp, 1, *(Uint8 *) temp->pixels);
68  }
69 
70  /* Create textures from the image */
71  sprite = SDL_CreateTextureFromSurface(renderer, temp);
72  if (!sprite) {
73  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
74  SDL_FreeSurface(temp);
75  return 0;
76  }
77  SDL_FreeSurface(temp);
78 
79  /* We're ready to roll. :) */
80  return sprite;
81 }
82 
83 void
84 MoveSprites(SDL_Renderer * renderer, SDL_Texture * sprite)
85 {
86  int sprite_w, sprite_h;
87  int i;
88  SDL_Rect viewport;
89  SDL_Rect *position, *velocity;
90 
91  /* Query the sizes */
92  SDL_RenderGetViewport(renderer, &viewport);
93  SDL_QueryTexture(sprite, NULL, NULL, &sprite_w, &sprite_h);
94 
95  /* Draw a gray background */
96  SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
97  SDL_RenderClear(renderer);
98 
99  /* Move the sprite, bounce at the wall, and draw */
100  for (i = 0; i < NUM_SPRITES; ++i) {
101  position = &positions[i];
102  velocity = &velocities[i];
103  position->x += velocity->x;
104  if ((position->x < 0) || (position->x >= (viewport.w - sprite_w))) {
105  velocity->x = -velocity->x;
106  position->x += velocity->x;
107  }
108  position->y += velocity->y;
109  if ((position->y < 0) || (position->y >= (viewport.h - sprite_h))) {
110  velocity->y = -velocity->y;
111  position->y += velocity->y;
112  }
113 
114  /* Blit the sprite onto the screen */
115  SDL_RenderCopy(renderer, sprite, NULL, position);
116  }
117 
118  /* Update the screen! */
119  SDL_RenderPresent(renderer);
120 }
121 
122 int
123 main(int argc, char *argv[])
124 {
125  int i, done;
126  const char *driver;
127  SDL_Window *window;
128  SDL_Renderer *renderer;
129  SDL_Texture *sprite;
130  int window_w, window_h;
131  int sprite_w, sprite_h;
132  SDL_Event event;
133 
134  /* Enable standard application logging */
135  SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
136 
137  if (SDL_VideoInit(NULL) < 0) {
138  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL video: %s\n",
139  SDL_GetError());
140  exit(1);
141  }
142  driver = SDL_GetCurrentVideoDriver();
143 
144  /* Find a native window driver and create a native window */
145  for (i = 0; factories[i]; ++i) {
146  if (SDL_strcmp(driver, factories[i]->tag) == 0) {
147  factory = factories[i];
148  break;
149  }
150  }
151  if (!factory) {
152  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't find native window code for %s driver\n",
153  driver);
154  quit(2);
155  }
156  SDL_Log("Creating native window for %s driver\n", driver);
157  native_window = factory->CreateNativeWindow(WINDOW_W, WINDOW_H);
158  if (!native_window) {
159  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create native window\n");
160  quit(3);
161  }
162  window = SDL_CreateWindowFrom(native_window);
163  if (!window) {
164  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create SDL window: %s\n", SDL_GetError());
165  quit(4);
166  }
167  SDL_SetWindowTitle(window, "SDL Native Window Test");
168 
169  /* Create the renderer */
170  renderer = SDL_CreateRenderer(window, -1, 0);
171  if (!renderer) {
172  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create renderer: %s\n", SDL_GetError());
173  quit(5);
174  }
175 
176  /* Clear the window, load the sprite and go! */
177  SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
178  SDL_RenderClear(renderer);
179 
180  sprite = LoadSprite(renderer, "icon.bmp");
181  if (!sprite) {
182  quit(6);
183  }
184 
185  /* Allocate memory for the sprite info */
186  SDL_GetWindowSize(window, &window_w, &window_h);
187  SDL_QueryTexture(sprite, NULL, NULL, &sprite_w, &sprite_h);
188  positions = (SDL_Rect *) SDL_malloc(NUM_SPRITES * sizeof(SDL_Rect));
189  velocities = (SDL_Rect *) SDL_malloc(NUM_SPRITES * sizeof(SDL_Rect));
190  if (!positions || !velocities) {
191  SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!\n");
192  quit(2);
193  }
194  srand(time(NULL));
195  for (i = 0; i < NUM_SPRITES; ++i) {
196  positions[i].x = rand() % (window_w - sprite_w);
197  positions[i].y = rand() % (window_h - sprite_h);
198  positions[i].w = sprite_w;
199  positions[i].h = sprite_h;
200  velocities[i].x = 0;
201  velocities[i].y = 0;
202  while (!velocities[i].x && !velocities[i].y) {
203  velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
204  velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
205  }
206  }
207 
208  /* Main render loop */
209  done = 0;
210  while (!done) {
211  /* Check for events */
212  while (SDL_PollEvent(&event)) {
213  switch (event.type) {
214  case SDL_WINDOWEVENT:
215  switch (event.window.event) {
216  case SDL_WINDOWEVENT_EXPOSED:
217  SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
218  SDL_RenderClear(renderer);
219  break;
220  }
221  break;
222  case SDL_QUIT:
223  done = 1;
224  break;
225  default:
226  break;
227  }
228  }
229  MoveSprites(renderer, sprite);
230  }
231 
232  quit(0);
233 
234  return 0; /* to prevent compiler warning */
235 }
236 
237 /* vi: set ts=4 sw=4 expandtab: */