This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
testsprite2.c
300 lines (274 loc) · 9.25 KB
1
2
3
/* Simple program: Move N sprites around on the screen as fast as possible */
#include <stdlib.h>
4
#include <stdio.h>
5
6
#include <time.h>
7
#include "common.h"
8
9
10
11
#define NUM_SPRITES 100
#define MAX_SPEED 1
12
static CommonState *state;
13
14
static int num_sprites;
static SDL_TextureID *sprites;
15
16
17
18
19
static SDL_bool cycle_color;
static SDL_bool cycle_alpha;
static int cycle_direction = 1;
static int current_alpha = 0;
static int current_color = 0;
20
21
22
static SDL_Rect *positions;
static SDL_Rect *velocities;
static int sprite_w, sprite_h;
23
24
static SDL_TextureBlendMode blendMode = SDL_TEXTUREBLENDMODE_MASK;
static SDL_TextureScaleMode scaleMode = SDL_TEXTURESCALEMODE_NONE;
25
26
27
28
29
30
31
32
33
34
35
36
37
38
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
if (sprites) {
SDL_free(sprites);
}
if (positions) {
SDL_free(positions);
}
if (velocities) {
SDL_free(velocities);
}
39
CommonQuit(state);
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
exit(rc);
}
int
LoadSprite(char *file)
{
int i;
SDL_Surface *temp;
/* Load the sprite image */
temp = SDL_LoadBMP(file);
if (temp == NULL) {
fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
return (-1);
}
sprite_w = temp->w;
sprite_h = temp->h;
/* Set transparent pixel as the pixel at (0,0) */
if (temp->format->palette) {
SDL_SetColorKey(temp, SDL_SRCCOLORKEY, *(Uint8 *) temp->pixels);
}
/* Create textures from the image */
64
65
for (i = 0; i < state->num_windows; ++i) {
SDL_SelectRenderer(state->windows[i]);
66
sprites[i] = SDL_CreateTextureFromSurface(0, temp);
67
68
69
70
71
if (!sprites[i]) {
fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());
SDL_FreeSurface(temp);
return (-1);
}
72
73
SDL_SetTextureBlendMode(sprites[i], blendMode);
SDL_SetTextureScaleMode(sprites[i], scaleMode);
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
}
SDL_FreeSurface(temp);
/* We're ready to roll. :) */
return (0);
}
void
MoveSprites(SDL_WindowID window, SDL_TextureID sprite)
{
int i, n;
int window_w, window_h;
SDL_Rect area, *position, *velocity;
SDL_SelectRenderer(window);
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
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
/* Cycle the color and alpha, if desired */
if (cycle_color) {
current_color += cycle_direction;
if (current_color < 0) {
current_color = 0;
cycle_direction = -cycle_direction;
}
if (current_color > 255) {
current_color = 255;
cycle_direction = -cycle_direction;
}
SDL_SetTextureColorMod(sprite, 255, (Uint8) current_color,
(Uint8) current_color);
}
if (cycle_alpha) {
current_alpha += cycle_direction;
if (current_alpha < 0) {
current_alpha = 0;
cycle_direction = -cycle_direction;
}
if (current_alpha > 255) {
current_alpha = 255;
cycle_direction = -cycle_direction;
}
SDL_SetTextureAlphaMod(sprite, (Uint8) current_alpha);
}
120
121
/* Move the sprite, bounce at the wall, and draw */
n = 0;
122
SDL_RenderFill(0xA0, 0xA0, 0xA0, 0xFF, NULL);
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
for (i = 0; i < num_sprites; ++i) {
position = &positions[i];
velocity = &velocities[i];
position->x += velocity->x;
if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {
velocity->x = -velocity->x;
position->x += velocity->x;
}
position->y += velocity->y;
if ((position->y < 0) || (position->y >= (window_h - sprite_w))) {
velocity->y = -velocity->y;
position->y += velocity->y;
}
/* Blit the sprite onto the screen */
138
SDL_RenderCopy(sprite, NULL, position);
139
140
141
142
143
144
145
146
147
148
149
150
151
}
/* Update the screen! */
SDL_RenderPresent();
}
int
main(int argc, char *argv[])
{
int i, done;
SDL_Event event;
Uint32 then, now, frames;
152
153
154
155
156
157
158
/* Initialize parameters */
num_sprites = NUM_SPRITES;
/* Initialize test framework */
state = CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
159
}
160
161
for (i = 1; i < argc;) {
int consumed;
162
163
164
consumed = CommonArg(state, i);
if (consumed == 0) {
165
166
167
168
consumed = -1;
if (SDL_strcasecmp(argv[i], "--blend") == 0) {
if (argv[i + 1]) {
if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
169
blendMode = SDL_TEXTUREBLENDMODE_NONE;
170
consumed = 2;
171
} else if (SDL_strcasecmp(argv[i + 1], "mask") == 0) {
172
blendMode = SDL_TEXTUREBLENDMODE_MASK;
173
consumed = 2;
174
} else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
175
blendMode = SDL_TEXTUREBLENDMODE_BLEND;
176
177
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
178
blendMode = SDL_TEXTUREBLENDMODE_ADD;
179
180
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
181
blendMode = SDL_TEXTUREBLENDMODE_MOD;
182
183
184
consumed = 2;
}
}
185
186
187
} else if (SDL_strcasecmp(argv[i], "--scale") == 0) {
if (argv[i + 1]) {
if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
188
scaleMode = SDL_TEXTURESCALEMODE_NONE;
189
190
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "fast") == 0) {
191
scaleMode = SDL_TEXTURESCALEMODE_FAST;
192
193
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "slow") == 0) {
194
scaleMode = SDL_TEXTURESCALEMODE_SLOW;
195
196
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "best") == 0) {
197
scaleMode = SDL_TEXTURESCALEMODE_BEST;
198
199
200
consumed = 2;
}
}
201
202
203
204
205
206
} else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
cycle_color = SDL_TRUE;
consumed = 1;
} else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
cycle_alpha = SDL_TRUE;
consumed = 1;
207
208
209
210
} else if (SDL_isdigit(*argv[i])) {
num_sprites = SDL_atoi(argv[i]);
consumed = 1;
}
211
}
212
if (consumed < 0) {
213
fprintf(stderr,
214
"Usage: %s %s [--blend none|mask|blend|add|mod] [--scale none|fast|slow|best] [--cyclecolor] [--cyclealpha]\n",
215
argv[0], CommonUsage(state));
216
217
quit(1);
}
218
i += consumed;
219
}
220
221
if (!CommonInit(state)) {
quit(2);
222
223
224
}
/* Create the windows, initialize the renderers, and load the textures */
225
226
227
sprites =
(SDL_TextureID *) SDL_malloc(state->num_windows * sizeof(*sprites));
if (!sprites) {
228
229
230
fprintf(stderr, "Out of memory!\n");
quit(2);
}
231
232
for (i = 0; i < state->num_windows; ++i) {
SDL_SelectRenderer(state->windows[i]);
233
SDL_RenderFill(0xA0, 0xA0, 0xA0, 0xFF, NULL);
234
235
236
237
238
239
240
241
242
243
244
245
246
}
if (LoadSprite("icon.bmp") < 0) {
quit(2);
}
/* Allocate memory for the sprite info */
positions = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));
velocities = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));
if (!positions || !velocities) {
fprintf(stderr, "Out of memory!\n");
quit(2);
}
srand(time(NULL));
247
if (scaleMode != SDL_TEXTURESCALEMODE_NONE) {
248
249
250
sprite_w += sprite_w / 2;
sprite_h += sprite_h / 2;
}
251
for (i = 0; i < num_sprites; ++i) {
252
253
positions[i].x = rand() % (state->window_w - sprite_w);
positions[i].y = rand() % (state->window_h - sprite_h);
254
255
256
257
258
259
260
261
262
263
positions[i].w = sprite_w;
positions[i].h = sprite_h;
velocities[i].x = 0;
velocities[i].y = 0;
while (!velocities[i].x && !velocities[i].y) {
velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
}
}
264
/* Main render loop */
265
266
267
268
269
270
271
frames = 0;
then = SDL_GetTicks();
done = 0;
while (!done) {
/* Check for events */
++frames;
while (SDL_PollEvent(&event)) {
272
CommonEvent(state, &event, &done);
273
274
275
276
277
switch (event.type) {
case SDL_WINDOWEVENT:
switch (event.window.event) {
case SDL_WINDOWEVENT_EXPOSED:
SDL_SelectRenderer(event.window.windowID);
278
SDL_RenderFill(0xA0, 0xA0, 0xA0, 0xFF, NULL);
279
280
281
282
283
284
285
break;
}
break;
default:
break;
}
}
286
287
for (i = 0; i < state->num_windows; ++i) {
MoveSprites(state->windows[i], sprites[i]);
288
289
290
291
292
293
294
295
296
297
298
299
300
}
}
/* Print out some timing information */
now = SDL_GetTicks();
if (now > then) {
printf("%2.2f frames per second\n",
((double) frames * 1000) / (now - then));
}
quit(0);
}
/* vi: set ts=4 sw=4 expandtab: */