This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
testdraw2.c
286 lines (257 loc) · 8.59 KB
1
2
/* Simple program: draw as many random objects on the screen as possible */
3
4
5
6
7
8
9
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "common.h"
10
#define NUM_OBJECTS 100
11
12
static CommonState *state;
13
static int num_objects;
14
15
16
17
18
19
20
static SDL_bool cycle_color;
static SDL_bool cycle_alpha;
static int cycle_direction = 1;
static int current_alpha = 255;
static int current_color = 255;
static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
21
22
23
24
25
26
27
28
29
30
31
void
DrawPoints(SDL_WindowID window)
{
int i;
int x, y;
int window_w, window_h;
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
SDL_SetRenderDrawBlendMode(blendMode);
32
for (i = 0; i < num_objects * 4; ++i) {
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
/* 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;
}
}
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_SetRenderDrawColor(255, (Uint8) current_color,
(Uint8) current_color, (Uint8) current_alpha);
x = rand() % window_w;
y = rand() % window_h;
SDL_RenderPoint(x, y);
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
}
66
67
68
void
DrawLines(SDL_WindowID window)
{
69
int i;
70
71
72
73
74
75
76
int x1, y1, x2, y2;
int window_w, window_h;
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
SDL_SetRenderDrawBlendMode(blendMode);
77
for (i = 0; i < num_objects; ++i) {
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
/* 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;
}
}
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_SetRenderDrawColor(255, (Uint8) current_color,
(Uint8) current_color, (Uint8) current_alpha);
104
if (i == 0) {
105
106
107
108
SDL_RenderLine(0, 0, window_w - 1, window_h - 1);
SDL_RenderLine(0, window_h - 1, window_w - 1, 0);
SDL_RenderLine(0, window_h / 2, window_w - 1, window_h / 2);
SDL_RenderLine(window_w / 2, 0, window_w / 2, window_h - 1);
109
110
111
112
113
114
115
} else {
x1 = rand() % window_w;
x2 = rand() % window_w;
y1 = rand() % window_h;
y2 = rand() % window_h;
SDL_RenderLine(x1, y1, x2, y2);
}
116
117
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
118
119
120
121
122
123
124
125
}
void
DrawRects(SDL_WindowID window)
{
int i;
SDL_Rect rect;
int window_w, window_h;
126
127
128
129
130
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
SDL_SetRenderDrawBlendMode(blendMode);
131
for (i = 0; i < num_objects / 4; ++i) {
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
/* 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;
}
}
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_SetRenderDrawColor(255, (Uint8) current_color,
(Uint8) current_color, (Uint8) current_alpha);
rect.w = rand() % (window_h / 2);
rect.h = rand() % (window_h / 2);
rect.x = (rand() % window_w) - (rect.w / 2);
rect.y = (rand() % window_w) - (rect.h / 2);
162
SDL_RenderRect(&rect);
163
164
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
165
166
167
168
169
170
171
172
173
174
}
int
main(int argc, char *argv[])
{
int i, done;
SDL_Event event;
Uint32 then, now, frames;
/* Initialize parameters */
175
num_objects = NUM_OBJECTS;
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
/* Initialize test framework */
state = CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
}
for (i = 1; i < argc;) {
int consumed;
consumed = CommonArg(state, i);
if (consumed == 0) {
consumed = -1;
if (SDL_strcasecmp(argv[i], "--blend") == 0) {
if (argv[i + 1]) {
if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
blendMode = SDL_BLENDMODE_NONE;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "mask") == 0) {
blendMode = SDL_BLENDMODE_MASK;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
blendMode = SDL_BLENDMODE_BLEND;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
blendMode = SDL_BLENDMODE_ADD;
consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
blendMode = SDL_BLENDMODE_MOD;
consumed = 2;
}
}
} 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;
} else if (SDL_isdigit(*argv[i])) {
214
num_objects = SDL_atoi(argv[i]);
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
consumed = 1;
}
}
if (consumed < 0) {
fprintf(stderr,
"Usage: %s %s [--blend none|mask|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
argv[0], CommonUsage(state));
return 1;
}
i += consumed;
}
if (!CommonInit(state)) {
return 2;
}
/* Create the windows and initialize the renderers */
for (i = 0; i < state->num_windows; ++i) {
SDL_SelectRenderer(state->windows[i]);
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
234
SDL_RenderRect(NULL);
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
}
srand(time(NULL));
/* Main render loop */
frames = 0;
then = SDL_GetTicks();
done = 0;
while (!done) {
/* Check for events */
++frames;
while (SDL_PollEvent(&event)) {
CommonEvent(state, &event, &done);
switch (event.type) {
case SDL_WINDOWEVENT:
switch (event.window.event) {
case SDL_WINDOWEVENT_EXPOSED:
SDL_SelectRenderer(event.window.windowID);
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
254
SDL_RenderRect(NULL);
255
256
257
258
259
260
261
262
break;
}
break;
default:
break;
}
}
for (i = 0; i < state->num_windows; ++i) {
263
264
SDL_SelectRenderer(state->windows[i]);
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
265
SDL_RenderRect(NULL);
266
267
DrawRects(state->windows[i]);
268
DrawLines(state->windows[i]);
269
270
271
DrawPoints(state->windows[i]);
SDL_RenderPresent();
272
273
274
}
}
275
276
CommonQuit(state);
277
278
279
280
281
282
283
284
285
286
/* Print out some timing information */
now = SDL_GetTicks();
if (now > then) {
double fps = ((double) frames * 1000) / (now - then);
printf("%2.2f frames per second\n", fps);
}
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */