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
|
/*
Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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.
*/
/* Simple program: Move N sprites around on the screen as fast as possible */
#include <SDL3/SDL_test_common.h>
#include <SDL3/SDL_main.h>
#include "testutils.h"
#ifdef SDL_PLATFORM_EMSCRIPTEN
#include <emscripten/emscripten.h>
#endif
#include <stdlib.h>
static SDLTest_CommonState *state;
typedef struct
{
SDL_Window *window;
SDL_Renderer *renderer;
SDL_Texture *background;
SDL_Texture *sprite;
SDL_FRect sprite_rect;
int scale_direction;
} DrawState;
static DrawState *drawstates;
static int done;
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
SDLTest_CommonQuit(state);
/* Let 'main()' return normally */
if (rc != 0) {
exit(rc);
}
}
static void Draw(DrawState *s)
{
SDL_Rect viewport;
SDL_Texture *target;
SDL_FPoint *center = NULL;
SDL_FPoint origin = { 0.0f, 0.0f };
SDL_GetRenderViewport(s->renderer, &viewport);
target = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, viewport.w, viewport.h);
SDL_SetRenderTarget(s->renderer, target);
/* Draw the background */
SDL_RenderTexture(s->renderer, s->background, NULL, NULL);
/* Scale and draw the sprite */
s->sprite_rect.w += s->scale_direction;
s->sprite_rect.h += s->scale_direction;
if (s->scale_direction > 0) {
center = &origin;
if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
s->scale_direction = -1;
}
} else {
if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
s->scale_direction = 1;
}
}
s->sprite_rect.x = (viewport.w - s->sprite_rect.w) / 2;
s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
SDL_RenderTextureRotated(s->renderer, s->sprite, NULL, &s->sprite_rect, (double)s->sprite_rect.w, center, SDL_FLIP_NONE);
SDL_SetRenderTarget(s->renderer, NULL);
SDL_RenderTexture(s->renderer, target, NULL, NULL);
SDL_DestroyTexture(target);
/* Update the screen! */
SDL_RenderPresent(s->renderer);
/* SDL_Delay(10); */
}
static void loop(void)
{
int i;
SDL_Event event;
/* Check for events */
while (SDL_PollEvent(&event)) {
SDLTest_CommonEvent(state, &event, &done);
}
for (i = 0; i < state->num_windows; ++i) {
if (state->windows[i] == NULL) {
continue;
}
Draw(&drawstates[i]);
}
#ifdef SDL_PLATFORM_EMSCRIPTEN
if (done) {
emscripten_cancel_main_loop();
}
#endif
}
int main(int argc, char *argv[])
{
int i;
int frames;
Uint64 then, now;
/* Initialize test framework */
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
}
if (!SDLTest_CommonDefaultArgs(state, argc, argv) || !SDLTest_CommonInit(state)) {
SDLTest_CommonQuit(state);
return 1;
}
drawstates = SDL_stack_alloc(DrawState, state->num_windows);
for (i = 0; i < state->num_windows; ++i) {
DrawState *drawstate = &drawstates[i];
drawstate->window = state->windows[i];
drawstate->renderer = state->renderers[i];
drawstate->sprite = LoadTexture(drawstate->renderer, "icon.bmp", true, NULL, NULL);
drawstate->background = LoadTexture(drawstate->renderer, "sample.bmp", false, NULL, NULL);
if (!drawstate->sprite || !drawstate->background) {
quit(2);
}
SDL_GetTextureSize(drawstate->sprite, &drawstate->sprite_rect.w, &drawstate->sprite_rect.h);
drawstate->scale_direction = 1;
}
/* Main render loop */
frames = 0;
then = SDL_GetTicks();
done = 0;
#ifdef SDL_PLATFORM_EMSCRIPTEN
emscripten_set_main_loop(loop, 0, 1);
#else
while (!done) {
++frames;
loop();
}
#endif
/* Print out some timing information */
now = SDL_GetTicks();
if (now > then) {
double fps = ((double)frames * 1000) / (now - then);
SDL_Log("%2.2f frames per second", fps);
}
SDL_stack_free(drawstates);
quit(0);
return 0;
}
|
