Atlas - testrendercopyex.c
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1/*
2  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
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:  Move N sprites around on the screen as fast as possible */
13
14#include <SDL3/SDL_test_common.h>
15#include <SDL3/SDL_main.h>
16#include "testutils.h"
17
18#ifdef SDL_PLATFORM_EMSCRIPTEN
19#include <emscripten/emscripten.h>
20#endif
21
22#include <stdlib.h>
23
24static SDLTest_CommonState *state;
25
26typedef struct
27{
28    SDL_Window *window;
29    SDL_Renderer *renderer;
30    SDL_Texture *background;
31    SDL_Texture *sprite;
32    SDL_FRect sprite_rect;
33    int scale_direction;
34} DrawState;
35
36static DrawState *drawstates;
37static int done;
38
39/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
40static void
41quit(int rc)
42{
43    SDLTest_CommonQuit(state);
44    /* Let 'main()' return normally */
45    if (rc != 0) {
46        exit(rc);
47    }
48}
49
50static void Draw(DrawState *s)
51{
52    SDL_Rect viewport;
53    SDL_Texture *target;
54    SDL_FPoint *center = NULL;
55    SDL_FPoint origin = { 0.0f, 0.0f };
56
57    SDL_GetRenderViewport(s->renderer, &viewport);
58
59    target = SDL_CreateTexture(s->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, viewport.w, viewport.h);
60    SDL_SetRenderTarget(s->renderer, target);
61
62    /* Draw the background */
63    SDL_RenderTexture(s->renderer, s->background, NULL, NULL);
64
65    /* Scale and draw the sprite */
66    s->sprite_rect.w += s->scale_direction;
67    s->sprite_rect.h += s->scale_direction;
68    if (s->scale_direction > 0) {
69        center = &origin;
70        if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
71            s->scale_direction = -1;
72        }
73    } else {
74        if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
75            s->scale_direction = 1;
76        }
77    }
78    s->sprite_rect.x = (viewport.w - s->sprite_rect.w) / 2;
79    s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
80
81    SDL_RenderTextureRotated(s->renderer, s->sprite, NULL, &s->sprite_rect, (double)s->sprite_rect.w, center, SDL_FLIP_NONE);
82
83    SDL_SetRenderTarget(s->renderer, NULL);
84    SDL_RenderTexture(s->renderer, target, NULL, NULL);
85    SDL_DestroyTexture(target);
86
87    /* Update the screen! */
88    SDL_RenderPresent(s->renderer);
89    /* SDL_Delay(10); */
90}
91
92static void loop(void)
93{
94    int i;
95    SDL_Event event;
96
97    /* Check for events */
98
99    while (SDL_PollEvent(&event)) {
100        SDLTest_CommonEvent(state, &event, &done);
101    }
102    for (i = 0; i < state->num_windows; ++i) {
103        if (state->windows[i] == NULL) {
104            continue;
105        }
106        Draw(&drawstates[i]);
107    }
108#ifdef SDL_PLATFORM_EMSCRIPTEN
109    if (done) {
110        emscripten_cancel_main_loop();
111    }
112#endif
113}
114
115int main(int argc, char *argv[])
116{
117    int i;
118    int frames;
119    Uint64 then, now;
120
121    /* Initialize test framework */
122    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
123    if (!state) {
124        return 1;
125    }
126
127    if (!SDLTest_CommonDefaultArgs(state, argc, argv) || !SDLTest_CommonInit(state)) {
128        SDLTest_CommonQuit(state);
129        return 1;
130    }
131
132    drawstates = SDL_stack_alloc(DrawState, state->num_windows);
133    for (i = 0; i < state->num_windows; ++i) {
134        DrawState *drawstate = &drawstates[i];
135
136        drawstate->window = state->windows[i];
137        drawstate->renderer = state->renderers[i];
138        drawstate->sprite = LoadTexture(drawstate->renderer, "icon.png", true);
139        drawstate->background = LoadTexture(drawstate->renderer, "sample.png", false);
140        if (!drawstate->sprite || !drawstate->background) {
141            quit(2);
142        }
143        SDL_GetTextureSize(drawstate->sprite, &drawstate->sprite_rect.w, &drawstate->sprite_rect.h);
144        drawstate->scale_direction = 1;
145    }
146
147    /* Main render loop */
148    frames = 0;
149    then = SDL_GetTicks();
150    done = 0;
151
152#ifdef SDL_PLATFORM_EMSCRIPTEN
153    emscripten_set_main_loop(loop, 0, 1);
154#else
155    while (!done) {
156        ++frames;
157        loop();
158    }
159#endif
160    /* Print out some timing information */
161    now = SDL_GetTicks();
162    if (now > then) {
163        double fps = ((double)frames * 1000) / (now - then);
164        SDL_Log("%2.2f frames per second", fps);
165    }
166
167    SDL_stack_free(drawstates);
168
169    quit(0);
170    return 0;
171}
172
[FILE END]
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