Atlas - testsoftwaretransparent.c
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[FILE BEGIN]
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#include <SDL3/SDL.h>
13#include <SDL3/SDL_main.h>
14#include <SDL3/SDL_test.h>
15
16#define SQUARE_SIZE 100.0f
17
18/* Draw opaque red squares at the four corners of the form, and draw a red square with an alpha value of 180 in the center of the form */
19static void draw(SDL_Renderer *renderer)
20{
21    SDL_FRect rect = { 0.0f, 0.0f, SQUARE_SIZE, SQUARE_SIZE };
22    int w, h;
23
24    SDL_GetCurrentRenderOutputSize(renderer, &w, &h);
25
26    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
27    SDL_RenderClear(renderer);
28
29    if (w >= 3 * SQUARE_SIZE && h >= 3 * SQUARE_SIZE) {
30        SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
31
32        rect.x = 0.0f;
33        rect.y = 0.0f;
34        SDL_RenderFillRect(renderer, &rect);
35
36        rect.y = h - SQUARE_SIZE;
37        SDL_RenderFillRect(renderer, &rect);
38
39        rect.x = w - SQUARE_SIZE;
40        SDL_RenderFillRect(renderer, &rect);
41
42        rect.y = 0.0f;
43        SDL_RenderFillRect(renderer, &rect);
44    }
45
46    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 180);
47    rect.x = (w - SQUARE_SIZE) / 2;
48    rect.y = (h - SQUARE_SIZE) / 2;
49    SDL_RenderFillRect(renderer, &rect);
50}
51
52int main(int argc, char *argv[])
53{
54    SDL_Window *window = NULL;
55    SDL_Renderer *renderer = NULL;
56    bool done = false;
57    SDL_Event event;
58    SDLTest_CommonState *state;
59
60    int return_code = 1;
61
62    state = SDLTest_CommonCreateState(argv, 0);
63    if (!state) {
64        return 1;
65    }
66
67    if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
68        goto quit;
69    }
70
71    window = SDL_CreateWindow("SDL Software Renderer Transparent Test", 800, 600, SDL_WINDOW_TRANSPARENT | SDL_WINDOW_RESIZABLE);
72    if (!window) {
73        SDL_Log("Couldn't create transparent window: %s", SDL_GetError());
74        goto quit;
75    }
76
77    /* Create a software renderer */
78    renderer = SDL_CreateRenderer(window, SDL_SOFTWARE_RENDERER);
79    if (!renderer) {
80        SDL_Log("Couldn't create renderer: %s", SDL_GetError());
81        goto quit;
82    }
83
84    /* Make sure we're setting the alpha channel while drawing */
85    SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE);
86
87    /* We're ready to go! */
88    while (!done) {
89        while (SDL_PollEvent(&event)) {
90            switch (event.type) {
91            case SDL_EVENT_KEY_DOWN:
92                if (event.key.key == SDLK_ESCAPE) {
93                    done = true;
94                }
95                break;
96            case SDL_EVENT_WINDOW_EXPOSED:
97                /* The software renderer is persistent, so only redraw as-needed */
98                draw(renderer);
99                break;
100            case SDL_EVENT_QUIT:
101                done = true;
102                break;
103            default:
104                break;
105            }
106        }
107
108        /* Show everything on the screen and wait a bit */
109        SDL_RenderPresent(renderer);
110        SDL_Delay(100);
111    }
112
113    /* Success! */
114    return_code = 0;
115
116quit:
117    SDL_DestroyRenderer(renderer);
118    SDL_DestroyWindow(window);
119    SDL_Quit();
120    SDLTest_CommonDestroyState(state);
121    return return_code;
122}
123
[FILE END]
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