2 Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
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.
8 Permission is granted to anyone to use this software for any purpose,
9 including commercial applications, and to alter it and redistribute it
13 /* Simple program: draw as many random objects on the screen as possible */
20 #include <emscripten/emscripten.h>
23 #include "SDL_test_common.h"
24 #define WINDOW_WIDTH 720
25 #define WINDOW_HEIGHT 1280
26 #define NUM_OBJECTS 100
28 static SDLTest_CommonState *state;
29 static int num_objects;
30 static SDL_bool cycle_color;
31 static SDL_bool cycle_alpha;
32 static int cycle_direction = 1;
33 static int current_alpha = 255;
34 static int current_color = 255;
35 static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
40 DrawPoints(SDL_Renderer * renderer)
47 SDL_RenderGetViewport(renderer, &viewport);
49 for (i = 0; i < num_objects * 4; ++i) {
50 /* Cycle the color and alpha, if desired */
52 current_color += cycle_direction;
53 if (current_color < 0) {
55 cycle_direction = -cycle_direction;
57 if (current_color > 255) {
59 cycle_direction = -cycle_direction;
63 current_alpha += cycle_direction;
64 if (current_alpha < 0) {
66 cycle_direction = -cycle_direction;
68 if (current_alpha > 255) {
70 cycle_direction = -cycle_direction;
73 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
74 (Uint8) current_color, (Uint8) current_alpha);
76 x = rand() % viewport.w;
77 y = rand() % viewport.h;
78 SDL_RenderDrawPoint(renderer, x, y);
83 DrawLines(SDL_Renderer * renderer)
90 SDL_RenderGetViewport(renderer, &viewport);
92 for (i = 0; i < num_objects; ++i) {
93 /* Cycle the color and alpha, if desired */
95 current_color += cycle_direction;
96 if (current_color < 0) {
98 cycle_direction = -cycle_direction;
100 if (current_color > 255) {
102 cycle_direction = -cycle_direction;
106 current_alpha += cycle_direction;
107 if (current_alpha < 0) {
109 cycle_direction = -cycle_direction;
111 if (current_alpha > 255) {
113 cycle_direction = -cycle_direction;
116 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
117 (Uint8) current_color, (Uint8) current_alpha);
120 SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
121 SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
122 SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
123 SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
125 x1 = (rand() % (viewport.w*2)) - viewport.w;
126 x2 = (rand() % (viewport.w*2)) - viewport.w;
127 y1 = (rand() % (viewport.h*2)) - viewport.h;
128 y2 = (rand() % (viewport.h*2)) - viewport.h;
129 SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
135 DrawRects(SDL_Renderer * renderer)
141 /* Query the sizes */
142 SDL_RenderGetViewport(renderer, &viewport);
144 for (i = 0; i < num_objects / 4; ++i) {
145 /* Cycle the color and alpha, if desired */
147 current_color += cycle_direction;
148 if (current_color < 0) {
150 cycle_direction = -cycle_direction;
152 if (current_color > 255) {
154 cycle_direction = -cycle_direction;
158 current_alpha += cycle_direction;
159 if (current_alpha < 0) {
161 cycle_direction = -cycle_direction;
163 if (current_alpha > 255) {
165 cycle_direction = -cycle_direction;
168 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
169 (Uint8) current_color, (Uint8) current_alpha);
171 rect.w = rand() % (viewport.h / 2);
172 rect.h = rand() % (viewport.h / 2);
173 rect.x = (rand() % (viewport.w*2) - viewport.w) - (rect.w / 2);
174 rect.y = (rand() % (viewport.h*2) - viewport.h) - (rect.h / 2);
175 SDL_RenderFillRect(renderer, &rect);
185 /* Check for events */
186 while (SDL_PollEvent(&event)) {
187 SDLTest_CommonEvent(state, &event, &done);
189 for (i = 0; i < state->num_windows; ++i) {
190 SDL_Renderer *renderer = state->renderers[i];
191 if (state->windows[i] == NULL)
193 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
194 SDL_RenderClear(renderer);
198 DrawPoints(renderer);
200 SDL_RenderPresent(renderer);
202 #ifdef __EMSCRIPTEN__
204 emscripten_cancel_main_loop();
209 SDL_main(int argc, char *argv[])
212 Uint32 then, now, frames;
214 /* Enable standard application logging */
215 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
217 /* Initialize parameters */
218 num_objects = NUM_OBJECTS;
220 /* Initialize test framework */
221 state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
222 state->window_w = WINDOW_WIDTH;
223 state->window_h = WINDOW_HEIGHT;
227 for (i = 1; i < argc;) {
230 consumed = SDLTest_CommonArg(state, i);
233 if (SDL_strcasecmp(argv[i], "--blend") == 0) {
235 if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
236 blendMode = SDL_BLENDMODE_NONE;
238 } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
239 blendMode = SDL_BLENDMODE_BLEND;
241 } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
242 blendMode = SDL_BLENDMODE_ADD;
244 } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
245 blendMode = SDL_BLENDMODE_MOD;
249 } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
250 cycle_color = SDL_TRUE;
252 } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
253 cycle_alpha = SDL_TRUE;
255 } else if (SDL_isdigit(*argv[i])) {
256 num_objects = SDL_atoi(argv[i]);
261 SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
262 argv[0], SDLTest_CommonUsage(state));
267 if (!SDLTest_CommonInit(state)) {
271 /* Create the windows and initialize the renderers */
272 for (i = 0; i < state->num_windows; ++i) {
273 SDL_Renderer *renderer = state->renderers[i];
274 SDL_SetRenderDrawBlendMode(renderer, blendMode);
275 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
276 SDL_RenderClear(renderer);
279 srand((unsigned int)time(NULL));
281 /* Main render loop */
283 then = SDL_GetTicks();
286 #ifdef __EMSCRIPTEN__
287 emscripten_set_main_loop(loop, 0, 1);
292 //SDL_Delay(10000); /* let it play for awhile. */
298 SDLTest_CommonQuit(state);
300 /* Print out some timing information */
301 now = SDL_GetTicks();
303 double fps = ((double) frames * 1000) / (now - then);
304 SDL_Log("%2.2f frames per second\n", fps);
309 /* vi: set ts=4 sw=4 expandtab: */