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 SWAP(typ,a,b) do{typ t=a;a=b;b=t;}while(0)
27 #define NUM_OBJECTS 100
29 static SDLTest_CommonState *state;
30 static int num_objects;
31 static SDL_bool cycle_color;
32 static SDL_bool cycle_alpha;
33 static int cycle_direction = 1;
34 static int current_alpha = 255;
35 static int current_color = 255;
36 static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
38 int mouse_begin_x = -1, mouse_begin_y = -1;
42 DrawPoints(SDL_Renderer * renderer)
49 SDL_RenderGetViewport(renderer, &viewport);
51 for (i = 0; i < num_objects * 4; ++i) {
52 /* Cycle the color and alpha, if desired */
54 current_color += cycle_direction;
55 if (current_color < 0) {
57 cycle_direction = -cycle_direction;
59 if (current_color > 255) {
61 cycle_direction = -cycle_direction;
65 current_alpha += cycle_direction;
66 if (current_alpha < 0) {
68 cycle_direction = -cycle_direction;
70 if (current_alpha > 255) {
72 cycle_direction = -cycle_direction;
75 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
76 (Uint8) current_color, (Uint8) current_alpha);
78 x = rand() % viewport.w;
79 y = rand() % viewport.h;
80 SDL_RenderDrawPoint(renderer, x, y);
86 SDL_Rect lines[MAX_LINES];
88 add_line(int x1, int y1, int x2, int y2)
90 if (num_lines >= MAX_LINES)
92 if ((x1 == x2) && (y1 == y2))
95 SDL_Log("adding line (%d, %d), (%d, %d)\n", x1, y1, x2, y2);
96 lines[num_lines].x = x1;
97 lines[num_lines].y = y1;
98 lines[num_lines].w = x2;
99 lines[num_lines].h = y2;
106 DrawLines(SDL_Renderer * renderer)
111 /* Query the sizes */
112 SDL_RenderGetViewport(renderer, &viewport);
114 SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
116 for (i = 0; i < num_lines; ++i) {
118 SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
119 SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
120 SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
121 SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
123 SDL_RenderDrawLine(renderer, lines[i].x, lines[i].y, lines[i].w, lines[i].h);
130 SDL_Rect rects[MAX_RECTS];
132 add_rect(int x1, int y1, int x2, int y2)
134 if (num_rects >= MAX_RECTS)
136 if ((x1 == x2) || (y1 == y2))
144 SDL_Log("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2,
147 rects[num_rects].x = x1;
148 rects[num_rects].y = y1;
149 rects[num_rects].w = x2 - x1;
150 rects[num_rects].h = y2 - y1;
156 DrawRects(SDL_Renderer * renderer)
158 SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
159 SDL_RenderFillRects(renderer, rects, num_rects);
163 DrawRectLineIntersections(SDL_Renderer * renderer)
167 SDL_SetRenderDrawColor(renderer, 0, 255, 55, 255);
169 for (i = 0; i < num_rects; i++)
170 for (j = 0; j < num_lines; j++) {
180 if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
181 SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
187 DrawRectRectIntersections(SDL_Renderer * renderer)
191 SDL_SetRenderDrawColor(renderer, 255, 200, 0, 255);
193 for (i = 0; i < num_rects; i++)
194 for (j = i + 1; j < num_rects; j++) {
196 if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
197 SDL_RenderFillRect(renderer, &r);
208 /* Check for events */
209 while (SDL_PollEvent(&event)) {
210 SDLTest_CommonEvent(state, &event, &done);
211 switch (event.type) {
212 case SDL_MOUSEBUTTONDOWN:
213 mouse_begin_x = event.button.x;
214 mouse_begin_y = event.button.y;
216 case SDL_MOUSEBUTTONUP:
217 if (event.button.button == 3)
218 add_line(mouse_begin_x, mouse_begin_y, event.button.x,
220 if (event.button.button == 1)
221 add_rect(mouse_begin_x, mouse_begin_y, event.button.x,
225 switch (event.key.keysym.sym) {
227 if (event.key.keysym.mod & KMOD_SHIFT)
230 add_line(rand() % 640, rand() % 480, rand() % 640,
234 if (event.key.keysym.mod & KMOD_SHIFT)
237 add_rect(rand() % 640, rand() % 480, rand() % 640,
246 for (i = 0; i < state->num_windows; ++i) {
247 SDL_Renderer *renderer = state->renderers[i];
248 if (state->windows[i] == NULL)
250 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
251 SDL_RenderClear(renderer);
254 DrawPoints(renderer);
255 DrawRectRectIntersections(renderer);
257 DrawRectLineIntersections(renderer);
259 SDL_RenderPresent(renderer);
261 #ifdef __EMSCRIPTEN__
263 emscripten_cancel_main_loop();
268 main(int argc, char *argv[])
271 Uint32 then, now, frames;
273 /* Enable standard application logging */
274 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
276 /* Initialize parameters */
277 num_objects = NUM_OBJECTS;
279 /* Initialize test framework */
280 state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
281 state->window_w = WINDOW_WIDTH;
282 state->window_h = WINDOW_HEIGHT;
286 for (i = 1; i < argc;) {
289 consumed = SDLTest_CommonArg(state, i);
292 if (SDL_strcasecmp(argv[i], "--blend") == 0) {
294 if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
295 blendMode = SDL_BLENDMODE_NONE;
297 } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
298 blendMode = SDL_BLENDMODE_BLEND;
300 } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
301 blendMode = SDL_BLENDMODE_ADD;
303 } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
304 blendMode = SDL_BLENDMODE_MOD;
308 } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
309 cycle_color = SDL_TRUE;
311 } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
312 cycle_alpha = SDL_TRUE;
314 } else if (SDL_isdigit(*argv[i])) {
315 num_objects = SDL_atoi(argv[i]);
320 SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
321 argv[0], SDLTest_CommonUsage(state));
326 if (!SDLTest_CommonInit(state)) {
330 /* Create the windows and initialize the renderers */
331 for (i = 0; i < state->num_windows; ++i) {
332 SDL_Renderer *renderer = state->renderers[i];
333 SDL_SetRenderDrawBlendMode(renderer, blendMode);
334 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
335 SDL_RenderClear(renderer);
340 /* Main render loop */
342 then = SDL_GetTicks();
345 #ifdef __EMSCRIPTEN__
346 emscripten_set_main_loop(loop, 0, 1);
354 SDLTest_CommonQuit(state);
356 /* Print out some timing information */
357 now = SDL_GetTicks();
359 double fps = ((double) frames * 1000) / (now - then);
360 SDL_Log("%2.2f frames per second\n", fps);
365 /* vi: set ts=4 sw=4 expandtab: */