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- /*
- Copyright (C) 1997-2019 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: draw as many random objects on the screen as possible */
- #include <stdlib.h>
- #include <stdio.h>
- #include <time.h>
- #ifdef __EMSCRIPTEN__
- #include <emscripten/emscripten.h>
- #endif
- #include "SDL_test_common.h"
- #define NUM_OBJECTS 100
- static SDLTest_CommonState *state;
- static int num_objects;
- static SDL_bool cycle_color;
- static SDL_bool cycle_alpha;
- static int cycle_direction = 1;
- static int current_alpha = 255;
- static int current_color = 255;
- static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
- int done;
- void
- DrawPoints(SDL_Renderer * renderer)
- {
- int i;
- int x, y;
- SDL_Rect viewport;
- /* Query the sizes */
- SDL_RenderGetViewport(renderer, &viewport);
- for (i = 0; i < num_objects * 4; ++i) {
- /* Cycle the color and alpha, if desired */
- if (cycle_color) {
- current_color += cycle_direction;
- if (current_color < 0) {
- current_color = 0;
- cycle_direction = -cycle_direction;
- }
- if (current_color > 255) {
- current_color = 255;
- cycle_direction = -cycle_direction;
- }
- }
- if (cycle_alpha) {
- current_alpha += cycle_direction;
- if (current_alpha < 0) {
- current_alpha = 0;
- cycle_direction = -cycle_direction;
- }
- if (current_alpha > 255) {
- current_alpha = 255;
- cycle_direction = -cycle_direction;
- }
- }
- SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
- (Uint8) current_color, (Uint8) current_alpha);
- x = rand() % viewport.w;
- y = rand() % viewport.h;
- SDL_RenderDrawPoint(renderer, x, y);
- }
- }
- void
- DrawLines(SDL_Renderer * renderer)
- {
- int i;
- int x1, y1, x2, y2;
- SDL_Rect viewport;
- /* Query the sizes */
- SDL_RenderGetViewport(renderer, &viewport);
- for (i = 0; i < num_objects; ++i) {
- /* Cycle the color and alpha, if desired */
- if (cycle_color) {
- current_color += cycle_direction;
- if (current_color < 0) {
- current_color = 0;
- cycle_direction = -cycle_direction;
- }
- if (current_color > 255) {
- current_color = 255;
- cycle_direction = -cycle_direction;
- }
- }
- if (cycle_alpha) {
- current_alpha += cycle_direction;
- if (current_alpha < 0) {
- current_alpha = 0;
- cycle_direction = -cycle_direction;
- }
- if (current_alpha > 255) {
- current_alpha = 255;
- cycle_direction = -cycle_direction;
- }
- }
- SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
- (Uint8) current_color, (Uint8) current_alpha);
- if (i == 0) {
- SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
- SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
- SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
- SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
- } else {
- x1 = (rand() % (viewport.w*2)) - viewport.w;
- x2 = (rand() % (viewport.w*2)) - viewport.w;
- y1 = (rand() % (viewport.h*2)) - viewport.h;
- y2 = (rand() % (viewport.h*2)) - viewport.h;
- SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
- }
- }
- }
- void
- DrawRects(SDL_Renderer * renderer)
- {
- int i;
- SDL_Rect rect;
- SDL_Rect viewport;
- /* Query the sizes */
- SDL_RenderGetViewport(renderer, &viewport);
- for (i = 0; i < num_objects / 4; ++i) {
- /* Cycle the color and alpha, if desired */
- if (cycle_color) {
- current_color += cycle_direction;
- if (current_color < 0) {
- current_color = 0;
- cycle_direction = -cycle_direction;
- }
- if (current_color > 255) {
- current_color = 255;
- cycle_direction = -cycle_direction;
- }
- }
- if (cycle_alpha) {
- current_alpha += cycle_direction;
- if (current_alpha < 0) {
- current_alpha = 0;
- cycle_direction = -cycle_direction;
- }
- if (current_alpha > 255) {
- current_alpha = 255;
- cycle_direction = -cycle_direction;
- }
- }
- SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
- (Uint8) current_color, (Uint8) current_alpha);
- rect.w = rand() % (viewport.h / 2);
- rect.h = rand() % (viewport.h / 2);
- rect.x = (rand() % (viewport.w*2) - viewport.w) - (rect.w / 2);
- rect.y = (rand() % (viewport.h*2) - viewport.h) - (rect.h / 2);
- SDL_RenderFillRect(renderer, &rect);
- }
- }
- void
- loop()
- {
- 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) {
- SDL_Renderer *renderer = state->renderers[i];
- if (state->windows[i] == NULL)
- continue;
- SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
- SDL_RenderClear(renderer);
- DrawRects(renderer);
- DrawLines(renderer);
- DrawPoints(renderer);
- SDL_RenderPresent(renderer);
- }
- #ifdef __EMSCRIPTEN__
- if (done) {
- emscripten_cancel_main_loop();
- }
- #endif
- }
- int
- main(int argc, char *argv[])
- {
- int i;
- Uint32 then, now, frames;
- /* Enable standard application logging */
- SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
- /* Initialize parameters */
- num_objects = NUM_OBJECTS;
- /* Initialize test framework */
- state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
- if (!state) {
- return 1;
- }
- for (i = 1; i < argc;) {
- int consumed;
- consumed = SDLTest_CommonArg(state, i);
- if (consumed == 0) {
- consumed = -1;
- if (SDL_strcasecmp(argv[i], "--blend") == 0) {
- if (argv[i + 1]) {
- if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
- blendMode = SDL_BLENDMODE_NONE;
- consumed = 2;
- } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
- blendMode = SDL_BLENDMODE_BLEND;
- consumed = 2;
- } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
- blendMode = SDL_BLENDMODE_ADD;
- consumed = 2;
- } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
- blendMode = SDL_BLENDMODE_MOD;
- consumed = 2;
- }
- }
- } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
- cycle_color = SDL_TRUE;
- consumed = 1;
- } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
- cycle_alpha = SDL_TRUE;
- consumed = 1;
- } else if (SDL_isdigit(*argv[i])) {
- num_objects = SDL_atoi(argv[i]);
- consumed = 1;
- }
- }
- if (consumed < 0) {
- static const char *options[] = { "[--blend none|blend|add|mod]", "[--cyclecolor]", "[--cyclealpha]", NULL };
- SDLTest_CommonLogUsage(state, argv[0], options);
- return 1;
- }
- i += consumed;
- }
- if (!SDLTest_CommonInit(state)) {
- return 2;
- }
- /* Create the windows and initialize the renderers */
- for (i = 0; i < state->num_windows; ++i) {
- SDL_Renderer *renderer = state->renderers[i];
- SDL_SetRenderDrawBlendMode(renderer, blendMode);
- SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
- SDL_RenderClear(renderer);
- }
- srand((unsigned int)time(NULL));
- /* Main render loop */
- frames = 0;
- then = SDL_GetTicks();
- done = 0;
- #ifdef __EMSCRIPTEN__
- emscripten_set_main_loop(loop, 0, 1);
- #else
- while (!done) {
- ++frames;
- loop();
- }
- #endif
- SDLTest_CommonQuit(state);
- /* 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\n", fps);
- }
- return 0;
- }
- /* vi: set ts=4 sw=4 expandtab: */
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