391 lines
11 KiB
C
391 lines
11 KiB
C
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/*
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* Simple program: draw as many random objects on the screen as possible */
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#include <stdlib.h>
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#include <time.h>
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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#include <SDL3/SDL_test_common.h>
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#include <SDL3/SDL_main.h>
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#define SWAP(typ, a, b) \
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do { \
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typ t = a; \
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a = b; \
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b = t; \
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} while (0)
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#define NUM_OBJECTS 100
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static SDLTest_CommonState *state;
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static int num_objects;
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static SDL_bool cycle_color;
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static SDL_bool cycle_alpha;
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static int cycle_direction = 1;
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static int current_alpha = 255;
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static int current_color = 255;
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static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
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static float mouse_begin_x = -1.0f, mouse_begin_y = -1.0f;
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static void DrawPoints(SDL_Renderer *renderer)
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{
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int i;
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float x, y;
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SDL_Rect viewport;
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/* Query the sizes */
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SDL_GetRenderViewport(renderer, &viewport);
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for (i = 0; i < num_objects * 4; ++i) {
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/* Cycle the color and alpha, if desired */
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if (cycle_color) {
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current_color += cycle_direction;
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if (current_color < 0) {
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current_color = 0;
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cycle_direction = -cycle_direction;
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}
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if (current_color > 255) {
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current_color = 255;
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cycle_direction = -cycle_direction;
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}
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}
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if (cycle_alpha) {
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current_alpha += cycle_direction;
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if (current_alpha < 0) {
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current_alpha = 0;
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cycle_direction = -cycle_direction;
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}
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if (current_alpha > 255) {
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current_alpha = 255;
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cycle_direction = -cycle_direction;
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}
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}
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SDL_SetRenderDrawColor(renderer, 255, (Uint8)current_color,
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(Uint8)current_color, (Uint8)current_alpha);
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x = (float)(rand() % viewport.w);
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y = (float)(rand() % viewport.h);
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SDL_RenderPoint(renderer, x, y);
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}
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}
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#define MAX_LINES 16
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static int num_lines = 0;
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static SDL_FRect lines[MAX_LINES];
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static int add_line(float x1, float y1, float x2, float y2)
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{
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if (num_lines >= MAX_LINES) {
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return 0;
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}
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if ((x1 == x2) && (y1 == y2)) {
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return 0;
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}
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SDL_Log("adding line (%g, %g), (%g, %g)\n", x1, y1, x2, y2);
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lines[num_lines].x = x1;
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lines[num_lines].y = y1;
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lines[num_lines].w = x2;
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lines[num_lines].h = y2;
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return ++num_lines;
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}
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static void DrawLines(SDL_Renderer *renderer)
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{
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int i;
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SDL_Rect viewport;
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/* Query the sizes */
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SDL_GetRenderViewport(renderer, &viewport);
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
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for (i = 0; i < num_lines; ++i) {
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if (i == -1) {
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SDL_RenderLine(renderer, 0.0f, 0.0f, (float)(viewport.w - 1), (float)(viewport.h - 1));
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SDL_RenderLine(renderer, 0.0f, (float)(viewport.h - 1), (float)(viewport.w - 1), 0.0f);
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SDL_RenderLine(renderer, 0.0f, (float)(viewport.h / 2), (float)(viewport.w - 1), (float)(viewport.h / 2));
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SDL_RenderLine(renderer, (float)(viewport.w / 2), 0.0f, (float)(viewport.w / 2), (float)(viewport.h - 1));
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} else {
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SDL_RenderLine(renderer, lines[i].x, lines[i].y, lines[i].w, lines[i].h);
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}
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}
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}
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#define MAX_RECTS 16
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static int num_rects = 0;
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static SDL_FRect rects[MAX_RECTS];
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static int add_rect(float x1, float y1, float x2, float y2)
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{
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if (num_rects >= MAX_RECTS) {
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return 0;
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}
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if ((x1 == x2) || (y1 == y2)) {
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return 0;
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}
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if (x1 > x2) {
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SWAP(float, x1, x2);
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}
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if (y1 > y2) {
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SWAP(float, y1, y2);
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}
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SDL_Log("adding rect (%g, %g), (%g, %g) [%gx%g]\n", x1, y1, x2, y2,
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x2 - x1, y2 - y1);
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rects[num_rects].x = x1;
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rects[num_rects].y = y1;
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rects[num_rects].w = x2 - x1;
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rects[num_rects].h = y2 - y1;
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return ++num_rects;
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}
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static void
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DrawRects(SDL_Renderer *renderer)
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{
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SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
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SDL_RenderFillRects(renderer, rects, num_rects);
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}
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static void
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DrawRectLineIntersections(SDL_Renderer *renderer)
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{
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int i, j;
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SDL_SetRenderDrawColor(renderer, 0, 255, 55, 255);
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for (i = 0; i < num_rects; i++) {
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for (j = 0; j < num_lines; j++) {
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float x1, y1, x2, y2;
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SDL_FRect r;
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r = rects[i];
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x1 = lines[j].x;
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y1 = lines[j].y;
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x2 = lines[j].w;
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y2 = lines[j].h;
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if (SDL_GetRectAndLineIntersectionFloat(&r, &x1, &y1, &x2, &y2)) {
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SDL_RenderLine(renderer, x1, y1, x2, y2);
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}
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}
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}
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}
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static void
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DrawRectRectIntersections(SDL_Renderer *renderer)
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{
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int i, j;
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SDL_SetRenderDrawColor(renderer, 255, 200, 0, 255);
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for (i = 0; i < num_rects; i++) {
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for (j = i + 1; j < num_rects; j++) {
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SDL_FRect r;
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if (SDL_GetRectIntersectionFloat(&rects[i], &rects[j], &r)) {
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SDL_RenderFillRect(renderer, &r);
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}
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}
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}
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}
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static void loop(void *arg)
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{
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int i;
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SDL_Event event;
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int *done = (int*)arg;
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/* Check for events */
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while (SDL_PollEvent(&event)) {
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SDLTest_CommonEvent(state, &event, done);
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switch (event.type) {
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case SDL_EVENT_MOUSE_BUTTON_DOWN:
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mouse_begin_x = event.button.x;
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mouse_begin_y = event.button.y;
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break;
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case SDL_EVENT_MOUSE_BUTTON_UP:
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if (event.button.button == 3) {
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add_line(mouse_begin_x, mouse_begin_y, event.button.x, event.button.y);
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}
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if (event.button.button == 1) {
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add_rect(mouse_begin_x, mouse_begin_y, event.button.x, event.button.y);
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}
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break;
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case SDL_EVENT_KEY_DOWN:
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switch (event.key.keysym.sym) {
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case 'l':
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if (event.key.keysym.mod & SDL_KMOD_SHIFT) {
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num_lines = 0;
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} else {
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add_line(
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(float)(rand() % 640),
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(float)(rand() % 480),
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(float)(rand() % 640),
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(float)(rand() % 480));
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}
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break;
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case 'r':
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if (event.key.keysym.mod & SDL_KMOD_SHIFT) {
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num_rects = 0;
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} else {
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add_rect(
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(float)(rand() % 640),
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(float)(rand() % 480),
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(float)(rand() % 640),
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(float)(rand() % 480));
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}
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break;
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}
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break;
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default:
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break;
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}
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}
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for (i = 0; i < state->num_windows; ++i) {
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SDL_Renderer *renderer = state->renderers[i];
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if (state->windows[i] == NULL) {
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continue;
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}
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SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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SDL_RenderClear(renderer);
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DrawRects(renderer);
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DrawPoints(renderer);
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DrawRectRectIntersections(renderer);
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DrawLines(renderer);
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DrawRectLineIntersections(renderer);
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SDL_RenderPresent(renderer);
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}
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#ifdef __EMSCRIPTEN__
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if (*done) {
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emscripten_cancel_main_loop();
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}
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#endif
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}
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int main(int argc, char *argv[])
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{
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int i;
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Uint64 then, now;
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Uint32 frames;
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int done;
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/* Initialize parameters */
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num_objects = -1; /* -1 means not initialized */
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/* Initialize test framework */
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state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
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if (state == NULL) {
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return 1;
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}
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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for (i = 1; i < argc;) {
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int consumed;
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consumed = SDLTest_CommonArg(state, i);
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if (consumed == 0) {
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consumed = -1;
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if (SDL_strcasecmp(argv[i], "--blend") == 0) {
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if (argv[i + 1]) {
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if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
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blendMode = SDL_BLENDMODE_NONE;
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consumed = 2;
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} else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
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blendMode = SDL_BLENDMODE_BLEND;
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consumed = 2;
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} else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
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blendMode = SDL_BLENDMODE_ADD;
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consumed = 2;
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} else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
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blendMode = SDL_BLENDMODE_MOD;
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consumed = 2;
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} else if (SDL_strcasecmp(argv[i + 1], "mul") == 0) {
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blendMode = SDL_BLENDMODE_MUL;
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consumed = 2;
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}
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}
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} else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
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cycle_color = SDL_TRUE;
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consumed = 1;
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} else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
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cycle_alpha = SDL_TRUE;
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consumed = 1;
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} else if (num_objects < 0 && SDL_isdigit(*argv[i])) {
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char *endptr = NULL;
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num_objects = (int)SDL_strtol(argv[i], &endptr, 0);
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if (endptr != argv[i] && *endptr == '\0' && num_objects >= 0) {
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consumed = 1;
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}
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}
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}
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if (consumed < 0) {
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static const char *options[] = { "[--blend none|blend|add|mod|mul]", "[--cyclecolor]", "[--cyclealpha]", "[count]", NULL };
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SDLTest_CommonLogUsage(state, argv[0], options);
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return 1;
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}
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i += consumed;
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}
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if (!SDLTest_CommonInit(state)) {
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return 2;
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}
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if (num_objects < 0) {
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num_objects = NUM_OBJECTS;
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}
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/* Create the windows and initialize the renderers */
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for (i = 0; i < state->num_windows; ++i) {
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SDL_Renderer *renderer = state->renderers[i];
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SDL_SetRenderDrawBlendMode(renderer, blendMode);
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SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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SDL_RenderClear(renderer);
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}
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srand((unsigned int)time(NULL));
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/* Main render loop */
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frames = 0;
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then = SDL_GetTicks();
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done = 0;
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop_arg(loop, &done, 0, 1);
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#else
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while (!done) {
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++frames;
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loop(&done);
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}
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|
#endif
|
||
|
|
|
||
|
|
/* Print out some timing information */
|
||
|
|
now = SDL_GetTicks();
|
||
|
|
|
||
|
|
SDLTest_CommonQuit(state);
|
||
|
|
|
||
|
|
if (now > then) {
|
||
|
|
double fps = ((double)frames * 1000) / (now - then);
|
||
|
|
SDL_Log("%2.2f frames per second\n", fps);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|