test/testintersections.c
author Ryan C. Gordon <icculus@icculus.org>
Fri, 12 Aug 2016 19:59:00 -0400
changeset 10266 c09f06c4e8c8
parent 9998 f67cf37e9cd4
permissions -rw-r--r--
emscripten: send fake mouse events for touches, like other targets do. (This really should be handled at the higher level and not in the individual targets, but this fixes the immediate bug.)
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/*
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  Copyright (C) 1997-2016 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 <stdio.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 "SDL_test_common.h"
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#define SWAP(typ,a,b) do{typ t=a;a=b;b=t;}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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int mouse_begin_x = -1, mouse_begin_y = -1;
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int done;
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void
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DrawPoints(SDL_Renderer * renderer)
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{
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    int i;
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    int x, y;
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    SDL_Rect viewport;
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    /* Query the sizes */
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    SDL_RenderGetViewport(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 = rand() % viewport.w;
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        y = rand() % viewport.h;
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        SDL_RenderDrawPoint(renderer, x, y);
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    }
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}
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#define MAX_LINES 16
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int num_lines = 0;
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SDL_Rect lines[MAX_LINES];
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static int
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add_line(int x1, int y1, int x2, int y2)
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{
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    if (num_lines >= MAX_LINES)
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        return 0;
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    if ((x1 == x2) && (y1 == y2))
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        return 0;
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    SDL_Log("adding line (%d, %d), (%d, %d)\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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void
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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_RenderGetViewport(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_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
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            SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
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            SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
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            SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
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        } else {
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            SDL_RenderDrawLine(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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int num_rects = 0;
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SDL_Rect rects[MAX_RECTS];
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static int
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add_rect(int x1, int y1, int x2, int y2)
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{
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    if (num_rects >= MAX_RECTS)
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        return 0;
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    if ((x1 == x2) || (y1 == y2))
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        return 0;
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    if (x1 > x2)
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        SWAP(int, x1, x2);
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    if (y1 > y2)
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        SWAP(int, y1, y2);
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7639
9406b7dd2f2d Fix bug 2034: replace printf by SDL_Log in tests; update loopwave VS solution: copy missing dependency
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    SDL_Log("adding rect (%d, %d), (%d, %d) [%dx%d]\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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   150
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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);
2994
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}
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   160
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static void
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DrawRectLineIntersections(SDL_Renderer * renderer)
2994
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{
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    int i, j;
2994
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    SDL_SetRenderDrawColor(renderer, 0, 255, 55, 255);
2994
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   167
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    for (i = 0; i < num_rects; i++)
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   169
        for (j = 0; j < num_lines; j++) {
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   170
            int x1, y1, x2, y2;
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            SDL_Rect r;
2994
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            r = rects[i];
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   174
            x1 = lines[j].x;
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   175
            y1 = lines[j].y;
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   176
            x2 = lines[j].w;
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   177
            y2 = lines[j].h;
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   178
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   179
            if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
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                SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
2997
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   181
            }
2994
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   182
        }
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}
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static void
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   186
DrawRectRectIntersections(SDL_Renderer * renderer)
2994
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{
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   188
    int i, j;
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diff changeset
   189
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   190
    SDL_SetRenderDrawColor(renderer, 255, 200, 0, 255);
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diff changeset
   191
2994
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   192
    for (i = 0; i < num_rects; i++)
2997
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diff changeset
   193
        for (j = i + 1; j < num_rects; j++) {
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diff changeset
   194
            SDL_Rect r;
Sam Lantinga <slouken@libsdl.org>
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   195
            if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
5147
ad50b3db78bd The rendering functions take a context so it's clear what window they're drawing to. This also potentially opens to the door to multi-threaded rendering in the future.
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   196
                SDL_RenderFillRect(renderer, &r);
2997
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diff changeset
   197
            }
2994
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diff changeset
   198
        }
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diff changeset
   199
}
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   200
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void
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   202
loop()
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{
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    int i;
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    SDL_Event event;
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   206
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   207
    /* Check for events */
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   208
    while (SDL_PollEvent(&event)) {
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        SDLTest_CommonEvent(state, &event, &done);
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        switch (event.type) {
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   211
        case SDL_MOUSEBUTTONDOWN:
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   212
            mouse_begin_x = event.button.x;
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   213
            mouse_begin_y = event.button.y;
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   214
            break;
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   215
        case SDL_MOUSEBUTTONUP:
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   216
            if (event.button.button == 3)
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   217
                add_line(mouse_begin_x, mouse_begin_y, event.button.x,
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   218
                         event.button.y);
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   219
            if (event.button.button == 1)
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   220
                add_rect(mouse_begin_x, mouse_begin_y, event.button.x,
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   221
                         event.button.y);
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   222
            break;
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   223
        case SDL_KEYDOWN:
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   224
            switch (event.key.keysym.sym) {
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   225
            case 'l':
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   226
                if (event.key.keysym.mod & KMOD_SHIFT)
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   227
                    num_lines = 0;
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   228
                else
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   229
                    add_line(rand() % 640, rand() % 480, rand() % 640,
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   230
                             rand() % 480);
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   231
                break;
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   232
            case 'r':
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   233
                if (event.key.keysym.mod & KMOD_SHIFT)
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   234
                    num_rects = 0;
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   235
                else
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   236
                    add_rect(rand() % 640, rand() % 480, rand() % 640,
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   237
                             rand() % 480);
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   238
                break;
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   239
            }
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   240
            break;
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   241
        default:
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   242
            break;
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diff changeset
   243
        }
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   244
    }
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   245
    for (i = 0; i < state->num_windows; ++i) {
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   246
        SDL_Renderer *renderer = state->renderers[i];
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   247
        if (state->windows[i] == NULL)
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   248
            continue;
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   249
        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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        SDL_RenderClear(renderer);
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   251
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   252
        DrawRects(renderer);
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   253
        DrawPoints(renderer);
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   254
        DrawRectRectIntersections(renderer);
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   255
        DrawLines(renderer);
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   256
        DrawRectLineIntersections(renderer);
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   257
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   258
        SDL_RenderPresent(renderer);
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   259
    }
9607
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   260
#ifdef __EMSCRIPTEN__
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   261
    if (done) {
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   262
        emscripten_cancel_main_loop();
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diff changeset
   263
    }
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   264
#endif
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   265
}
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int
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main(int argc, char *argv[])
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{
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    int i;
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    Uint32 then, now, frames;
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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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    /* Initialize parameters */
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    num_objects = NUM_OBJECTS;
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    /* Initialize test framework */
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    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
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    if (!state) {
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        return 1;
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    }
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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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                    }
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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 (SDL_isdigit(*argv[i])) {
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                num_objects = SDL_atoi(argv[i]);
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                consumed = 1;
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            }
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        }
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        if (consumed < 0) {
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            SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
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                    argv[0], SDLTest_CommonUsage(state));
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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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   326
    }
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   327
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   328
    /* Create the windows and initialize the renderers */
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   329
    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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   332
        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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   333
        SDL_RenderClear(renderer);
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   334
    }
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   335
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   336
    srand(time(NULL));
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   337
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   338
    /* Main render loop */
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   339
    frames = 0;
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   340
    then = SDL_GetTicks();
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   341
    done = 0;
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   342
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   343
#ifdef __EMSCRIPTEN__
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    emscripten_set_main_loop(loop, 0, 1);
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   345
#else
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   346
    while (!done) {
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   347
        ++frames;
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   348
        loop();
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   349
    }
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   350
#endif
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   352
    SDLTest_CommonQuit(state);
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   353
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   354
    /* Print out some timing information */
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   355
    now = SDL_GetTicks();
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   356
    if (now > then) {
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   357
        double fps = ((double) frames * 1000) / (now - then);
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   358
        SDL_Log("%2.2f frames per second\n", fps);
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   359
    }
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   360
    return 0;
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   361
}
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   362
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   363
/* vi: set ts=4 sw=4 expandtab: */