/* Simple program:  draw as many random objects on the screen as possible */

#include <stdlib.h>

#include <stdio.h>

#include <time.h>

#include "common.h"

#define NUM_OBJECTS	100

static 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;

void

DrawPoints(SDL_WindowID window)

{

    int i;

    int x, y;

    int window_w, window_h;

    /* Query the sizes */

    SDL_GetWindowSize(window, &window_w, &window_h);

    SDL_SetRenderDrawBlendMode(blendMode);

    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(255, (Uint8) current_color,

                               (Uint8) current_color, (Uint8) current_alpha);

        x = rand() % window_w;

        y = rand() % window_h;

        SDL_RenderPoint(x, y);

    }

    SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);

}

void

DrawLines(SDL_WindowID window)

{

    int i;

    int x1, y1, x2, y2;

    int window_w, window_h;

    /* Query the sizes */

    SDL_GetWindowSize(window, &window_w, &window_h);

    SDL_SetRenderDrawBlendMode(blendMode);

    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(255, (Uint8) current_color,

                               (Uint8) current_color, (Uint8) current_alpha);

        if (i == 0) {

            SDL_RenderLine(0, 0, window_w, window_h);

            SDL_RenderLine(0, window_h, window_w, 0);

            SDL_RenderLine(0, window_h / 2, window_w, window_h / 2);

            SDL_RenderLine(window_w / 2, 0, window_w / 2, window_h);

        } else {

            x1 = rand() % window_w;

            x2 = rand() % window_w;

            y1 = rand() % window_h;

            y2 = rand() % window_h;

            SDL_RenderLine(x1, y1, x2, y2);

        }

    }

    SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);

}

void

DrawRects(SDL_WindowID window)

{

    int i;

    SDL_Rect rect;

    int window_w, window_h;

    /* Query the sizes */

    SDL_GetWindowSize(window, &window_w, &window_h);

    SDL_SetRenderDrawBlendMode(blendMode);

    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(255, (Uint8) current_color,

                               (Uint8) current_color, (Uint8) current_alpha);

        rect.w = rand() % (window_h / 2);

        rect.h = rand() % (window_h / 2);

        rect.x = (rand() % window_w) - (rect.w / 2);

        rect.y = (rand() % window_w) - (rect.h / 2);

        SDL_RenderFill(&rect);

    }

    SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);

}

int

main(int argc, char *argv[])

{

    int i, done;

    SDL_Event event;

    Uint32 then, now, frames;

    /* Initialize parameters */

    num_objects = NUM_OBJECTS;

    /* Initialize test framework */

    state = CommonCreateState(argv, SDL_INIT_VIDEO);

    if (!state) {

        return 1;

    }

    for (i = 1; i < argc;) {

        int consumed;

        consumed = 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], "mask") == 0) {

                        blendMode = SDL_BLENDMODE_MASK;

                        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) {

            fprintf(stderr,

                    "Usage: %s %s [--blend none|mask|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",

                    argv[0], CommonUsage(state));

            return 1;

        }

        i += consumed;

    }

    if (!CommonInit(state)) {

        return 2;

    }

    /* Create the windows and initialize the renderers */

    for (i = 0; i < state->num_windows; ++i) {

        SDL_SelectRenderer(state->windows[i]);

        SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);

        SDL_RenderFill(NULL);

    }

    srand(time(NULL));

    /* Main render loop */

    frames = 0;

    then = SDL_GetTicks();

    done = 0;

    while (!done) {

        /* Check for events */

        ++frames;

        while (SDL_PollEvent(&event)) {

            CommonEvent(state, &event, &done);

            switch (event.type) {

            case SDL_WINDOWEVENT:

                switch (event.window.event) {

                case SDL_WINDOWEVENT_EXPOSED:

                    SDL_SelectRenderer(event.window.windowID);

                    SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);

                    SDL_RenderFill(NULL);

                    break;

                }

                break;

            default:

                break;

            }

        }

        for (i = 0; i < state->num_windows; ++i) {

            SDL_SelectRenderer(state->windows[i]);

            SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);

            SDL_RenderFill(NULL);

            DrawRects(state->windows[i]);

            DrawLines(state->windows[i]);

            DrawPoints(state->windows[i]);

            SDL_RenderPresent();

        }

    }

    /* Print out some timing information */

    now = SDL_GetTicks();

    if (now > then) {

        double fps = ((double) frames * 1000) / (now - then);

        printf("%2.2f frames per second\n", fps);

    }

    return 0;

}

/* vi: set ts=4 sw=4 expandtab: */