#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "SDL.h"

Include dependency graph for testspriteminimal.c:

Macros
#define	WINDOW_WIDTH 640
#define	WINDOW_HEIGHT 480
#define	NUM_SPRITES 100
#define	MAX_SPEED 1

Functions
static void	quit (int rc)
int	LoadSprite (char file, SDL_Renderer renderer)
void	MoveSprites (SDL_Renderer renderer, SDL_Texture sprite)
void	loop ()
int	main (int argc, char *argv[])

Variables
static SDL_Texture *	sprite
static SDL_Rect	positions [NUM_SPRITES]
static SDL_Rect	velocities [NUM_SPRITES]
static int	sprite_w
static int	sprite_h
SDL_Renderer *	renderer
int	done

Macro Definition Documentation

#define MAX_SPEED 1

Definition at line 27 of file testspriteminimal.c.

Referenced by main().

#define NUM_SPRITES 100

Definition at line 26 of file testspriteminimal.c.

Referenced by main(), and MoveSprites().

#define WINDOW_HEIGHT 480

Definition at line 25 of file testspriteminimal.c.

Referenced by main(), and MoveSprites().

#define WINDOW_WIDTH 640

Definition at line 24 of file testspriteminimal.c.

Referenced by main(), and MoveSprites().

Function Documentation

int LoadSprite	(	char *	file,
		SDL_Renderer *	renderer
	)

Definition at line 45 of file testspriteminimal.c.

References SDL_PixelFormat::BitsPerPixel, SDL_Surface::format, SDL_Surface::h, NULL, SDL_PixelFormat::palette, SDL_Surface::pixels, SDL_CreateTextureFromSurface, SDL_FreeSurface, SDL_GetError, SDL_LoadBMP, SDL_LOG_CATEGORY_APPLICATION, SDL_LogError, SDL_SetColorKey, SDL_TRUE, sprite_h, sprite_w, and SDL_Surface::w.

{
    SDL_Surface *temp;
    /* Load the sprite image */
    temp = SDL_LoadBMP(file);
    if (temp == NULL) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", file, SDL_GetError());
        return (-1);
    }
    sprite_w = temp->w;
    sprite_h = temp->h;
    /* Set transparent pixel as the pixel at (0,0) */
    if (temp->format->palette) {
        SDL_SetColorKey(temp, SDL_TRUE, *(Uint8 *) temp->pixels);
    } else {
        switch (temp->format->BitsPerPixel) {
        case 15:
            SDL_SetColorKey(temp, SDL_TRUE,
                            (*(Uint16 *) temp->pixels) & 0x00007FFF);
            break;
        case 16:
            SDL_SetColorKey(temp, SDL_TRUE, *(Uint16 *) temp->pixels);
            break;
        case 24:
            SDL_SetColorKey(temp, SDL_TRUE,
                            (*(Uint32 *) temp->pixels) & 0x00FFFFFF);
            break;
        case 32:
            SDL_SetColorKey(temp, SDL_TRUE, *(Uint32 *) temp->pixels);
            break;
        }
    }
    /* Create textures from the image */
    sprite = SDL_CreateTextureFromSurface(renderer, temp);
    if (!sprite) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
        SDL_FreeSurface(temp);
        return (-1);
    }
    SDL_FreeSurface(temp);
    /* We're ready to roll. :) */
    return (0);
}

void loop ( )

Definition at line 128 of file testspriteminimal.c.

References done, MoveSprites(), SDL_KEYDOWN, SDL_PollEvent, SDL_QUIT, and SDL_Event::type.

{
    SDL_Event event;
    /* Check for events */
    while (SDL_PollEvent(&event)) {
        if (event.type == SDL_QUIT || event.type == SDL_KEYDOWN) {
            done = 1;
        }
    }
    MoveSprites(renderer, sprite);
#ifdef __EMSCRIPTEN__
    if (done) {
        emscripten_cancel_main_loop();
    }
#endif
}

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 147 of file testspriteminimal.c.

References done, SDL_Rect::h, i, LoadSprite(), loop(), MAX_SPEED, NULL, NUM_SPRITES, quit(), SDL_CreateWindowAndRenderer, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogSetPriority, sprite_h, sprite_w, SDL_Rect::w, WINDOW_HEIGHT, WINDOW_WIDTH, SDL_Rect::x, and SDL_Rect::y.

{
    SDL_Window *window;
    int i;
    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    if (SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_HEIGHT, 0, &window, &renderer) < 0) {
        quit(2);
    }
    if (LoadSprite("icon.bmp", renderer) < 0) {
        quit(2);
    }
    /* Initialize the sprite positions */
    srand(time(NULL));
    for (i = 0; i < NUM_SPRITES; ++i) {
        positions[i].x = rand() % (WINDOW_WIDTH - sprite_w);
        positions[i].y = rand() % (WINDOW_HEIGHT - sprite_h);
        positions[i].w = sprite_w;
        positions[i].h = sprite_h;
        velocities[i].x = 0;
        velocities[i].y = 0;
        while (!velocities[i].x && !velocities[i].y) {
            velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
            velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
        }
    }
    /* Main render loop */
    done = 0;
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (!done) {
        loop();
    }
#endif
    quit(0);
    return 0; /* to prevent compiler warning */
}

void MoveSprites	(	SDL_Renderer *	renderer,
		SDL_Texture *	sprite
	)

Definition at line 94 of file testspriteminimal.c.

References i, NULL, NUM_SPRITES, SDL_RenderClear, SDL_RenderCopy, SDL_RenderPresent, SDL_SetRenderDrawColor, sprite_h, sprite_w, window_h, WINDOW_HEIGHT, window_w, WINDOW_WIDTH, SDL_Rect::x, and SDL_Rect::y.

{
    int i;
    int window_w = WINDOW_WIDTH;
    int window_h = WINDOW_HEIGHT;
    SDL_Rect *position, *velocity;
    /* Draw a gray background */
    SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
    SDL_RenderClear(renderer);
    /* Move the sprite, bounce at the wall, and draw */
    for (i = 0; i < NUM_SPRITES; ++i) {
        position = &positions[i];
        velocity = &velocities[i];
        position->x += velocity->x;
        if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {
            velocity->x = -velocity->x;
            position->x += velocity->x;
        }
        position->y += velocity->y;
        if ((position->y < 0) || (position->y >= (window_h - sprite_h))) {
            velocity->y = -velocity->y;
            position->y += velocity->y;
        }
        /* Blit the sprite onto the screen */
        SDL_RenderCopy(renderer, sprite, NULL, position);
    }
    /* Update the screen! */
    SDL_RenderPresent(renderer);
}