testspriteminimal.c
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/*
Copyright (C) 1997-2016 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: Move N sprites around on the screen as fast as possible */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#include "SDL.h"
#define WINDOW_WIDTH 640
#define WINDOW_HEIGHT 480
#define NUM_SPRITES 100
#define MAX_SPEED 1
static SDL_Texture *sprite;
static SDL_Rect positions[NUM_SPRITES];
static SDL_Rect velocities[NUM_SPRITES];
static int sprite_w, sprite_h;
SDL_Renderer *renderer;
int done;
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
exit(rc);
}
int
LoadSprite(char *file, SDL_Renderer *renderer)
{
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
MoveSprites(SDL_Renderer * renderer, SDL_Texture * sprite)
{
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);
}
void loop()
{
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[])
{
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 */
}
/* vi: set ts=4 sw=4 expandtab: */
NUM_SPRITES
#define NUM_SPRITES
Definition: testspriteminimal.c:26
SDL_PollEvent
#define SDL_PollEvent
Definition: SDL_dynapi_overrides.h:128
SDL_KEYDOWN
Definition: SDL_events.h:93
SDL_GetError
#define SDL_GetError
Definition: SDL_dynapi_overrides.h:119
Uint32
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:155
LoadSprite
int LoadSprite(char *file, SDL_Renderer *renderer)
Definition: testspriteminimal.c:45
SDL_Surface::h
int h
Definition: SDL_surface.h:73
SDL_LoadBMP
#define SDL_LoadBMP(file)
Definition: SDL_surface.h:182
x
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1567
window
SDL_Window * window
Definition: testautomation_render.c:26
loop
void loop()
Definition: testspriteminimal.c:128
velocities
static SDL_Rect velocities[NUM_SPRITES]
Definition: testspriteminimal.c:31
SDL_Surface
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
SDL_QUIT
Definition: SDL_events.h:60
MoveSprites
void MoveSprites(SDL_Renderer *renderer, SDL_Texture *sprite)
Definition: testspriteminimal.c:94
SDL_Renderer
Definition: SDL_sysrender.h:76
sprite_w
static int sprite_w
Definition: testspriteminimal.c:32
SDL_Surface::w
int w
Definition: SDL_surface.h:73
MAX_SPEED
#define MAX_SPEED
Definition: testspriteminimal.c:27
renderer
SDL_Renderer * renderer
Definition: testspriteminimal.c:34
sprite_h
static int sprite_h
Definition: testspriteminimal.c:32
SDL_Texture
Definition: SDL_sysrender.h:49
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:42
SDL_RenderCopy
#define SDL_RenderCopy
Definition: SDL_dynapi_overrides.h:349
positions
static SDL_Rect positions[NUM_SPRITES]
Definition: testspriteminimal.c:30
SDL_CreateTextureFromSurface
#define SDL_CreateTextureFromSurface
Definition: SDL_dynapi_overrides.h:313
y
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1567
SDL_Surface::pixels
void * pixels
Definition: SDL_surface.h:75
SDL_FreeSurface
#define SDL_FreeSurface
Definition: SDL_dynapi_overrides.h:450
Uint8
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:139
event
struct _cl_event * event
Definition: SDL_opengl_glext.h:2649
SDL_PixelFormat::BitsPerPixel
Uint8 BitsPerPixel
Definition: SDL_pixels.h:303
SDL_SetColorKey
#define SDL_SetColorKey
Definition: SDL_dynapi_overrides.h:457
SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
SDL_Rect::x
int x
Definition: SDL_rect.h:66
WINDOW_WIDTH
#define WINDOW_WIDTH
Definition: testspriteminimal.c:24
main
int main(int argc, char *argv[])
Definition: testspriteminimal.c:147
SDL_TRUE
Definition: SDL_stdinc.h:129
SDL_Rect::w
int w
Definition: SDL_rect.h:67
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:42
SDL_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:242
NULL
#define NULL
Definition: begin_code.h:143
SDL_Surface::format
SDL_PixelFormat * format
Definition: SDL_surface.h:72
SDL_RenderClear
#define SDL_RenderClear
Definition: SDL_dynapi_overrides.h:340
SDL_Rect::h
int h
Definition: SDL_rect.h:67
sprite
static SDL_Texture * sprite
Definition: testspriteminimal.c:29
WINDOW_HEIGHT
#define WINDOW_HEIGHT
Definition: testspriteminimal.c:25
SDL_Window
The type used to identify a window.
Definition: SDL_sysvideo.h:71
SDL_CreateWindowAndRenderer
#define SDL_CreateWindowAndRenderer
Definition: SDL_dynapi_overrides.h:306
done
int done
Definition: testspriteminimal.c:35
window_h
int window_h
Definition: testoverlay2.c:146
Uint16
uint16_t Uint16
An unsigned 16-bit integer type.
Definition: SDL_stdinc.h:147
SDL_Event
General event structure.
Definition: SDL_events.h:521
SDL_SetRenderDrawColor
#define SDL_SetRenderDrawColor
Definition: SDL_dynapi_overrides.h:336
SDL_PixelFormat::palette
SDL_Palette * palette
Definition: SDL_pixels.h:302
SDL.h
SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
SDL_Rect::y
int y
Definition: SDL_rect.h:66
window_w
int window_w
Definition: testoverlay2.c:145
SDL_Rect
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64
SDL_RenderPresent
#define SDL_RenderPresent
Definition: SDL_dynapi_overrides.h:352
SDL_Event::type
Uint32 type
Definition: SDL_events.h:523
quit
static void quit(int rc)
Definition: testspriteminimal.c:39