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testsprite2.c
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/* Simple program: Move N sprites around on the screen as fast as possible */
#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#include "common.h"
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#define NUM_SPRITES 100
#define MAX_SPEED 1
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static CommonState *state;
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static int num_sprites;
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static SDL_Texture **sprites;
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static SDL_bool cycle_color;
static SDL_bool cycle_alpha;
static int cycle_direction = 1;
static int current_alpha = 0;
static int current_color = 0;
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static SDL_Rect *positions;
static SDL_Rect *velocities;
static int sprite_w, sprite_h;
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static SDL_BlendMode blendMode = SDL_BLENDMODE_BLEND;
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
if (sprites) {
SDL_free(sprites);
}
if (positions) {
SDL_free(positions);
}
if (velocities) {
SDL_free(velocities);
}
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CommonQuit(state);
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exit(rc);
}
int
LoadSprite(char *file)
{
int i;
SDL_Surface *temp;
/* Load the sprite image */
temp = SDL_LoadBMP(file);
if (temp == NULL) {
fprintf(stderr, "Couldn't load %s: %s", 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) {
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SDL_SetColorKey(temp, 1, *(Uint8 *) temp->pixels);
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} else {
switch (temp->format->BitsPerPixel) {
case 15:
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SDL_SetColorKey(temp, 1, (*(Uint16 *) temp->pixels) & 0x00007FFF);
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break;
case 16:
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SDL_SetColorKey(temp, 1, *(Uint16 *) temp->pixels);
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break;
case 24:
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SDL_SetColorKey(temp, 1, (*(Uint32 *) temp->pixels) & 0x00FFFFFF);
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break;
case 32:
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SDL_SetColorKey(temp, 1, *(Uint32 *) temp->pixels);
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}
/* Create textures from the image */
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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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sprites[i] = SDL_CreateTextureFromSurface(renderer, temp);
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if (!sprites[i]) {
fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());
SDL_FreeSurface(temp);
return (-1);
}
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SDL_SetTextureBlendMode(sprites[i], blendMode);
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}
SDL_FreeSurface(temp);
/* We're ready to roll. :) */
return (0);
}
void
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MoveSprites(SDL_Window * window, SDL_Renderer * renderer, SDL_Texture * sprite)
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{
int i, n;
int window_w, window_h;
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SDL_Rect temp;
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SDL_Rect *position, *velocity;
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/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
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/* 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;
}
SDL_SetTextureColorMod(sprite, 255, (Uint8) current_color,
(Uint8) current_color);
}
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_SetTextureAlphaMod(sprite, (Uint8) current_alpha);
}
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/* Draw a gray background */
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SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderClear(renderer);
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/* Test points */
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SDL_SetRenderDrawColor(renderer, 0xFF, 0x00, 0x00, 0xFF);
SDL_RenderDrawPoint(renderer, 0, 0);
SDL_RenderDrawPoint(renderer, window_w-1, 0);
SDL_RenderDrawPoint(renderer, 0, window_h-1);
SDL_RenderDrawPoint(renderer, window_w-1, window_h-1);
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/* Test horizontal and vertical lines */
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SDL_SetRenderDrawColor(renderer, 0x00, 0xFF, 0x00, 0xFF);
SDL_RenderDrawLine(renderer, 1, 0, window_w-2, 0);
SDL_RenderDrawLine(renderer, 1, window_h-1, window_w-2, window_h-1);
SDL_RenderDrawLine(renderer, 0, 1, 0, window_h-2);
SDL_RenderDrawLine(renderer, window_w-1, 1, window_w-1, window_h-2);
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/* Test fill and copy */
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SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
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temp.x = 1;
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temp.y = 1;
temp.w = sprite_w;
temp.h = sprite_h;
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SDL_RenderFillRect(renderer, &temp);
SDL_RenderCopy(renderer, sprite, NULL, &temp);
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temp.x = window_w-sprite_w-1;
temp.y = 1;
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temp.w = sprite_w;
temp.h = sprite_h;
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SDL_RenderFillRect(renderer, &temp);
SDL_RenderCopy(renderer, sprite, NULL, &temp);
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temp.x = 1;
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temp.y = window_h-sprite_h-1;
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temp.w = sprite_w;
temp.h = sprite_h;
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SDL_RenderFillRect(renderer, &temp);
SDL_RenderCopy(renderer, sprite, NULL, &temp);
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temp.x = window_w-sprite_w-1;
temp.y = window_h-sprite_h-1;
temp.w = sprite_w;
temp.h = sprite_h;
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SDL_RenderFillRect(renderer, &temp);
SDL_RenderCopy(renderer, sprite, NULL, &temp);
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/* Test diagonal lines */
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SDL_SetRenderDrawColor(renderer, 0x00, 0xFF, 0x00, 0xFF);
SDL_RenderDrawLine(renderer, sprite_w, sprite_h,
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window_w-sprite_w-2, window_h-sprite_h-2);
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SDL_RenderDrawLine(renderer, window_w-sprite_w-2, sprite_h,
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sprite_w, window_h-sprite_h-2);
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/* Move the sprite, bounce at the wall, and draw */
n = 0;
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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;
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if ((position->y < 0) || (position->y >= (window_h - sprite_h))) {
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velocity->y = -velocity->y;
position->y += velocity->y;
}
/* Blit the sprite onto the screen */
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SDL_RenderCopy(renderer, sprite, NULL, position);
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}
/* Update the screen! */
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SDL_RenderPresent(renderer);
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}
int
main(int argc, char *argv[])
{
int i, done;
SDL_Event event;
Uint32 then, now, frames;
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/* Initialize parameters */
num_sprites = NUM_SPRITES;
/* Initialize test framework */
state = CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
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for (i = 1; i < argc;) {
int consumed;
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consumed = CommonArg(state, i);
if (consumed == 0) {
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consumed = -1;
if (SDL_strcasecmp(argv[i], "--blend") == 0) {
if (argv[i + 1]) {
if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
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blendMode = SDL_BLENDMODE_NONE;
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consumed = 2;
} else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
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blendMode = SDL_BLENDMODE_BLEND;
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consumed = 2;
} 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) {
blendMode = SDL_BLENDMODE_MOD;
consumed = 2;
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} 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;
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} else if (SDL_isdigit(*argv[i])) {
num_sprites = SDL_atoi(argv[i]);
consumed = 1;
}
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if (consumed < 0) {
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fprintf(stderr,
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"Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
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argv[0], CommonUsage(state));
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quit(1);
}
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i += consumed;
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if (!CommonInit(state)) {
quit(2);
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}
/* Create the windows, initialize the renderers, and load the textures */
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(SDL_Texture **) SDL_malloc(state->num_windows * sizeof(*sprites));
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if (!sprites) {
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fprintf(stderr, "Out of memory!\n");
quit(2);
}
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for (i = 0; i < state->num_windows; ++i) {
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SDL_Renderer *renderer = state->renderers[i];
SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderClear(renderer);
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}
if (LoadSprite("icon.bmp") < 0) {
quit(2);
}
/* Allocate memory for the sprite info */
positions = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));
velocities = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));
if (!positions || !velocities) {
fprintf(stderr, "Out of memory!\n");
quit(2);
}
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srand((unsigned int)time(NULL));
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for (i = 0; i < num_sprites; ++i) {
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positions[i].x = rand() % (state->window_w - sprite_w);
positions[i].y = rand() % (state->window_h - sprite_h);
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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;
}
}
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/* Main render loop */
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frames = 0;
then = SDL_GetTicks();
done = 0;
while (!done) {
/* Check for events */
++frames;
while (SDL_PollEvent(&event)) {
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CommonEvent(state, &event, &done);
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for (i = 0; i < state->num_windows; ++i) {
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MoveSprites(state->windows[i], state->renderers[i], sprites[i]);
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}
}
/* Print out some timing information */
now = SDL_GetTicks();
if (now > then) {
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double fps = ((double) frames * 1000) / (now - then);
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printf("%2.2f frames per second\n", fps);
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}
quit(0);
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}
/* vi: set ts=4 sw=4 expandtab: */