test/testsprite2.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 03 Feb 2011 00:54:29 -0800
changeset 5158 b3ccd1947786
parent 5147 ad50b3db78bd
child 5184 d976b67150c5
permissions -rw-r--r--
Simplified and improved the process of creating a texture from a surface.
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/* Simple program:  Move N sprites around on the screen as fast 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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#include "common.h"
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#define NUM_SPRITES    100
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#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;
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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 = 0;
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static int current_color = 0;
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static SDL_Rect *positions;
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static SDL_Rect *velocities;
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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. */
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static void
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quit(int rc)
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{
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    if (sprites) {
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        SDL_free(sprites);
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    }
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    if (positions) {
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        SDL_free(positions);
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    }
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    if (velocities) {
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        SDL_free(velocities);
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    }
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    CommonQuit(state);
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    exit(rc);
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}
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int
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LoadSprite(char *file)
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{
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    int i;
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    SDL_Surface *temp;
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    /* Load the sprite image */
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    temp = SDL_LoadBMP(file);
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    if (temp == NULL) {
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        fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
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        return (-1);
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    }
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    sprite_w = temp->w;
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    sprite_h = temp->h;
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    /* Set transparent pixel as the pixel at (0,0) */
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    if (temp->format->palette) {
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        SDL_SetColorKey(temp, 1, *(Uint8 *) temp->pixels);
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    } else {
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        switch (temp->format->BitsPerPixel) {
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        case 15:
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            SDL_SetColorKey(temp, 1, (*(Uint16 *) temp->pixels) & 0x00007FFF);
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            break;
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        case 16:
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            SDL_SetColorKey(temp, 1, *(Uint16 *) temp->pixels);
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            break;
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        case 24:
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            SDL_SetColorKey(temp, 1, (*(Uint32 *) temp->pixels) & 0x00FFFFFF);
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            break;
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        case 32:
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            SDL_SetColorKey(temp, 1, *(Uint32 *) temp->pixels);
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            break;
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        }
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    }
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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]) {
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            fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());
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            SDL_FreeSurface(temp);
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            return (-1);
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        }
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        SDL_SetTextureBlendMode(sprites[i], blendMode);
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    }
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    SDL_FreeSurface(temp);
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    /* We're ready to roll. :) */
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    return (0);
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}
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void
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MoveSprites(SDL_Window * window, SDL_Renderer * renderer, SDL_Texture * sprite)
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{
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    int i, n;
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    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 */
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    SDL_GetWindowSize(window, &window_w, &window_h);
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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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        SDL_SetTextureColorMod(sprite, 255, (Uint8) current_color,
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                               (Uint8) current_color);
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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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        SDL_SetTextureAlphaMod(sprite, (Uint8) current_alpha);
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    }
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    /* Draw a gray background */
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    SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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    SDL_RenderClear(renderer);
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    /* Test points */
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    SDL_SetRenderDrawColor(renderer, 0xFF, 0x00, 0x00, 0xFF);
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    SDL_RenderDrawPoint(renderer, 0, 0);
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    SDL_RenderDrawPoint(renderer, window_w-1, 0);
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    SDL_RenderDrawPoint(renderer, 0, window_h-1);
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    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);
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    SDL_RenderDrawLine(renderer, 1, 0, window_w-2, 0);
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    SDL_RenderDrawLine(renderer, 1, window_h-1, window_w-2, window_h-1);
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    SDL_RenderDrawLine(renderer, 0, 1, 0, window_h-2);
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    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;
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    temp.w = sprite_w;
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    temp.h = sprite_h;
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    SDL_RenderFillRect(renderer, &temp);
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    SDL_RenderCopy(renderer, sprite, NULL, &temp);
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    temp.x = window_w-sprite_w-1;
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    temp.y = 1;
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    temp.w = sprite_w;
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    temp.h = sprite_h;
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    SDL_RenderFillRect(renderer, &temp);
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    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;
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    temp.h = sprite_h;
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    SDL_RenderFillRect(renderer, &temp);
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    SDL_RenderCopy(renderer, sprite, NULL, &temp);
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    temp.x = window_w-sprite_w-1;
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    temp.y = window_h-sprite_h-1;
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    temp.w = sprite_w;
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    temp.h = sprite_h;
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    SDL_RenderFillRect(renderer, &temp);
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    SDL_RenderCopy(renderer, sprite, NULL, &temp);
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    /* Test diagonal lines */
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    SDL_SetRenderDrawColor(renderer, 0x00, 0xFF, 0x00, 0xFF);
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    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 */
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    n = 0;
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    for (i = 0; i < num_sprites; ++i) {
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        position = &positions[i];
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        velocity = &velocities[i];
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        position->x += velocity->x;
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        if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {
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            velocity->x = -velocity->x;
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            position->x += velocity->x;
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        }
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        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;
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            position->y += velocity->y;
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        }
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        /* Blit the sprite onto the screen */
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        SDL_RenderCopy(renderer, sprite, NULL, position);
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    }
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    /* Update the screen! */
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    SDL_RenderPresent(renderer);
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}
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int
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main(int argc, char *argv[])
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{
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    int i, done;
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    SDL_Event event;
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    Uint32 then, now, frames;
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    /* Initialize parameters */
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    num_sprites = NUM_SPRITES;
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    /* Initialize test framework */
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    state = 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 = 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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                    }
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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_sprites = 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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            fprintf(stderr,
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                    "Usage: %s %s [--blend none|blend|add] [--cyclecolor] [--cyclealpha]\n",
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                    argv[0], CommonUsage(state));
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            quit(1);
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        }
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        i += consumed;
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    }
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    if (!CommonInit(state)) {
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        quit(2);
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    }
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    /* Create the windows, initialize the renderers, and load the textures */
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    sprites =
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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");
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        quit(2);
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    }
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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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        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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        SDL_RenderClear(renderer);
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    }
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    if (LoadSprite("icon.bmp") < 0) {
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        quit(2);
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    }
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    /* Allocate memory for the sprite info */
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    positions = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));
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    velocities = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));
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    if (!positions || !velocities) {
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        fprintf(stderr, "Out of memory!\n");
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        quit(2);
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    }
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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);
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        positions[i].y = rand() % (state->window_h - sprite_h);
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        positions[i].w = sprite_w;
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        positions[i].h = sprite_h;
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        velocities[i].x = 0;
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        velocities[i].y = 0;
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        while (!velocities[i].x && !velocities[i].y) {
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            velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
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            velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
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        }
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    }
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    /* Main render loop */
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    frames = 0;
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    then = SDL_GetTicks();
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    done = 0;
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    while (!done) {
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        /* Check for events */
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        ++frames;
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        while (SDL_PollEvent(&event)) {
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            CommonEvent(state, &event, &done);
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        }
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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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        }
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    }
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    /* Print out some timing information */
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    now = SDL_GetTicks();
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    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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    }
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    quit(0);
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    return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */