test/testsprite2.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 14 Aug 2017 05:51:44 -0700
changeset 11282 180e8906dc3c
parent 10737 3406a0f8b041
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Implemented more flexible blending modes for accelerated renderers

This fixes bug 2594 - Propose new blend mode, SDL_BLENDMODE_BLEND_DSTA

blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_SRC_ALPHA,
SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
SDL_BLENDOPERATION_ADD,
SDL_BLENDFACTOR_ZERO,
SDL_BLENDFACTOR_ONE,
SDL_BLENDOPERATION_ADD);

This fixes bug 2828 - Subtractive Blending

blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_SRC_ALPHA,
SDL_BLENDFACTOR_ONE,
SDL_BLENDOPERATION_SUBTRACT,
SDL_BLENDFACTOR_ZERO,
SDL_BLENDFACTOR_ONE,
SDL_BLENDOPERATION_SUBTRACT);


This goes partway to fixing bug 3684 - Add support for a pre-multiplied alpha blending mode

blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_ONE,
SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
SDL_BLENDOPERATION_ADD,
SDL_BLENDFACTOR_ONE,
SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
SDL_BLENDOPERATION_ADD);
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/*
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  Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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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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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#include "SDL_test.h"
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#include "SDL_test_common.h"
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#define NUM_SPRITES    100
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#define MAX_SPEED     1
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static SDLTest_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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/* Number of iterations to move sprites - used for visual tests. */
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/* -1: infinite random moves (default); >=0: enables N deterministic moves */
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static int iterations = -1;
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int done;
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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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    SDL_free(sprites);
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    SDL_free(positions);
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    SDL_free(velocities);
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    SDLTest_CommonQuit(state);
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    exit(rc);
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}
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int
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LoadSprite(const 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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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "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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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "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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        if (SDL_SetTextureBlendMode(sprites[i], blendMode) < 0) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set blend mode: %s\n", SDL_GetError());
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            SDL_FreeSurface(temp);
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            SDL_DestroyTexture(sprites[i]);
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            return (-1);
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        }
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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_Renderer * renderer, SDL_Texture * sprite)
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{
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    int i;
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    SDL_Rect viewport, temp;
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    SDL_Rect *position, *velocity;
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    /* Query the sizes */
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    SDL_RenderGetViewport(renderer, &viewport);
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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, viewport.w-1, 0);
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    SDL_RenderDrawPoint(renderer, 0, viewport.h-1);
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    SDL_RenderDrawPoint(renderer, viewport.w-1, viewport.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, viewport.w-2, 0);
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    SDL_RenderDrawLine(renderer, 1, viewport.h-1, viewport.w-2, viewport.h-1);
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    SDL_RenderDrawLine(renderer, 0, 1, 0, viewport.h-2);
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    SDL_RenderDrawLine(renderer, viewport.w-1, 1, viewport.w-1, viewport.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 = viewport.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 = viewport.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 = viewport.w-sprite_w-1;
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    temp.y = viewport.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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                       viewport.w-sprite_w-2, viewport.h-sprite_h-2);
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    SDL_RenderDrawLine(renderer, viewport.w-sprite_w-2, sprite_h,
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                       sprite_w, viewport.h-sprite_h-2);
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    /* Conditionally move the sprites, bounce at the wall */
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    if (iterations == -1 || iterations > 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 >= (viewport.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 >= (viewport.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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        }
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        /* Countdown sprite-move iterations and disable color changes at iteration end - used for visual tests. */
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        if (iterations > 0) {
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            iterations--;
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            if (iterations == 0) {
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                cycle_alpha = SDL_FALSE;
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                cycle_color = SDL_FALSE;
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            }
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        }
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    }
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    /* Draw sprites */
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    for (i = 0; i < num_sprites; ++i) {
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        position = &positions[i];
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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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void
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loop()
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{
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    int i;
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    SDL_Event event;
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    /* Check for events */
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    while (SDL_PollEvent(&event)) {
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        SDLTest_CommonEvent(state, &event, &done);
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    }
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    for (i = 0; i < state->num_windows; ++i) {
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        if (state->windows[i] == NULL)
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            continue;
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        MoveSprites(state->renderers[i], sprites[i]);
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    }
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#ifdef __EMSCRIPTEN__
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    if (done) {
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        emscripten_cancel_main_loop();
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    }
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#endif
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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;
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    Uint32 then, now, frames;
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    Uint64 seed;
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    const char *icon = "icon.bmp";
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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 = SDLTest_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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   283
    for (i = 1; i < argc;) {
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        int consumed;
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        consumed = SDLTest_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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   290
                if (argv[i + 1]) {
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   291
                    if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
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   292
                        blendMode = SDL_BLENDMODE_NONE;
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   293
                        consumed = 2;
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   294
                    } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
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                        blendMode = SDL_BLENDMODE_BLEND;
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   296
                        consumed = 2;
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   297
                    } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
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   298
                        blendMode = SDL_BLENDMODE_ADD;
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   299
                        consumed = 2;
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   300
                    } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
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   301
                        blendMode = SDL_BLENDMODE_MOD;
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   302
                        consumed = 2;
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   303
                    } else if (SDL_strcasecmp(argv[i + 1], "sub") == 0) {
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                        blendMode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_SUBTRACT, SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_SUBTRACT);
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                        consumed = 2;
slouken@1916
   306
                    }
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   307
                }
aschiffler@7315
   308
            } else if (SDL_strcasecmp(argv[i], "--iterations") == 0) {
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   309
                if (argv[i + 1]) {
aschiffler@7315
   310
                    iterations = SDL_atoi(argv[i + 1]);
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   311
                    if (iterations < -1) iterations = -1;
aschiffler@7315
   312
                    consumed = 2;
aschiffler@7315
   313
                }
slouken@1985
   314
            } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
slouken@1985
   315
                cycle_color = SDL_TRUE;
slouken@1985
   316
                consumed = 1;
slouken@1985
   317
            } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
slouken@1985
   318
                cycle_alpha = SDL_TRUE;
slouken@1985
   319
                consumed = 1;
slouken@1916
   320
            } else if (SDL_isdigit(*argv[i])) {
slouken@1916
   321
                num_sprites = SDL_atoi(argv[i]);
slouken@1916
   322
                consumed = 1;
slouken@7502
   323
            } else if (argv[i][0] != '-') {
slouken@7502
   324
                icon = argv[i];
slouken@7502
   325
                consumed = 1;
slouken@1916
   326
            }
slouken@1915
   327
        }
slouken@1914
   328
        if (consumed < 0) {
aschiffler@7639
   329
            SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha] [--iterations N] [num_sprites] [icon.bmp]\n",
slouken@6785
   330
                    argv[0], SDLTest_CommonUsage(state));
slouken@1895
   331
            quit(1);
slouken@1895
   332
        }
slouken@1914
   333
        i += consumed;
slouken@1895
   334
    }
slouken@6785
   335
    if (!SDLTest_CommonInit(state)) {
slouken@1914
   336
        quit(2);
slouken@1895
   337
    }
slouken@1895
   338
slouken@1895
   339
    /* Create the windows, initialize the renderers, and load the textures */
slouken@1914
   340
    sprites =
slouken@3685
   341
        (SDL_Texture **) SDL_malloc(state->num_windows * sizeof(*sprites));
slouken@1914
   342
    if (!sprites) {
aschiffler@7639
   343
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!\n");
slouken@1895
   344
        quit(2);
slouken@1895
   345
    }
slouken@1914
   346
    for (i = 0; i < state->num_windows; ++i) {
slouken@5147
   347
        SDL_Renderer *renderer = state->renderers[i];
slouken@5147
   348
        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
slouken@5147
   349
        SDL_RenderClear(renderer);
slouken@1895
   350
    }
slouken@7502
   351
    if (LoadSprite(icon) < 0) {
slouken@1895
   352
        quit(2);
slouken@1895
   353
    }
slouken@1895
   354
slouken@1895
   355
    /* Allocate memory for the sprite info */
slouken@1895
   356
    positions = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));
slouken@1895
   357
    velocities = (SDL_Rect *) SDL_malloc(num_sprites * sizeof(SDL_Rect));
slouken@1895
   358
    if (!positions || !velocities) {
aschiffler@7639
   359
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!\n");
slouken@1895
   360
        quit(2);
slouken@1895
   361
    }
aschiffler@7315
   362
aschiffler@7315
   363
    /* Position sprites and set their velocities using the fuzzer */ 
aschiffler@7315
   364
    if (iterations >= 0) {
aschiffler@7315
   365
        /* Deterministic seed - used for visual tests */
aschiffler@7315
   366
        seed = (Uint64)iterations;
aschiffler@7315
   367
    } else {
aschiffler@7315
   368
        /* Pseudo-random seed generated from the time */
aschiffler@7315
   369
        seed = (Uint64)time(NULL);
aschiffler@7315
   370
    }
aschiffler@7315
   371
    SDLTest_FuzzerInit(seed);
slouken@1895
   372
    for (i = 0; i < num_sprites; ++i) {
aschiffler@7315
   373
        positions[i].x = SDLTest_RandomIntegerInRange(0, state->window_w - sprite_w);
aschiffler@7315
   374
        positions[i].y = SDLTest_RandomIntegerInRange(0, state->window_h - sprite_h);
slouken@1895
   375
        positions[i].w = sprite_w;
slouken@1895
   376
        positions[i].h = sprite_h;
slouken@1895
   377
        velocities[i].x = 0;
slouken@1895
   378
        velocities[i].y = 0;
slouken@1895
   379
        while (!velocities[i].x && !velocities[i].y) {
aschiffler@7315
   380
            velocities[i].x = SDLTest_RandomIntegerInRange(-MAX_SPEED, MAX_SPEED);
aschiffler@7315
   381
            velocities[i].y = SDLTest_RandomIntegerInRange(-MAX_SPEED, MAX_SPEED);
slouken@1895
   382
        }
slouken@1895
   383
    }
slouken@1895
   384
slouken@1915
   385
    /* Main render loop */
slouken@1895
   386
    frames = 0;
slouken@1895
   387
    then = SDL_GetTicks();
slouken@1895
   388
    done = 0;
icculus@9278
   389
icculus@9278
   390
#ifdef __EMSCRIPTEN__
icculus@9278
   391
    emscripten_set_main_loop(loop, 0, 1);
icculus@9278
   392
#else
slouken@1895
   393
    while (!done) {
slouken@1895
   394
        ++frames;
icculus@9278
   395
        loop();
slouken@1895
   396
    }
icculus@9278
   397
#endif
slouken@1895
   398
slouken@1895
   399
    /* Print out some timing information */
slouken@1895
   400
    now = SDL_GetTicks();
slouken@1895
   401
    if (now > then) {
slouken@2786
   402
        double fps = ((double) frames * 1000) / (now - then);
aschiffler@7639
   403
        SDL_Log("%2.2f frames per second\n", fps);
slouken@1895
   404
    }
slouken@1895
   405
    quit(0);
slouken@5147
   406
    return 0;
slouken@1895
   407
}
slouken@1895
   408
slouken@1895
   409
/* vi: set ts=4 sw=4 expandtab: */