glgettexenv.c

/*
 * Copyright 2014 The Emscripten Authors.  All rights reserved.
 * Emscripten is available under two separate licenses, the MIT license and the
 * University of Illinois/NCSA Open Source License.  Both these licenses can be
 * found in the LICENSE file.
 */

/*
THIS WORK, INCLUDING THE SOURCE CODE, DOCUMENTATION
AND RELATED MEDIA AND DATA, IS PLACED INTO THE PUBLIC DOMAIN.

THE ORIGINAL AUTHOR IS KYLE FOLEY.

THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY
OF ANY KIND, NOT EVEN THE IMPLIED WARRANTY OF
MERCHANTABILITY. THE AUTHOR OF THIS SOFTWARE,
ASSUMES _NO_ RESPONSIBILITY FOR ANY CONSEQUENCE
RESULTING FROM THE USE, MODIFICATION, OR
REDISTRIBUTION OF THIS SOFTWARE.
*/

#ifndef __EMSCRIPTEN__
#define USE_GLEW 1
#endif

#if USE_GLEW
#include "GL/glew.h"
#endif

#include "SDL/SDL.h"
#if !USE_GLEW
#include "SDL/SDL_opengl.h"
#endif

#include <stdio.h>
#include <string.h>
#include <assert.h>

int main(int argc, char *argv[])
{
    SDL_Surface *screen;
    if ( SDL_Init(SDL_INIT_VIDEO) != 0 ) {
        printf("Unable to initialize SDL: %s\n", SDL_GetError());
        return 1;
    }

    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
    screen = SDL_SetVideoMode( 640, 480, 24, SDL_OPENGL );
    if ( !screen ) {
        printf("Unable to set video mode: %s\n", SDL_GetError());
        return 1;
    }

    GLint value = 0;
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND);
    glGetTexEnviv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, &value);
    assert(value == GL_BLEND);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
    glGetTexEnviv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, &value);
    assert(value == GL_MODULATE);

    GLfloat colora[4] = { 0.2f, 0.3f, 0.4f, 0.5f };
    GLfloat colorb[4] = {};
    glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, colora);
    glGetTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, colorb);
    printf("%f %f %f %f\n", colorb[0], colorb[1], colorb[2], colorb[3]);
    assert(colora[0] == colorb[0]);
    assert(colora[1] == colorb[1]);
    assert(colora[2] == colorb[2]);
    assert(colora[3] == colorb[3]);
    SDL_Quit();
    
#ifdef REPORT_RESULT
    REPORT_RESULT(1);
#endif
    return 0;
}