shader.sj

boxShader : shader("shaders/v3f-c4f.vert", "shaders/v3f-c4f.frag")
imageShader : shader("shaders/v3f-t2f.vert", "shaders/v3f-t2f.frag")
phongColorShader : shader("shaders/v3f-n3f-phong.vert", "shaders/v3f-n3f-phong.frag")
phongTextureShader : shader("shaders/v3f-t2f-n3f-phong.vert", "shaders/v3f-t2f-n3f-phong.frag")
textShader : shader("shaders/v3f-t2f-c4f.vert", "shaders/v3f-t2f-c4f.frag")

shader(
    vertex : 'string
    pixel : 'string
    --cvar--
    GLuint id;
    --cvar--
) {
    --c--
    _this->id = shader_load((char*)_this->vertex.data.data, (char*)_this->pixel.data.data);
    --c--
    this
} copy {
    --c--
    _this->id = _from->id;
    glid_retain(_this->id);
    --c--
} destroy {
    --c--
    if (glid_release(_this->id)) {
        glDeleteShader(_this->id);
    }
    --c--
}

--cdefine--
/* Freetype GL - A C OpenGL Freetype engine
 *
 * Distributed under the OSI-approved BSD 2-Clause License.  See accompanying
 * file `LICENSE` for more details.
 */

/**
 * Read a fragment or vertex shader from a file
 *
 * @param filename file to read shader from
 * @return         a newly-allocated text buffer containing code. This buffer
 *                 must be freed after usage.
 *
 */
  char *
  shader_read( const char *filename );


/**
 * Compile a shader from a text buffer.
 *
 * @param source code of the shader
 * @param type   type of the shader
 *
 * @return a handle on the compiled program
 *
 */
  GLuint
  shader_compile( const char* source,
                  const GLenum type );


/**
 * Load a vertex and fragment shader sources and build program
 *
 * @param  vert_filename vertex shader filename
 * @param  frag_filename fragment shader filename
 *
 * @return a handle on the built program
 *
 */
  GLuint
  shader_load( const char * vert_filename,
               const char * frag_filename );    
--cdefine--

--cfunction--
#include(<stdio.h>)
#include(<stdlib.h>)
#include(<string.h>)

char *repl_str(const char *str, const char *from, const char *to) {

    /* Adjust each of the below values to suit your needs. */

    /* Increment positions cache size initially by this number. */
    size_t cache_sz_inc = 16;
    /* Thereafter, each time capacity needs to be increased,
     * multiply the increment by this factor. */
    const size_t cache_sz_inc_factor = 3;
    /* But never increment capacity by more than this number. */
    const size_t cache_sz_inc_max = 1048576;

    char *pret, *ret = NULL;
    const char *pstr2, *pstr = str;
    size_t i, count = 0;
##if (__STDC_VERSION__ >= 199901L)
    uintptr_t *pos_cache_tmp, *pos_cache = NULL;
##else
    ptrdiff_t *pos_cache_tmp, *pos_cache = NULL;
##endif
    size_t cache_sz = 0;
    size_t cpylen, orglen, retlen, tolen = 0, fromlen = strlen(from);

    /* Find all matches and cache their positions. */
    while ((pstr2 = strstr(pstr, from)) != NULL) {
        count++;

        /* Increase the cache size when necessary. */
        if (cache_sz < count) {
            cache_sz += cache_sz_inc;
            pos_cache_tmp = realloc(pos_cache, sizeof(*pos_cache) * cache_sz);
            if (pos_cache_tmp == NULL) {
                goto end_repl_str;
            } else pos_cache = pos_cache_tmp;
            cache_sz_inc *= cache_sz_inc_factor;
            if (cache_sz_inc > cache_sz_inc_max) {
                cache_sz_inc = cache_sz_inc_max;
            }
        }

        pos_cache[count-1] = pstr2 - str;
        pstr = pstr2 + fromlen;
    }

    orglen = pstr - str + strlen(pstr);

    /* Allocate memory for the post-replacement string. */
    if (count > 0) {
        tolen = strlen(to);
        retlen = orglen + (tolen - fromlen) * count;
    } else  retlen = orglen;
    ret = malloc(retlen + 1);
    if (ret == NULL) {
        goto end_repl_str;
    }

    if (count == 0) {
        /* If no matches, then just duplicate the string. */
        strcpy(ret, str);
    } else {
        /* Otherwise, duplicate the string whilst performing
         * the replacements using the position cache. */
        pret = ret;
        memcpy(pret, str, pos_cache[0]);
        pret += pos_cache[0];
        for (i = 0; i < count; i++) {
            memcpy(pret, to, tolen);
            pret += tolen;
            pstr = str + pos_cache[i] + fromlen;
            cpylen = (i == count-1 ? orglen : pos_cache[i+1]) - pos_cache[i] - fromlen;
            memcpy(pret, pstr, cpylen);
            pret += cpylen;
        }
        ret[retlen] = '\0';
    }

end_repl_str:
    /* Free the cache and return the post-replacement string,
     * which will be NULL in the event of an error. */
    free(pos_cache);
    return ret;
}

// ------------------------------------------------------------ shader_read ---
char *
shader_read( const char *filename )
{
    FILE * file;
    char * buffer;
    size_t size;

##ifdef WIN32
    errno_t err;
    if( (err  = fopen_s( &file, filename, "rb" )) !=0 ) {
##else
    file = fopen( filename, "rb" );
    if( !file ) {
##endif
        fprintf( stderr, "Unable to open file \"%s\".\n", filename );
        return 0;
    }
    fseek( file, 0, SEEK_END );
    size = ftell( file );
    fseek(file, 0, SEEK_SET );
    buffer = (char *) malloc( (size+1) * sizeof( char *) );
    fread( buffer, sizeof(char), size, file );
    buffer[size] = 0;
    fclose( file );

##ifdef __APPLE__
    char* prev = buffer;
    buffer = repl_str(buffer, "mediump", "");
    free(prev);
##endif

    return buffer;
}



// --------------------------------------------------------- shader_compile ---
GLuint
shader_compile( const char* source,
                const GLenum type )
{
    GLint compile_status;
    GLuint handle = glCreateShader( type );
    glShaderSource( handle, 1, &source, 0 );
    glCompileShader( handle );

    glGetShaderiv( handle, GL_COMPILE_STATUS, &compile_status );
    if( compile_status == GL_FALSE )
    {
        GLchar messages[256];
        glGetShaderInfoLog( handle, sizeof(messages), 0, &messages[0] );
        halt("%s: %s\n", source, messages);
    }
    return handle;
}


// ------------------------------------------------------------ shader_load ---
GLuint
shader_load( const char * vert_filename,
              const char * frag_filename )
{
    GLuint handle = glCreateProgram( );
    GLint link_status;

    if( vert_filename && strlen( vert_filename ) )
    {
        char *vert_source = shader_read( vert_filename );
        GLuint vert_shader = shader_compile( vert_source, GL_VERTEX_SHADER);
        glAttachShader( handle, vert_shader);
        glDeleteShader( vert_shader );
        free( vert_source );
    }
    if( frag_filename && strlen( frag_filename ) )
    {
        char *frag_source = shader_read( frag_filename );
        GLuint frag_shader = shader_compile( frag_source, GL_FRAGMENT_SHADER);
        glAttachShader( handle, frag_shader);
        glDeleteShader( frag_shader );
        free( frag_source );
    }

    glLinkProgram( handle );

    glGetProgramiv( handle, GL_LINK_STATUS, &link_status );
    if (link_status == GL_FALSE)
    {
        GLchar messages[256];
        glGetProgramInfoLog( handle, sizeof(messages), 0, &messages[0] );
        halt("%s\n", messages );
    }
    return handle;
}

--cfunction--