#version 300 es
layout ( location = 0 ) in vec2 position;
layout ( location = 1 ) in vec2 texCoord;
uniform mat4 transform;
uniform mat4 ortho;
out vec2 v_tex_coord;
void main ( )
{
        gl_Position = ortho * transform * vec4 ( position, 0.0, 1.0 );
        v_tex_coord = texCoord;
}

                        data [ 4 * i + 3 ] = w->w [ i ];

void Font::word_set_size ( struct word *word, int w, int h ) {
        if ( !word->vertex ) word->vertex = new float [ 12 ];
        if ( !word->texture ) word->texture = new float [ 12 ];

        word->vertex[0] = 0;
        word->vertex[1] = 0;
        word->vertex[2] = 0;
        word->vertex[3] = h;
        word->vertex[4] = w;
        word->vertex[5] = 0;
        word->vertex[6] = w;
        word->vertex[7] = 0;
        word->vertex[8] = w;
        word->vertex[9] = h;
        word->vertex[10] = 0;
        word->vertex[11] = h;

        word->texture[0] = 0;
        word->texture[1] = 1;
        word->texture[2] = 0;
        word->texture[3] = 0;
        word->texture[4] = 1;
        word->texture[5] = 1;
        word->texture[6] = 1;
        word->texture[7] = 1;
        word->texture[8] = 1;
        word->texture[9] = 0;
        word->texture[10] = 0;
        word->texture[11] = 0;
}

void Font::build_texture ( struct word *w ) {
        unsigned int size = w->width * 4 * w->height;
        unsigned char *data = (unsigned char *) calloc ( size, 1 );

        for ( unsigned int i = 0, y = 0; y < w->height; y++ ) {
                for ( int x = 0; x < w->width; x++ ) {
                        data [ 4 * i + 3 ] = w->w [ i ];
                        data [ 4 * i + 0 ] = ( w->color >> 16 & 0xff );
                        data [ 4 * i + 1 ] = ( w->color >>  8 & 0xff );
                        data [ 4 * i + 2 ] = ( w->color >>  0 & 0xff );
                        i++;
                }
        }

        if ( w->textureid > 0 ) glDeleteTextures ( 1, &w->textureid );

        glGenTextures ( 1, &w->textureid );
        glBindTexture ( GL_TEXTURE_2D, w->textureid );
        glTexImage2D ( GL_TEXTURE_2D, 0, GL_RGBA, w->width, w->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data );

#if 0
        glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
        glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
#endif
        glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
        glTexParameteri ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

        free ( data );

        word_set_size ( w, w->width, w->height );
}

void Font::draw ( ) {
        glUseProgram ( this->program );

        glActiveTexture ( GL_TEXTURE0 );
        glEnableVertexAttribArray ( 0 );
        glEnableVertexAttribArray ( 1 );
        for ( int i = 0; i < this->size_of_word; i++ ) {
                struct word *w = &this->word[i];
                glBindTexture ( GL_TEXTURE_2D, w->textureid );
                glUniform1i ( this->sampler_location, 0 );

                glUniformMatrix4fv ( this->transform_location, 1, GL_FALSE, &w->translate[0][0] );
                glUniformMatrix4fv ( this->proj_location, 1, GL_FALSE, &this->proj[0][0] );

                glVertexAttribPointer ( 0, 2, GL_FLOAT, GL_FALSE, 0, w->vertex );
                glVertexAttribPointer ( 1, 2, GL_FLOAT, GL_FALSE, 0, w->texture );

                glDrawArrays ( GL_TRIANGLES, 0, 12 );
        }
        glDisableVertexAttribArray ( 0 );
        glDisableVertexAttribArray ( 1 );
}