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++;
                }
        }

#version 410 core

out vec4 fragColor;
in vec2 texCoord;

uniform sampler2D utexture;
uniform vec4 color;

void main() {
    vec4 tex = texture(utexture, texCoord);
    fragColor = tex * color; // Вот эта строчка
}