#version 150

attribute vec3 gpu_Vertex;
attribute vec2 gpu_TexCoord;
attribute vec4 gpu_Color;
uniform mat4 gpu_ModelViewProjectionMatrix;

varying vec4 color;
varying vec2 texCoord;

void main (void) {

    color = gpu_Color;
    texCoord = vec2 (gpu_TexCoord);

    gl_Position = gpu_ModelViewProjectionMatrix * vec4 (gpu_Vertex, 1.0);

}

#version 150

varying vec4 color;
varying vec2 texCoord;

uniform sampler2D tex;

void main (void) {

    gl_FragColor = texture (tex, texCoord);

}

#version 150

varying vec4 color;
varying vec2 texCoord;
varying float healthFloat;

uniform sampler2D tex;
uniform float health;

void main (void) {

    vec4 texColor = texture (tex, texCoord);

    if (texColor.x <= health) {

        texColor = vec4 (1.0, 0.0, 0.0, 0.8);

    } else {

        texColor = vec4 (0.0, 0.0, 0.0, 0.0);

    }

    gl_FragColor = texColor;

}