sprite_fragment_shader.glsl

// Source code of fragment shader
#version 130

// Attributes passed from the vertex shader
in vec4 color_interp;
in vec2 uv_interp;

// Texture sampler
uniform sampler2D onetex;
uniform int dbg_red;
uniform vec3 color_modifier;


void main()
{
    // Sample texture
    vec4 color = texture2D(onetex, uv_interp);
    color.rgb *= color_modifier;

    
    if(dbg_red == 1)
	{
		gl_FragColor = vec4(1.0, 0.0, 0.0, color.a);
	}
    else {
        // Assign color to fragment
        gl_FragColor = vec4(color.r, color.g, color.b, color.a);

    }

    // Check for transparency
    if(color.a < 1.0)
    {
         discard;
    }
}