[require]
GLSL >= 1.10

[vertex shader]
attribute vec4 v_position;
attribute vec4 v_texcoord0;
varying vec2 source_texture;
void main()
{
	gl_Position = v_position;
	source_texture = v_texcoord0.xy;
}

[fragment shader]
#ifdef GL_ES
precision mediump float;
#endif
varying vec2 source_texture;
uniform sampler2D sampler;
uniform int revert;
uniform int swap_rb;
#define REVERT_NONE       			0
#define REVERT_NORMAL     			1
#define SWAP_NONE_DOWNLOADING  		0
#define SWAP_DOWNLOADING  			1
#define SWAP_UPLOADING	  		2
#define SWAP_NONE_UPLOADING		3
void main()
{
   vec4 color = texture2D(sampler, source_texture);
   if (revert == REVERT_NONE) 
    { 
     if ((swap_rb != SWAP_NONE_DOWNLOADING) && (swap_rb != SWAP_NONE_UPLOADING))   
		gl_FragColor = vec4(color.bgr, 1);
     else 
		gl_FragColor = vec4(color.rgb, 1);
    } 
   else 
    { 
     if (swap_rb == SWAP_DOWNLOADING)   
		gl_FragColor = vec4(1, color.rgb);
     else if (swap_rb == SWAP_NONE_DOWNLOADING)
		gl_FragColor = vec4(1, color.bgr);
     else if (swap_rb == SWAP_UPLOADING)
		gl_FragColor = vec4(color.gba, 1);
     else if (swap_rb == SWAP_NONE_UPLOADING)
		gl_FragColor = vec4(color.abg, 1);
    } 
}