// The (best) use of this shader is to observe at which native resolutions
// the PSX games are running.
// The distance between green lines is 100 pixels of PSX resolution
// when using internal High-X and High-Y resolution.

uniform vec4 OGL2Size;
uniform sampler2D OGL2Texture;

void main()
{
vec2 pos = vec2(OGL2Size.xy*gl_TexCoord[0].xy);
float x = fract(pos.x/200.0);
float y = fract(pos.y/200.0);

if ((x < 0.01) || (y < 0.01)) gl_FragColor = vec4 (0.0, 1.0, 0.0,1.0);
else
gl_FragColor = texture2D(OGL2Texture, gl_TexCoord[0].xy); 
}