//vertex:

varying vec2 uv;
varying vec2 rcoords;
varying vec3 viewDir, pos;
uniform vec4 sprite_pos;
uniform float time;

void main() {
	// put the frame animation calculation here instead of in the pixel shader
/*
	vec2 uvCenter = gl_MultiTexCoord0.xy - 0.5;
	float frames = 64.0;
	float rows = 16.0;
	float colums = 4.0;
	float rowX = frames / rows;
	float floorOpX = floor((1.0 - gl_Color.a) * frames) * 0.25;
	float calcX = (1.0/ rowX) * mod(floorOpX, rowX);
	float runX  = uvCenter.x/rows + calcX;

	float floorOpY = floor(floorOpX / rowX);
	float calcY = (1.0 / colums) * floorOpY;
	float runY = uvCenter.y / colums + calcY;

	float runXoffset = runX + (1.0/rows) * 0.5;
	runXoffset = clamp(runXoffset + ((runX - calcX) * 3.0), calcX, calcX + 1.0/rows);
	runY = clamp(runY + (runY - calcY), calcY, calcY + 1.0/colums);

	uv = vec2(runXoffset, runY);
	*/
	uv = gl_MultiTexCoord0.xy;

	rcoords = ((uv - sprite_pos.xy) / (sprite_pos.zw - sprite_pos.xy) - vec2(0.5, 0.5)) * 2.0;

	gl_FrontColor = gl_Color;
	gl_BackColor = gl_Color;

	pos = (gl_ModelViewMatrix * gl_Vertex).xyz;

	viewDir = (gl_NormalMatrix * vec3(1.0,0.0,0.0)).xyz;

	gl_Position = ftransform();
}




//fragment:


#120
varying vec2 uv;
uniform sampler2D texture;
uniform float time;

void main()
{

	vec2 uvCenter = uv - 0.5;
	float frames = 64.0;
	float rows = 16.0;
	float colums = 4.0;
	float rowX = frames / rows;
	float floorOpX = floor((1.0 - gl_Color.a) * frames) * 0.25;
	float calcX = (1.0/ rowX) * mod(floorOpX, rowX);
	float runX  = uvCenter.x/rows + calcX;

	float floorOpY = floor(floorOpX / rowX);
	float calcY = (1.0 / colums) * floorOpY;
	float runY = uvCenter.y / colums + calcY;

	float runXoffset = runX + (1.0/rows) * 0.5;
	runXoffset = clamp(runXoffset + ((runX - calcX) * 3.0), calcX, calcX + 1.0/rows);
	runY = clamp(runY + (runY - calcY), calcY, calcY + 1.0/colums);

	vec3 sample = texture2D(texture, vec2(runXoffset, runY)).rgb;


//	vec3 sample = texture2D(texture, uv).rgb;

	if(sample.r < 0.01)
		discard;

	gl_FragColor.rgb = sample.rgb * 1.0;
	gl_FragColor.a = 0.0;
	}