added and tweaked effects

effects/bulge.frag

@@ -26,6 +26,6 @@ void main(void) {
 	if (uv.x >= 0.0 && uv.x <= 1.0 && uv.y >= 0.0 && uv.y <= 1.0) {
 		gl_FragColor = texture2D(tex0, uv);
 	} else {
-		gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
+		discard;
 	}	
 }

effects/posterize.frag

@@ -0,0 +1,19 @@
+#version 110
+
+uniform sampler2D sceneTex; // 0
+uniform float gamma_cent; // 0.6
+uniform float numColors; // 8.0
+
+varying vec2 vTexCoord;
+
+void main() {
+	float gamma = gamma_cent*0.01;
+	vec4 color = texture2D(sceneTex, vTexCoord);
+	vec3 c = color.rgb;
+	c = pow(c, vec3(gamma, gamma, gamma));
+	c = c * numColors;
+	c = floor(c);
+	c = c / numColors;
+	c = pow(c, vec3(1.0/gamma));
+	gl_FragColor = vec4(c, color.a);
+}

effects/posterize.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<effect name="Posterize" category="Stylize">
+	<row name="Colors">
+		<field type="double" min="0" default="8" id="numColors"/>
+	</row>
+	<row name="Gamma">
+		<field type="double" min="0" default="60" id="gamma_cent"/>
+	</row>
+	<shader vert="common.vert" frag="posterize.frag"/>
+</effect>

effects/ripple.frag

@@ -0,0 +1,34 @@
+#version 110
+
+varying vec2 vTexCoord;
+
+uniform float speed;
+uniform float intensity;
+uniform float frequency;
+uniform float xoff;
+uniform float yoff;
+uniform bool reverse;
+uniform bool stretch;
+
+uniform vec2 resolution; // Screen resolution
+uniform float time; // time in seconds
+uniform sampler2D tex0; // scene buffer
+
+void main(void) {
+	vec2 texCoord = vTexCoord;
+	vec2 center = vec2(1.0);
+
+	if (!stretch) {
+		texCoord.x *= (resolution.x/resolution.y);
+		center.x += (resolution.x/resolution.y)/2.0;
+	}
+
+	center += vec2(xoff, yoff)*0.01;
+
+	float real_time = (reverse) ? -time : time;
+
+	vec2 p = 2.0 * texCoord - center;
+	float len = length(p);
+	vec2 uv = vTexCoord + (p/len)*cos((frequency*0.01)*(len*12.0-real_time*(speed*0.05)))*(intensity*0.0005);
+	gl_FragColor = texture2D(tex0,uv);  
+}

effects/ripple.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<effect name="Ripple" category="Distort">
+	<row name="Speed">
+		<field type="double" min="0" default="100" id="speed"/>
+	</row>
+	<row name="Intensity">
+		<field type="double" min="0" default="100" id="intensity"/>
+	</row>
+	<row name="Frequency">
+		<field type="double" min="0" default="100" id="frequency"/>
+	</row>
+	<row name="Reverse">
+		<field type="bool" default="0" id="reverse"/>
+	</row>
+	<row name="Stretch">
+		<field type="bool" default="0" id="stretch"/>
+	</row>
+	<row name="Center">
+		<field type="double" default="0" id="xoff"/>
+		<field type="double" default="0" id="yoff"/>
+	</row>
+	<shader vert="common.vert" frag="ripple.frag"/>
+</effect>

effects/sphere.frag

@@ -0,0 +1,45 @@
+#version 110
+
+varying vec2 vTexCoord;
+
+uniform vec2 resolution; // Screen resolution
+uniform sampler2D tex0; // scene buffer
+
+uniform float xoff;
+uniform float yoff;
+uniform float scale;
+uniform bool tile;
+uniform bool hide_edges;
+uniform bool stretch;
+
+void main(void) {
+	vec2 texCoord = vTexCoord;
+
+	vec2 offset = vec2(1.0);
+
+	if (!stretch) {
+		if (resolution.x > resolution.y) {
+			offset.x = (resolution.x/resolution.y);
+			texCoord.x *= offset.x;
+		} else {
+			offset.y = (resolution.y/resolution.x);
+			texCoord.y *= offset.y;
+		}
+	}
+
+	vec2 p = 2.0 * texCoord - offset;
+	vec2 adj_tc = 2.0 * vTexCoord - 1.0;
+	float r = dot(p,p);
+	if (r > 1.0) discard; 
+	float f = (1.0-sqrt(1.0-r))/(r);
+	vec2 uv;
+	uv.x = (adj_tc.x*(1.5-scale*0.01))*f+0.5-(xoff*0.01);
+	uv.y = (adj_tc.y*(1.5-scale*0.01))*f+0.5-(yoff*0.01);
+	if (tile) {
+		uv.x = mod(uv.x, 1.0);
+		uv.y = mod(uv.y, 1.0);
+	} else if (hide_edges && (uv.x < 0.0 || uv.x > 1.0 || uv.y < 0.0 || uv.y > 1.0)) {
+		discard;
+	}
+	gl_FragColor = vec4(texture2D(tex0,uv));
+}

effects/sphere.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<effect name="Sphere" category="Distort">
+	<row name="Center">
+		<field type="double" default="0" id="xoff"/>
+		<field type="double" default="0" id="yoff"/>
+	</row>
+	<row name="Scale">
+		<field type="double" default="75" max="150" id="scale"/>
+	</row>
+	<row name="Tile">
+		<field type="bool" default="1" id="tile"/>
+	</row>
+	<row name="Hide Edges">
+		<field type="bool" default="0" id="hide_edges"/>
+	</row>
+	<row name="Stretch">
+		<field type="bool" default="1" id="stretch"/>
+	</row>
+	<shader vert="common.vert" frag="sphere.frag"/>
+</effect>

effects/wave.frag

@@ -19,7 +19,7 @@ void main(void) {
 	}
 
 	if (y < 0.0 || y > 1.0 || x < 0.0 || x > 1.0) {
-		gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
+		discard;
 	} else {
 		vec4 textureColor = texture2D(myTexture, vec2(x, y));
 		gl_FragColor = vec4(