git-svn-id: svn://db.shs.com.ru/libs@555 a8b55f48-bf90-11e4-a774-851b48703e85

qglview/shaders/dof.frag

@@ -0,0 +1,47 @@
+#version 150
+
+uniform float z_near, z_far;
+uniform sampler2D t0, td;
+uniform vec2 dt;
+uniform float radius, focus, diaphragm;
+
+float w, sum;
+const float _pe = 2.4e-7;
+
+vec4 getTexel(vec2 c, float coeff) {
+	vec4 ret = texture(t0, c);
+	float cw = texture(td, c).r;
+	cw = clamp(1. - abs(cw - w) * 1000, 0., 1.) * coeff;
+	sum += cw;
+	return ret * cw;
+}
+
+void main(void) {
+	vec2 tc = qgl_FragTexture.xy;
+	vec4 scol = texture(t0, tc);
+	w = texture(td, tc).r;
+	float z = w + w - 1;
+	z = ((_pe - 2.) * z_near) / (z + _pe - 1.); // infinite depth
+	z = 1./(z + 1);
+	float cf = 1./(focus + 1);
+	float factor = clamp(abs(z - cf) * diaphragm, 0, 100);
+	factor = 1. - 1. / (factor + 1.);
+	factor *= factor;
+	factor *= factor;
+	//factor *= factor;
+	factor *= radius;
+	vec2 cdt = factor * dt;
+	sum = 1.;
+	scol += getTexel(tc + (cdt * 1), 2.5);
+	scol += getTexel(tc + (cdt * 2), 2.0);
+	scol += getTexel(tc + (cdt * 3), 1.5);
+	scol += getTexel(tc + (cdt * 4), 1.0);
+	scol += getTexel(tc + (cdt * 5), 0.5);
+	scol += getTexel(tc + (cdt * -1), 2.5);
+	scol += getTexel(tc + (cdt * -2), 2.0);
+	scol += getTexel(tc + (cdt * -3), 1.5);
+	scol += getTexel(tc + (cdt * -4), 1.0);
+	scol += getTexel(tc + (cdt * -5), 0.5);
+	scol /= sum;
+	qgl_FragData[0].rgba = scol;
+}