Initial commit

shader/trans.frag

@@ -0,0 +1,23 @@
+
+/* Fragment shader dealing with transitions */
+
+uniform sampler2D currentScene;
+uniform sampler2D frozenScene;
+uniform sampler2D transMap;
+/* Normalized */
+uniform float prog;
+/* Vague [0, 512] normalized */
+uniform float vague;
+
+void main()
+{
+    vec2 texCoor = gl_TexCoord[0].st;
+    float transV = texture2D(transMap, texCoor).r;
+    float cTransV = clamp(transV, prog, prog+vague);
+    float alpha = (cTransV - prog) / vague;
+    
+    vec4 newFrag = texture2D(currentScene, texCoor);
+    vec4 oldFrag = texture2D(frozenScene, texCoor);
+    
+    gl_FragColor = mix(newFrag, oldFrag, alpha);
+}