port from perforce

hgplus/ShaderMinifier/tests/real/multitexture.frag

@@ -0,0 +1,21 @@
+uniform vec2 resolution;
+uniform float time;
+uniform sampler2D tex0;
+uniform sampler2D tex1;
+
+void main(void)
+{
+    vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / resolution.xy;
+    // a rotozoom
+    vec2 cst = vec2( cos(.5*time), sin(.5*time) );
+    mat2 rot = 0.5*cst.x*mat2(cst.x,-cst.y,cst.y,cst.x);
+    vec3 col1 = texture2D(tex0,rot*p).xyz;
+
+    // scroll
+    vec3 col2 = texture2D(tex1,0.5*p+sin(0.1*time)).xyz;
+
+    // blend layers
+    vec3 col = col2*col1;
+
+    gl_FragColor = vec4(col,1.0);
+}