multipass reads wrong buffer

[dtristram]

multipass buffer access seems broken

after initializing contents of two buffers, first pass can read first buffer, but second pass gets pixels from the first buffer, not the second as expected.

Code: Select all

/*{
    "CREDIT": "dtristram",
    "DESCRIPTION": "illustrates bug in multipass support, note image 1 updates for 2 seconds then becomes static, then after four seconds, reading from store2 gives the pixels from store1",
    "CATEGORIES": [ "generator" ],
    "INPUTS": [
        {
            "TYPE": "image",
            "NAME": "image1",
            "LABEL": "Image 1",
        },
	{
	    "TYPE": "image",
	    "NAME": "image2",
	    "LABEL": "Image 2",
	}
    ],
    "PASSES": [
        {
	    "TARGET": "store1",
	    "PERSISTENT": true,
	},
        {
	    "TARGET": "store2",
	    "PERSISTENT": true,
	},
	{},
   ]
}*/

int init_delay = 2;

void main() {
  
  vec4 color1;
  vec4 color2;
  vec4 c;

  switch (PASSINDEX) {

  case 0:
    if (TIME < init_delay) {
      c = IMG_THIS_PIXEL(image1);
    } else {
      c = IMG_THIS_PIXEL(store1);
    }
    break;

  case 1:
    if (TIME < 2 * init_delay) {
      c = IMG_THIS_PIXEL(image2);
    } else {
      c = IMG_THIS_PIXEL(store2);
    }
    break;

  case 2:
    color1 = IMG_THIS_PIXEL(store1);
    color2 = IMG_THIS_PIXEL(store2);

    c = mix(color1, color2, 0.5);
    break;
  }

  gl_FragColor = c;
}