[Impeller] Vulkan runtime effect uniform packing chooses incorrect binding slot. #150324
Description
The following shader is valid when targeting impeller/vulkan:
#include <flutter/runtime_effect.glsl>
uniform vec2 size;
uniform sampler2D input_texture;
out vec4 frag_color;
void main() {
frag_color = texture(input_texture, FlutterFragCoord().xy / size);
}
But this one is not:
#include <flutter/runtime_effect.glsl>
uniform sampler2D input_texture;
uniform vec2 size;
out vec4 frag_color;
void main() {
frag_color = texture(input_texture, FlutterFragCoord().xy / size);
}In reflector.cc we force the synthetic UBO to have binding 64, but that doesn't work correctly if another uniform would have that binding instead. We need to compute the correct binding values.