shaderlib/occluder.glsl

   1 import msp_interface;
   2
   3 layout(set=1) uniform AlphaCutoff
   4 {
   5         float alpha_cutoff;
   6 };
   7
   8 layout(set=1) uniform sampler2D alpha_map;
   9
  10 layout(constant_id=auto) const bool use_alpha_cutoff = false;
  11 layout(constant_id=auto) const bool use_instancing = false;
  12
  13 #pragma MSP stage(vertex)
  14 virtual vec4 get_vertex_position()
  15 {
  16         return vertex;
  17 }
  18
  19 virtual mat4 get_vertex_transform()
  20 {
  21         if(use_instancing)
  22                 return transpose(mat4(instance_transform[0], instance_transform[1], instance_transform[2], vec4(0.0, 0.0, 0.0, 1.0)));
  23         else
  24                 return world_obj_matrix;
  25 }
  26
  27 virtual void clipping(vec3 eye_vertex)
  28 {
  29 }
  30
  31 void main()
  32 {
  33         vec4 eye_vertex = eye_world_matrix*get_vertex_transform()*get_vertex_position();
  34         clipping(eye_vertex.xyz);
  35         gl_Position = clip_eye_matrix*eye_vertex;
  36         passthrough;
  37 }
  38
  39 #pragma MSP stage(fragment)
  40 layout(location=0) out vec4 frag_color;
  41
  42 void main()
  43 {
  44         if(use_alpha_cutoff)
  45         {
  46                 float alpha = texture(alpha_map, texcoord.xy).a;
  47                 if(alpha<alpha_cutoff)
  48                         discard;
  49                 frag_color = vec4(1.0);
  50         }
  51 }