Witch of Git - lovr-particles/blob - shaders/particles.vert

   1 in vec2 vertPosition;
   2 out vec2 uv;
   3 uniform vec3 headPos;
   4 uniform int batchSize;
   5 layout(std430) buffer particleDataBuffer { vec4 particleData[]; };
   6
   7 vec4 position(mat4 projection, mat4 transform, vec4 vertex) {
   8   int index = gl_VertexID / 4 + gl_InstanceID * batchSize;
   9   vec3 pos = particleData[index].xyz;
  10   float size = particleData[index].w;
  11   uv = vertPosition * 0.5 + 0.5;
  12
  13   vec3 forward = normalize(pos - headPos);
  14   vec3 right = normalize(cross(forward, vec3(0, 1, 0)));
  15   vec3 up = cross(right, forward);
  16   vec3 offset = mat2x3(up, right) * (vertPosition * size);
  17
  18   return projection * transform * vec4(pos + offset, 1.0);
  19 }