layout (points) in;
layout (triangle_strip) out;
layout (max_vertices = 4) out;

// OF handled uniforms and attributes.
uniform mat4 projectionMatrix;

// App specific uniforms and attributes.
// uniform float uSpriteSize;

in vec4 vPosition[];
in vec2 vTexCoord[];
flat in int vValid[];

out vec2 texCoordVarying;
in vec3 vPos[];
in vec4 vTarget[];
in float vTemperature[];
in float vAge[];

// out vec2 gTexCoord;
out vec3 gPos;
out vec4 gTarget;
out float gTemperature;
out float gAge;

void main()
{
  float uSpriteSize = 1.5;
  // if (vValid[0] == 0) return;

  texCoordVarying = vTexCoord[0];
  gPos = vPos[0];
  gTarget = vTarget[0];
  gTemperature = vTemperature[0];
  gAge = vAge[0];

  for (int i = 0; i < gl_in.length(); ++i)
  {
    gl_Position = projectionMatrix * (vPosition[i] + vec4(1.0, -1.0, 0.0, 0.0) * uSpriteSize);
    EmitVertex();

    gl_Position = projectionMatrix * (vPosition[i] + vec4(1.0, 1.0, 0.0, 0.0) * uSpriteSize);
    EmitVertex();

    gl_Position = projectionMatrix * (vPosition[i] + vec4(-1.0, -1.0, 0.0, 0.0) * uSpriteSize);
    EmitVertex();

    gl_Position = projectionMatrix * (vPosition[i] + vec4(-1.0, 1.0, 0.0, 0.0) * uSpriteSize);
    EmitVertex();

    EndPrimitive();
  }
}