#include "camera.glsl"

// Shadows use a different format, so don't use draw_cmds_data.glsl
layout(std430, binding = 3) readonly buffer DrawCmdDatasShadow {
  // Access by gl_DrawID
  mat4 transforms[];
};

// Input, output blocks

#if VERTEX_SHADER

layout(location = 0) in vec3 aPos;

void main() {
    mat4 model = transforms[gl_DrawID];
    gl_Position = projection * view * model * vec4(aPos.xyz, 1.0);
}
#endif // VERTEX_SHADER

#if FRAGMENT_SHADER

out vec4 FragColor;

void main() {
  // Store moments for VSM
  float clamped_depth = clamp(gl_FragCoord.z, 0.0, 1.0);
  float dx = dFdx(clamped_depth);
  float dy = dFdy(clamped_depth);
  vec2 moments;
  moments.x = clamped_depth;
  moments.y = clamped_depth * clamped_depth + 0.25 * (dx * dx + dy * dy);
  moments.y = clamp(moments.y, 0.0, 1.0);
  FragColor = vec4(moments.x, moments.y, 0.0, 1.0);
}


#endif // FRAGMNET_SHADER