// deck.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors

export default `\
#version 300 es

#define SHADER_NAME scenegraph-layer-vertex-shader

// Instance attributes
in vec3 instancePositions;
in vec3 instancePositions64Low;
in vec4 instanceColors;
in vec3 instancePickingColors;
in vec3 instanceModelMatrixCol0;
in vec3 instanceModelMatrixCol1;
in vec3 instanceModelMatrixCol2;
in vec3 instanceTranslation;

// Primitive attributes
in vec3 positions;
#ifdef HAS_UV
  in vec2 texCoords;
#endif
#ifdef LIGHTING_PBR
  #ifdef HAS_NORMALS
    in vec3 normals;
  #endif
#endif

// Varying
out vec4 vColor;

// pbrMaterial contains all the varying definitions needed
#ifndef LIGHTING_PBR
  #ifdef HAS_UV
    out vec2 vTEXCOORD_0;
  #endif
#endif

// Main
void main(void) {
  #if defined(HAS_UV) && !defined(LIGHTING_PBR)
    vTEXCOORD_0 = texCoords;
    geometry.uv = texCoords;
  #endif

  geometry.worldPosition = instancePositions;
  geometry.pickingColor = instancePickingColors;

  mat3 instanceModelMatrix = mat3(instanceModelMatrixCol0, instanceModelMatrixCol1, instanceModelMatrixCol2);

  vec3 normal = vec3(0.0, 0.0, 1.0);
  #ifdef LIGHTING_PBR
    #ifdef HAS_NORMALS
      normal = instanceModelMatrix * (scenegraph.sceneModelMatrix * vec4(normals, 0.0)).xyz;
    #endif
  #endif

  float originalSize = project_size_to_pixel(scenegraph.sizeScale);
  float clampedSize = clamp(originalSize, scenegraph.sizeMinPixels, scenegraph.sizeMaxPixels);

  vec3 pos = (instanceModelMatrix * (scenegraph.sceneModelMatrix * vec4(positions, 1.0)).xyz) * scenegraph.sizeScale * (clampedSize / originalSize) + instanceTranslation;
  if(scenegraph.composeModelMatrix) {
    DECKGL_FILTER_SIZE(pos, geometry);
    // using instancePositions as world coordinates
    // when using globe mode, this branch does not re-orient the model to align with the surface of the earth
    // call project_normal before setting position to avoid rotation
    geometry.normal = project_normal(normal);
    geometry.worldPosition += pos;
    gl_Position = project_position_to_clipspace(pos + instancePositions, instancePositions64Low, vec3(0.0), geometry.position);
  }
  else {
    pos = project_size(pos);
    DECKGL_FILTER_SIZE(pos, geometry);
    gl_Position = project_position_to_clipspace(instancePositions, instancePositions64Low, pos, geometry.position);
    geometry.normal = project_normal(normal);
  }
  DECKGL_FILTER_GL_POSITION(gl_Position, geometry);

  #ifdef LIGHTING_PBR
    // set PBR data
    pbr_vPosition = geometry.position.xyz;
    #ifdef HAS_NORMALS
      pbr_vNormal = geometry.normal;
    #endif

    #ifdef HAS_UV
      pbr_vUV = texCoords;
    #else
      pbr_vUV = vec2(0., 0.);
    #endif
    geometry.uv = pbr_vUV;
  #endif

  vColor = instanceColors;
  DECKGL_FILTER_COLOR(vColor, geometry);
}
`;