demo/render-webgl.js

goog.provide('RenderWebGL');

/**
 * @constructor
 * @param {WebGLRenderingContext} gl
 */
RenderWebGL = function(gl) {
  var render = this;
  render.gl = gl;
  if (!gl) {
    return;
  }
  render.bone_info_map = {};
  render.skin_info_map = {};
  render.gl_textures = {};
  render.gl_projection = mat4x4Identity(new Float32Array(16));
  render.gl_modelview = mat3x3Identity(new Float32Array(9));
  render.gl_tex_matrix = mat3x3Identity(new Float32Array(9));
  render.gl_color = vec4Identity(new Float32Array(4));
  var gl_mesh_shader_vs_src = [
    "precision mediump int;",
    "precision mediump float;",
    "uniform mat4 uProjection;",
    "uniform mat3 uModelview;",
    "uniform mat3 uTexMatrix;",
    "attribute vec2 aVertexPosition;", // [ x, y ]
    "attribute vec2 aVertexTexCoord;", // [ u, v ]
    "varying vec3 vTexCoord;",
    "void main(void) {",
    " vTexCoord = uTexMatrix * vec3(aVertexTexCoord, 1.0);",
    " gl_Position = uProjection * vec4(uModelview * vec3(aVertexPosition, 1.0), 1.0);",
    "}"
  ];
  var gl_ffd_mesh_shader_vs_src = [
    "precision mediump int;",
    "precision mediump float;",
    "uniform mat4 uProjection;",
    "uniform mat3 uModelview;",
    "uniform mat3 uTexMatrix;",
    "uniform float uMorphWeight;",
    "attribute vec2 aVertexPosition;", // [ x, y ]
    "attribute vec2 aVertexTexCoord;", // [ u, v ]
    "attribute vec2 aVertexMorph0Position;", // [ dx, dy ]
    "attribute vec2 aVertexMorph1Position;", // [ dx, dy ]
    "varying vec3 vTexCoord;",
    "void main(void) {",
    " vTexCoord = uTexMatrix * vec3(aVertexTexCoord, 1.0);",
    " gl_Position = uProjection * vec4(uModelview * vec3(aVertexPosition + mix(aVertexMorph0Position, aVertexMorph1Position, uMorphWeight), 1.0), 1.0);",
    "}"
  ];
  var gl_mesh_shader_fs_src = [
    "precision mediump int;",
    "precision mediump float;",
    "uniform sampler2D uSampler;",
    "uniform vec4 uColor;",
    "varying vec3 vTexCoord;",
    "void main(void) {",
    " gl_FragColor = uColor * texture2D(uSampler, vTexCoord.st);",
    "}"
  ];
  render.gl_mesh_shader = glMakeShader(gl, gl_mesh_shader_vs_src, gl_mesh_shader_fs_src);
  render.gl_ffd_mesh_shader = glMakeShader(gl, gl_ffd_mesh_shader_vs_src, gl_mesh_shader_fs_src);
  render.gl_region_vertex = {};
  render.gl_region_vertex.position = glMakeVertex(gl, new Float32Array([-1, -1, 1, -1, 1, 1, -1, 1]), 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW); // [ x, y ]
  render.gl_region_vertex.texcoord = glMakeVertex(gl, new Float32Array([0, 1, 1, 1, 1, 0, 0, 0]), 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW); // [ u, v ]
  render.gl_skin_shader_modelview_count = 16; // * mat3
  render.gl_skin_shader_modelview_array = new Float32Array(9 * render.gl_skin_shader_modelview_count);
  render.gl_skin_shader_blenders_count = 8; // * vec2
  function repeat(format, count) {
    var array = [];
    for (var index = 0; index < count; ++index) {
      array.push(format.replace(/{index}/g, index));
    }
    return array;
  }
  var gl_skin_shader_vs_src = [
    "precision mediump int;",
    "precision mediump float;",
    "uniform mat4 uProjection;",
    "uniform mat3 uModelviewArray[" + render.gl_skin_shader_modelview_count + "];",
    "uniform mat3 uTexMatrix;",
    "attribute vec2 aVertexPosition;", // [ x, y ]
    repeat("attribute vec2 aVertexBlenders{index};", render.gl_skin_shader_blenders_count), // [ i, w ]
    "attribute vec2 aVertexTexCoord;", // [ u, v ]
    "varying vec3 vTexCoord;",
    "void main(void) {",
    " vTexCoord = uTexMatrix * vec3(aVertexTexCoord, 1.0);",
    " vec3 position = vec3(aVertexPosition, 1.0);",
    " vec3 blendPosition = vec3(0.0);",
    repeat(" blendPosition += (uModelviewArray[int(aVertexBlenders{index}.x)] * position) * aVertexBlenders{index}.y;", render.gl_skin_shader_blenders_count),
    " gl_Position = uProjection * vec4(blendPosition, 1.0);",
    "}"
  ];
  var gl_ffd_skin_shader_vs_src = [
    "precision mediump int;",
    "precision mediump float;",
    "uniform mat4 uProjection;",
    "uniform mat3 uModelviewArray[" + render.gl_skin_shader_modelview_count + "];",
    "uniform mat3 uTexMatrix;",
    "uniform float uMorphWeight;",
    "attribute vec2 aVertexPosition;", // [ x, y ]
    repeat("attribute vec2 aVertexBlenders{index};", render.gl_skin_shader_blenders_count), // [ i, w ]
    "attribute vec2 aVertexTexCoord;", // [ u, v ]
    "attribute vec2 aVertexMorph0Position;", // [ dx, dy ]
    "attribute vec2 aVertexMorph1Position;", // [ dx, dy ]
    "varying vec3 vTexCoord;",
    "void main(void) {",
    " vTexCoord = uTexMatrix * vec3(aVertexTexCoord, 1.0);",
    " vec3 position = vec3(aVertexPosition + mix(aVertexMorph0Position, aVertexMorph1Position, uMorphWeight), 1.0);",
    " vec3 blendPosition = vec3(0.0);",
    repeat(" blendPosition += (uModelviewArray[int(aVertexBlenders{index}.x)] * position) * aVertexBlenders{index}.y;", render.gl_skin_shader_blenders_count),
    " gl_Position = uProjection * vec4(blendPosition, 1.0);",
    "}"
  ];
  var gl_skin_shader_fs_src = [
    "precision mediump int;",
    "precision mediump float;",
    "uniform sampler2D uSampler;",
    "uniform vec4 uColor;",
    "varying vec3 vTexCoord;",
    "void main(void) {",
    " gl_FragColor = uColor * texture2D(uSampler, vTexCoord.st);",
    "}"
  ];
  render.gl_skin_shader = glMakeShader(gl, gl_skin_shader_vs_src, gl_skin_shader_fs_src);
  render.gl_ffd_skin_shader = glMakeShader(gl, gl_ffd_skin_shader_vs_src, gl_skin_shader_fs_src);
}

/**
 * @return {void}
 * @param {spine.Data} spine_data
 * @param {atlas.Data} atlas_data
 */
RenderWebGL.prototype.dropData = function(spine_data, atlas_data) {
  var render = this;
  var gl = render.gl;
  if (!gl) {
    return;
  }

  Object.keys(render.gl_textures).forEach(function(image_key) {
    var gl_texture = render.gl_textures[image_key];
    gl.deleteTexture(gl_texture);
    gl_texture = null;
    delete render.gl_textures[image_key];
  });

  render.gl_textures = {};

  Object.keys(render.bone_info_map).forEach(function(bone_key) {
    var bone_info = render.bone_info_map[bone_key];
  });

  render.bone_info_map = {};

  Object.keys(render.skin_info_map).forEach(function(skin_key) {
    var skin_info = render.skin_info_map[skin_key];
    var slot_info_map = skin_info.slot_info_map;
    Object.keys(slot_info_map).forEach(function(slot_key) {
      var slot_info = slot_info_map[slot_key];
      var attachment_info_map = slot_info.attachment_info_map;
      Object.keys(attachment_info_map).forEach(function(attachment_key) {
        var attachment_info = attachment_info_map[attachment_key];

        switch (attachment_info.type) {
          case 'mesh':
            var gl_vertex = attachment_info.gl_vertex;
            gl.deleteBuffer(gl_vertex.position.buffer);
            gl.deleteBuffer(gl_vertex.texcoord.buffer);
            gl.deleteBuffer(gl_vertex.triangle.buffer);
            Object.keys(attachment_info.anim_ffd_attachments).forEach(function(anim_key) {
              var anim_ffd_attachment = attachment_info.anim_ffd_attachments[anim_key];
              anim_ffd_attachment.ffd_keyframes.forEach(function(ffd_keyframe) {
                gl.deleteBuffer(ffd_keyframe.gl_vertex.buffer);
              });
            });
            break;
          case 'weightedmesh':
            var gl_vertex = attachment_info.gl_vertex;
            gl.deleteBuffer(gl_vertex.position.buffer);
            gl.deleteBuffer(gl_vertex.blenders.buffer);
            gl.deleteBuffer(gl_vertex.texcoord.buffer);
            gl.deleteBuffer(gl_vertex.triangle.buffer);
            Object.keys(attachment_info.anim_ffd_attachments).forEach(function(anim_key) {
              var anim_ffd_attachment = attachment_info.anim_ffd_attachments[anim_key];
              anim_ffd_attachment.ffd_keyframes.forEach(function(ffd_keyframe) {
                gl.deleteBuffer(ffd_keyframe.gl_vertex.buffer);
              });
            });
            break;
          default:
            console.log("TODO", skin_key, slot_key, attachment_key, attachment_info.type);
            break;
        }
      });
    });
  });

  render.skin_info_map = {};
}

/**
 * @return {void}
 * @param {spine.Data} spine_data
 * @param {atlas.Data} atlas_data
 * @param {Object.<string,HTMLImageElement>} images
 */
RenderWebGL.prototype.loadData = function(spine_data, atlas_data, images) {
  var render = this;
  var gl = render.gl;
  if (!gl) {
    return;
  }

  spine_data.iterateBones(function(bone_key, bone) {
    var bone_info = render.bone_info_map[bone_key] = {};
    bone_info.setup_space = spine.Space.invert(bone.world_space, new spine.Space());
  });

  spine_data.iterateSkins(function(skin_key, skin) {
    var skin_info = render.skin_info_map[skin_key] = {};
    var slot_info_map = skin_info.slot_info_map = {};

    skin.iterateAttachments(function(slot_key, skin_slot, attachment_key, attachment) {
      if (!attachment) {
        return;
      }

      switch (attachment.type) {
        case 'mesh':
          var slot_info = slot_info_map[slot_key] = slot_info_map[slot_key] || {};
          var attachment_info_map = slot_info.attachment_info_map = slot_info.attachment_info_map || {};
          var attachment_info = attachment_info_map[attachment_key] = {};
          attachment_info.type = attachment.type;
          var vertex_count = attachment.vertices.length / 2;
          var vertex_position = new Float32Array(attachment.vertices);
          var vertex_texcoord = new Float32Array(attachment.uvs);
          var vertex_triangle = new Uint16Array(attachment.triangles);
          var gl_vertex = attachment_info.gl_vertex = {};
          gl_vertex.position = glMakeVertex(gl, vertex_position, 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW);
          gl_vertex.texcoord = glMakeVertex(gl, vertex_texcoord, 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW);
          gl_vertex.triangle = glMakeVertex(gl, vertex_triangle, 1, gl.ELEMENT_ARRAY_BUFFER, gl.STATIC_DRAW);
          var anim_ffd_attachments = attachment_info.anim_ffd_attachments = {};
          spine_data.iterateAnims(function(anim_key, anim) {
            var anim_ffd = anim.ffds && anim.ffds[skin_key];
            var ffd_slot = anim_ffd && anim_ffd.ffd_slots[slot_key];
            var ffd_attachment = ffd_slot && ffd_slot.ffd_attachments[attachment_key];
            if (ffd_attachment) {
              var anim_ffd_attachment = anim_ffd_attachments[anim_key] = {};
              var anim_ffd_keyframes = anim_ffd_attachment.ffd_keyframes = [];
              ffd_attachment.ffd_keyframes.forEach(function(ffd_keyframe, ffd_keyframe_index) {
                var anim_ffd_keyframe = anim_ffd_keyframes[ffd_keyframe_index] = {};
                var vertex = new Float32Array(2 * vertex_count);
                vertex.subarray(ffd_keyframe.offset, ffd_keyframe.offset + ffd_keyframe.vertices.length).set(new Float32Array(ffd_keyframe.vertices));
                anim_ffd_keyframe.gl_vertex = glMakeVertex(gl, vertex, 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW);
              });
            }
          });
          break;
        case 'weightedmesh':
          var slot_info = slot_info_map[slot_key] = slot_info_map[slot_key] || {};
          var attachment_info_map = slot_info.attachment_info_map = slot_info.attachment_info_map || {};
          var attachment_info = attachment_info_map[attachment_key] = {};
          attachment_info.type = attachment.type;
          var vertex_count = attachment.uvs.length / 2;
          var vertex_position = new Float32Array(2 * vertex_count); // [ x, y ]
          var vertex_blenders = new Float32Array(2 * render.gl_skin_shader_blenders_count * vertex_count); // [ i, w ]
          var vertex_texcoord = new Float32Array(attachment.uvs);
          var vertex_triangle = new Uint16Array(attachment.triangles);
          var blend_bone_index_array = attachment_info.blend_bone_index_array = [];
          for (var vertex_index = 0, index = 0; vertex_index < vertex_count; ++vertex_index) {
            var blender_count = attachment.vertices[index++];
            var blender_array = [];
            for (var blender_index = 0; blender_index < blender_count; ++blender_index) {
              var bone_index = attachment.vertices[index++];
              var x = attachment.vertices[index++];
              var y = attachment.vertices[index++];
              var weight = attachment.vertices[index++];
              blender_array.push({
                position: new spine.Vector(x, y),
                bone_index: bone_index,
                weight: weight
              });
            }

            // sort the blender array descending by weight
            blender_array.sort(function(a, b) {
              return b.weight - a.weight;
            });

            // clamp blender array and adjust weights
            if (blender_array.length > render.gl_skin_shader_blenders_count) {
              console.log("blend array length for", attachment_key, "is", blender_array.length, "so clamp to", render.gl_skin_shader_blenders_count);
              blender_array.length = render.gl_skin_shader_blenders_count;
            }

            var weight_sum = 0;
            blender_array.forEach(function(blend) {
              weight_sum += blend.weight;
            });
            blender_array.forEach(function(blend) {
              blend.weight /= weight_sum;
            });

            var position_x = 0;
            var position_y = 0;
            var blend_position = new spine.Vector();
            var vertex_blenders_offset = vertex_index * 2 * render.gl_skin_shader_blenders_count;
            blender_array.forEach(function(blend, index) {
              // keep track of which bones are used for blending
              if (blend_bone_index_array.indexOf(blend.bone_index) === -1) {
                blend_bone_index_array.push(blend.bone_index);
              }
              var bone_key = spine_data.bone_keys[blend.bone_index];
              var bone = spine_data.bones[bone_key];
              spine.Space.transform(bone.world_space, blend.position, blend_position);
              position_x += blend_position.x * blend.weight;
              position_y += blend_position.y * blend.weight;
              // index into gl_skin_shader_modelview_array, not spine_pose.data.bone_keys
              vertex_blenders[vertex_blenders_offset++] = blend_bone_index_array.indexOf(blend.bone_index);
              vertex_blenders[vertex_blenders_offset++] = blend.weight;
            });
            var vertex_position_offset = vertex_index * 2;
            vertex_position[vertex_position_offset++] = position_x;
            vertex_position[vertex_position_offset++] = position_y;

            if (blend_bone_index_array.length > render.gl_skin_shader_modelview_count) {
              console.log("blend bone index array length for", attachment_key, "is", blend_bone_index_array.length, "greater than", render.gl_skin_shader_modelview_count);
            }
          }
          var gl_vertex = attachment_info.gl_vertex = {};
          gl_vertex.position = glMakeVertex(gl, vertex_position, 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW);
          gl_vertex.blenders = glMakeVertex(gl, vertex_blenders, 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW);
          gl_vertex.texcoord = glMakeVertex(gl, vertex_texcoord, 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW);
          gl_vertex.triangle = glMakeVertex(gl, vertex_triangle, 1, gl.ELEMENT_ARRAY_BUFFER, gl.STATIC_DRAW);
          var anim_ffd_attachments = attachment_info.anim_ffd_attachments = {};
          spine_data.iterateAnims(function(anim_key, anim) {
            var anim_ffd = anim.ffds && anim.ffds[skin_key];
            var ffd_slot = anim_ffd && anim_ffd.ffd_slots[slot_key];
            var ffd_attachment = ffd_slot && ffd_slot.ffd_attachments[attachment_key];
            if (ffd_attachment) {
              var anim_ffd_attachment = anim_ffd_attachments[anim_key] = {};
              var anim_ffd_keyframes = anim_ffd_attachment.ffd_keyframes = [];
              ffd_attachment.ffd_keyframes.forEach(function(ffd_keyframe, ffd_keyframe_index) {
                var anim_ffd_keyframe = anim_ffd_keyframes[ffd_keyframe_index] = {};
                var vertex = new Float32Array(2 * vertex_count);
                for (var vertex_index = 0, index = 0, ffd_index = 0; vertex_index < vertex_count; ++vertex_index) {
                  var blender_count = attachment.vertices[index++];
                  var vertex_x = 0;
                  var vertex_y = 0;
                  for (var blender_index = 0; blender_index < blender_count; ++blender_index) {
                    var bone_index = attachment.vertices[index++];
                    var x = attachment.vertices[index++];
                    var y = attachment.vertices[index++];
                    var weight = attachment.vertices[index++];
                    var morph_position_x = ffd_keyframe.vertices[ffd_index - ffd_keyframe.offset] || 0;
                    ++ffd_index;
                    var morph_position_y = ffd_keyframe.vertices[ffd_index - ffd_keyframe.offset] || 0;
                    ++ffd_index;
                    vertex_x += morph_position_x * weight;
                    vertex_y += morph_position_y * weight;
                  }
                  var vertex_offset = vertex_index * 2;
                  vertex[vertex_offset++] = vertex_x;
                  vertex[vertex_offset++] = vertex_y;
                }
                anim_ffd_keyframe.gl_vertex = glMakeVertex(gl, vertex, 2, gl.ARRAY_BUFFER, gl.STATIC_DRAW);
              });
            }
          });
          break;
      }
    });
  });

  if (atlas_data) {
    // load atlas page images
    atlas_data.pages.forEach(function(page) {
      if (page.format !== 'RGBA8888') {
        throw new Error(page.format);
      }

      var gl_min_filter = gl.NONE;
      switch (page.min_filter) {
        case 'Nearest':
          gl_min_filter = gl.NEAREST;
          break;
        default:
        case 'Linear':
          gl_min_filter = gl.LINEAR;
          break;
        case 'MipMapNearestNearest':
          gl_min_filter = gl.NEAREST_MIPMAP_NEAREST;
          break;
        case 'MipMapLinearNearest':
          gl_min_filter = gl.LINEAR_MIPMAP_NEAREST;
          break;
        case 'MipMapNearestLinear':
          gl_min_filter = gl.NEAREST_MIPMAP_LINEAR;
          break;
        case 'MipMapLinearLinear':
          gl_min_filter = gl.LINEAR_MIPMAP_LINEAR;
          break;
      }

      var gl_mag_filter = gl.NONE;
      switch (page.mag_filter) {
        case 'Nearest':
          gl_mag_filter = gl.NEAREST;
          break;
        default:
        case 'Linear':
          gl_mag_filter = gl.LINEAR;
          break;
      }

      var gl_wrap_s = gl.NONE;
      switch (page.wrap_s) {
        case 'Repeat':
          gl_wrap_s = gl.REPEAT;
          break;
        default:
        case 'ClampToEdge':
          gl_wrap_s = gl.CLAMP_TO_EDGE;
          break;
        case 'MirroredRepeat':
          gl_wrap_s = gl.MIRRORED_REPEAT;
          break;
      }

      var gl_wrap_t = gl.NONE;
      switch (page.wrap_t) {
        case 'Repeat':
          gl_wrap_t = gl.REPEAT;
          break;
        default:
        case 'ClampToEdge':
          gl_wrap_t = gl.CLAMP_TO_EDGE;
          break;
        case 'MirroredRepeat':
          gl_wrap_t = gl.MIRRORED_REPEAT;
          break;
      }

      var image_key = page.name;
      var image = images[image_key];
      var gl_texture = render.gl_textures[image_key] = gl.createTexture();
      gl.bindTexture(gl.TEXTURE_2D, gl_texture);
      gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl_min_filter);
      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl_mag_filter);
      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl_wrap_s);
      gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl_wrap_t);
    });
  } else {
    // load attachment images
    spine_data.iterateSkins(function(skin_key, skin) {
      skin.iterateAttachments(function(slot_key, skin_slot, attachment_key, attachment) {
        if (!attachment) {
          return;
        }

        switch (attachment.type) {
          case 'region':
          case 'mesh':
          case 'weightedmesh':
            var image_key = attachment_key;
            var image = images[image_key];
            var gl_texture = render.gl_textures[image_key] = gl.createTexture();
            gl.bindTexture(gl.TEXTURE_2D, gl_texture);
            gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
            break;
        }
      });
    });
  }
}

/**
 * @return {void}
 * @param {spine.Pose} spine_pose
 * @param {atlas.Data} atlas_data
 */
RenderWebGL.prototype.drawPose = function(spine_pose, atlas_data) {
  var render = this;
  var gl = render.gl;
  if (!gl) {
    return;
  }

  var gl_projection = render.gl_projection;
  var gl_modelview = render.gl_modelview;
  var gl_tex_matrix = render.gl_tex_matrix;
  var gl_color = render.gl_color;

  var alpha = gl_color[3];

  spine_pose.iterateAttachments(function(slot_key, slot, skin_slot, attachment_key, attachment) {
    if (!attachment) {
      return;
    }
    if (attachment.type === 'boundingbox') {
      return;
    }

    var site = atlas_data && atlas_data.sites[attachment_key];
    var page = site && site.page;
    var image_key = (page && page.name) || attachment_key;
    var gl_texture = render.gl_textures[image_key];

    if (!gl_texture) {
      return;
    }

    mat3x3Identity(gl_modelview);
    mat3x3Identity(gl_tex_matrix);
    mat3x3ApplyAtlasPageTexcoord(gl_tex_matrix, page);
    mat3x3ApplyAtlasSiteTexcoord(gl_tex_matrix, site);

    vec4CopyColor(gl_color, slot.color);
    gl_color[3] *= alpha;

    gl.enable(gl.BLEND);
    switch (slot.blend) {
      default:
      case 'normal':
        gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
        break;
      case 'additive':
        gl.blendFunc(gl.SRC_ALPHA, gl.ONE);
        break;
      case 'multiply':
        gl.blendFunc(gl.DST_COLOR, gl.ONE_MINUS_SRC_ALPHA);
        break;
      case 'screen':
        gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_COLOR);
        break;
    }

    switch (attachment.type) {
      case 'region':
        var bone = spine_pose.bones[slot.bone_key];
        mat3x3ApplySpace(gl_modelview, bone.world_space);
        mat3x3ApplySpace(gl_modelview, attachment.local_space);
        mat3x3Scale(gl_modelview, attachment.width / 2, attachment.height / 2);
        mat3x3ApplyAtlasSitePosition(gl_modelview, site);
        vec4ApplyColor(gl_color, attachment.color);

        var gl_shader = render.gl_mesh_shader;
        var gl_vertex = render.gl_region_vertex;

        gl.useProgram(gl_shader.program);

        gl.uniformMatrix4fv(gl_shader.uniforms['uProjection'], false, gl_projection);
        gl.uniformMatrix3fv(gl_shader.uniforms['uModelview'], false, gl_modelview);
        gl.uniformMatrix3fv(gl_shader.uniforms['uTexMatrix'], false, gl_tex_matrix);
        gl.uniform4fv(gl_shader.uniforms['uColor'], gl_color);

        gl.activeTexture(gl.TEXTURE0);
        gl.bindTexture(gl.TEXTURE_2D, gl_texture);
        gl.uniform1i(gl_shader.uniforms['uSampler'], 0);

        glSetupAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
        glSetupAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

        gl.drawArrays(gl.TRIANGLE_FAN, 0, gl_vertex.position.count);

        glResetAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
        glResetAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

        gl.bindTexture(gl.TEXTURE_2D, null);

        gl.useProgram(null);
        break;
      case 'mesh':
        var skin_info = render.skin_info_map[spine_pose.skin_key],
          default_skin_info = render.skin_info_map['default'];
        var slot_info = skin_info.slot_info_map[slot_key] || default_skin_info.slot_info_map[slot_key];
        var attachment_info = slot_info.attachment_info_map[attachment_key];
        var bone = spine_pose.bones[slot.bone_key];
        mat3x3ApplySpace(gl_modelview, bone.world_space);
        mat3x3ApplyAtlasSitePosition(gl_modelview, site);
        vec4ApplyColor(gl_color, attachment.color);

        var anim = spine_pose.data.anims[spine_pose.anim_key];
        var anim_ffd = anim && anim.ffds && anim.ffds[spine_pose.skin_key];
        var ffd_slot = anim_ffd && anim_ffd.ffd_slots[slot_key];
        var ffd_attachment = ffd_slot && ffd_slot.ffd_attachments[attachment_key];
        var ffd_keyframes = ffd_attachment && ffd_attachment.ffd_keyframes;
        var ffd_keyframe0_index = spine.Keyframe.find(ffd_keyframes, spine_pose.time);
        if (ffd_keyframe0_index !== -1) {
          // ffd

          var pct = 0;
          var ffd_keyframe0 = ffd_keyframes[ffd_keyframe0_index];
          var ffd_keyframe1_index = ffd_keyframe0_index + 1;
          var ffd_keyframe1 = ffd_keyframes[ffd_keyframe1_index];
          if (ffd_keyframe1) {
            pct = ffd_keyframe0.curve.evaluate((spine_pose.time - ffd_keyframe0.time) / (ffd_keyframe1.time - ffd_keyframe0.time));
          } else {
            ffd_keyframe1_index = ffd_keyframe0_index;
            ffd_keyframe1 = ffd_keyframes[ffd_keyframe1_index];
          }

          var anim_ffd_attachment = attachment_info.anim_ffd_attachments[spine_pose.anim_key];
          var anim_ffd_keyframe0 = anim_ffd_attachment.ffd_keyframes[ffd_keyframe0_index];
          var anim_ffd_keyframe1 = anim_ffd_attachment.ffd_keyframes[ffd_keyframe1_index];

          var gl_shader = render.gl_ffd_mesh_shader;
          var gl_vertex = attachment_info.gl_vertex;

          gl.useProgram(gl_shader.program);

          gl.uniformMatrix4fv(gl_shader.uniforms['uProjection'], false, gl_projection);
          gl.uniformMatrix3fv(gl_shader.uniforms['uModelview'], false, gl_modelview);
          gl.uniformMatrix3fv(gl_shader.uniforms['uTexMatrix'], false, gl_tex_matrix);
          gl.uniform4fv(gl_shader.uniforms['uColor'], gl_color);
          gl.uniform1f(gl_shader.uniforms['uMorphWeight'], pct);

          gl.activeTexture(gl.TEXTURE0);
          gl.bindTexture(gl.TEXTURE_2D, gl_texture);
          gl.uniform1i(gl_shader.uniforms['uSampler'], 0);

          glSetupAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
          glSetupAttribute(gl, gl_shader, 'aVertexMorph0Position', anim_ffd_keyframe0.gl_vertex);
          glSetupAttribute(gl, gl_shader, 'aVertexMorph1Position', anim_ffd_keyframe1.gl_vertex);
          glSetupAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

          gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl_vertex.triangle.buffer);
          gl.drawElements(gl.TRIANGLES, gl_vertex.triangle.count, gl_vertex.triangle.type, 0);
          gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);

          glResetAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
          glResetAttribute(gl, gl_shader, 'aVertexMorph0Position', anim_ffd_keyframe0.gl_vertex);
          glResetAttribute(gl, gl_shader, 'aVertexMorph1Position', anim_ffd_keyframe1.gl_vertex);
          glResetAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

          gl.bindTexture(gl.TEXTURE_2D, null);

          gl.useProgram(null);
        } else {
          // no ffd

          var gl_shader = render.gl_mesh_shader;
          var gl_vertex = attachment_info.gl_vertex;

          gl.useProgram(gl_shader.program);

          gl.uniformMatrix4fv(gl_shader.uniforms['uProjection'], false, gl_projection);
          gl.uniformMatrix3fv(gl_shader.uniforms['uModelview'], false, gl_modelview);
          gl.uniformMatrix3fv(gl_shader.uniforms['uTexMatrix'], false, gl_tex_matrix);
          gl.uniform4fv(gl_shader.uniforms['uColor'], gl_color);

          gl.activeTexture(gl.TEXTURE0);
          gl.bindTexture(gl.TEXTURE_2D, gl_texture);
          gl.uniform1i(gl_shader.uniforms['uSampler'], 0);

          glSetupAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
          glSetupAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

          gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl_vertex.triangle.buffer);
          gl.drawElements(gl.TRIANGLES, gl_vertex.triangle.count, gl_vertex.triangle.type, 0);
          gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);

          glResetAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
          glResetAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

          gl.bindTexture(gl.TEXTURE_2D, null);

          gl.useProgram(null);
        }
        break;
      case 'weightedmesh':
        var skin_info = render.skin_info_map[spine_pose.skin_key],
          default_skin_info = render.skin_info_map['default'];
        var slot_info = skin_info.slot_info_map[slot_key] || default_skin_info.slot_info_map[slot_key];
        var attachment_info = slot_info.attachment_info_map[attachment_key];
        // update skin shader modelview array
        var blend_bone_index_array = attachment_info.blend_bone_index_array;
        for (var index = 0; index < blend_bone_index_array.length; ++index) {
          var bone_index = blend_bone_index_array[index];
          var bone_key = spine_pose.bone_keys[bone_index];
          var bone = spine_pose.bones[bone_key];
          var bone_info = render.bone_info_map[bone_key];
          if (index < render.gl_skin_shader_modelview_count) {
            var modelview = render.gl_skin_shader_modelview_array.subarray(index * 9, (index + 1) * 9);
            mat3x3Copy(modelview, gl_modelview);
            mat3x3ApplySpace(modelview, bone.world_space);
            mat3x3ApplySpace(modelview, bone_info.setup_space);
            mat3x3ApplyAtlasSitePosition(modelview, site);
          }
        }
        vec4ApplyColor(gl_color, attachment.color);

        var anim = spine_pose.data.anims[spine_pose.anim_key];
        var anim_ffd = anim && anim.ffds && anim.ffds[spine_pose.skin_key];
        var ffd_slot = anim_ffd && anim_ffd.ffd_slots[slot_key];
        var ffd_attachment = ffd_slot && ffd_slot.ffd_attachments[attachment_key];
        var ffd_keyframes = ffd_attachment && ffd_attachment.ffd_keyframes;
        var ffd_keyframe0_index = spine.Keyframe.find(ffd_keyframes, spine_pose.time);
        if (ffd_keyframe0_index !== -1) {
          // ffd

          var pct = 0;
          var ffd_keyframe0 = ffd_keyframes[ffd_keyframe0_index];
          var ffd_keyframe1_index = ffd_keyframe0_index + 1;
          var ffd_keyframe1 = ffd_keyframes[ffd_keyframe1_index];
          if (ffd_keyframe1) {
            pct = ffd_keyframe0.curve.evaluate((spine_pose.time - ffd_keyframe0.time) / (ffd_keyframe1.time - ffd_keyframe0.time));
          } else {
            ffd_keyframe1_index = ffd_keyframe0_index;
            ffd_keyframe1 = ffd_keyframes[ffd_keyframe1_index];
          }

          var anim_ffd_attachment = attachment_info.anim_ffd_attachments[spine_pose.anim_key];
          var anim_ffd_keyframe0 = anim_ffd_attachment.ffd_keyframes[ffd_keyframe0_index];
          var anim_ffd_keyframe1 = anim_ffd_attachment.ffd_keyframes[ffd_keyframe1_index];

          var gl_shader = render.gl_ffd_skin_shader;
          var gl_vertex = attachment_info.gl_vertex;

          gl.useProgram(gl_shader.program);

          gl.uniformMatrix4fv(gl_shader.uniforms['uProjection'], false, gl_projection);
          gl.uniformMatrix3fv(gl_shader.uniforms['uModelviewArray[0]'], false, render.gl_skin_shader_modelview_array);
          gl.uniformMatrix3fv(gl_shader.uniforms['uTexMatrix'], false, gl_tex_matrix);
          gl.uniform4fv(gl_shader.uniforms['uColor'], gl_color);
          gl.uniform1f(gl_shader.uniforms['uMorphWeight'], pct);

          gl.activeTexture(gl.TEXTURE0);
          gl.bindTexture(gl.TEXTURE_2D, gl_texture);
          gl.uniform1i(gl_shader.uniforms['uSampler'], 0);

          glSetupAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
          glSetupAttribute(gl, gl_shader, 'aVertexBlenders{index}', gl_vertex.blenders, render.gl_skin_shader_blenders_count);
          glSetupAttribute(gl, gl_shader, 'aVertexMorph0Position', anim_ffd_keyframe0.gl_vertex);
          glSetupAttribute(gl, gl_shader, 'aVertexMorph1Position', anim_ffd_keyframe1.gl_vertex);
          glSetupAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

          gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl_vertex.triangle.buffer);
          gl.drawElements(gl.TRIANGLES, gl_vertex.triangle.count, gl_vertex.triangle.type, 0);
          gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);

          glResetAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
          glResetAttribute(gl, gl_shader, 'aVertexBlenders{index}', gl_vertex.blenders, render.gl_skin_shader_blenders_count);
          glResetAttribute(gl, gl_shader, 'aVertexMorph0Position', anim_ffd_keyframe0.gl_vertex);
          glResetAttribute(gl, gl_shader, 'aVertexMorph1Position', anim_ffd_keyframe1.gl_vertex);
          glResetAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

          gl.bindTexture(gl.TEXTURE_2D, null);

          gl.useProgram(null);
        } else {
          // no ffd

          var gl_shader = render.gl_skin_shader;
          var gl_vertex = attachment_info.gl_vertex;

          gl.useProgram(gl_shader.program);

          gl.uniformMatrix4fv(gl_shader.uniforms['uProjection'], false, gl_projection);
          gl.uniformMatrix3fv(gl_shader.uniforms['uModelviewArray[0]'], false, render.gl_skin_shader_modelview_array);
          gl.uniformMatrix3fv(gl_shader.uniforms['uTexMatrix'], false, gl_tex_matrix);
          gl.uniform4fv(gl_shader.uniforms['uColor'], gl_color);

          gl.activeTexture(gl.TEXTURE0);
          gl.bindTexture(gl.TEXTURE_2D, gl_texture);
          gl.uniform1i(gl_shader.uniforms['uSampler'], 0);

          glSetupAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
          glSetupAttribute(gl, gl_shader, 'aVertexBlenders{index}', gl_vertex.blenders, render.gl_skin_shader_blenders_count);
          glSetupAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

          gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl_vertex.triangle.buffer);
          gl.drawElements(gl.TRIANGLES, gl_vertex.triangle.count, gl_vertex.triangle.type, 0);
          gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);

          glResetAttribute(gl, gl_shader, 'aVertexPosition', gl_vertex.position);
          glResetAttribute(gl, gl_shader, 'aVertexBlenders{index}', gl_vertex.blenders, render.gl_skin_shader_blenders_count);
          glResetAttribute(gl, gl_shader, 'aVertexTexCoord', gl_vertex.texcoord);

          gl.bindTexture(gl.TEXTURE_2D, null);

          gl.useProgram(null);
        }
        break;
    }
  });

  gl_color[3] = alpha;
}

function vec4Identity(v) {
  v[0] = v[1] = v[2] = v[3] = 1.0;
  return v;
}

function vec4CopyColor(v, color) {
  v[0] = color.r;
  v[1] = color.g;
  v[2] = color.b;
  v[3] = color.a;
  return v;
}

function vec4ApplyColor(v, color) {
  v[0] *= color.r;
  v[1] *= color.g;
  v[2] *= color.b;
  v[3] *= color.a;
  return v;
}

function mat3x3Identity(m) {
  m[1] = m[2] = m[3] =
  m[5] = m[6] = m[7] = 0.0;
  m[0] = m[4] = m[8] = 1.0;
  return m;
}

function mat3x3Copy(m, other) {
  m.set(other);
  return m;
}

function mat3x3Multiply2x2(m, a, b, c, d) {
  var a00 = m[0], a01 = m[1], a02 = m[2]; // col 0
  var a10 = m[3], a11 = m[4], a12 = m[5]; // col 1
  m[0] = a * a00 + c * a10;
  m[1] = a * a01 + c * a11;
  m[2] = a * a02 + c * a12;
  m[3] = b * a00 + d * a10;
  m[4] = b * a01 + d * a11;
  m[5] = b * a02 + d * a12;
  return m;
}

function mat3x3Ortho(m, l, r, b, t) {
  var lr = 1 / (l - r);
  var bt = 1 / (b - t);
  m[0] *= -2 * lr;
  m[4] *= -2 * bt;
  m[6] += (l + r) * lr;
  m[7] += (t + b) * bt;
  return m;
}

function mat3x3Translate(m, x, y) {
  m[6] += m[0] * x + m[3] * y;
  m[7] += m[1] * x + m[4] * y;
  return m;
}

function mat3x3RotateCosSin(m, c, s) {
  var m0 = m[0], m1 = m[1];
  var m3 = m[3], m4 = m[4];
  m[0] = m0 * c + m3 * s;
  m[1] = m1 * c + m4 * s;
  m[3] = m3 * c - m0 * s;
  m[4] = m4 * c - m1 * s;
  return m;
}

function mat3x3Rotate(m, angle) {
  return mat3x3RotateCosSin(m, Math.cos(angle), Math.sin(angle));
}

function mat3x3Scale(m, x, y) {
  m[0] *= x;
  m[1] *= x;
  m[2] *= x;
  m[3] *= y;
  m[4] *= y;
  m[5] *= y;
  return m;
}

function mat3x3Transform(m, v, out) {
  var x = m[0] * v[0] + m[3] * v[1] + m[6];
  var y = m[1] * v[0] + m[4] * v[1] + m[7];
  var w = m[2] * v[0] + m[5] * v[1] + m[8];
  var iw = (w) ? (1 / w) : (1);
  out[0] = x * iw;
  out[1] = y * iw;
  return out;
}

function mat3x3ApplySpace(m, space) {
  if (space) {
    mat3x3Translate(m, space.position.x, space.position.y);
    mat3x3RotateCosSin(m, space.rotation.cos, space.rotation.sin);
    mat3x3Multiply2x2(m, space.shear.x.cos, -space.shear.y.sin, space.shear.x.sin, space.shear.y.cos);
    mat3x3Multiply2x2(m, space.scale.a, space.scale.b, space.scale.c, space.scale.d);
  }
  return m;
}

function mat3x3ApplyAtlasPageTexcoord(m, page) {
  if (page) {
    mat3x3Scale(m, 1 / page.w, 1 / page.h);
  }
  return m;
}

function mat3x3ApplyAtlasSiteTexcoord(m, site) {
  if (site) {
    mat3x3Translate(m, site.x, site.y);
    if (site.rotate === -1) {
      mat3x3Translate(m, 0, site.w); // bottom-left corner
      mat3x3RotateCosSin(m, 0, -1); // -90 degrees
    } else if (site.rotate === 1) {
      mat3x3Translate(m, site.h, 0); // top-right corner
      mat3x3RotateCosSin(m, 0, 1); // 90 degrees
    }
    mat3x3Scale(m, site.w, site.h);
  }
  return m;
}

function mat3x3ApplyAtlasSitePosition(m, site) {
  if (site) {
    mat3x3Scale(m, 1 / site.original_w, 1 / site.original_h);
    mat3x3Translate(m, 2 * site.offset_x - (site.original_w - site.w), (site.original_h - site.h) - 2 * site.offset_y);
    mat3x3Scale(m, site.w, site.h);
  }
  return m;
}

function mat4x4Identity(m) {
  m[1] = m[2] = m[3] = m[4] =
  m[6] = m[7] = m[8] = m[9] =
  m[11] = m[12] = m[13] = m[14] = 0.0;
  m[0] = m[5] = m[10] = m[15] = 1.0;
  return m;
}

function mat4x4Copy(m, other) {
  m.set(other);
  return m;
}

function mat4x4Ortho(m, l, r, b, t, n, f) {
  var lr = 1 / (l - r);
  var bt = 1 / (b - t);
  var nf = 1 / (n - f);
  m[0] = -2 * lr;
  m[5] = -2 * bt;
  m[10] = 2 * nf;
  m[12] = (l + r) * lr;
  m[13] = (t + b) * bt;
  m[14] = (f + n) * nf;
  return m;
}

function mat4x4Translate(m, x, y, z) {
  z = z || 0;
  m[12] += m[0] * x + m[4] * y + m[8] * z;
  m[13] += m[1] * x + m[5] * y + m[9] * z;
  m[14] += m[2] * x + m[6] * y + m[10] * z;
  m[15] += m[3] * x + m[7] * y + m[11] * z;
  return m;
}

function mat4x4RotateCosSinZ(m, c, s) {
  var a_x = m[0],
    a_y = m[1],
    a_z = m[2],
    a_w = m[3];
  var b_x = m[4],
    b_y = m[5],
    b_z = m[6],
    b_w = m[7];
  m[0] = a_x * c + b_x * s;
  m[1] = a_y * c + b_y * s;
  m[2] = a_z * c + b_z * s;
  m[3] = a_w * c + b_w * s;
  m[4] = b_x * c - a_x * s;
  m[5] = b_y * c - a_y * s;
  m[6] = b_z * c - a_z * s;
  m[7] = b_w * c - a_w * s;
  return m;
}

function mat4x4RotateZ(m, angle) {
  return mat4x4RotateCosSinZ(m, Math.cos(angle), Math.sin(angle));
}

function mat4x4Scale(m, x, y, z) {
  z = z || 1;
  m[0] *= x;
  m[1] *= x;
  m[2] *= x;
  m[3] *= x;
  m[4] *= y;
  m[5] *= y;
  m[6] *= y;
  m[7] *= y;
  m[8] *= z;
  m[9] *= z;
  m[10] *= z;
  m[11] *= z;
  return m;
}

function glCompileShader(gl, src, type) {
  function flatten(array, out) {
    out = out || [];
    array.forEach(function(value) {
      if (Array.isArray(value)) {
        flatten(value, out);
      } else {
        out.push(value);
      }
    });
    return out;
  }
  src = flatten(src);
  var shader = gl.createShader(type);
  gl.shaderSource(shader, src.join('\n'));
  gl.compileShader(shader);
  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    src.forEach(function(line, index) {
      console.log(index + 1, line);
    });
    console.log(gl.getShaderInfoLog(shader));
    gl.deleteShader(shader);
    shader = null;
  }
  return shader;
}

function glLinkProgram(gl, vs, fs) {
  var program = gl.createProgram();
  gl.attachShader(program, vs);
  gl.attachShader(program, fs);
  gl.linkProgram(program);
  if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
    console.log("could not link shader program");
    gl.detachShader(program, vs);
    gl.detachShader(program, fs);
    gl.deleteProgram(program);
    program = null;
  }
  return program;
}

function glGetUniforms(gl, program, uniforms) {
  var count = /** @type {number} */ (gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS));
  for (var index = 0; index < count; ++index) {
    var uniform = gl.getActiveUniform(program, index);
    uniforms[uniform.name] = gl.getUniformLocation(program, uniform.name);
  }
  return uniforms;
}

function glGetAttribs(gl, program, attribs) {
  var count = /** @type {number} */ (gl.getProgramParameter(program, gl.ACTIVE_ATTRIBUTES));
  for (var index = 0; index < count; ++index) {
    var attrib = gl.getActiveAttrib(program, index);
    attribs[attrib.name] = gl.getAttribLocation(program, attrib.name);
  }
  return attribs;
}

function glMakeShader(gl, vs_src, fs_src) {
  var shader = {};
  shader.vs_src = vs_src;
  shader.fs_src = fs_src;
  shader.vs = glCompileShader(gl, shader.vs_src, gl.VERTEX_SHADER);
  shader.fs = glCompileShader(gl, shader.fs_src, gl.FRAGMENT_SHADER);
  shader.program = glLinkProgram(gl, shader.vs, shader.fs);
  shader.uniforms = glGetUniforms(gl, shader.program, {});
  shader.attribs = glGetAttribs(gl, shader.program, {});
  return shader;
}

function glMakeVertex(gl, type_array, size, buffer_type, buffer_draw) {
  var vertex = {};
  if (type_array instanceof Float32Array) {
    vertex.type = gl.FLOAT;
  } else if (type_array instanceof Int8Array) {
    vertex.type = gl.BYTE;
  } else if (type_array instanceof Uint8Array) {
    vertex.type = gl.UNSIGNED_BYTE;
  } else if (type_array instanceof Int16Array) {
    vertex.type = gl.SHORT;
  } else if (type_array instanceof Uint16Array) {
    vertex.type = gl.UNSIGNED_SHORT;
  } else if (type_array instanceof Int32Array) {
    vertex.type = gl.INT;
  } else if (type_array instanceof Uint32Array) {
    vertex.type = gl.UNSIGNED_INT;
  } else {
    vertex.type = gl.NONE;
    throw new Error();
  }
  vertex.size = size;
  vertex.count = type_array.length / vertex.size;
  vertex.type_array = type_array;
  vertex.buffer = gl.createBuffer();
  vertex.buffer_type = buffer_type;
  vertex.buffer_draw = buffer_draw;
  gl.bindBuffer(vertex.buffer_type, vertex.buffer);
  gl.bufferData(vertex.buffer_type, vertex.type_array, vertex.buffer_draw);
  return vertex;
}

function glSetupAttribute(gl, shader, format, vertex, count) {
  count = count || 0;
  gl.bindBuffer(vertex.buffer_type, vertex.buffer);
  if (count > 0) {
    var sizeof_vertex = vertex.type_array.BYTES_PER_ELEMENT * vertex.size; // in bytes
    var stride = sizeof_vertex * count;
    for (var index = 0; index < count; ++index) {
      var offset = sizeof_vertex * index;
      var attrib = shader.attribs[format.replace(/{index}/g, index)];
      gl.vertexAttribPointer(attrib, vertex.size, vertex.type, false, stride, offset);
      gl.enableVertexAttribArray(attrib);
    }
  } else {
    var attrib = shader.attribs[format];
    gl.vertexAttribPointer(attrib, vertex.size, vertex.type, false, 0, 0);
    gl.enableVertexAttribArray(attrib);
  }
}

function glResetAttribute(gl, shader, format, vertex, count) {
  count = count || 0;
  if (count > 0) {
    for (var index = 0; index < count; ++index) {
      var attrib = shader.attribs[format.replace(/{index}/g, index)];
      gl.disableVertexAttribArray(attrib);
    }
  } else {
    var attrib = shader.attribs[format];
    gl.disableVertexAttribArray(attrib);
  }
}