dali-scene3d/internal/graphics/shaders/default-physically-based-shader.vert

   1 #version 300 es
   2
   3 // Original Code
   4 // https://github.com/KhronosGroup/glTF-Sample-Viewer/blob/glTF-WebGL-PBR/shaders/pbr-vert.glsl
   5 // Commit dc84b5e374fb3d23153d2248a338ef88173f9eb6
   6
   7 #define MORPH defined(MORPH_POSITION) || defined(MORPH_NORMAL) || defined(MORPH_TANGENT)
   8
   9 #ifdef HIGHP
  10   precision highp float;
  11 #else
  12   precision mediump float;
  13 #endif
  14
  15 in vec3 aPosition;
  16 in vec2 aTexCoord;
  17 in vec3 aNormal;
  18
  19 #ifdef VEC4_TANGENT
  20 in vec4 aTangent;
  21 #else
  22 in vec3 aTangent;
  23 #endif
  24
  25 in vec4 aVertexColor;
  26
  27 #ifdef MORPH
  28   uniform highp sampler2D sBlendShapeGeometry;
  29 #endif
  30
  31 out mediump vec2 vUV;
  32 out lowp mat3 vTBN;
  33 out lowp vec4 vColor;
  34 out highp vec3 vPositionToCamera;
  35
  36 uniform highp mat4 uViewMatrix;
  37 uniform mat3 uNormalMatrix;
  38 uniform mat4 uModelMatrix;
  39 uniform mat4 uProjection;
  40
  41 #ifdef SKINNING
  42   in vec4 aJoints;
  43   in vec4 aWeights;
  44   #define MAX_BONES 80
  45   uniform mat4 uBone[MAX_BONES];
  46   uniform mediump vec3 uYDirection;
  47 #endif
  48
  49 #ifdef MORPH
  50 #define MAX_BLEND_SHAPE_NUMBER 128
  51 uniform int uNumberOfBlendShapes;                                         ///< Total number of blend shapes loaded.
  52 uniform highp float uBlendShapeWeight[MAX_BLEND_SHAPE_NUMBER];            ///< The weight of each blend shape.
  53 #ifdef MORPH_VERSION_2_0
  54 uniform highp float uBlendShapeUnnormalizeFactor;                         ///< Factor used to unnormalize the geometry of the blend shape.
  55 #else
  56 uniform highp float uBlendShapeUnnormalizeFactor[MAX_BLEND_SHAPE_NUMBER]; ///< Factor used to unnormalize the geometry of the blend shape.
  57 #endif
  58 uniform highp int uBlendShapeComponentSize;                               ///< The size in the texture of either the vertices, normals or tangents. Used to calculate the offset to address them.
  59 #endif
  60
  61 void main()
  62 {
  63   highp vec4 position = vec4(aPosition, 1.0);
  64   highp vec3 normal = aNormal;
  65   highp vec3 tangent = aTangent.xyz;
  66
  67 #ifdef MORPH
  68   int width = textureSize( sBlendShapeGeometry, 0 ).x;
  69
  70   highp int blendShapeBufferOffset = 0;
  71
  72   for( int index = 0; index < uNumberOfBlendShapes; ++index )
  73   {
  74     highp vec3 diff = vec3(0.0);
  75     highp int vertexId = 0;
  76     highp int x = 0;
  77     highp int y = 0;
  78
  79 #ifdef MORPH_POSITION
  80     // Calculate the index to retrieve the geometry from the texture.
  81     vertexId = gl_VertexID + blendShapeBufferOffset;
  82     x = vertexId % width;
  83     y = vertexId / width;
  84
  85     // Retrieves the blend shape geometry from the texture, unnormalizes it and multiply by the weight.
  86     if( 0.0 != uBlendShapeWeight[index] )
  87     {
  88 #ifdef MORPH_VERSION_2_0
  89        highp float unnormalizeFactor = uBlendShapeUnnormalizeFactor;
  90 #else
  91        highp float unnormalizeFactor = uBlendShapeUnnormalizeFactor[index];
  92 #endif
  93
  94       diff = uBlendShapeWeight[index] * unnormalizeFactor * ( texelFetch( sBlendShapeGeometry, ivec2(x, y), 0 ).xyz - 0.5 );
  95     }
  96
  97     position.xyz += diff;
  98
  99     blendShapeBufferOffset += uBlendShapeComponentSize;
 100 #endif
 101
 102 #ifdef MORPH_NORMAL
 103     // Calculate the index to retrieve the normal from the texture.
 104     vertexId = gl_VertexID + blendShapeBufferOffset;
 105     x = vertexId % width;
 106     y = vertexId / width;
 107
 108     // Retrieves the blend shape normal from the texture, unnormalizes it and multiply by the weight.
 109     if( 0.0 != uBlendShapeWeight[index] )
 110     {
 111       diff = uBlendShapeWeight[index] * 2.0 * ( texelFetch( sBlendShapeGeometry, ivec2(x, y), 0 ).xyz - 0.5 );
 112     }
 113
 114     normal += diff.xyz;
 115
 116     blendShapeBufferOffset += uBlendShapeComponentSize;
 117 #endif
 118
 119 #ifdef MORPH_TANGENT
 120     // Calculate the index to retrieve the tangent from the texture.
 121     vertexId = gl_VertexID + blendShapeBufferOffset;
 122     x = vertexId % width;
 123     y = vertexId / width;
 124
 125     // Retrieves the blend shape tangent from the texture, unnormalizes it and multiply by the weight.
 126     if( 0.0 != uBlendShapeWeight[index] )
 127     {
 128       diff = uBlendShapeWeight[index] * 2.0 * ( texelFetch( sBlendShapeGeometry, ivec2(x, y), 0 ).xyz - 0.5 );
 129     }
 130
 131     tangent += diff.xyz;
 132
 133     blendShapeBufferOffset += uBlendShapeComponentSize;
 134 #endif
 135   }
 136
 137 #endif
 138
 139 #ifdef SKINNING
 140   highp mat4 bone = uBone[int(aJoints.x)] * aWeights.x +
 141     uBone[int(aJoints.y)] * aWeights.y +
 142     uBone[int(aJoints.z)] * aWeights.z +
 143     uBone[int(aJoints.w)] * aWeights.w;
 144   position = bone * position;
 145   normal = uYDirection * (bone * vec4(normal, 0.0)).xyz;
 146   tangent = uYDirection * (bone * vec4(tangent, 0.0)).xyz;
 147
 148   highp vec4 positionW = position;
 149 #else
 150   highp vec4 positionW = uModelMatrix * position;
 151 #endif
 152   highp vec4 positionV = uViewMatrix * positionW;
 153
 154   vPositionToCamera = transpose(mat3(uViewMatrix)) * -vec3(positionV.xyz / positionV.w);
 155
 156   normal = normalize(normal);
 157   tangent = normalize(tangent);
 158   vec3 bitangent = cross(normal, tangent);
 159 #ifdef VEC4_TANGENT
 160   bitangent *= aTangent.w;
 161 #endif
 162   vTBN = mat3(uModelMatrix) * mat3(tangent, bitangent, normal);
 163
 164 #ifdef FLIP_V
 165   vUV = vec2(aTexCoord.x, 1.0 - aTexCoord.y);
 166 #else
 167   vUV = aTexCoord;
 168 #endif
 169
 170   vColor = aVertexColor;
 171
 172   gl_Position = uProjection * positionV;
 173 }