Load tangents from models;

src/data/modelData.c

@@ -273,6 +273,7 @@ ModelData* lovrModelDataCreate(Blob* blob) {
   bool hasNormals = false;
   bool hasUVs = false;
   bool hasVertexColors = false;
+  bool hasTangents = false;
   bool isSkinned = false;
 
   for (unsigned int m = 0; m < scene->mNumMeshes; m++) {
@@ -282,6 +283,7 @@ ModelData* lovrModelDataCreate(Blob* blob) {
     hasNormals |= assimpMesh->mNormals != NULL;
     hasUVs |= assimpMesh->mTextureCoords[0] != NULL;
     hasVertexColors |= assimpMesh->mColors[0] != NULL;
+    hasTangents |= assimpMesh->mTangents != NULL;
     isSkinned |= assimpMesh->mNumBones > 0;
   }
 
@@ -292,6 +294,7 @@ ModelData* lovrModelDataCreate(Blob* blob) {
   if (hasNormals) vertexFormatAppend(&format, "lovrNormal", ATTR_FLOAT, 3);
   if (hasUVs) vertexFormatAppend(&format, "lovrTexCoord", ATTR_FLOAT, 2);
   if (hasVertexColors) vertexFormatAppend(&format, "lovrVertexColor", ATTR_BYTE, 4);
+  if (hasTangents) vertexFormatAppend(&format, "lovrTangent", ATTR_FLOAT, 3);
   size_t boneByteOffset = format.stride;
   if (isSkinned) vertexFormatAppend(&format, "lovrBones", ATTR_INT, 4);
   if (isSkinned) vertexFormatAppend(&format, "lovrBoneWeights", ATTR_FLOAT, 4);
@@ -378,6 +381,18 @@ ModelData* lovrModelDataCreate(Blob* blob) {
         }
       }
 
+      if (hasTangents) {
+        if (assimpMesh->mTangents) {
+          *vertices.floats++ = assimpMesh->mTangents[v].x;
+          *vertices.floats++ = assimpMesh->mTangents[v].y;
+          *vertices.floats++ = assimpMesh->mTangents[v].z;
+        } else {
+          *vertices.floats++ = 0;
+          *vertices.floats++ = 0;
+          *vertices.floats++ = 0;
+        }
+      }
+
       vertex++;
     }
 

src/graphics/shader.c

@@ -101,6 +101,7 @@ static GLuint linkShaders(GLuint vertexShader, GLuint fragmentShader) {
   glBindAttribLocation(program, LOVR_SHADER_NORMAL, "lovrNormal");
   glBindAttribLocation(program, LOVR_SHADER_TEX_COORD, "lovrTexCoord");
   glBindAttribLocation(program, LOVR_SHADER_VERTEX_COLOR, "lovrVertexColor");
+  glBindAttribLocation(program, LOVR_SHADER_TANGENT, "lovrTangent");
   glBindAttribLocation(program, LOVR_SHADER_BONES, "lovrBones");
   glBindAttribLocation(program, LOVR_SHADER_BONE_WEIGHTS, "lovrBoneWeights");
   glLinkProgram(program);

src/graphics/shader.h

@@ -11,8 +11,9 @@
 #define LOVR_SHADER_NORMAL 1
 #define LOVR_SHADER_TEX_COORD 2
 #define LOVR_SHADER_VERTEX_COLOR 3
-#define LOVR_SHADER_BONES 4
-#define LOVR_SHADER_BONE_WEIGHTS 5
+#define LOVR_SHADER_TANGENT 4
+#define LOVR_SHADER_BONES 5
+#define LOVR_SHADER_BONE_WEIGHTS 6
 #define LOVR_MAX_UNIFORM_LENGTH 256
 
 typedef enum {

src/resources/shaders.c

@@ -32,6 +32,7 @@ const char* lovrShaderVertexPrefix = ""
 "in vec3 lovrNormal; \n"
 "in vec2 lovrTexCoord; \n"
 "in vec4 lovrVertexColor; \n"
+"in vec3 lovrTangent; \n"
 "in ivec4 lovrBones; \n"
 "in vec4 lovrBoneWeights; \n"
 "out vec2 texCoord; \n"