Model loading and texturing

CMakeLists.txt

@@ -37,9 +37,9 @@ target_link_libraries(couch couchlua)
 add_subdirectory(thirdparty)
 
 add_subdirectory(shaders)
+add_dependencies(couch shader_headers)
 target_include_directories(couch
-  PUBLIC "${CMAKE_CURRENT_BINARY_DIR}/shaders")
-
+  PUBLIC "${CMAKE_CURRENT_BINARY_DIR}/shaders/")
 
 if(WIN32)
   target_link_libraries(couch glfw3dll)

core/Mesh.cpp

@@ -5,7 +5,9 @@ Mesh::Mesh() {
 }
 
 Mesh::~Mesh() {
-  delete material;
+  if (material) {
+    delete material;
+  }
 }
 
 Mesh::Mesh(VertexList vertices, IndexList indices) {
@@ -38,8 +40,26 @@ void Mesh::SetupMesh() {
   glBindVertexArray(0);
 }
 
-Mesh Mesh::FromFile(const char *filename) {
-  return Mesh();
+Mesh* Mesh::FromFile(const char *filename) {
+  // HOCUS: https://assimp-docs.readthedocs.io/en/latest/usage/use_the_lib.html
+  Assimp::Importer importer;
+
+  const aiScene* scene = importer.ReadFile(
+    filename, // Read the file
+    aiProcess_Triangulate | // We only do triangles
+    aiProcess_GenNormals | // We want normals precalculated
+    aiProcess_GenUVCoords // We want UV mappings precalculated
+    );
+
+  if (!scene) {
+    std::cerr << importer.GetErrorString() << std::endl;
+    exit(1);
+  }
+
+  aiNode *root = scene->mRootNode;
+  aiMesh *mesh_to_import = scene->mMeshes[root->mMeshes[0]];
+
+  return Util::aiMesh2Mesh(mesh_to_import);
 }
 
 void Mesh::Draw() {

core/Mesh.h

@@ -2,8 +2,16 @@
 #define MESH_H
 
 #include <list>
+#include <iostream>
+#include <stdlib.h>
+
+// Thirdpart includes
+#include <assimp/Importer.hpp>
+#include <assimp/scene.h>
+#include <assimp/postprocess.h>
 
 #include "types.h"
+#include "Util.h"
 #include "Spatial.h"
 #include "Vertex.h"
 #include "Index.h"
@@ -17,7 +25,7 @@ public:
   Mesh();
   ~Mesh();
   Mesh(VertexList vertices, IndexList indices);
-  static Mesh FromFile(const char *filename);
+  static Mesh *FromFile(const char *filename);
   virtual bool IsDrawable() const {return true;}
   virtual void Draw();
   virtual void SetupMesh();

core/Util.cpp

@@ -0,0 +1,18 @@
+#include "Util.h"
+
+Mesh *Util::aiMesh2Mesh(aiMesh *aimesh){
+  Mesh *mymesh = new Mesh();
+  for (int i = 0; i < aimesh->mNumVertices; i++) {
+    aiVector3D aiPosition = aimesh->mVertices[i];
+    aiVector3D aiUV = aimesh->mTextureCoords[0][i]; // TODO get ALL texture coords
+    Vertex vertex(aiPosition.x, aiPosition.y, aiPosition.z, aiUV.x, aiUV.y);
+    mymesh->vertices.push_back(vertex);
+  }
+  for (int i = 0; i < aimesh->mNumFaces; i++) {
+    // We're importing triangulated meshes, so each face is three indices
+    unsigned int *face = aimesh->mFaces[i].mIndices;
+    Index index(face[0], face[1], face[2]);
+    mymesh->indices.push_back(index);
+  }
+  return mymesh;
+}

core/Util.h

@@ -0,0 +1,15 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+// Thirdparty includes
+#include <assimp/mesh.h>
+
+// Gahhhhhh mutual inclusion!
+#include "Mesh.h"
+class Mesh;
+
+namespace Util {
+  Mesh *aiMesh2Mesh(aiMesh *mesh);
+}
+
+#endif /* UTIL_H */

demo/main.lua

@@ -40,6 +40,12 @@ function init()
    couch.Node.GetRoot().children:Append(ball1)
 
    ball1.transform:Translate(0.0, 3.0, 0.0)
+
+   cube = couch.Mesh.FromFile("cube.glb")
+   cube:SetupMesh();
+   cube.material.tex = couch.Texture.FromFile("container.png")
+   cube.material.usesTex = true
+   couch.Node.GetRoot().children:Append(cube)
 end
 
 function update(delta)

shaders/CMakeLists.txt

@@ -1,14 +1,16 @@
 project(Couch)
 
-file(GLOB shaders *.vert *.frag)
-list(
-  TRANSFORM shaders
-  APPEND .h
-  OUTPUT_VARIABLE shader_header_files)
+macro(add_shader shaderfile)
+  add_custom_command(
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${shaderfile}.h
+    COMMAND perl "${CMAKE_CURRENT_SOURCE_DIR}/makeheaders.pl" ${CMAKE_CURRENT_SOURCE_DIR}/${shaderfile} ${CMAKE_CURRENT_BINARY_DIR}/${shaderfile}.h
+    DEPENDS ${shaderfile} makeheaders.pl
+    )
+endmacro()
+
+add_shader(flat.vert)
+add_shader(flat.frag)
 
 add_custom_target(shader_headers
-  BYPRODUCTS ${shader_header_files}
-  COMMAND perl "${CMAKE_CURRENT_SOURCE_DIR}/makeheaders.pl"
-  DEPENDS ${shaders} ${CMAKE_CURRENT_SOURCE_DIR}/makeheaders.pl)
-
-add_dependencies(couch shader_headers)
+  DEPENDS flat.vert.h flat.frag.h
+  COMMENT "Generated shaders headers.")

shaders/makeheaders.pl

@@ -1,33 +1,27 @@
 use strict;
 use warnings;
+use File::Basename;
 
-sub convert {
-    my $filename = $1;
-    
-    my $headerguard = "$filename.h";
-    $headerguard =~ tr/a-z./A-Z_/;
-    
-    my $constname = "$filename";
-    $constname =~ tr/./_/;
+my ($filename, $outfilename) = @ARGV;
 
-    open my $fin, '<', $filename;
-    open my $fout, '>', "$filename.h";
-    
-    print $fout "#ifndef $headerguard \n#define $headerguard\nconst char * $constname = \n";
+my $headerguard = basename $outfilename;
+$headerguard =~ tr/a-z./A-Z_/;
 
-    while(my $line = <$fin>) {
-	$line =~ s/\n/\\n/;
-	print $fout "\"$line\"\n";
-    }
+my $constname = basename "$filename";
+$constname =~ tr/./_/;
 
-    print $fout ";\n#endif // $headerguard\n";
-    close $fin;
-    close $fout;
+open(my $fin, '<', $filename) or die("Couldn't find $filename");
+open my $fout, '>', $outfilename;
+
+print $fout "#ifndef $headerguard \n#define $headerguard\nconst char * $constname = \n";
+
+while(my $line = <$fin>) {
+    $line =~ s/\n/\\n/;
+    print $fout "\"$line\"\n";
 }
 
-opendir DIR, ".";
-while (readdir DIR) {
-    if (/(.*\.(frag|vert))/) {
-	convert;
-    }
-}
+print $fout ";\n#endif // $headerguard\n";
+close $fin;
+close $fout;
+print "Generated $outfilename\n";
+

thirdparty/CMakeLists.txt

@@ -1,7 +1,15 @@
 project(Couch)
 
+
+## STB (image)
 target_include_directories(couch
   PUBLIC stb)
-
 target_include_directories(couchlua
   PUBLIC stb)
+
+## ASSIMP
+set(ASSIMP_BUILD_ALL_IMPORTERS_BY_DEFAULT FALSE CACHE BOOL "Turn off all assimp importers")
+set(ASSIMP_BUILD_GLTF_IMPORTER ON CACHE BOOL "Turn on gltf importer")
+add_subdirectory(assimp)
+target_link_libraries(couch assimp::assimp)
+target_link_libraries(couchlua assimp::assimp)