From a51c1936f2bfd586662899ecff8571d22fa79f00 Mon Sep 17 00:00:00 2001
From: Martin Felis <martin@fysx.org>
Date: Mon, 19 Mar 2018 23:01:46 +0100
Subject: [PATCH] Can now load gltf models (but not display them yet)

---
 3rdparty/tinygltf/tiny_gltf.h      |  4 ++--
 src/modules/CMakeLists.txt         |  1 +
 src/modules/RenderModule.cc        | 23 ++++++++++++++++++++++-
 src/modules/RenderUtils.cc         |  4 ----
 src/modules/RenderUtils.h          | 17 ++++++++++++++++-
 src/modules/gltf_implementation.cc |  4 ++++
 6 files changed, 45 insertions(+), 8 deletions(-)
 create mode 100644 src/modules/gltf_implementation.cc

diff --git a/3rdparty/tinygltf/tiny_gltf.h b/3rdparty/tinygltf/tiny_gltf.h
index 23c1ebb..500923e 100644
--- a/3rdparty/tinygltf/tiny_gltf.h
+++ b/3rdparty/tinygltf/tiny_gltf.h
@@ -732,7 +732,7 @@ typedef bool (*LoadImageDataFunction)(Image *, std::string *, int, int,
 
 #ifndef TINYGLTF_NO_STB_IMAGE
 // Declaration of default image loader callback
-static bool LoadImageData(Image *image, std::string *err, int req_width,
+bool LoadImageData(Image *image, std::string *err, int req_width,
                           int req_height, const unsigned char *bytes, int size,
                           void *);
 #endif
@@ -1197,7 +1197,7 @@ void TinyGLTF::SetImageLoader(LoadImageDataFunction func, void *user_data) {
 }
 
 #ifndef TINYGLTF_NO_STB_IMAGE
-static bool LoadImageData(Image *image, std::string *err, int req_width,
+bool LoadImageData(Image *image, std::string *err, int req_width,
                           int req_height, const unsigned char *bytes, int size,
                           void *) {
   int w, h, comp;
diff --git a/src/modules/CMakeLists.txt b/src/modules/CMakeLists.txt
index 5ee30ca..9588c74 100644
--- a/src/modules/CMakeLists.txt
+++ b/src/modules/CMakeLists.txt
@@ -5,6 +5,7 @@ INCLUDE_DIRECTORIES (
 ADD_LIBRARY (RenderModule SHARED 
 	RenderModule.cc
 	RenderUtils.cc
+	gltf_implementation.cc
 	)
 
 ADD_LIBRARY (TestModule SHARED
diff --git a/src/modules/RenderModule.cc b/src/modules/RenderModule.cc
index 7a232f8..a6378c3 100644
--- a/src/modules/RenderModule.cc
+++ b/src/modules/RenderModule.cc
@@ -10,8 +10,13 @@
 
 using namespace SimpleMath::GL;
 
+typedef tinygltf::Model Model;
+typedef tinygltf::TinyGLTF GLTFLoader;
+
 struct Renderer;
 
+float moving_factor = 1.0f;
+
 struct RendererSettings {
 	bool DrawDepth = false;
 	bool DrawLightDepth = false;
@@ -59,6 +64,9 @@ VertexArrayMesh gXZPlaneMesh;
 VertexArrayMesh gUnitCubeMesh;
 VertexArrayMesh gScreenQuad;
 
+Model gModel;
+GLTFLoader gLoader;
+
 //
 // Module
 //
@@ -386,6 +394,16 @@ void Renderer::Initialize(int width, int height) {
 	mLight.mShadowMapTarget.mQuadMesh = &gScreenQuad;
 	mLight.mShadowMapTarget.mLinearizeDepthProgram = mRenderQuadProgramDepth;
 	mLight.mShadowMapTarget.mLinearizeDepthProgram.RegisterFileModification();
+
+	// Model
+	std::string model_file = "data/models/Cube/Cube.gltf";
+	std::string err;
+	bool result = gLoader.LoadASCIIFromFile(&gModel, &err, model_file.c_str());
+	if (!err.empty()) {
+		gLog("Error loading model '%s': %s", model_file.c_str(), err.c_str());
+	} else {
+		gLog("Successfully loaded model '%s'", model_file.c_str());
+	}
 }
 
 void Renderer::Shutdown() {
@@ -539,7 +557,7 @@ void Renderer::RenderScene(RenderProgram &program, const Camera& camera) {
 	
 	program.SetMat44("uModelMatrix", 
 			RotateMat44(200.0f, 0.0f, 1.0f, 0.0f)
-			* TranslateMat44(-2.0f, 1.0f, -8.0f)
+			* TranslateMat44(moving_factor * sin(gTimer->mCurrentTime), 1.0f, 0.0f)
 			* ScaleMat44(0.5f, 0.5f, 0.5f));
 	
 	program.SetVec4("uColor", Vector4f (1.0f, 1.0f, 1.0f, 1.0f));
@@ -582,6 +600,9 @@ void Renderer::RenderGui() {
 	ImGui::EndDock();
 
 	if (ImGui::BeginDock("Render Settings")) {
+		ImGui::Text("Scene");
+		ImGui::SliderFloat("Moving Factor", &moving_factor, -10.0f, 10.0f);
+
 		ImGui::Text("Camera");
 		mCamera.DrawGui();
 
diff --git a/src/modules/RenderUtils.cc b/src/modules/RenderUtils.cc
index 4916401..a937116 100644
--- a/src/modules/RenderUtils.cc
+++ b/src/modules/RenderUtils.cc
@@ -12,10 +12,6 @@
 #include "imgui/imgui.h"
 #include "imgui_dock.h"
 
-#define STB_IMAGE_IMPLEMENTATION
-
-#include "stb/stb_image.h"
-
 using namespace SimpleMath;
 using namespace SimpleMath::GL;
 
diff --git a/src/modules/RenderUtils.h b/src/modules/RenderUtils.h
index d3007e3..42b3800 100644
--- a/src/modules/RenderUtils.h
+++ b/src/modules/RenderUtils.h
@@ -7,6 +7,8 @@
 
 #include "FileModificationObserver.h"
 
+#include "tinygltf/tiny_gltf.h"
+
 #include <vector>
 
 // Forward declarations
@@ -288,7 +290,7 @@ struct Texture {
 };
 
 /**
- * Multiple VertexArrayMeshes can be stored in a single VertexArray.
+ * Storage for (multiple) VertexArrayMeshes
  * Storage order is:
  *   (VVVV)(NNNN)(UV)(CCCC)
  */
@@ -413,4 +415,17 @@ struct VertexArrayMesh {
 	void Draw(GLenum mode);
 };
 
+struct RenderCommand {
+	typedef enum {
+		EnableShadowPass = 1
+	} Flags;
+
+	int mFlags;
+	GLenum mDrawMode;
+	Vector4f mColor = Vector4f (1.0f, 1.0f, 1.0f, 1.0f);
+
+	Matrix44f mTransform;
+	VertexArrayMesh *mMesh;
+};
+
 #endif
diff --git a/src/modules/gltf_implementation.cc b/src/modules/gltf_implementation.cc
new file mode 100644
index 0000000..61e7fda
--- /dev/null
+++ b/src/modules/gltf_implementation.cc
@@ -0,0 +1,4 @@
+#define TINYGLTF_IMPLEMENTATION
+#define STB_IMAGE_IMPLEMENTATION
+//#include "stb/stb_image.h"
+#include "tinygltf/tiny_gltf.h"