From 2c6036f653e712692abe488397d89d0946ec5aa7 Mon Sep 17 00:00:00 2001
From: Jip <jipboesenkool@hotmail.com>
Date: Sat, 4 May 2024 23:12:24 +0200
Subject: [PATCH] Got the meshes somewhat working, the models are not
 consistent with their winding order and ray doesn't allow to render both
 sides of a face?, to truly see if everything works correctly we need the bone
 transformation to be applied to the model

---
 library/CMakeLists.txt                |   6 +
 library/libvitaboy/CMakeLists.txt     |   1 +
 library/renderdemo_ray/CMakeLists.txt |  36 +++
 library/renderdemo_ray/main.cpp       | 349 ++++++++++++++++++++++++++
 4 files changed, 392 insertions(+)
 create mode 100644 library/renderdemo_ray/CMakeLists.txt
 create mode 100644 library/renderdemo_ray/main.cpp

diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 5991521..640f88d 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -5,6 +5,7 @@ cmake_minimum_required(VERSION 2.6)
 
 enable_language(ASM)
 
+option(BUILD_EXAMPLES "Build the render demos" ON)
 option(BUILD_SHARED_LIBS "Build using shared libraries" OFF)
 if(BUILD_SHARED_LIBS)
     set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
@@ -141,4 +142,9 @@ add_subdirectory(formats)
 add_subdirectory(libgldemo)
 add_subdirectory(libvitaboy)
 
+if(BUILD_EXAMPLES)
+    add_subdirectory(renderdemo_ray)
+endif()
+
 unset(BUILD_SHARED_LIBS CACHE)
+unset(BUILD_EXAMPLES CACHE)
diff --git a/library/libvitaboy/CMakeLists.txt b/library/libvitaboy/CMakeLists.txt
index 2c616cd..3ff4278 100644
--- a/library/libvitaboy/CMakeLists.txt
+++ b/library/libvitaboy/CMakeLists.txt
@@ -17,6 +17,7 @@ set(LIBVITABOY_SOURCES
     po.cpp
     skel.cpp
 )
+
 if(WIN32)
     set(LIBVITABOY_SOURCES ${LIBVITABOY_SOURCES} resource.rc)
 else()
diff --git a/library/renderdemo_ray/CMakeLists.txt b/library/renderdemo_ray/CMakeLists.txt
new file mode 100644
index 0000000..080638b
--- /dev/null
+++ b/library/renderdemo_ray/CMakeLists.txt
@@ -0,0 +1,36 @@
+cmake_minimum_required(VERSION 3.0)
+project(renderdemoray)
+
+# Adding Raylib
+include(FetchContent)
+set(FETCHCONTENT_QUIET FALSE)
+set(BUILD_EXAMPLES OFF CACHE BOOL "" FORCE) # don't build the supplied examples
+set(BUILD_GAMES    OFF CACHE BOOL "" FORCE) # don't build the supplied example games
+
+#set raylib settings
+add_compile_definitions(SUPPORT_FILEFORMAT_JPG)
+
+FetchContent_Declare(
+    raylib
+    GIT_REPOSITORY "https://github.com/raysan5/raylib.git"
+    GIT_TAG "master"
+    GIT_PROGRESS TRUE
+)
+FetchContent_MakeAvailable(raylib)
+
+include_directories(${FILEHANDLER_INCLUDE})
+include_directories(${VITABOY_INCLUDE})
+
+# Adding our source files
+file(GLOB_RECURSE PROJECT_SOURCES CONFIGURE_DEPENDS "${CMAKE_CURRENT_LIST_DIR}/*.cpp") # Define PROJECT_SOURCES as a list of all source files
+set(PROJECT_INCLUDE "${CMAKE_CURRENT_LIST_DIR}/*.h") # Define PROJECT_INCLUDE to be the path to the include directory of the project
+
+# Declaring our executable
+add_executable(${PROJECT_NAME})
+target_sources(${PROJECT_NAME} PRIVATE ${PROJECT_SOURCES})
+target_include_directories(${PROJECT_NAME} PRIVATE ${PROJECT_INCLUDE})
+target_link_libraries(${PROJECT_NAME} PRIVATE raylib libvitaboy_static FileHandler_static)
+
+# Setting ASSETS_PATH
+target_compile_definitions(${PROJECT_NAME} PUBLIC ASSETS_PATH="${CMAKE_CURRENT_SOURCE_DIR}/assets/") # Set the asset path macro to the absolute path on the dev machine
+#target_compile_definitions(${PROJECT_NAME} PUBLIC ASSETS_PATH="./assets") # Set the asset path macro in release mode to a relative path that assumes the assets folder is in the same directory as the game executable
\ No newline at end of file
diff --git a/library/renderdemo_ray/main.cpp b/library/renderdemo_ray/main.cpp
new file mode 100644
index 0000000..6e6c197
--- /dev/null
+++ b/library/renderdemo_ray/main.cpp
@@ -0,0 +1,349 @@
+#include "raylib.h"
+#include "raymath.h"        // Required for: Vector3, Quaternion and Matrix functionality
+#include "utils.h"          // Required for: TRACELOG(), LoadFileData(), LoadFileText(), SaveFileText()
+
+#include <string>
+#include <cassert>
+#include <FileHandler.h>
+#include "../libvitaboy/libvitaboy.hpp"
+
+
+#define SCREEN_WIDTH (1920)
+#define SCREEN_HEIGHT (1080)
+#define WINDOW_TITLE "libvitaboy - Renderer - Ray"
+
+//we dont look in this mess for now
+#pragma region TSO
+
+//util
+static bool Read(const char* Filename, uint8_t** InData) {
+    *InData = File::ReadFile(Filename);
+    if (*InData != NULL) {
+        VBFile.set(*InData, File::FileSize);
+        return true;
+    }
+    return false;
+}
+
+//globals
+//skeleton
+static Skeleton_t Skeleton;
+static void DrawBonesSkeleton(Bone_t& Bone)
+{
+    const float size = 0.1f;
+    const Vector3 position{Bone.Translation.x, Bone.Translation.y, Bone.Translation.z};
+    Color color;
+    if(!strcmp(Bone.Name, "ROOT"))
+    {
+        color = RED;
+    }
+    else if(!strcmp(Bone.Name, "HEAD"))
+    {
+        color = YELLOW;
+    }
+    else
+    {
+        color = GREEN;
+    }
+    DrawCube(position, size, size, size, color);
+
+    if(Bone.ChildrenCount == 1)
+    {
+        DrawBonesSkeleton(*Bone.Children[0]);
+    }
+    else if(Bone.ChildrenCount > 1)
+    {
+        for(unsigned i=0; i<Bone.ChildrenCount; i++)
+        {
+            DrawBonesSkeleton(*Bone.Children[i]);
+        }
+    }
+}
+
+//animation
+static Animation_t Animation;
+static float AnimationTime = 0;
+
+static void AdvanceFrame(Skeleton_t& Skeleton, Animation_t& Animation, float TimeDelta)
+{
+    float Duration = (float)Animation.Motions[0].FrameCount/30;
+    AnimationTime += TimeDelta;
+    AnimationTime = fmodf(AnimationTime, Duration); //Loop the animation
+
+    for(unsigned i=0; i<Animation.MotionsCount; i++){
+        unsigned BoneIndex = FindBone(Skeleton, Animation.Motions[i].BoneName, Skeleton.BoneCount);
+        if(BoneIndex == (unsigned)-1) continue;
+
+        Bone_t& Bone = Skeleton.Bones[BoneIndex];
+
+        unsigned Frame = AnimationTime*30;
+        float FractionShown = AnimationTime*30 - Frame;
+        unsigned NextFrame = (Frame+1 != Animation.Motions[0].FrameCount) ? Frame+1 : 0;
+
+        if(Animation.Motions[i].HasTranslation){
+            Translation_t& Translation = Animation.Motions[i].Translations[Frame];
+            Translation_t& NextTranslation = Animation.Motions[i].Translations[NextFrame];
+            Bone.Translation.x = (1-FractionShown)*Translation.x + FractionShown*NextTranslation.x;
+            Bone.Translation.y = (1-FractionShown)*Translation.y + FractionShown*NextTranslation.y;
+            Bone.Translation.z = (1-FractionShown)*Translation.z + FractionShown*NextTranslation.z;
+        }
+        if(Animation.Motions[i].HasRotation){
+            Rotation_t& Rotation = Animation.Motions[i].Rotations[Frame];
+            Rotation_t& NextRotation = Animation.Motions[i].Rotations[NextFrame];
+
+            //Use nlerp to interpolate
+            float w1 = 1.0f - FractionShown, w2 = FractionShown;
+            if(DotProduct(&Rotation, &NextRotation) < 0)
+                w1 *= -1;
+
+            Bone.Rotation.x = w1*Rotation.x + w2*NextRotation.x;
+            Bone.Rotation.y = w1*Rotation.y + w2*NextRotation.y;
+            Bone.Rotation.z = w1*Rotation.z + w2*NextRotation.z;
+            Bone.Rotation.w = w1*Rotation.w + w2*NextRotation.w;
+
+            Normalize(&Bone.Rotation);
+        }
+    }
+}
+
+//textures
+static Texture2D textures[3];
+enum { Texture_Body, Texture_Head, Texture_Hand };
+static const char* const TexturePaths[] = {"body.jpg", "head.jpg", "hand.jpg"};
+
+static bool LoadTextures()
+{
+    for(int i=0; i < 3; i++)
+    {
+        textures[i] = LoadTexture(TexturePaths[i]);
+    }
+    return true;
+}
+
+//meshes
+static const unsigned MeshCount = 4;
+static Mesh_t Meshes[4];
+enum { Mesh_Body, Mesh_Head, Mesh_LHand, Mesh_RHand };
+static const char* const MeshPaths[]    = {"body.mesh", "head.mesh", "lhand.mesh", "rhand.mesh" };
+static const unsigned Mesh_UseTexture[] = { Texture_Body, Texture_Head, Texture_Hand, Texture_Hand };
+static const char* const MeshActivate[] = {NULL, "HEAD", "L_HAND", "R_HAND"};
+
+static bool LoadMeshes()
+{
+    uint8_t* InData;
+
+    for (unsigned i = 0; i < MeshCount; i++) {
+        if (!Read(MeshPaths[i], &InData))
+        {
+            return false;
+        }
+        ReadMesh(Meshes[i]);
+        free(InData);
+    }
+    return true;
+}
+#pragma endregion TSO
+
+#pragma region custom_ray
+namespace CustomRay
+{
+    static Model LoadModelTSO()
+    {
+        Model model;
+        //meshes
+        model.meshCount = MeshCount;
+        model.meshes = (Mesh*)RL_CALLOC(model.meshCount, sizeof(Mesh));
+        //textures
+        model.materialCount = 3;
+        model.meshMaterial = (int*)RL_CALLOC(model.meshCount, sizeof(int)); // Material index assigned to each mesh
+        model.materials = (Material*)RL_CALLOC(model.materialCount, sizeof(Material));
+        model.meshMaterial[0] = 0;  // By default, assign material 0 to each mesh
+
+        ///load the textures
+        for (int i = 0; i < model.materialCount; i++)
+        {
+            model.materials[i] = LoadMaterialDefault();
+            model.materials[i].maps[MATERIAL_MAP_DIFFUSE].texture = textures[i];
+        }
+
+        //load meshes
+        for (int i = 0; i < model.meshCount; i++) 
+        {
+            Mesh_t& tso_mesh = Meshes[i];
+            Mesh&   ray_mesh = model.meshes[i];
+
+            ray_mesh.vertexCount = tso_mesh.RealVertexCount;
+            ray_mesh.triangleCount = tso_mesh.FaceCount;   // Face count (triangulated)
+            ray_mesh.vertices = (float*)RL_CALLOC(ray_mesh.vertexCount * 3, sizeof(float));
+            ray_mesh.texcoords = (float*)RL_CALLOC(ray_mesh.vertexCount * 2, sizeof(float));
+            ray_mesh.normals = (float*)RL_CALLOC(ray_mesh.vertexCount * 3, sizeof(float));
+            ray_mesh.indices = (unsigned short*)RL_CALLOC(ray_mesh.triangleCount * 3, sizeof(unsigned short));
+
+            // Process all mesh faces
+            //indices
+            for (unsigned j = 0; j < ray_mesh.triangleCount; j++)
+            {
+                ray_mesh.indices[j * 3 + 0] = (unsigned short)tso_mesh.FaceData[j].VertexA;
+                ray_mesh.indices[j * 3 + 1] = (unsigned short)tso_mesh.FaceData[j].VertexC;
+                ray_mesh.indices[j * 3 + 2] = (unsigned short)tso_mesh.FaceData[j].VertexB;
+            }
+            //vertex data
+            for (unsigned j = 0; j < ray_mesh.vertexCount; j++)
+            {
+                //vertices?
+                ray_mesh.vertices[j * 3 + 0] = tso_mesh.VertexData[j].Coord.x + (i * 2.f);
+                ray_mesh.vertices[j * 3 + 1] = tso_mesh.VertexData[j].Coord.y;
+                ray_mesh.vertices[j * 3 + 2] = tso_mesh.VertexData[j].Coord.z;
+                //coords
+                ray_mesh.texcoords[j * 2 + 0] = tso_mesh.TransformedVertexData[j].TextureCoord.u;
+                ray_mesh.texcoords[j * 2 + 1] = -tso_mesh.TransformedVertexData[j].TextureCoord.v;
+                //normals
+                ray_mesh.normals[j * 3 + 0] = tso_mesh.TransformedVertexData[j].NormalCoord.x;
+                ray_mesh.normals[j * 3 + 0] = tso_mesh.TransformedVertexData[j].NormalCoord.y;
+                ray_mesh.normals[j * 3 + 0] = tso_mesh.TransformedVertexData[j].NormalCoord.z;
+            }
+
+            //select the textures
+            model.meshMaterial[i] = Mesh_UseTexture[i];
+        }
+
+        //upload to gpu
+        // Make sure model transform is set to identity matrix!
+        model.transform = MatrixIdentity();
+        if ((model.meshCount != 0) && (model.meshes != NULL))
+        {
+            // Upload vertex data to GPU (static meshes)
+            for (int i = 0; i < model.meshCount; i++) UploadMesh(&model.meshes[i], false);
+        }
+        else TRACELOG(LOG_WARNING, "MESH: [%s] Failed to load model mesh(es) data", fileName);
+
+        if (model.materialCount == 0)
+        {
+            TRACELOG(LOG_WARNING, "MATERIAL: [%s] Failed to load model material data, default to white material", fileName);
+
+            model.materialCount = 1;
+            model.materials = (Material*)RL_CALLOC(model.materialCount, sizeof(Material));
+            model.materials[0] = LoadMaterialDefault();
+
+            if (model.meshMaterial == NULL)
+            {
+                model.meshMaterial = (int*)RL_CALLOC(model.meshCount, sizeof(int));
+            }
+        }
+
+        return model;
+    }
+
+    ModelAnimation LoadModelAnimationsTSO()
+    {
+        ModelAnimation result;
+
+        return result;
+    }
+
+    //https://gist.github.com/Gamerfiend/18206474679bf5873925c839d0d6a6d0
+    void LoadSkeletonTSO()
+    {
+        //Raylib combines skeleton data with the model data
+    }
+}
+#pragma endregion custom_ray
+
+static int Startup()
+{
+    uint8_t * InData;
+    if(!Read("skeleton.skel", &InData))
+        return 0;
+    ReadSkeleton(Skeleton);
+    free(InData);
+
+    for(unsigned i=0; i<MeshCount; i++){
+        if(!Read(MeshPaths[i], &InData))
+            return 0;
+        ReadMesh(Meshes[i]);
+        free(InData);
+    }
+
+    if(!Read("animation.anim", &InData))
+        return 0;
+    ReadAnimation(Animation);
+    free(InData);
+
+    AdvanceFrame(Skeleton, Animation, 0);
+    return 1;
+}
+
+//settings
+static bool ShowTextures = false;
+static bool ShowMesh = true;
+static bool ShowSkeleton = true;
+int main(void)
+{
+    InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, WINDOW_TITLE);
+    SetTargetFPS(60);
+
+    // Initialize the camera
+    Camera3D camera = { 0 };
+    camera.position = Vector3{ 0.f, 3.0f, 5.0f }; // Camera position
+    camera.target = Vector3{ 0.0f, 0.0f, 0.0f };  // Camera looking at point
+    camera.up = Vector3{ 0.0f, 1.0f, 0.0f };      // Camera up vector (rotation towards target)
+    camera.fovy = 70.0f;                          // Camera field-of-view Y
+    camera.projection = CAMERA_PERSPECTIVE;       // Camera projection type - we will probably need orthographic
+
+    //doesn't work when ran from VSStudio
+    assert( Startup() );
+    assert( LoadTextures() );
+    assert( LoadMeshes() );
+
+    Model model = CustomRay::LoadModelTSO();
+
+    DisableCursor();
+
+    while (!WindowShouldClose())
+    {
+        const float dt{ GetFrameTime() };
+        //update
+        {
+            UpdateCamera(&camera, CAMERA_FREE);
+            // Play animation when spacebar is held down
+            if (IsKeyDown(KEY_N))
+            {
+                AdvanceFrame(Skeleton, Animation, dt);
+            }
+        }
+
+        BeginDrawing();
+        {
+            ClearBackground(DARKPURPLE);
+            BeginMode3D(camera);
+            {
+                DrawGrid(10, 5.0f);
+                if(ShowSkeleton)
+                {
+                    DrawBonesSkeleton(Skeleton.Bones[0]);
+                }
+
+                if (ShowMesh)
+                {
+                    const Vector3 position{ 0.0f, 0.0f, 0.0f }; // Set model position
+                    const float scale = 1.f;
+                    DrawModel(model, position, scale, WHITE);
+                }
+            }
+            EndMode3D();
+            
+            //debug textures
+            if(ShowTextures)
+            {
+                for(int i=0; i < 3; i++)
+                {
+                    DrawTexture(textures[i], i * 100, 0, WHITE);
+                }
+            }
+        }
+        EndDrawing();
+    }
+
+    CloseWindow();
+    return 0;
+}
\ No newline at end of file