feat: implemented default shader

resources/default_shader.fs

@@ -0,0 +1,20 @@
+#version 330
+
+in vec2 fragTexCoord; // texture coordinate
+in vec3 fragNormal;   // normal direction
+
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+out vec4 finalColor;
+
+uniform vec3 lightDirection; // direction of light
+uniform vec4 ambient;
+
+void main() {
+    vec4 texelColor = texture(texture0, fragTexCoord);
+    vec3 light_dot = vec3(pow(dot(fragNormal, lightDirection)-0.2, 3.0));
+    finalColor = texelColor * colDiffuse * vec4(light_dot, 1.0);
+    finalColor += texelColor * (ambient/10.0) * colDiffuse;
+    finalColor = pow(finalColor, vec4(vec3(0.6), 1.0));
+}

resources/default_shader.vs

@@ -0,0 +1,25 @@
+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexColor;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform mat4 matModel;
+
+// Output vertex attributes (to fragment shader)
+out vec2 fragTexCoord;
+out vec3 fragNormal;
+
+void main()
+{
+    // Send vertex attributes to fragment shader
+    fragTexCoord = vertexTexCoord;
+    fragNormal = normalize(vec3(matModel * vec4(vertexNormal, 1.0)));
+
+    // Calculate final vertex position
+    gl_Position = mvp*vec4(vertexPosition, 1.0);
+}

src/core/mesh_render_entity.c

@@ -25,6 +25,7 @@ impl_Renderable_for(MeshRenderEntity,
 SceneNode *CreateMeshRenderEntity(char const *resource_path) {
     MeshRenderEntity *self = new(MeshRenderEntity);
     GetModelResource(resource_path, &self->model);
+    GetShaderResource("default_shader", &self->shader);
     return CreateSceneNode(MeshRenderEntity_as_SceneNodeEntity(self));
 }
 
@@ -36,15 +37,24 @@ void MeshRenderEntityEnterTree(MeshRenderEntity *self) {
     SceneNodeEntity parent_entity = self->node->parent->entity;
     self->transform = TC_CAST(parent_entity, Transformable);
     LoadResource(self->model.handle);
+    LoadResource(self->shader.handle);
+    Vector3 light_direction = Vector3Normalize((Vector3){1.f, 1.f, 0.f});
+    SetShaderValue(*self->shader.resource, GetShaderLocation(*self->shader.resource, "lightDirection"), &light_direction, SHADER_UNIFORM_VEC3);
+    SetShaderValue(*self->shader.resource, GetShaderLocation(*self->shader.resource, "ambient"), &BLACK, SHADER_UNIFORM_VEC4);
+    for(size_t i = 0; i < self->model.resource->materialCount; ++i)
+        self->model.resource->materials[i].shader = *self->shader.resource;
     AddRenderable(MeshRenderEntity_as_Renderable(self));
 }
 
 void MeshRenderEntityExitTree(MeshRenderEntity *self) {
     ReleaseResource(self->model.handle);
+    ReleaseResource(self->shader.handle);
     RemoveRenderable(MeshRenderEntity_as_Renderable(self));
 }
 
 void MeshRenderEntityDraw(MeshRenderEntity *self) {
     self->model.resource->transform = TransformGetMatrix(self->transform.tc->get_global_transform(self->transform.data));
-    DrawModel(*self->model.resource, (Vector3){0.f, 0.f, 0.f}, 1.f, WHITE);
+    BeginShaderMode(*self->shader.resource);
+    DrawModel(*self->model.resource, Vector3Zero(), 1.0f, WHITE);
+    EndShaderMode();
 }

src/core/mesh_render_entity.h

@@ -12,6 +12,7 @@ typedef struct MeshRenderEntity {
     SceneNode *node;
     Transformable transform;
     ModelResource model;
+    ShaderResource shader;
 } MeshRenderEntity;
 
 extern SceneNode *CreateMeshRenderEntity(char const *resource_path);

src/core/resources.c

@@ -8,7 +8,7 @@
 char const *RESOURCE_DIRECTORY = "resources";
 
 typedef enum ResourceType {
-    RESOURCE_MODEL, RESOURCE_TEXTURE,
+    RESOURCE_MODEL, RESOURCE_TEXTURE, RESOURCE_SHADER,
     RESOURCE_MAX
 } ResourceType;
 
@@ -21,6 +21,7 @@ typedef struct ResourceContainer {
     union {
         Model model;
         Texture texture;
+        Shader shader;
     };
 } ResourceContainer;
 
@@ -31,9 +32,11 @@ static void Internal_LoadModelResource(ResourceContainer *resource);
 static void Internal_UnloadModelResource(ResourceContainer *resource);
 static void Internal_LoadTextureResource(ResourceContainer *resource);
 static void Internal_UnloadTextureResource(ResourceContainer *resource);
+static void Internal_LoadShaderResource(ResourceContainer *resource);
+static void Internal_UnloadShaderResource(ResourceContainer *resource);
 
-LoadResourceFn g_load_functions[] = {Internal_LoadModelResource, Internal_LoadTextureResource};
+LoadResourceFn g_load_functions[] = {Internal_LoadModelResource, Internal_LoadTextureResource, Internal_LoadShaderResource};
-UnloadResourceFn g_unload_functions[] = {Internal_UnloadModelResource, Internal_UnloadTextureResource};
+UnloadResourceFn g_unload_functions[] = {Internal_UnloadModelResource, Internal_UnloadTextureResource, Internal_UnloadShaderResource};
 
 static HashMap g_resource_map;
 static FilePathList g_resource_files;
@@ -52,6 +55,9 @@ static ResourceType ResourceGetTypeFromPath(char const *path) {
     // Model files
     if(IsFileExtension(path, ".glb"))  return RESOURCE_MODEL;
     if(IsFileExtension(path, ".gltf")) return RESOURCE_MODEL;
+    // Shader files
+    if(IsFileExtension(path, ".fg"))   return RESOURCE_SHADER;
+    if(IsFileExtension(path, ".vs"))   return RESOURCE_SHADER;
     return RESOURCE_MAX;
 }
 
@@ -85,13 +91,23 @@ void Internal_IndexResourceDirectory() {
             .is_loaded = false,
             .use_counter = 0,
             .path = g_resource_files.paths[i],
-            .name = GetFileName(g_resource_files.paths[i]),
+            .name = GetFileNameWithoutExt(g_resource_files.paths[i]),
             .type = ResourceGetTypeFromPath(g_resource_files.paths[i])
         };
         // only index resources that the engine knows how to load
-        if(placeholder.type != RESOURCE_MAX) {
+        if(placeholder.type == RESOURCE_SHADER) { // shaders are made up of two files, so their paths are treated differently
+            // if the shader has already been added, don't accidentally add it twice.
+            ResourceContainer *found_container = hash_map_get_as(ResourceContainer, &g_resource_map, &placeholder.name);
+            if(found_container == NULL) {
+                placeholder.path = GetDirectoryPath(placeholder.path);
                 LOG_INFO("Internal_IndexResourceDirectory: Indexing %s as %s", placeholder.path, placeholder.name);
                 hash_map_insert(&g_resource_map, &placeholder.name, &placeholder);
+                LOG_INFO("hash: %zu", strhash(placeholder.name));
+            }
+        } else if(placeholder.type != RESOURCE_MAX) { // regular resources
+            LOG_INFO("Internal_IndexResourceDirectory: Indexing %s as %s", placeholder.path, placeholder.name);
+            hash_map_insert(&g_resource_map, &placeholder.name, &placeholder);
+            LOG_INFO("hash: %zu", strhash(placeholder.name));
         }
     }
 }
@@ -104,6 +120,7 @@ void InitializeResourceSubsystem() {
 void CleanResourceSubsystem() {
     List resources = hash_map_values(&g_resource_map);
     list_foreach(ResourceContainer *,resource, &resources)
+        if(resource->is_loaded)
             g_unload_functions[resource->type](resource);
     hash_map_empty(&g_resource_map);
     UnloadDirectoryFiles(g_resource_files);
@@ -128,7 +145,7 @@ bool GetTextureResource(char const *path, TextureResource *out) {
     *out = ResourceEmpty(Texture);
     // assert some assumptions about the found resource
     ASSERT_RETURN(container != NULL, false, "GetTextureResource: Resource %s not in index.", path);
-    ASSERT_RETURN(container->type != RESOURCE_TEXTURE, false, "GetTextureResource: Resource %s is not a Texture.", path);
+    ASSERT_RETURN(container->type == RESOURCE_TEXTURE, false, "GetTextureResource: Resource %s is not a Texture.", path);
     *out = (TextureResource) {
         .handle = container,
         .resource = &container->texture
@@ -136,6 +153,18 @@ bool GetTextureResource(char const *path, TextureResource *out) {
     return true;
 }
 
+bool GetShaderResource(char const *path, ShaderResource *out) {
+    ResourceContainer *container = hash_map_get_as(ResourceContainer, &g_resource_map, &path);
+    *out = ResourceEmpty(Shader);
+    ASSERT_RETURN(container != NULL, false, "GetShaderResource: Resource %s not in index.", path);
+    ASSERT_RETURN(container->type == RESOURCE_SHADER, false, "GetShaderResource: Resource %s is not a Shader.", path);
+    *out = (ShaderResource) {
+        .handle = container,
+        .resource = &container->shader
+    };
+    return true;
+}
+
 bool IsResourceLoaded(ResourceHandle handle) {
     return handle->is_loaded;
 }
@@ -157,6 +186,7 @@ void ReleaseResource(ResourceHandle handle) {
 
 static
 void Internal_LoadModelResource(ResourceContainer *resource) {
+    LOG_INFO("Loading model from: %s", resource->path);
     resource->model = LoadModel(resource->path);
 }
 
@@ -176,3 +206,16 @@ void Internal_UnloadTextureResource(ResourceContainer *resource) {
     UnloadTexture(resource->texture);
     resource->texture = (Texture){0};
 }
+
+static
+void Internal_LoadShaderResource(ResourceContainer *resource) {
+    resource->shader = LoadShader(TextFormat("%s/%s.vs", resource->path, resource->name), TextFormat("%s/%s.fs", resource->path, resource->name));
+    ASSERT_RETURN(IsShaderReady(resource->shader),, "Internal_LoadShaderResource: Shader failed to load.");
+}
+
+static
+void Internal_UnloadShaderResource(ResourceContainer *resource) {
+    UnloadShader(resource->shader);
+    resource->shader = (Shader){0};
+}
+

src/core/resources.h

@@ -11,6 +11,7 @@ typedef struct ResourceContainer* ResourceHandle;
 
 ResourceType(Model);
 ResourceType(Texture);
+ResourceType(Shader);
 
 //! Allocate and initialize memory required to operate resource subsystem
 extern void InitializeResourceSubsystem();
@@ -20,6 +21,8 @@ extern void CleanResourceSubsystem();
 extern bool GetModelResource(char const *path, ModelResource *out);
 //! Get indexed texture from resources.
 extern bool GetTextureResource(char const *path, TextureResource *out);
+//! Get indexed shader from resources.
+extern bool GetShaderResource(char const *path, ShaderResource *out);
 
 //! Check if a resource is loaded or not.
 extern bool IsResourceLoaded(ResourceHandle handle);

src/main.c

@@ -9,22 +9,30 @@
 #include "utils/debug.h"
 
 Scene *CreateInitialScene() {
+    Transformable transformable;
+    Transform transform;
     SceneNode *root = CreateTransformNode();
+    // create a model with a camera attached as a child of the root of the scene
     SceneNode *model_parent = CreateTransformNode();
     SceneNodeAddChild(root, model_parent);
-
+    // create the rest of the scene with a mesh and a functionality node
-    SceneNode *camera_parent = CreateTransformNode();
+    SceneNodeAddChild(model_parent, CreateMeshRenderEntity("spacefighter"));
-    SceneNodeAddChild(model_parent, camera_parent);
+    SceneNodeAddChild(model_parent, CreateTestObject());
-    // set camera parent location
+    transformable = TC_CAST(model_parent->entity, Transformable);
-    Transformable transformable = TC_CAST(camera_parent->entity, Transformable);
+    transform = transformable.tc->get_global_transform(transformable.data);
-    Transform transform = transformable.tc->get_transform(transformable.data);
+    transform.translation.y += 10;
-    transform.translation = (Vector3){0.f, 3.f, -10.f};
+    transformable.tc->set_global_transform(transformable.data, transform);
+    // create a camera attached to it's own transform node
+    SceneNode *camera_parent = CreateTransformNode(); // the parent
+    SceneNodeAddChild(model_parent, camera_parent); // attached to the model parent
+    // set camera parent offset
+    transformable = TC_CAST(camera_parent->entity, Transformable);
+    transform = transformable.tc->get_transform(transformable.data);
+    transform.translation = (Vector3){-3.f, 3.f, -10.f};
     transform.rotation = QuaternionFromEuler(7.5f * DEG2RAD, 0.f, 0.f);
     transformable.tc->set_transform(transformable.data, transform);
-
+    // create the camera and attach it to the dedicated transform node
     SceneNodeAddChild(camera_parent, CreateCameraNode());
-    SceneNodeAddChild(model_parent, CreateMeshRenderEntity("spacefighter.glb"));
-    SceneNodeAddChild(model_parent, CreateTestObject());
     return CreateScene(root);
 }
 

src/utils

@@ -1 +1 @@
-Subproject commit c4ec92fa82ab0bbee24f5c60ce36455a37d3696d
+Subproject commit af50174b71853f3ca887fc0e064e88258c412f2c