loading animation data - step 1

8 files changed, 190 insertions, 38 deletions

diff --git a/src/animation.c b/src/animation.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/animation.c
diff --git a/src/animation.h b/src/animation.h
new file mode 100644
index 0000000..b7c8ca4
--- /dev/null
+++ b/src/animation.h
@@ -0,0 +1,53 @@
+#pragma once
+
+#include "darray.h"
+#include "defines.h"
+#include "maths_types.h"
+
+KITC_DECL_TYPED_ARRAY(f32)
+
+typedef enum interpolation { INTERPOLATION_LINEAR, INTERPOLATION_COUNT } interpolation;
+
+typedef enum keyframe_kind {
+  KEYFRAME_ROTATION,
+  KEYFRAME_TRANSLATION,
+  KEYFRAME_SCALE,
+  KEYFRAME_WEIGHTS,
+} keyframe_kind;
+
+typedef union keyframe {
+  quat rotation;
+  vec3 translation;
+  vec3 scale;
+  float* weights;
+} keyframe;
+
+typedef struct keyframes {
+  keyframe_kind kind;
+  keyframe* values;
+  size_t count;
+} keyframes;
+
+typedef struct animation_spline {
+  f32_darray timestamps;
+  keyframes values;
+  interpolation interpolation;
+} animation_spline;
+
+typedef struct animation_sampler {
+  int current_index;
+  animation_spline animation;
+} animation_sampler;
+
+/** @brief Sample an animation at a given time `t` */
+keyframe animation_sample(animation_sampler sampler, f32 t);
+
+typedef struct animation_clip {
+  // A clip contains one or more animation curves
+  // for now I think we can just enumerate all of the properties (assuming *only* one per type is in
+  // a clip) NULL = this property is not animated in this clip
+  animation_sampler* rotation;
+  animation_sampler* translation;
+  animation_sampler* scale;
+  animation_sampler* weights;
+} animation_clip;
\ No newline at end of file
diff --git a/src/maths/primitives.h b/src/maths/primitives.h
index b7fefa0..ed52c8c 100644
--- a/src/maths/primitives.h
+++ b/src/maths/primitives.h
@@ -34,38 +34,48 @@ static mesh prim_cube_mesh_create() {
       (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_NEG_Z, .uv = (vec2){ 1, 0 } });
   vertex_darray_push(
       cube.vertices,
-      (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_NEG_Z, .uv = (vec2){ 1,1 } });
+      (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_NEG_Z, .uv = (vec2){ 1, 1 } });
   vertex_darray_push(
       cube.vertices,
       (vertex){ .position = BACK_BOT_LEFT, .normal = VEC3_NEG_Z, .uv = (vec2){ 0, 1 } });
 
   // front faces
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_BOT_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 1} });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 0 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_TOP_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 0} });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_BOT_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 1 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 1 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 0 } });
 
   // top faces
   vertex_darray_push(cube.vertices,
                      (vertex){ .position = BACK_TOP_LEFT, .normal = VEC3_Y, .uv = (vec2){ 0, 0 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_TOP_LEFT, .normal = VEC3_Y, .uv = (vec2){ 0, 1 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_LEFT, .normal = VEC3_Y, .uv = (vec2){ 0, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 1 } });
   vertex_darray_push(cube.vertices,
                      (vertex){ .position = BACK_TOP_LEFT, .normal = VEC3_Y, .uv = (vec2){ 0, 0 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 1 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 0 } });
 
   // bottom faces
   vertex_darray_push(
@@ -88,18 +98,24 @@ static mesh prim_cube_mesh_create() {
       (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_NEG_Y, .uv = (vec2){ 0 } });
 
   // right faces
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 0 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1, 1 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1, 0 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1,1 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 0 } });
-  vertex_darray_push(cube.vertices,
-                     (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 1 } });
 
   // left faces
   vertex_darray_push(
diff --git a/src/renderer/backends/backend_opengl.c b/src/renderer/backends/backend_opengl.c
index 8df0933..b769002 100644
--- a/src/renderer/backends/backend_opengl.c
+++ b/src/renderer/backends/backend_opengl.c
@@ -42,9 +42,7 @@ bool gfx_backend_init(renderer *ren) {
   return true;
 }
 
-void gfx_backend_draw_frame(renderer* ren, camera* cam, mat4 model, texture* tex) {
-  
-}
+void gfx_backend_draw_frame(renderer *ren, camera *cam, mat4 model, texture *tex) {}
 
 void gfx_backend_shutdown(renderer *ren) {}
 
diff --git a/src/renderer/render.c b/src/renderer/render.c
index 2993225..2f5e553 100644
--- a/src/renderer/render.c
+++ b/src/renderer/render.c
@@ -1,3 +1,4 @@
+#include "mem.h"
 #define STB_IMAGE_IMPLEMENTATION
 #include <stb_image.h>
 
@@ -88,6 +89,21 @@ void default_material_init() {
   texture_data_upload(&DEFAULT_MATERIAL.specular_texture);
 }
 
+void model_destroy(model* model) {
+  arena_free_all(&model->animation_data_arena);
+  arena_free_storage(&model->animation_data_arena);
+  mesh_darray_free(model->meshes);
+  material_darray_free(model->materials);
+  if (model->is_uploaded) {
+    // Delete gpu buffer data
+    for (u32 i = 0; i < mesh_darray_len(model->meshes); i++) {
+      // FIXME: dont leak Opengl
+      glDeleteBuffers(1, &model->meshes->data[i].vbo);
+      glDeleteVertexArrays(1, &model->meshes->data[i].vao);
+    }
+  }
+}
+
 void draw_model(renderer* ren, camera* camera, model* model, transform tf, scene* scene) {
   // TRACE("Drawing model: %s", model->name);
   mat4 view;
diff --git a/src/renderer/render.h b/src/renderer/render.h
index b6dad00..f0118b6 100644
--- a/src/renderer/render.h
+++ b/src/renderer/render.h
@@ -35,5 +35,7 @@ void model_upload_meshes(renderer* ren, model* model);
 void draw_model(renderer* ren, camera* camera, model* model, transform tf, scene* scene);
 void draw_mesh(renderer* ren, mesh* mesh, transform tf, material* mat, mat4* view, mat4* proj);
 
+void model_destroy(model* model);
+
 // ---
 texture texture_data_load(const char* path, bool invert_y);  // #frontend
diff --git a/src/renderer/render_types.h b/src/renderer/render_types.h
index 80e1372..8d12183 100644
--- a/src/renderer/render_types.h
+++ b/src/renderer/render_types.h
@@ -7,6 +7,7 @@
  */
 #pragma once
 
+#include "animation.h"
 #include "darray.h"
 #include "maths.h"
 #include "maths_types.h"
@@ -52,8 +53,8 @@ typedef struct renderer {
 typedef struct texture {
   u32 texture_id;
   char name[MAX_TEXTURE_NAME_LEN];
-  void* image_data;
-  void* backend_data;
+  void *image_data;
+  void *backend_data;
   u32 width;
   u32 height;
   u8 channel_count;
@@ -84,6 +85,11 @@ KITC_DECL_TYPED_ARRAY(material)  // creates "material_darray"
 #define TYPED_MATERIAL_ARRAY
 #endif
 
+#ifndef TYPED_ANIMATION_CLIP_ARRAY
+KITC_DECL_TYPED_ARRAY(animation_clip)  // creates "material_darray"
+#define TYPED_ANIMATION_CLIP_ARRAY
+#endif
+
 // lights
 typedef struct point_light {
   vec3 position;
@@ -137,6 +143,8 @@ typedef struct model {
   mesh_darray *meshes;
   aabb_3d bbox;
   material_darray *materials;
+  animation_clip_darray *animations;
+  arena animation_data_arena;
   bool is_loaded;
   bool is_uploaded;
 } model;
diff --git a/src/resources/gltf.c b/src/resources/gltf.c
index 261c96f..b6e100f 100644
--- a/src/resources/gltf.c
+++ b/src/resources/gltf.c
@@ -1,11 +1,13 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
+#include "animation.h"
 #include "core.h"
 #include "defines.h"
 #include "file.h"
 #include "loaders.h"
 #include "log.h"
+#include "mem.h"
 #include "path.h"
 #include "render.h"
 #include "render_types.h"
@@ -228,6 +230,63 @@ bool model_load_gltf_str(const char *file_string, const char *filepath, str8 rel
     printf("Mesh %d Mat index %d Mat name %s\n", i, mat_idx,
            out_model->materials->data[mat_idx].name);
   }
+
+  // Animations
+  TRACE("Num animations %d", data->animations_count);
+  size_t num_animations = data->animations_count;
+  if (num_animations > 0) {
+// Create an arena for all animation related data
+#define ANIMATION_STORAGE_ARENA_SIZE (1024 * 1024)
+    char *animation_backing_storage = malloc(ANIMATION_STORAGE_ARENA_SIZE);
+    // We'll store data on this arena so we can easily free it all at once later
+    arena anim_arena = arena_create(animation_backing_storage, ANIMATION_STORAGE_ARENA_SIZE);
+
+    if (!out_model->animations) {
+      out_model->animations = animation_clip_darray_new(num_animations);
+    }
+
+    for (int anim_idx = 0; anim_idx < data->animations_count; anim_idx++) {
+      cgltf_animation animation = data->animations[anim_idx];
+      animation_clip clip = { 0 };
+
+      for (size_t c = 0; c < animation.channels_count; c++) {
+        cgltf_animation_channel channel = animation.channels[c];
+
+        animation_sampler *sampler = arena_alloc(&anim_arena, sizeof(animation_sampler));
+
+        animation_sampler **target_property;
+        keyframe_kind data_type;
+
+        switch (channel.target_path) {
+          case cgltf_animation_path_type_rotation:
+            target_property = &clip.rotation;
+            data_type = KEYFRAME_ROTATION;
+            break;
+          default:
+            WARN("unsupported animation type");
+            return false;
+        }
+        *target_property = sampler;
+
+        sampler->current_index = 0;
+        sampler->animation.interpolation = INTERPOLATION_LINEAR;
+
+        // keyframe times
+        size_t n_frames = channel.sampler->input->count;
+        assert(channel.sampler->input->component_type == cgltf_component_type_r_32f);
+        // FIXME: CASSERT_MSG function "Expected animation sampler input component to be type f32 (keyframe times)");
+        
+        sampler,
+        
+        // keyframe values
+        size_t n_values = channel.sampler->output->count;
+        assert(n_frames == n_values);
+
+        sampler->animation.timestamps
+      }
+    }
+  }
+
   return true;
 }