lights, camera, action

4 files changed, 91 insertions, 16 deletions

diff --git a/src/renderer/render.c b/src/renderer/render.c
index dc541d2..1c979e5 100644
--- a/src/renderer/render.c
+++ b/src/renderer/render.c
@@ -80,7 +80,7 @@ void default_material_init() {
   texture_data_upload(&DEFAULT_MATERIAL.specular_texture);
 }
 
-void draw_model(renderer* ren, camera* camera, model* model, transform tf) {
+void draw_model(renderer* ren, camera* camera, model* model, transform tf, scene* scene) {
   // TRACE("Drawing model: %s", model->name);
   mat4 view;
   mat4 proj;
@@ -88,13 +88,22 @@ void draw_model(renderer* ren, camera* camera, model* model, transform tf) {
 
   set_shader(ren->blinn_phong);
 
+  // set camera uniform
+  uniform_vec3f(ren->blinn_phong.program_id, "viewPos", &camera->position);
+  // set light uniforms
+  dir_light_upload_uniforms(ren->blinn_phong, &scene->dir_light);
+  for (int i = 0; i < scene->n_point_lights; i ++) {
+    point_light_upload_uniforms(ren->blinn_phong, &scene->point_lights[i], '0' + i);
+  }
+
   for (size_t i = 0; i < mesh_darray_len(model->meshes); i++) {
     mesh* m = &model->meshes->data[i];
     if (vertex_darray_len(m->vertices) == 0) {
       continue;
     }
     // TRACE("Drawing mesh %d", i);
-    draw_mesh(ren, m, tf, &(DEFAULT_MATERIAL), &view, &proj);
+    material* mat = &model->materials->data[m->material_index];
+    draw_mesh(ren, m, tf, mat, &view, &proj);
   }
 }
 
@@ -127,8 +136,6 @@ void draw_mesh(renderer* ren, mesh* mesh, transform tf, material* mat, mat4* vie
 
 void model_upload_meshes(renderer* ren, model* model) {
   INFO("Upload mesh vertex data to GPU for model %s", model->name);
-  // DEBUG("Loading model with handle %d", model_handle.raw);
-  // model m = models->data[model_handle.raw];
 
   size_t num_meshes = mesh_darray_len(model->meshes);
   u32 VBOs[num_meshes];
@@ -148,7 +155,7 @@ void model_upload_meshes(renderer* ren, model* model) {
     glBindBuffer(GL_ARRAY_BUFFER, VBOs[mesh_i]);
 
     size_t num_vertices = vertex_darray_len(model->meshes->data[mesh_i].vertices);
-    TRACE("Uploading vertex array data: %d verts", num_vertices);
+    // TRACE("Uploading vertex array data: %d verts", num_vertices);
     total_verts += num_vertices;
 
     // TODO: convert this garbage into a function
@@ -256,3 +263,34 @@ void texture_data_upload(texture* tex) {
   DEBUG("Freeing texture image data after uploading to GPU");
   // stbi_image_free(tex->image_data);  // data is on gpu now so we dont need it around
 }
+
+void dir_light_upload_uniforms(shader shader, directional_light *light) {
+  uniform_vec3f(shader.program_id, "dirLight.direction", &light->direction);
+  uniform_vec3f(shader.program_id, "dirLight.ambient", &light->ambient);
+  uniform_vec3f(shader.program_id, "dirLight.diffuse", &light->diffuse);
+  uniform_vec3f(shader.program_id, "dirLight.specular", &light->specular);
+}
+
+void point_light_upload_uniforms(shader shader, point_light *light, char index) {
+  char position_str[] = "pointLights[x].position";
+  position_str[12] = (char)index;
+  char ambient_str[] = "pointLights[x].ambient";
+  ambient_str[12] = (char)index;
+  char diffuse_str[] = "pointLights[x].diffuse";
+  diffuse_str[12] = (char)index;
+  char specular_str[] = "pointLights[x].specular";
+  specular_str[12] = (char)index;
+  char constant_str[] = "pointLights[x].constant";
+  constant_str[12] = (char)index;
+  char linear_str[] = "pointLights[x].linear";
+  linear_str[12] = (char)index;
+  char quadratic_str[] = "pointLights[x].quadratic";
+  quadratic_str[12] = (char)index;
+  uniform_vec3f(shader.program_id, position_str, &light->position);
+  uniform_vec3f(shader.program_id, ambient_str, &light->ambient);
+  uniform_vec3f(shader.program_id, diffuse_str, &light->diffuse);
+  uniform_vec3f(shader.program_id, specular_str, &light->specular);
+  uniform_f32(shader.program_id, constant_str, light->constant);
+  uniform_f32(shader.program_id, linear_str, light->linear);
+  uniform_f32(shader.program_id, quadratic_str, light->quadratic);
+}
\ No newline at end of file
diff --git a/src/renderer/render.h b/src/renderer/render.h
index 35c2d91..10702e3 100644
--- a/src/renderer/render.h
+++ b/src/renderer/render.h
@@ -17,7 +17,7 @@ void render_frame_end(renderer* ren);
 
 // --- models meshes
 void model_upload_meshes(renderer* ren, model* model);
-void draw_model(renderer* ren, camera* camera, model* model, transform tf);
+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);
 
 // ---
diff --git a/src/renderer/render_types.h b/src/renderer/render_types.h
index 746dfce..483e392 100644
--- a/src/renderer/render_types.h
+++ b/src/renderer/render_types.h
@@ -78,6 +78,27 @@ KITC_DECL_TYPED_ARRAY(material)  // creates "material_darray"
 #define TYPED_MATERIAL_ARRAY
 #endif
 
+// lights
+typedef struct point_light {
+  vec3 position;
+  f32 constant, linear, quadratic;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+} point_light;
+
+typedef struct directional_light {
+  vec3 direction;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+} directional_light;
+
+void point_light_upload_uniforms(shader shader, point_light *light, char index);
+void dir_light_upload_uniforms(shader shader, directional_light *light);
+
+// --- Models & Meshes
+
 /** @brief Vertex format for a static mesh */
 typedef struct vertex {
   vec3 position;
@@ -90,8 +111,6 @@ KITC_DECL_TYPED_ARRAY(vertex)  // creates "vertex_darray"
 #define TYPED_VERTEX_ARRAY
 #endif
 
-// --- Models & Meshes
-
 typedef struct mesh {
   vertex_darray *vertices;
   u32 vertex_size; /** size in bytes of each vertex including necessary padding */
@@ -121,6 +140,17 @@ KITC_DECL_TYPED_ARRAY(model)  // creates "model_darray"
 #define TYPED_MODEL_ARRAY
 #endif
 
+// --- Scene
+
+// NOTE: This struct won't stay like this for a long time. It's somewhat temporary
+//       in order to get a basic scene working without putting burden on the caller of
+//       draw_model()
+typedef struct scene {
+  directional_light dir_light;
+  point_light point_lights[4];
+  size_t n_point_lights;
+} scene;
+
 // --- Graphics API related
 
 typedef enum cel_primitive_topology {
diff --git a/src/resources/obj.c b/src/resources/obj.c
index 658967e..221e3aa 100644
--- a/src/resources/obj.c
+++ b/src/resources/obj.c
@@ -35,7 +35,7 @@ KITC_DECL_TYPED_ARRAY(face)
 void create_submesh(mesh_darray *meshes, vec3_darray *tmp_positions, vec3_darray *tmp_normals,
                     vec2_darray *tmp_uvs, face_darray *tmp_faces, material_darray *materials,
                     bool material_loaded, char current_material_name[256]);
-bool load_material_lib(const char *path, material_darray *materials);
+bool load_material_lib(const char *path, str8 relative_path, material_darray *materials);
 bool model_load_obj_str(const char *file_string, str8 relative_path, model *out_model,
                         bool invert_textures_y);
 
@@ -182,7 +182,7 @@ bool model_load_obj_str(const char *file_string, str8 relative_path, model *out_
         sscanf(pch + offset, "%s", filename);
         char mtllib_path[1024];
         snprintf(mtllib_path, sizeof(mtllib_path), "%s/%s", relative_path.buf, filename);
-        if (!load_material_lib(mtllib_path, out_model->materials)) {
+        if (!load_material_lib(mtllib_path, relative_path, out_model->materials)) {
           ERROR("couldnt load material lib");
           return false;
         }
@@ -262,7 +262,6 @@ void create_submesh(mesh_darray *meshes, vec3_darray *tmp_positions, vec3_darray
     material_darray_iter mat_iter = material_darray_iter_new(materials);
     blinn_phong_material *cur_material;
     while ((cur_material = material_darray_iter_next(&mat_iter))) {
-      printf("Material name %s vs %s \n", cur_material->name, current_material_name);
       if (strcmp(cur_material->name, current_material_name) == 0) {
         DEBUG("Found match");
         m.material_index = mat_iter.current_idx - 1;
@@ -280,7 +279,7 @@ void create_submesh(mesh_darray *meshes, vec3_darray *tmp_positions, vec3_darray
   mesh_darray_push(meshes, m);
 }
 
-bool load_material_lib(const char *path, material_darray *materials) {
+bool load_material_lib(const char *path,str8 relative_path, material_darray *materials) {
   TRACE("BEGIN load material lib at %s", path);
 
   const char *file_string = string_from_file(path);
@@ -338,9 +337,12 @@ bool load_material_lib(const char *path, material_darray *materials) {
       // specular exponent
       sscanf(pch + offset, "%f", &current_material.spec_exponent);
     } else if (strcmp(line_header, "map_Kd") == 0) {
-      char diffuse_map_path[1024] = "assets/";
-      sscanf(pch + offset, "%s", diffuse_map_path + 7);
+      char diffuse_map_filename[1024];
+      sscanf(pch + offset, "%s", diffuse_map_filename);
+      char diffuse_map_path[1024];
+      snprintf(diffuse_map_path, sizeof(diffuse_map_path), "%s/%s", relative_path.buf, diffuse_map_filename);
       printf("load from %s\n", diffuse_map_path);
+
       // --------------
       texture diffuse_texture = texture_data_load(diffuse_map_path, true);
       current_material.diffuse_texture = diffuse_texture;
@@ -348,8 +350,13 @@ bool load_material_lib(const char *path, material_darray *materials) {
       texture_data_upload(&current_material.diffuse_texture);
       // --------------
     } else if (strcmp(line_header, "map_Ks") == 0) {
-      char specular_map_path[1024] = "assets/";
-      sscanf(pch + offset, "%s", specular_map_path + 7);
+      // char specular_map_path[1024] = "assets/";
+      // sscanf(pch + offset, "%s", specular_map_path + 7);
+      char specular_map_filename[1024];
+      sscanf(pch + offset, "%s", specular_map_filename);
+      char specular_map_path[1024];
+      snprintf(specular_map_path, sizeof(specular_map_path), "%s/%s", relative_path.buf, specular_map_filename);
+      printf("load from %s\n", specular_map_path);
       // --------------
       texture specular_texture = texture_data_load(specular_map_path, true);
       current_material.specular_texture = specular_texture;