add multiple lights to shaders

15 files changed, 1176 insertions, 74 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b48428d..41cb559 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,7 +9,7 @@ add_executable(honey_engine_demo demo.c)
 
 set(CMAKE_C_FLAGS "-g")
 
-add_library(honey src/honey.c src/camera.c src/error.c src/input.c src/mesh.c src/model.c src/primitives.c src/shader.c src/texture.c)
+add_library(honey src/honey.c src/camera.c src/error.c src/input.c src/light.c src/mesh.c src/model.c src/primitives.c src/shader.c src/texture.c)
 add_library(glad src/glad.c)
 add_library(stb_image src/stb_image.c)
 
diff --git a/cel.fs b/cel.fs
new file mode 100644
index 0000000..ef9cd6a
--- /dev/null
+++ b/cel.fs
@@ -0,0 +1,110 @@
+#version 330 core
+
+/* input from the vector shader */
+in vec3 in_normal;
+in vec2 in_texture_coordinate;
+in vec3 in_fragment_position;
+
+/* light uniforms */
+uniform vec3 ambient_color;
+
+struct point_light {
+  vec3 position; /* view position */
+
+  float constant;
+  float linear;
+  float quadratic;
+
+  vec3 color;
+};
+
+struct directional_light {
+  vec3 direction;
+  vec3 color;
+};
+
+#define MAX_POINT_LIGHTS 8
+#define MAX_DIRECTIONAL_LIGHTS 8
+
+uniform point_light point_lights[MAX_POINT_LIGHTS];
+uniform int n_point_lights;
+
+uniform directional_light directional_lights[MAX_DIRECTIONAL_LIGHTS];
+uniform int n_directional_lights;
+
+/* texture uniforms */
+uniform sampler2D tex;
+
+/* view matrix */
+uniform mat4 view;
+
+out vec4 fragment_color;
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+/* compute phong cel-shader intensity */
+float compute_light_intensity(vec3 normal, vec3 light_direction, vec3 view_direction) {
+  /* diffuse light */
+  float diffuse_intensity = max(dot(normal, light_direction), 0);
+  diffuse_intensity = smoothstep(0, 0.01, diffuse_intensity);
+
+  /* specular highlight */
+  vec3 reflection_direction = reflect(-light_direction, normal);
+  float specular_intensity = pow(max(dot(view_direction, reflection_direction), 0), 256);
+  specular_intensity = smoothstep(0.005, 0.01, specular_intensity);
+
+  return diffuse_intensity + specular_intensity;
+}
+
+/* compute directional light contribution */
+vec3 compute_directional_light(directional_light light, vec3 normal, vec3 view_direction) {
+  vec3 light_direction = -vec3(view * vec4(light.direction.xyz, 0.0));
+  return light.color * compute_light_intensity(normal, light_direction, view_direction);
+}
+
+/* compute point light contribution */
+vec3 compute_point_light(point_light light, vec3 normal, vec3 fragment_position, vec3 view_direction) {
+  vec3 light_position = vec3(view * vec4(light.position.xyz, 1.0));
+  vec3 light_direction = normalize(light_position - fragment_position);
+
+  float light_intensity = compute_light_intensity(normal, light_direction, view_direction);
+
+  /* attenuation */
+  float distance = length(light_position - fragment_position);
+  float attenuation = 1.0 / (light.constant +
+                             light.linear * distance +
+                             light.quadratic * distance * distance);
+
+  return attenuation * light.color * light_intensity;
+}
+
+void main()
+{
+  vec3 normal = normalize(in_normal);
+  vec3 view_direction = normalize(-in_fragment_position);
+  
+  vec3 point_light_contrib = vec3(0, 0, 0);
+  for (int i=0; i<n_point_lights; i++) {
+    point_light_contrib += compute_point_light(point_lights[i],
+                                               normal,
+                                               in_fragment_position,
+                                               view_direction);
+  }
+
+  vec3 directional_light_contrib = vec3(0,0,0);
+  for (int i=0; i<n_directional_lights; i++) {
+    directional_light_contrib += compute_directional_light(directional_lights[i],
+                                                           normal,
+                                                           view_direction);
+  }
+  
+  /* rim lighting */
+  /*float rim_amount = 0.716;
+  float rim_threshold = 0.5;
+  float rim_norm = 1 - dot(normal, view_direction);
+  rim_intensity = smoothstep(rim_amount - 0.01, rim_amount + 0.01, rim_intensity);
+  vec3 rim_light = rim_intensity * ambient_color;*/
+
+  vec4 total_light = vec4((ambient_color + point_light_contrib + directional_light_contrib).xyz, 1.0);
+  fragment_color = total_light * texture(tex, in_texture_coordinate); 
+}              
diff --git a/demo.c b/demo.c
index f3423d9..3c2b408 100644
--- a/demo.c
+++ b/demo.c
@@ -10,16 +10,12 @@ float cameraSpeed = 3.0;
 float camera_roll_speed = 1.0;
 const float cameraMouseSensitivity = 0.1;
 
-honey_mesh cube;
-mat4 model;
-honey_shader cube_shader;
-honey_texture container;
-honey_texture happy_face;
-
 honey_mesh light_cube;
-vec3 ambient_color = { 0, 0.2, 0.2 };
-vec3 light_color = { 1, 1, 1 };
-vec3 light_position = { 2, 2, 2 };
+vec3 ambient_color = { 0.3, 0.3, 0.3 };
+honey_point_light light;
+
+honey_directional_light sun;
+
 mat4 light_model;
 honey_shader light_shader;
 
@@ -27,6 +23,11 @@ honey_model suzanne;
 mat4 suzanne_model;
 honey_texture suzanne_tex;
 
+honey_model sphere;
+honey_shader sphere_shader;
+mat4 model;
+honey_texture sphere_tex;
+
 bool wireframe = false;
 
 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
@@ -76,8 +77,6 @@ void toggle_wireframe(void* data, int action) {
 void update(float dt) {
   glfwPollEvents();
 
-  //glm_rotate_x(model, glm_rad(10*dt), model);
-  
   if (honey_key_down(HONEY_KEY_ESCAPE)) {
     glfwSetWindowShouldClose(window, true);
   }
@@ -118,23 +117,22 @@ void draw() {
   }
 
   honey_camera_calculate_view(&camera);
-  honey_shader_set_mat4(cube_shader, "view", camera.view);
-  honey_shader_set_mat4(cube_shader, "model", model);
+  honey_shader_set_mat4(sphere_shader, "view", camera.view);
+  honey_shader_set_mat4(sphere_shader, "model", model);
   mat4 normal4;
   mat3 normal;
   glm_mat4_copy(model, normal4);
   glm_mat4_inv_fast(normal4, normal4);
   glm_mat4_pick3t(normal4, normal);
-  honey_shader_set_mat3(cube_shader, "normal_mat", normal);
+  honey_shader_set_mat3(sphere_shader, "normal_mat", normal);
 
   honey_shader_set_mat4(light_shader, "view", camera.view);    
   honey_shader_set_mat4(light_shader, "model", light_model);
     
-  honey_texture_use(suzanne_tex, 0);
-  honey_texture_use(happy_face, 1);
+  honey_texture_use(sphere_tex, 0);
 
-  //honey_mesh_draw(cube, cube_shader);
-  honey_model_draw(&suzanne, cube_shader);
+  //honey_mesh_draw(cube, sphere_shader);
+  honey_model_draw(&sphere, sphere_shader);
   honey_mesh_draw(light_cube, light_shader);
     
   glfwSwapBuffers(window);
@@ -150,19 +148,11 @@ int main() {
 
   honey_key_bind(HONEY_KEY_F, toggle_wireframe, NULL);
 
-  /* load container texture */
-  if (honey_texture_new(&container, "container.jpg", false) != TEXTURE_OK) {
-    return 1;
-  }
-
-  /* load happy face texture */
-  if (honey_texture_new(&happy_face, "happy.png", true) != TEXTURE_OK) {
-    return 1;
-  }
-
-  honey_texture_new(&suzanne_tex, "Suzanne-tex.png", true);
+  /* load model */
+  honey_texture_new(&sphere_tex, "sphere-tex.png", true);
+  honey_model_load(&sphere, "sphere.obj");
   
-  honey_error result = honey_shader_load(&cube_shader, "demo.vs", "demo.fs");
+  honey_error result = honey_shader_load(&sphere_shader, "demo.vs", "cel.fs");
   if (result != HONEY_OK) {
     char error_message[3*HONEY_ERROR_DATA_STRING_LENGTH];
     honey_human_readable_error(error_message, result);
@@ -170,29 +160,17 @@ int main() {
     return 1;
   }
 
-  if (honey_shader_load(&light_shader, "light.vs", "light.fs") != HONEY_OK) {
-    return 1;
-  }
+  honey_shader_load(&light_shader, "light.vs", "light.fs");
 
-  if (honey_mesh_new_textured_cube(&cube, 1, 1, 1) != MESH_OK) {
-    fprintf(stderr, "Failed to load cube\n");
-    return 1;
-  }
+  honey_mesh_new_cube(&light_cube, 0.1,0.1,0.1);
 
-  if (honey_mesh_new_cube(&light_cube, 0.1, 0.1, 0.1) != MESH_OK) {
-    return 1;
-  }
+  sun.direction[0] = 0;
+  sun.direction[1] = -1;
+  sun.direction[0] = 0;
 
-  result = honey_model_load(&suzanne, "Suzanne.obj");
-  if (result != HONEY_OK) {
-    char error_message[3*HONEY_ERROR_DATA_STRING_LENGTH];
-    honey_human_readable_error(error_message, result);
-    fprintf(stderr, "%s\n", error_message);
-    return 1;
-  }
-
-  glm_mat4_identity(light_model);
-  glm_translate(light_model, light_position);
+  sun.color[0] = 1;
+  sun.color[1] = 1;
+  sun.color[2] = 1;
 
   glm_mat4_identity(model);
 
@@ -208,25 +186,37 @@ int main() {
                                camera_aspect_ratio,
                                camera_near, camera_far,
                                camera_fov);
-  /* set cube_shader uniforms */
-  honey_shader_set_int(cube_shader, "box_texture", 0);
-  honey_shader_set_int(cube_shader, "happy_texture", 1);
-  honey_shader_set_vec3(cube_shader, "light_color", light_color);
-  honey_shader_set_vec3(cube_shader, "light_position", light_position);
-  honey_shader_set_vec3(cube_shader, "ambient_color", ambient_color);
-
-  honey_shader_set_mat4(cube_shader, "model", model);
+
+  /* set sphere_shader uniforms */
+  honey_shader_set_int(sphere_shader, "tex", 0);
+
+  honey_shader_set_int (sphere_shader, "n_point_lights", 1);
+  honey_shader_set_int (sphere_shader, "n_directional_lights", 1);
+  
+  honey_point_light_new(&light,
+                        2, 2, 2,   /* position */
+                        1, 1, 1,   /* color */
+                        1, 0, 0);  /* attenuation */
+
+  glm_mat4_identity(light_model);
+  glm_translate(light_model, light.position);
+
+  honey_shader_set_point_light(sphere_shader, 0, light);
+  honey_shader_set_directional_light(sphere_shader, 0, sun);
+  honey_shader_set_vec3(sphere_shader, "ambient_color", ambient_color);
+
+  honey_shader_set_mat4(sphere_shader, "model", model);
   mat4 normal4;
   mat3 normal;
   glm_mat4_copy(model, normal4);
   glm_mat4_inv_fast(normal4, normal4);
   glm_mat4_pick3t(normal4, normal);
-  honey_shader_set_mat3(cube_shader, "normal_mat", normal);
-  honey_shader_set_mat4(cube_shader, "view", camera.view);
-  honey_shader_set_mat4(cube_shader, "projection", camera.projection);
+  honey_shader_set_mat3(sphere_shader, "normal_mat", normal);
+  honey_shader_set_mat4(sphere_shader, "view", camera.view);
+  honey_shader_set_mat4(sphere_shader, "projection", camera.projection);
 
   /* set light_shader uniforms */
-  honey_shader_set_vec3(light_shader, "light_color", light_color);
+  honey_shader_set_vec3(light_shader, "light_color", light.color);
 
   honey_shader_set_mat4(light_shader, "model", light_model);
   honey_shader_set_mat4(light_shader, "view", camera.view);
@@ -241,9 +231,11 @@ int main() {
 
   honey_run(window);
 
-  honey_mesh_delete(cube);
-  honey_model_delete(&suzanne);
-  honey_shader_delete(cube_shader);
+  honey_model_delete(&sphere);
+  honey_shader_delete(sphere_shader);
+
+  honey_mesh_delete(light_cube);
+  honey_shader_delete(light_shader);
 
   honey_quit();
 
diff --git a/demo.vs b/demo.vs
index c1ec38f..ba1a83d 100644
--- a/demo.vs
+++ b/demo.vs
@@ -1,11 +1,11 @@
 #version 330 core
 layout (location = 0) in vec3 position;
-layout (location = 1) in vec3 in_normal;
+layout (location = 1) in vec3 normal;
 layout (location = 2) in vec2 texCoord;
 
-out vec2 texture_coordinate;
-out vec3 normal;
-out vec3 fragment_position;
+out vec2 in_texture_coordinate;
+out vec3 in_normal;
+out vec3 in_fragment_position;
 
 uniform mat4 model;
 uniform mat3 normal_mat;
@@ -15,7 +15,7 @@ uniform mat4 projection;
 void main()
 {
   gl_Position = projection * view * model * vec4(position.xyz, 1.0);
-  texture_coordinate = texCoord;
-  normal = mat3(view) * normal_mat * in_normal;
-  fragment_position = vec3(view * model * vec4(position.xyz, 1.0));
+  in_texture_coordinate = texCoord;
+  in_normal = mat3(view) * normal_mat * normal;
+  in_fragment_position = vec3(view * model * vec4(position.xyz, 1.0));
 }
\ No newline at end of file
diff --git a/include/common.h b/include/common.h
index 83934ac..680f097 100644
--- a/include/common.h
+++ b/include/common.h
@@ -42,7 +42,7 @@ typedef enum {
   
   HONEY_N_ERRORS } honey_error;
 
-#define HONEY_ERROR_DATA_STRING_LENGTH 512
+#define HONEY_ERROR_DATA_STRING_LENGTH 4096
 
 static struct {
   char string1[HONEY_ERROR_DATA_STRING_LENGTH];
diff --git a/include/honey.h b/include/honey.h
index 1d45195..77dd678 100644
--- a/include/honey.h
+++ b/include/honey.h
@@ -9,6 +9,7 @@
 #include "camera.h"
 #include "common.h"
 #include "input.h"
+#include "light.h"
 #include "mesh.h"
 #include "model.h"
 #include "primitives.h"
diff --git a/include/light.h b/include/light.h
new file mode 100644
index 0000000..93fcfd1
--- /dev/null
+++ b/include/light.h
@@ -0,0 +1,33 @@
+#ifndef HONEY_LIGHT_H
+#define HONEY_LIGHT_H
+
+#include "common.h"
+
+#define HONEY_MAX_LIGHT_NAME_LENGTH 64
+
+typedef struct {
+  vec3 position;
+  vec3 color;
+
+  float constant;
+  float linear;
+  float quadratic;
+} honey_point_light;
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+typedef struct {
+  vec3 direction;
+  vec3 color;
+} honey_directional_light;
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_point_light_new(honey_point_light* light,
+                           float x, float y, float z,
+                           float r, float g, float b,
+                           float constant,
+                           float linear,
+                           float quadratic);
+
+#endif
diff --git a/include/shader.h b/include/shader.h
index 9a567f5..b502137 100644
--- a/include/shader.h
+++ b/include/shader.h
@@ -7,6 +7,7 @@
 #define HONEY_SHADER_H
 
 #include "common.h"
+#include "light.h"
 
 typedef int honey_shader;
 
@@ -85,6 +86,26 @@ void honey_shader_set_mat4(honey_shader shader,
                            char* matrix_name,
                            mat4 value);
 
+/** @brief Set a point_light uniform.
+ *
+ * @param[in] shader The shader to which the uniform belongs
+ * @param[in] point_light_index The index of the light to set
+ * @param[in] light The honey_point_light to set
+ */
+void honey_shader_set_point_light(honey_shader shader,
+                                  int point_light_index,
+                                  honey_point_light light);
+
+/** @brief Set a directional_light uniform.
+ *
+ * @param[in] shader The shader to which the uniform belongs
+ * @param[in] directional_light_index The index of the light to set
+ * @param[in] light The honey_directional_light to set
+ */
+void honey_shader_set_directional_light(honey_shader shader,
+                                      int directional_light_index,
+                                      honey_directional_light light);
+
 /** @brief Use a shader.
  */
 #define honey_shader_use glUseProgram
diff --git a/sphere-tex.png b/sphere-tex.png
new file mode 100644
index 0000000..1d12d94
--- /dev/null
+++ b/sphere-tex.png
diff --git a/sphere-tex.xcf b/sphere-tex.xcf
new file mode 100644
index 0000000..01b0d9f
--- /dev/null
+++ b/sphere-tex.xcf
diff --git a/sphere.mtl b/sphere.mtl
new file mode 100644
index 0000000..7e07cb8
--- /dev/null
+++ b/sphere.mtl
@@ -0,0 +1,13 @@
+# Blender MTL File: 'None'
+# Material Count: 1
+
+newmtl Material.002
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd sphere-tex.png
diff --git a/sphere.obj b/sphere.obj
new file mode 100644
index 0000000..eaa13c6
--- /dev/null
+++ b/sphere.obj
@@ -0,0 +1,855 @@
+# Blender v2.82 (sub 7) OBJ File: ''
+# www.blender.org
+mtllib sphere.mtl
+o Icosphere
+v 0.000000 -1.000000 0.000000
+v 0.723607 -0.447220 0.525725
+v -0.276388 -0.447220 0.850649
+v -0.894426 -0.447216 0.000000
+v -0.276388 -0.447220 -0.850649
+v 0.723607 -0.447220 -0.525725
+v 0.276388 0.447220 0.850649
+v -0.723607 0.447220 0.525725
+v -0.723607 0.447220 -0.525725
+v 0.276388 0.447220 -0.850649
+v 0.894426 0.447216 0.000000
+v 0.000000 1.000000 0.000000
+v -0.232822 -0.657519 0.716563
+v -0.162456 -0.850654 0.499995
+v -0.077607 -0.967950 0.238853
+v 0.203181 -0.967950 0.147618
+v 0.425323 -0.850654 0.309011
+v 0.609547 -0.657519 0.442856
+v 0.531941 -0.502302 0.681712
+v 0.262869 -0.525738 0.809012
+v -0.029639 -0.502302 0.864184
+v 0.812729 -0.502301 -0.295238
+v 0.850648 -0.525736 0.000000
+v 0.812729 -0.502301 0.295238
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+v -0.525730 -0.850652 0.000000
+v -0.251147 -0.967949 0.000000
+v -0.483971 -0.502302 0.716565
+v -0.688189 -0.525736 0.499997
+v -0.831051 -0.502299 0.238853
+v -0.232822 -0.657519 -0.716563
+v -0.162456 -0.850654 -0.499995
+v -0.077607 -0.967950 -0.238853
+v -0.831051 -0.502299 -0.238853
+v -0.688189 -0.525736 -0.499997
+v -0.483971 -0.502302 -0.716565
+v -0.029639 -0.502302 -0.864184
+v 0.262869 -0.525738 -0.809012
+v 0.531941 -0.502302 -0.681712
+v 0.956626 0.251149 0.147618
+v 0.951058 -0.000000 0.309013
+v 0.860698 -0.251151 0.442858
+v 0.860698 -0.251151 -0.442858
+v 0.951058 0.000000 -0.309013
+v 0.956626 0.251149 -0.147618
+v 0.155215 0.251152 0.955422
+v 0.000000 -0.000000 1.000000
+v -0.155215 -0.251152 0.955422
+v 0.687159 -0.251152 0.681715
+v 0.587786 0.000000 0.809017
+v 0.436007 0.251152 0.864188
+v -0.860698 0.251151 0.442858
+v -0.951058 -0.000000 0.309013
+v -0.956626 -0.251149 0.147618
+v -0.436007 -0.251152 0.864188
+v -0.587786 0.000000 0.809017
+v -0.687159 0.251152 0.681715
+v -0.687159 0.251152 -0.681715
+v -0.587786 -0.000000 -0.809017
+v -0.436007 -0.251152 -0.864188
+v -0.956626 -0.251149 -0.147618
+v -0.951058 0.000000 -0.309013
+v -0.860698 0.251151 -0.442858
+v 0.436007 0.251152 -0.864188
+v 0.587786 -0.000000 -0.809017
+v 0.687159 -0.251152 -0.681715
+v -0.155215 -0.251152 -0.955422
+v 0.000000 0.000000 -1.000000
+v 0.155215 0.251152 -0.955422
+v 0.831051 0.502299 0.238853
+v 0.688189 0.525736 0.499997
+v 0.483971 0.502302 0.716565
+v 0.029639 0.502302 0.864184
+v -0.262869 0.525738 0.809012
+v -0.531941 0.502302 0.681712
+v -0.812729 0.502301 0.295238
+v -0.850648 0.525736 0.000000
+v -0.812729 0.502301 -0.295238
+v -0.531941 0.502302 -0.681712
+v -0.262869 0.525738 -0.809012
+v 0.029639 0.502302 -0.864184
+v 0.483971 0.502302 -0.716565
+v 0.688189 0.525736 -0.499997
+v 0.831051 0.502299 -0.238853
+v 0.077607 0.967950 0.238853
+v 0.162456 0.850654 0.499995
+v 0.232822 0.657519 0.716563
+v 0.753442 0.657515 0.000000
+v 0.525730 0.850652 0.000000
+v 0.251147 0.967949 0.000000
+v -0.203181 0.967950 0.147618
+v -0.425323 0.850654 0.309011
+v -0.609547 0.657519 0.442856
+v -0.203181 0.967950 -0.147618
+v -0.425323 0.850654 -0.309011
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diff --git a/sphere.png b/sphere.png
new file mode 100644
index 0000000..ea6b0cd
--- /dev/null
+++ b/sphere.png
diff --git a/src/light.c b/src/light.c
new file mode 100644
index 0000000..08da8e6
--- /dev/null
+++ b/src/light.c
@@ -0,0 +1,20 @@
+#include "../include/light.h"
+
+void honey_point_light_new(honey_point_light* light,
+                           float x, float y, float z,
+                           float r, float g, float b,
+                           float constant,
+                           float linear,
+                           float quadratic) {
+  light->position[0] = x;
+  light->position[1] = y;
+  light->position[2] = z;
+  
+  light->color[0] = r;
+  light->color[1] = g;
+  light->color[2] = b;
+
+  light->constant = constant;
+  light->linear = linear;
+  light->quadratic = quadratic;
+}
diff --git a/src/shader.c b/src/shader.c
index d250629..d570f52 100644
--- a/src/shader.c
+++ b/src/shader.c
@@ -164,4 +164,61 @@ void honey_shader_set_mat4(honey_shader shader,
 }
 
 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_shader_set_point_light(honey_shader shader,
+                                  int point_light_index,
+                                  honey_point_light light) {
+  char name[HONEY_MAX_LIGHT_NAME_LENGTH];
+
+  snprintf(name,
+           HONEY_MAX_LIGHT_NAME_LENGTH,
+           "point_lights[%d].position",
+           point_light_index);
+  honey_shader_set_vec3(shader, name, light.position);
+  
+  snprintf(name,
+           HONEY_MAX_LIGHT_NAME_LENGTH,
+           "point_lights[%d].color",
+           point_light_index);
+  honey_shader_set_vec3(shader, name, light.color);
+    
+  snprintf(name,
+           HONEY_MAX_LIGHT_NAME_LENGTH,
+           "point_lights[%d].constant",
+           point_light_index);
+  honey_shader_set_float(shader, name, light.constant);
+
+  snprintf(name,
+           HONEY_MAX_LIGHT_NAME_LENGTH,
+           "point_lights[%d].linear",
+           point_light_index);
+  honey_shader_set_float(shader, name, light.linear);
+
+  snprintf(name,
+           HONEY_MAX_LIGHT_NAME_LENGTH,
+           "point_lights[%d].quadratic",
+           point_light_index);
+  honey_shader_set_float(shader, name, light.quadratic);
+}
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
+
+void honey_shader_set_directional_light(honey_shader shader,
+                                        int directional_light_index,
+                                        honey_directional_light light) {
+  char name[HONEY_MAX_LIGHT_NAME_LENGTH];
+  
+  snprintf(name,
+           HONEY_MAX_LIGHT_NAME_LENGTH,
+           "directional_lights[%d].direction",
+           directional_light_index);
+  honey_shader_set_vec3(shader, name, light.direction);
+
+  snprintf(name,
+           HONEY_MAX_LIGHT_NAME_LENGTH,
+           "directional_lights[%d].color",
+           directional_light_index);
+  honey_shader_set_vec3(shader, name, light.color);
+}
+