From 47a1dd5a041d7ccc766e38d4281e75c58f363c67 Mon Sep 17 00:00:00 2001
From: Mylloon <kennel.anri@tutanota.com>
Date: Mon, 8 May 2023 11:29:12 +0200
Subject: [PATCH] positional ligthing

---
 shaders/manif.vs | 12 ++++++++----
 src/manif.c      |  7 +++++--
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/shaders/manif.vs b/shaders/manif.vs
index f7ab19b..ddef811 100644
--- a/shaders/manif.vs
+++ b/shaders/manif.vs
@@ -5,10 +5,14 @@ layout(location = 1) in vec3 normal;
 
 out float intensite_eclairage;
 uniform mat4 proj, model, view;
+uniform vec4 lumpos;
 
 void main() {
-  vec3 Ld = normalize(vec3(0.0, -0.2, -1.0));
-  vec3 n = normalize(transpose(inverse(view * model)) * vec4(normal, 0.0)).xyz;
-  intensite_eclairage = clamp(dot(n, -Ld), 0.0, 1.0);
-  gl_Position = proj * view * model * vec4(pos, 1.0);
+  vec4 pos_model = model * vec4(pos, 1);
+  // vec3 soleil = normalize(vec3(0, -20, 0));
+  vec3 torche = normalize(pos_model.xyz - lumpos.xyz);
+  vec3 vec_normal = normalize(transpose(inverse(model)) * vec4(normal, 0)).xyz;
+
+  intensite_eclairage = clamp(dot(vec_normal, -(torche)), 0, 1);
+  gl_Position = proj * view * pos_model;
 }
diff --git a/src/manif.c b/src/manif.c
index 5ac2e0c..18e95a6 100644
--- a/src/manif.c
+++ b/src/manif.c
@@ -44,9 +44,12 @@ static void draw(void) {
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   glUseProgram(_pId);
 
-  const GLfloat couleur_plan[] = {0.3f, 0.3f, 0.3f, 1};
-  const GLfloat couleur_heros[] = {1, 1, 0, 1};
+  const GLfloat couleur_plan[] = {0.3f, 0.3f, 0.3f, 1},
+                couleur_heros[] = {1, 1, 0, 1}, lumpos[] = {-4, 0.5, 0, 1};
   GLint couleur_loc = glGetUniformLocation(_pId, "couleur");
+  GLint lum_loc = glGetUniformLocation(_pId, "lumpos");
+
+  glUniform4fv(lum_loc, 1, lumpos);
 
   gl4duBindMatrix(matrix_proj);
   gl4duLoadIdentityf();