phong!

shaders/manif.fs

@@ -1,10 +1,15 @@
 #version 330
 
-in float intensite_eclairage;
+in vec4 pos_model;
+in vec3 vec_normal;
+
 out vec4 fragColor;
 
 uniform vec4 couleur;
+uniform vec4 lumpos;
 
 void main() {
+  vec3 torche = normalize(pos_model.xyz - lumpos.xyz);
+  float intensite_eclairage = clamp(dot(vec_normal, -torche), 0, 1);
   fragColor = intensite_eclairage * couleur;
 }

shaders/manif.vs

@@ -3,16 +3,14 @@
 layout(location = 0) in vec3 pos;
 layout(location = 1) in vec3 normal;
 
-out float intensite_eclairage;
+out vec4 pos_model;
+out vec3 vec_normal;
+
 uniform mat4 proj, model, view;
-uniform vec4 lumpos;
 
 void main() {
-  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;
+  pos_model = model * vec4(pos, 1);
+  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;
 }

src/manif.c

@@ -45,10 +45,11 @@ static void draw(void) {
   glUseProgram(_pId);
 
   const GLfloat couleur_plan[] = {0.3f, 0.3f, 0.3f, 1},
-                couleur_heros[] = {1, 1, 0, 1}, lumpos[] = {-4, 0.5, 0, 1};
+                couleur_heros[] = {1, 1, 0, 1};
   GLint couleur_loc = glGetUniformLocation(_pId, "couleur");
-  GLint lum_loc = glGetUniformLocation(_pId, "lumpos");
 
+  const GLfloat lumpos[] = {1, 2, 3, 1};
+  GLint lum_loc = glGetUniformLocation(_pId, "lumpos");
   glUniform4fv(lum_loc, 1, lumpos);
 
   gl4duBindMatrix(matrix_proj);