feat: add lights

src/material.cpp

@@ -1,14 +1,19 @@
 #include "material.h"
 
 #include "../lib/glm/glm.hpp"
+#include "../lib/glm/gtc/matrix_transform.hpp"
 
+#include "light.h"
 #include "shader.h"
 #include "state.h"
 #include "texture.h"
 
 Material::Material(const std::shared_ptr<Texture>& tex,
 		   const std::shared_ptr<Shader>&  shader)
-    : shader_(shader), texture_(tex)
+    : shader_(shader)
+    , texture_(tex)
+    , color_(1.0f, 1.0f, 1.0f, 1.0f)
+    , shininess_(0)
 {
 }
 
@@ -42,6 +47,39 @@ void Material::prepare()
 	const int mvp_loc = active_shader->uniform_location("mvp");
 	Shader::set_mat4(mvp_loc, mvp);
 
+	// Set ModelView matrix
+	const glm::mat4 model_view = state::view_matrix * state::model_matrix;
+	const int model_view_loc = active_shader->uniform_location("modelView");
+	Shader::set_mat4(model_view_loc, model_view);
+
+	// Set Normal matrix (transpose of inverse of ModelView)
+	const glm::mat4 normal_matrix =
+	    glm::transpose(glm::inverse(model_view));
+	const int normal_matrix_loc =
+	    active_shader->uniform_location("normalMatrix");
+	Shader::set_mat4(normal_matrix_loc, normal_matrix);
+
+	// Set material properties
+	const int material_color_loc =
+	    active_shader->uniform_location("materialColor");
+	Shader::set_vec4(material_color_loc, color_);
+
+	const int shininess_loc = active_shader->uniform_location("shininess");
+	Shader::set_float(shininess_loc, static_cast<float>(shininess_));
+
+	// Set ambient light
+	const int ambient_loc = active_shader->uniform_location("ambientLight");
+	Shader::set_vec3(ambient_loc, state::ambient);
+
+	// Set number of lights
+	const int num_lights_loc = active_shader->uniform_location("numLights");
+	Shader::set_int(num_lights_loc, static_cast<int>(state::lights.size()));
+
+	// Prepare each light
+	for (size_t i = 0; i < state::lights.size(); ++i) {
+		state::lights[i]->prepare(static_cast<int>(i), active_shader);
+	}
+
 	// Set texture-related uniforms
 	const int use_texture_loc =
 	    active_shader->uniform_location("useTexture");