feat: assignment 3

src/material.cpp

@@ -0,0 +1,61 @@
+#include "material.h"
+
+#include "../lib/glm/glm.hpp"
+
+#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)
+{
+}
+
+const std::shared_ptr<Shader>& Material::shader() const
+{
+	return shader_ ? shader_ : state::default_shader;
+}
+
+std::shared_ptr<Shader>& Material::shader()
+{
+	return shader_ ? shader_ : state::default_shader;
+}
+
+void Material::set_shader(const std::shared_ptr<Shader>& shader)
+{
+	shader_ = shader;
+}
+
+void Material::prepare()
+{
+	// Activate shader
+	std::shared_ptr<Shader> active_shader = shader();
+	if (!active_shader)
+		return;
+
+	active_shader->use();
+
+	// Set uniform variables
+	const glm::mat4 mvp =
+	    state::projection_matrix * state::view_matrix * state::model_matrix;
+	const int mvp_loc = active_shader->uniform_location("mvp");
+	Shader::set_mat4(mvp_loc, mvp);
+
+	// Set texture-related uniforms
+	const int use_texture_loc =
+	    active_shader->uniform_location("useTexture");
+	if (texture_) {
+		Shader::set_int(use_texture_loc, 1);
+		const int sampler_loc =
+		    active_shader->uniform_location("texSampler");
+		Shader::set_int(sampler_loc, 0); // Texture unit 0
+	} else {
+		Shader::set_int(use_texture_loc, 0);
+	}
+
+	// Bind texture if available
+	if (texture_) {
+		texture_->bind();
+	}
+}