feat: assignment 3

src/texture.cpp

@@ -0,0 +1,83 @@
+#include "texture.h"
+
+#include <algorithm>
+
+#include "../lib/glew/GL/glew.h"
+#include "../lib/glfw/glfw3.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "../lib/stb/stb_image.h"
+
+#include "logger.h"
+
+Texture::Texture(uint32_t id, const glm::ivec2& size)
+    : id_(id), size_(size)
+{
+}
+
+Texture::~Texture()
+{
+	if (id_ != 0) {
+		glDeleteTextures(1, &id_);
+		Logger::info(sstr("Texture ", id_, " destroyed"));
+	}
+}
+
+std::shared_ptr<Texture> Texture::load(const char* filename)
+{
+	Logger::info(sstr("Loading texture: ", filename));
+
+	// Load image
+	int	 width, height, channels;
+	stbi_uc* pixels =
+	    stbi_load(filename, &width, &height, &channels, STBI_rgb_alpha);
+
+	if (!pixels) {
+		Logger::error(sstr("Failed to load texture: ", filename, " - ",
+				   stbi_failure_reason()));
+		return nullptr;
+	}
+
+	// Flip image vertically (OpenGL expects bottom row first)
+	const int row_size   = width * 4; // 4 channels (RGBA)
+	auto*	  row_buffer = new stbi_uc[row_size];
+	for (int y = 0; y < height / 2; ++y) {
+		stbi_uc* row1 = pixels + y * row_size;
+		stbi_uc* row2 = pixels + (height - 1 - y) * row_size;
+		std::copy(row1, row1 + row_size, row_buffer);
+		std::copy(row2, row2 + row_size, row1);
+		std::copy(row_buffer, row_buffer + row_size, row2);
+	}
+	delete[] row_buffer;
+
+	// Generate OpenGL texture
+	GLuint texture_id;
+	glGenTextures(1, &texture_id);
+	glBindTexture(GL_TEXTURE_2D, texture_id);
+
+	// Upload texture data
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
+		     GL_UNSIGNED_BYTE, pixels);
+
+	// Set trilinear filtering
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+			GL_LINEAR_MIPMAP_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+	// Generate mipmaps
+	glGenerateMipmap(GL_TEXTURE_2D);
+
+	// Free image data
+	stbi_image_free(pixels);
+
+	Logger::info(sstr("Texture loaded successfully: ", filename, " (",
+			  width, "x", height, ", ", channels, " channels)"));
+
+	return std::shared_ptr<Texture>(
+	    new Texture(texture_id, glm::ivec2(width, height)));
+}
+
+void Texture::bind() const
+{
+	glBindTexture(GL_TEXTURE_2D, id_);
+}