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