memory refactor Texture and ImageData

src/graphics/core/GLTexture.cpp

@@ -0,0 +1,75 @@
+#include "GLTexture.hpp"
+#include "gl_util.hpp"
+
+#include <GL/glew.h>
+#include <stdexcept>
+#include <memory>
+
+uint Texture::MAX_RESOLUTION = 1024; // Window.initialize overrides it
+
+GLTexture::GLTexture(uint id, uint width, uint height) 
+    : Texture(width, height), id(id) {
+}
+
+GLTexture::GLTexture(const ubyte* data, uint width, uint height, ImageFormat imageFormat) 
+    : Texture(width, height) {
+    glGenTextures(1, &id);
+    glBindTexture(GL_TEXTURE_2D, id);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+    GLenum format = gl::to_glenum(imageFormat);
+    glTexImage2D(
+        GL_TEXTURE_2D, 0, format, width, height, 0,
+        format, GL_UNSIGNED_BYTE, static_cast<const GLvoid*>(data)
+    );
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+GLTexture::~GLTexture() {
+    glDeleteTextures(1, &id);
+}
+
+void GLTexture::bind(){
+    glBindTexture(GL_TEXTURE_2D, id);
+}
+
+void GLTexture::unbind() {
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void GLTexture::reload(const ubyte* data){
+    glBindTexture(GL_TEXTURE_2D, id);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+        GL_RGBA, GL_UNSIGNED_BYTE, static_cast<const GLvoid*>(data));
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+std::unique_ptr<ImageData> GLTexture::readData() {
+    auto data = std::make_unique<ubyte[]>(width * height * 4);
+    glBindTexture(GL_TEXTURE_2D, id);
+    glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, data.get());
+    glBindTexture(GL_TEXTURE_2D, 0);
+    return std::make_unique<ImageData>(ImageFormat::rgba8888, width, height, data.release());
+}
+
+void GLTexture::setNearestFilter() {
+    bind();
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+std::unique_ptr<GLTexture> GLTexture::from(const ImageData* image) {
+    uint width = image->getWidth();
+    uint height = image->getHeight();
+    void* data = image->getData();
+    return std::make_unique<GLTexture>(static_cast<ubyte*>(data), width, height, image->getFormat());
+}
+
+uint GLTexture::getId() const {
+    return id;
+}