From 714a49685f5d24b782708470dfb6a10103134d7b Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Sun, 21 Jan 2024 22:29:14 +0300
Subject: [PATCH] Texture.readData

---
 src/graphics/Texture.cpp | 69 +++++++++++++++++++++++-----------------
 src/graphics/Texture.h   |  2 ++
 2 files changed, 41 insertions(+), 30 deletions(-)

diff --git a/src/graphics/Texture.cpp b/src/graphics/Texture.cpp
index 0d5ae803..5531be1e 100644
--- a/src/graphics/Texture.cpp
+++ b/src/graphics/Texture.cpp
@@ -1,52 +1,61 @@
 #include "Texture.h"
 #include <GL/glew.h>
 #include <stdexcept>
+#include <memory>
 
 #include "ImageData.h"
 
 Texture::Texture(uint id, int width, int height) 
-	: id(id), width(width), height(height) {
+    : id(id), width(width), height(height) {
 }
 
 Texture::Texture(ubyte* data, int width, int height, uint format) 
-	: width(width), height(height) {
-	glGenTextures(1, &id);
-	glBindTexture(GL_TEXTURE_2D, id);
-	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-	glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0,
-		format, GL_UNSIGNED_BYTE, (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, 2);
-	glBindTexture(GL_TEXTURE_2D, 0);
+    : width(width), height(height) {
+    glGenTextures(1, &id);
+    glBindTexture(GL_TEXTURE_2D, id);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0,
+        format, GL_UNSIGNED_BYTE, (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, 2);
+    glBindTexture(GL_TEXTURE_2D, 0);
 }
 
 Texture::~Texture() {
-	glDeleteTextures(1, &id);
+    glDeleteTextures(1, &id);
 }
 
 void Texture::bind(){
-	glBindTexture(GL_TEXTURE_2D, id);
+    glBindTexture(GL_TEXTURE_2D, id);
 }
 
 void Texture::reload(ubyte* data){
-	glBindTexture(GL_TEXTURE_2D, id);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
-		GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *) data);
-	glBindTexture(GL_TEXTURE_2D, 0);
+    glBindTexture(GL_TEXTURE_2D, id);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+        GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *) data);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+ImageData* Texture::readData() {
+    std::unique_ptr<ubyte[]> data (new 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 new ImageData(ImageFormat::rgba8888, width, height, data.release());
 }
 
 Texture* Texture::from(const ImageData* image) {
-	uint width = image->getWidth();
-	uint height = image->getHeight();
-	uint format;
-	const void* data = image->getData();
-	switch (image->getFormat())	{
-		case ImageFormat::rgb888: format = GL_RGB; break;
-		case ImageFormat::rgba8888: format = GL_RGBA; break;
-		default:
-			throw std::runtime_error("unsupported image data format");
-	}
-	return new Texture((ubyte*)data, width, height, format);
-}
\ No newline at end of file
+    uint width = image->getWidth();
+    uint height = image->getHeight();
+    uint format;
+    const void* data = image->getData();
+    switch (image->getFormat())	{
+        case ImageFormat::rgb888: format = GL_RGB; break;
+        case ImageFormat::rgba8888: format = GL_RGBA; break;
+        default:
+            throw std::runtime_error("unsupported image data format");
+    }
+    return new Texture((ubyte*)data, width, height, format);
+}
diff --git a/src/graphics/Texture.h b/src/graphics/Texture.h
index 4e85cb86..595ba411 100644
--- a/src/graphics/Texture.h
+++ b/src/graphics/Texture.h
@@ -18,6 +18,8 @@ public:
 	void bind();
 	void reload(ubyte* data);
 
+    ImageData* readData();
+
 	static Texture* from(const ImageData* image);
 };