Mercurial > ldforge2 / file diff

--- a/src/gl/partrenderer.cpp	Wed May 25 18:33:38 2022 +0300
+++ b/src/gl/partrenderer.cpp	Wed May 25 20:36:34 2022 +0300
@@ -352,15 +352,21 @@
 		viewportVector);
 }
 
-ldraw::id_t PartRenderer::pick(const QPoint& where)
+ldraw::id_t PartRenderer::pick(QPoint where)
 {
+	// y is flipped, take that into account
+	where.setY(this->height() - where.y());
+	// Since we are dealing with pixel data right from the framebuffer, its size
+	// will be affected by High DPI scaling. We need to take this into account
+	// and multiply the pixel positions by the screen pixel scaling factor.
+	where *= this->devicePixelRatioF();
 	const gl::RenderStyle oldRenderStyle = this->renderPreferences.style;
 	this->renderPreferences.style = gl::RenderStyle::PickScene;
 	this->makeCurrent();
 	this->renderScene();
 	std::array<GLubyte, 3> data;
 	this->checkForGLErrors();
-	glReadPixels(where.x(), this->height() - where.y(), 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &data[0]);
+	glfunc.glReadPixels(where.x(), where.y(), 1, 1, GL_RGB, GL_UNSIGNED_BYTE, &data[0]);
 	this->checkForGLErrors();
 	this->renderPreferences.style = oldRenderStyle;
 	this->update();