From 11c5cdc7b08fe343ccbc9ffaf95d9f9c6d7d6016 Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Mon, 20 May 2019 19:05:58 +0000
Subject: [PATCH] Adjust GL3 ReadFrame() for GL ES 2.1 compatibility.

Currently on Win32 this errors out and renders a black rectangle.
---
 src/render/rendergl3.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/render/rendergl3.cpp b/src/render/rendergl3.cpp
index 167ce035..ce201aca 100644
--- a/src/render/rendergl3.cpp
+++ b/src/render/rendergl3.cpp
@@ -680,9 +680,10 @@ void OpenGl3Renderer::Clear() {
 
 std::shared_ptr<Pixmap> OpenGl3Renderer::ReadFrame() {
     std::shared_ptr<Pixmap> pixmap =
-        Pixmap::Create(Pixmap::Format::RGB, (size_t)camera.width, (size_t)camera.height);
+        Pixmap::Create(Pixmap::Format::RGBA, (size_t)camera.width, (size_t)camera.height);
     glReadPixels(0, 0, (int)camera.width, (int)camera.height,
-                 GL_RGB, GL_UNSIGNED_BYTE, &pixmap->data[0]);
+                 GL_RGBA, GL_UNSIGNED_BYTE, &pixmap->data[0]);
+    ssassert(glGetError() == GL_NO_ERROR, "Unexpected glReadPixels error");
     return pixmap;
 }