From 90a2b0d61eac5fdf7d8c201793b5be1826512598 Mon Sep 17 00:00:00 2001
From: Alberto Mardegan <mardy@users.sourceforge.net>
Date: Thu, 9 Apr 2026 21:50:24 +0300
Subject: [PATCH] opengl: set viewport size to window size

The OpenGL specification says that the initial values for the OpenGL
viewport should match the window size.
---
 src/video/ogc/SDL_ogcgl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/video/ogc/SDL_ogcgl.c b/src/video/ogc/SDL_ogcgl.c
index fd26d690e9acd..6299b5bd48ea4 100644
--- a/src/video/ogc/SDL_ogcgl.c
+++ b/src/video/ogc/SDL_ogcgl.c
@@ -84,6 +84,7 @@ SDL_GLContext SDL_OGC_GL_CreateContext(_THIS, SDL_Window * window)
     context->window = window;
     context->swap_interval = 1;
     ogx_initialize();
+    glViewport(0, 0, window->w, window->h);
     if (_this->gl_config.stencil_size > 0) {
         OgxStencilFlags flags = 0; /* Don't care if Z gets dirty on discarded fragments */
         if (_this->gl_config.stencil_size > 4) flags |= OGX_STENCIL_8BIT;