From 5faea84c631e39fbd9b2743bedb2545d882baed9 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Sat, 18 Sep 2021 11:54:25 -0400
Subject: [PATCH] render: Mark viewport/cliprect dirty when window is resized.

Fixes #4751.
---
 src/render/opengl/SDL_render_gl.c        |  9 ++++++++-
 src/render/opengles/SDL_render_gles.c    | 10 +++++++++-
 src/render/opengles2/SDL_render_gles2.c  |  9 ++++++++-
 src/render/vitagxm/SDL_render_vita_gxm.c | 10 +++++++++-
 4 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/src/render/opengl/SDL_render_gl.c b/src/render/opengl/SDL_render_gl.c
index d7f7a4406..758166a98 100644
--- a/src/render/opengl/SDL_render_gl.c
+++ b/src/render/opengl/SDL_render_gl.c
@@ -1279,7 +1279,14 @@ GL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
 
     data->drawstate.target = renderer->target;
     if (!data->drawstate.target) {
-        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
+        int w, h;
+        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
+        if ((w != data->drawstate.drawablew) || (h != data->drawstate.drawableh)) {
+            data->drawstate.viewport_dirty = SDL_TRUE;  // if the window dimensions changed, invalidate the current viewport, etc.
+            data->drawstate.cliprect_dirty = SDL_TRUE;
+            data->drawstate.drawablew = w;
+            data->drawstate.drawableh = h;
+        }
     }
 
 
diff --git a/src/render/opengles/SDL_render_gles.c b/src/render/opengles/SDL_render_gles.c
index 017229e9c..c0a2ce9dc 100644
--- a/src/render/opengles/SDL_render_gles.c
+++ b/src/render/opengles/SDL_render_gles.c
@@ -934,7 +934,15 @@ GLES_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vert
     data->drawstate.target = renderer->target;
 
     if (!renderer->target) {
-        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
+        int w, h;
+        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
+        if ((w != data->drawstate.drawablew) || (h != data->drawstate.drawableh)) {
+            data->drawstate.viewport_dirty = SDL_TRUE;  // if the window dimensions changed, invalidate the current viewport, etc.
+            data->drawstate.cliprect_dirty = SDL_TRUE;
+            data->drawstate.drawablew = w;
+            data->drawstate.drawableh = h;
+        }
+
     }
 
     while (cmd) {
diff --git a/src/render/opengles2/SDL_render_gles2.c b/src/render/opengles2/SDL_render_gles2.c
index 73cca1bcb..7ea703d8f 100644
--- a/src/render/opengles2/SDL_render_gles2.c
+++ b/src/render/opengles2/SDL_render_gles2.c
@@ -1270,7 +1270,14 @@ GLES2_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
 
     data->drawstate.target = renderer->target;
     if (!data->drawstate.target) {
-        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
+        int w, h;
+        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
+        if ((w != data->drawstate.drawablew) || (h != data->drawstate.drawableh)) {
+            data->drawstate.viewport_dirty = SDL_TRUE;  // if the window dimensions changed, invalidate the current viewport, etc.
+            data->drawstate.cliprect_dirty = SDL_TRUE;
+            data->drawstate.drawablew = w;
+            data->drawstate.drawableh = h;
+        }
     }
 
     /* upload the new VBO data for this set of commands. */
diff --git a/src/render/vitagxm/SDL_render_vita_gxm.c b/src/render/vitagxm/SDL_render_vita_gxm.c
index 67a834ba0..bd9230f9e 100644
--- a/src/render/vitagxm/SDL_render_vita_gxm.c
+++ b/src/render/vitagxm/SDL_render_vita_gxm.c
@@ -987,7 +987,15 @@ VITA_GXM_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *
 
     data->drawstate.target = renderer->target;
     if (!data->drawstate.target) {
-        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
+        int w, h;
+        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
+        if ((w != data->drawstate.drawablew) || (h != data->drawstate.drawableh)) {
+            data->drawstate.viewport_dirty = SDL_TRUE;  // if the window dimensions changed, invalidate the current viewport, etc.
+            data->drawstate.cliprect_dirty = SDL_TRUE;
+            data->drawstate.drawablew = w;
+            data->drawstate.drawableh = h;
+        }
+
     }
 
     while (cmd) {