From 221a7d0618b4f8b6af19b089f49818806fe1e1b3 Mon Sep 17 00:00:00 2001
From: kdx <kikoodx@paranoici.org>
Date: Sat, 16 Dec 2023 03:23:01 +0100
Subject: resizable viewport

---
 headers/TZR.h                 |  3 +++
 main.c                        |  2 ++
 sources/TZR_Init.c            | 24 +++---------------------
 sources/TZR_SetViewportSize.c | 40 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 48 insertions(+), 21 deletions(-)
 create mode 100644 sources/TZR_SetViewportSize.c

diff --git a/headers/TZR.h b/headers/TZR.h
index fab1c55..2d9e7d4 100644
--- a/headers/TZR.h
+++ b/headers/TZR.h
@@ -50,3 +50,6 @@ int TZR_MainLoop(int (*main_loop)(void *udata), void *udata);
 unsigned long TZR_GetTick(void);
 
 void TZR_ToggleFullscreen(void);
+
+/* NEVER call this during draw */
+int TZR_SetViewportSize(int width, int height);
diff --git a/main.c b/main.c
index 9bd302b..8d06221 100644
--- a/main.c
+++ b/main.c
@@ -60,6 +60,8 @@ main_loop(void *udata)
 	if (TZR_IsKeyPressed(SDL_SCANCODE_SPACE))
 		TZR_PlaySound(id2);
 
+	TZR_SetViewportSize(256 + x, 256 + y);
+
 	if (TZR_DrawBegin()
 	 || TZR_DrawSetColor(0.0f, 0.0f, 0.0f)
 	 || TZR_DrawClear()
diff --git a/sources/TZR_Init.c b/sources/TZR_Init.c
index 5c9241b..ea0eaba 100644
--- a/sources/TZR_Init.c
+++ b/sources/TZR_Init.c
@@ -63,27 +63,9 @@ _TZR_Init(const TZR_Config *config)
 	if (___tzr_renderer == NULL)
 		return _sdl_error();
 
-	if (___tzr_config.hd_render) {
-		if (SDL_RenderSetLogicalSize(___tzr_renderer,
-		                             ___tzr_config.width,
-		                             ___tzr_config.height) < 0)
-			return _sdl_error();
-	} else {
-		___tzr_target = SDL_CreateTexture(___tzr_renderer,
-		                                  SDL_PIXELFORMAT_RGB888,
-		                                  SDL_TEXTUREACCESS_TARGET,
-		                                  ___tzr_config.width,
-		                                  ___tzr_config.height);
-		if (___tzr_target == NULL)
-			return _sdl_error();
-		if (___tzr_config.interlace) {
-			___tzr_target_pre = SDL_CreateTexture(
-			    ___tzr_renderer,
-			    SDL_PIXELFORMAT_RGB888,
-			    SDL_TEXTUREACCESS_TARGET,
-			    ___tzr_config.width,
-			    ___tzr_config.height);
-		}
+	if (TZR_SetViewportSize(___tzr_config.width, ___tzr_config.height)) {
+		TZR_Quit();
+		return -1;
 	}
 
 	SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY,
diff --git a/sources/TZR_SetViewportSize.c b/sources/TZR_SetViewportSize.c
new file mode 100644
index 0000000..fee70db
--- /dev/null
+++ b/sources/TZR_SetViewportSize.c
@@ -0,0 +1,40 @@
+#include "TZR.h"
+#include "TZR_globals.h"
+#include "sdl_error.h"
+
+int
+TZR_SetViewportSize(int width, int height)
+{
+	const int pw = ___tzr_config.width;
+	const int ph = ___tzr_config.height;
+	___tzr_config.width = width;
+	___tzr_config.height = height;
+	if (___tzr_config.hd_render) {
+		if (SDL_RenderSetLogicalSize(___tzr_renderer,
+		                             ___tzr_config.width,
+		                             ___tzr_config.height) < 0)
+			return sdl_error(-1);
+	} else {
+		if (___tzr_target != NULL && pw == width && ph == height)
+			return 0;
+		if (___tzr_target != NULL)
+			SDL_DestroyTexture(___tzr_target);
+		___tzr_target = SDL_CreateTexture(___tzr_renderer,
+		                                  SDL_PIXELFORMAT_RGB888,
+		                                  SDL_TEXTUREACCESS_TARGET,
+		                                  ___tzr_config.width,
+		                                  ___tzr_config.height);
+		if (___tzr_target == NULL)
+			return sdl_error(-1);
+		if (___tzr_config.interlace) {
+			___tzr_target_pre = SDL_CreateTexture(
+			    ___tzr_renderer,
+			    SDL_PIXELFORMAT_RGB888,
+			    SDL_TEXTUREACCESS_TARGET,
+			    ___tzr_config.width,
+			    ___tzr_config.height);
+		}
+	}
+	return 0;
+}
+
-- 
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