From 4b2e3e67266ae4ed153ccbf98b2e5b94de85353b Mon Sep 17 00:00:00 2001
From: Cameron Cawley <ccawley2011@gmail.com>
Date: Fri, 3 Feb 2023 18:49:13 +0000
Subject: [PATCH] TINYGL: Use realloc to increase the size of the vertex array

---
 graphics/tinygl/memory.cpp | 4 ++++
 graphics/tinygl/vertex.cpp | 4 +---
 graphics/tinygl/zbuffer.h  | 1 +
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/graphics/tinygl/memory.cpp b/graphics/tinygl/memory.cpp
index d756e39103c..280d90070da 100644
--- a/graphics/tinygl/memory.cpp
+++ b/graphics/tinygl/memory.cpp
@@ -45,4 +45,8 @@ void *gl_zalloc(int size) {
 	return calloc(1, size);
 }
 
+void *gl_realloc(void *p, int size) {
+	return realloc(p, size);
+}
+
 } // end of namespace TinyGL
diff --git a/graphics/tinygl/vertex.cpp b/graphics/tinygl/vertex.cpp
index db70b1bbd85..fa99885e6ea 100644
--- a/graphics/tinygl/vertex.cpp
+++ b/graphics/tinygl/vertex.cpp
@@ -209,12 +209,10 @@ void GLContext::glopVertex(GLParam *p) {
 	if (n >= vertex_max) {
 		GLVertex *newarray;
 		vertex_max <<= 1;    // just double size
-		newarray = (GLVertex *)gl_malloc(sizeof(GLVertex) * vertex_max);
+		newarray = (GLVertex *)gl_realloc(vertex, sizeof(GLVertex) * vertex_max);
 		if (!newarray) {
 			error("unable to allocate GLVertex array.");
 		}
-		memcpy(newarray, vertex, n * sizeof(GLVertex));
-		gl_free(vertex);
 		vertex = newarray;
 	}
 	// new vertex entry
diff --git a/graphics/tinygl/zbuffer.h b/graphics/tinygl/zbuffer.h
index ea325b9a803..797062d24b0 100644
--- a/graphics/tinygl/zbuffer.h
+++ b/graphics/tinygl/zbuffer.h
@@ -742,6 +742,7 @@ private:
 void gl_free(void *p);
 void *gl_malloc(int size);
 void *gl_zalloc(int size);
+void *gl_realloc(void *p, int size);
 
 } // end of namespace TinyGL