From 708566af7214e15bfbfce9515ffd3f063c6bea34 Mon Sep 17 00:00:00 2001
From: jnmartin84 <jnmartin84@gmail.com>
Date: Sat, 12 Jul 2025 12:07:04 -0400
Subject: [PATCH] initial support for GL_MIRRORED_REPEAT

---
 GL/private.h    |  4 +++-
 GL/state.c      |  2 +-
 GL/texture.c    | 12 ++++++++++++
 include/GL/gl.h |  1 +
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/GL/private.h b/GL/private.h
index b890b05..5ba1834 100644
--- a/GL/private.h
+++ b/GL/private.h
@@ -153,7 +153,9 @@ typedef struct {
     //50
     GLenum internalFormat;
     //54
-    GLubyte padding[10];  // Pad to 64-bytes
+    GLubyte uv_flip;
+    // 55
+    GLubyte padding[9];  // Pad to 64-bytes
 } __attribute__((aligned(32))) TextureObject;
 
 typedef struct {
diff --git a/GL/state.c b/GL/state.c
index 88aaad0..4d70b38 100644
--- a/GL/state.c
+++ b/GL/state.c
@@ -390,7 +390,7 @@ void _glUpdatePVRTextureContext(PolyContext *context, GLshort textureUnit) {
         }
 
         context->txr.env = tx1->env;
-        context->txr.uv_flip = GPU_UVFLIP_NONE;
+        context->txr.uv_flip = tx1->uv_flip;
         context->txr.uv_clamp = tx1->uv_clamp;
     }
 }
diff --git a/GL/texture.c b/GL/texture.c
index 2f34ab7..f6cbc35 100644
--- a/GL/texture.c
+++ b/GL/texture.c
@@ -17,6 +17,9 @@
 #define CLAMP_U (1<<1)
 #define CLAMP_V (1<<0)
 
+#define MIRROR_U (1<<1)
+#define MIRROR_V (1<<0)
+
 static TextureObject* TEXTURE_UNITS[MAX_GLDC_TEXTURE_UNITS] = {NULL, NULL};
 static NamedArray TEXTURE_OBJECTS;
 GLubyte ACTIVE_TEXTURE = 0;
@@ -505,6 +508,7 @@ static void _glInitializeTextureObject(TextureObject* txr, unsigned int id) {
     txr->width = txr->height = 0;
     txr->mipmap = 0;
     txr->uv_clamp = 0;
+    txr->uv_flip = 0;
     txr->env = GPU_TXRENV_MODULATEALPHA;
     txr->data = NULL;
     txr->mipmapCount = 0;
@@ -1899,6 +1903,10 @@ void APIENTRY glTexParameteri(GLenum target, GLenum pname, GLint param) {
                     case GL_REPEAT:
                         active->uv_clamp &= ~CLAMP_U;
                         break;
+
+                    case GL_MIRRORED_REPEAT:
+                        active->uv_flip |= MIRROR_U;
+                        break;
                 }
 
                 break;
@@ -1913,6 +1921,10 @@ void APIENTRY glTexParameteri(GLenum target, GLenum pname, GLint param) {
                     case GL_REPEAT:
                         active->uv_clamp &= ~CLAMP_V;
                         break;
+
+                    case GL_MIRRORED_REPEAT:
+                        active->uv_flip |= MIRROR_V;
+                        break;
                 }
 
                 break;
diff --git a/include/GL/gl.h b/include/GL/gl.h
index f6c7f4a..e67a88d 100644
--- a/include/GL/gl.h
+++ b/include/GL/gl.h
@@ -116,6 +116,7 @@ __BEGIN_DECLS
 #define GL_TEXTURE_WRAP_T       0x2803
 #define GL_TEXTURE_MAG_FILTER   0x2800
 #define GL_TEXTURE_MIN_FILTER   0x2801
+#define GL_MIRRORED_REPEAT      0x2902
 #define GL_REPEAT               0x2901
 #define GL_CLAMP                0x2900