From 36084ea18b3a5097eb2b04941eefc026b3794d8f Mon Sep 17 00:00:00 2001
From: Nigel Stewart <nigels@nigels.com>
Date: Thu, 19 Jun 2025 21:42:17 +1000
Subject: [PATCH] osmesa: Resolve compilation warnings

---
 auto/src/glewinfo_head.c     | 5 +++++
 auto/src/glewinfo_tail.c     | 4 +++-
 config/Makefile.linux-osmesa | 2 +-
 src/visualinfo.c             | 5 ++++-
 4 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/auto/src/glewinfo_head.c b/auto/src/glewinfo_head.c
index 79ed785..cfd79da 100644
--- a/auto/src/glewinfo_head.c
+++ b/auto/src/glewinfo_head.c
@@ -5,7 +5,12 @@
 #if defined(GLEW_EGL)
 #include <GL/eglew.h>
 #elif defined(GLEW_OSMESA)
+#ifndef GLAPI
 #define GLAPI extern
+#endif
+#ifndef APIENTRY
+#define APIENTRY
+#endif
 #include <GL/osmesa.h>
 #elif defined(_WIN32)
 #include <GL/wglew.h>
diff --git a/auto/src/glewinfo_tail.c b/auto/src/glewinfo_tail.c
index fe51168..f48dd0b 100644
--- a/auto/src/glewinfo_tail.c
+++ b/auto/src/glewinfo_tail.c
@@ -314,13 +314,15 @@ static GLubyte *osmPixels = NULL;
 
 GLboolean glewCreateContext (struct createParams *params)
 {
+  (void) params; /* not used */
+
   ctx = OSMesaCreateContext(OSMESA_RGBA, NULL);
   if (NULL == ctx) return GL_TRUE;
   if (NULL == osmPixels)
   {
     osmPixels = (GLubyte *) calloc(osmWidth*osmHeight*4, 1);
   }
-  if (!OSMesaMakeCurrent(ctx, osmPixels, GL_UNSIGNED_BYTE, osmWidth, osmHeight))
+  if (!OSMesaMakeCurrent(ctx, osmPixels, osmFormat, osmWidth, osmHeight))
   {
       return GL_TRUE;
   }
diff --git a/config/Makefile.linux-osmesa b/config/Makefile.linux-osmesa
index c957872..98e51b2 100644
--- a/config/Makefile.linux-osmesa
+++ b/config/Makefile.linux-osmesa
@@ -1,4 +1,4 @@
 include config/Makefile.linux
 
 LDFLAGS.GL = -lOSMesa
-CFLAGS.EXTRA += -DGLEW_OSMESA
+CFLAGS.EXTRA += -DGLEW_OSMESA -Wno-cast-function-type
diff --git a/src/visualinfo.c b/src/visualinfo.c
index 1de1fa7..4fc106b 100644
--- a/src/visualinfo.c
+++ b/src/visualinfo.c
@@ -36,6 +36,9 @@
 #include <GL/glew.h>
 #if defined(GLEW_OSMESA)
 #define GLAPI extern
+#ifndef APIENTRY
+#define APIENTRY
+#endif
 #include <GL/osmesa.h>
 #elif defined(GLEW_EGL)
 #include <GL/eglew.h>
@@ -1027,7 +1030,7 @@ GLboolean CreateContext (GLContext* ctx)
   {
     osmPixels = (GLubyte *) calloc(osmWidth*osmHeight*4, 1);
   }
-  if (!OSMesaMakeCurrent(ctx->ctx, osmPixels, GL_UNSIGNED_BYTE, osmWidth, osmHeight))
+  if (!OSMesaMakeCurrent(ctx->ctx, osmPixels, osmFormat, osmWidth, osmHeight))
   {
       return GL_TRUE;
   }