From 06891ebb351142829f30470a056cfe07ad8cfe63 Mon Sep 17 00:00:00 2001
From: Nigel Stewart <nigels@users.sourceforge.net>
Date: Mon, 12 Oct 2015 20:17:34 +1000
Subject: [PATCH] OSMesaMakeCurrent for glewCreateContext in GLEW_OSMESA mode.

---
 auto/src/glewinfo_tail.c | 13 +++++++++++++
 src/visualinfo.c         | 13 +++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/auto/src/glewinfo_tail.c b/auto/src/glewinfo_tail.c
index 1774de7..1999b06 100644
--- a/auto/src/glewinfo_tail.c
+++ b/auto/src/glewinfo_tail.c
@@ -159,10 +159,23 @@ GLboolean glewParseArgs (int argc, char** argv, struct createParams *params)
 #if defined(GLEW_OSMESA)
 OSMesaContext ctx;
 
+static const GLint osmFormat = GL_UNSIGNED_BYTE;
+static const GLint osmWidth = 640;
+static const GLint osmHeight = 480;
+static GLubyte *osmPixels = NULL;
+
 GLboolean glewCreateContext (struct createParams *params)
 {
   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))
+  {
+      return GL_TRUE;
+  }
   return GL_FALSE;
 }
 
diff --git a/src/visualinfo.c b/src/visualinfo.c
index 2cd000a..c24bbaf 100644
--- a/src/visualinfo.c
+++ b/src/visualinfo.c
@@ -1022,11 +1022,24 @@ void InitContext (GLContext* ctx)
   ctx->ctx = NULL;
 }
 
+static const GLint osmFormat = GL_UNSIGNED_BYTE;
+static const GLint osmWidth = 640;
+static const GLint osmHeight = 480;
+static GLubyte *osmPixels = NULL;
+
 GLboolean CreateContext (GLContext* ctx)
 {
   if (NULL == ctx) return GL_TRUE;
   ctx->ctx = OSMesaCreateContext(OSMESA_RGBA, NULL);
   if (NULL == ctx->ctx) return GL_TRUE;
+  if (NULL == osmPixels)
+  {
+    osmPixels = (GLubyte *) calloc(osmWidth*osmHeight*4, 1);
+  }
+  if (!OSMesaMakeCurrent(ctx->ctx, osmPixels, GL_UNSIGNED_BYTE, osmWidth, osmHeight))
+  {
+      return GL_TRUE;
+  }
   return GL_FALSE;
 }