From 7d147032543f51c93123c484d0c2b2c7e191df26 Mon Sep 17 00:00:00 2001
From: don bright <hugh.m.bright@gmail.com>
Date: Sat, 26 Jan 2013 07:10:36 +0100
Subject: [PATCH] commit files created during refactor

---
 src/CsgInfo.h               | 42 ++++++++++++++++++++++
 src/OffscreenContextAll.hpp | 70 +++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 src/CsgInfo.h
 create mode 100644 src/OffscreenContextAll.hpp

diff --git a/src/CsgInfo.h b/src/CsgInfo.h
new file mode 100644
index 00000000..fa3e100d
--- /dev/null
+++ b/src/CsgInfo.h
@@ -0,0 +1,42 @@
+#ifndef __CSGINFO_H__
+#define __CSGINFO_H__
+
+#include "OffscreenView.h"
+
+class CsgInfo
+{
+public:
+	CsgInfo() { glview = NULL; }
+  OffscreenView *glview;
+};
+
+
+#ifdef ENABLE_OPENCSG
+
+#include <opencsg.h>
+#include "OpenCSGRenderer.h"
+#include "csgterm.h"
+#include "csgtermnormalizer.h"
+
+class CsgInfo_OpenCSG : public CsgInfo
+{
+public:
+  CsgInfo_OpenCSG()
+  {
+    root_chain = NULL;
+    highlights_chain = NULL;
+    background_chain = NULL;
+    glview = NULL;
+  }
+	shared_ptr<CSGTerm> root_norm_term;    // Normalized CSG products
+  class CSGChain *root_chain;
+  std::vector<shared_ptr<CSGTerm> > highlight_terms;
+  CSGChain *highlights_chain;
+  std::vector<shared_ptr<CSGTerm> > background_terms;
+  CSGChain *background_chain;
+};
+
+#endif // ENABLE_OPENCSG
+
+#endif
+
diff --git a/src/OffscreenContextAll.hpp b/src/OffscreenContextAll.hpp
new file mode 100644
index 00000000..8ee7ebec
--- /dev/null
+++ b/src/OffscreenContextAll.hpp
@@ -0,0 +1,70 @@
+// Functions shared by OffscreenContext[platform].cc
+
+void bind_offscreen_context(OffscreenContext *ctx)
+{
+  if (ctx) fbo_bind(ctx->fbo);
+}
+
+/*
+  Capture framebuffer from OpenGL and write it to the given filename as PNG.
+*/
+bool save_framebuffer(OffscreenContext *ctx, const char *filename)
+{
+  std::ofstream fstream(filename);
+  if (!fstream.is_open()) {
+    std::cerr << "Can't open file " << filename << " for writing";
+    return false;
+  } else {
+    save_framebuffer(ctx, fstream);
+    fstream.close();
+  }
+  return true;
+}
+
+/*!
+  Capture framebuffer from OpenGL and write it to the given ostream.
+	Called by save_framebuffer() from platform-specific code.
+*/
+bool save_framebuffer_common(OffscreenContext *ctx, std::ostream &output)
+{
+  if (!ctx) return false;
+  int samplesPerPixel = 4; // R, G, B and A
+  vector<GLubyte> pixels(ctx->width * ctx->height * samplesPerPixel);
+  glReadPixels(0, 0, ctx->width, ctx->height, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]);
+
+  // Flip it vertically - images read from OpenGL buffers are upside-down
+  int rowBytes = samplesPerPixel * ctx->width;
+
+  unsigned char *flippedBuffer = (unsigned char *)malloc(rowBytes * ctx->height);
+  if (!flippedBuffer) {
+    std::cerr << "Unable to allocate flipped buffer for corrected image.";
+    return 1;
+  }
+  flip_image(&pixels[0], flippedBuffer, samplesPerPixel, ctx->width, ctx->height);
+
+  bool writeok = write_png(output, flippedBuffer, ctx->width, ctx->height);
+
+  free(flippedBuffer);
+
+	return writeok;
+}
+
+//	Called by create_offscreen_context() from platform-specific code.
+OffscreenContext *create_offscreen_context_common(OffscreenContext *ctx)
+{
+	if (!ctx) return NULL;
+	GLenum err = glewInit(); // must come after Context creation and before FBO c$
+  if (GLEW_OK != err) {
+    cerr << "Unable to init GLEW: " << glewGetErrorString(err) << "\n";
+    return NULL;
+  }
+  //cerr << glew_dump(0);
+
+  ctx->fbo = fbo_new();
+  if (!fbo_init(ctx->fbo, ctx->width, ctx->height)) {
+    return NULL;
+  }
+
+  return ctx;
+}
+