commit files created during refactor

1 files changed, 70 insertions, 0 deletions

diff --git a/src/OffscreenContextAll.hpp b/src/OffscreenContextAll.hpp
new file mode 100644
index 0000000..8ee7ebe
--- /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;
+}
+