1 files changed, 81 insertions, 0 deletions
diff --git a/source/blender/gpu/opengl/gl_texture.hh b/source/blender/gpu/opengl/gl_texture.hh
new file mode 100644
index 00000000000..c1194941038
--- /dev/null
+++ b/source/blender/gpu/opengl/gl_texture.hh
@@ -0,0 +1,81 @@
+
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup gpu
+ *
+ * GPU Framebuffer
+ * - this is a wrapper for an OpenGL framebuffer object (FBO). in practice
+ *   multiple FBO's may be created.
+ * - actual FBO creation & config is deferred until GPU_framebuffer_bind or
+ *   GPU_framebuffer_check_valid to allow creation & config while another
+ *   opengl context is bound (since FBOs are not shared between ogl contexts).
+ */
+
+#pragma once
+
+#include "BLI_assert.h"
+
+#include "glew-mx.h"
+
+namespace blender {
+namespace gpu {
+
+static GLenum to_gl(eGPUDataFormat format)
+{
+  switch (format) {
+    case GPU_DATA_FLOAT:
+      return GL_FLOAT;
+    case GPU_DATA_INT:
+      return GL_INT;
+    case GPU_DATA_UNSIGNED_INT:
+      return GL_UNSIGNED_INT;
+    case GPU_DATA_UNSIGNED_BYTE:
+      return GL_UNSIGNED_BYTE;
+    case GPU_DATA_UNSIGNED_INT_24_8:
+      return GL_UNSIGNED_INT_24_8;
+    case GPU_DATA_10_11_11_REV:
+      return GL_UNSIGNED_INT_10F_11F_11F_REV;
+    default:
+      BLI_assert(!"Unhandled data format");
+      return GL_FLOAT;
+  }
+}
+
+/* Assume Unorm / Float target. Used with glReadPixels. */
+static GLenum channel_len_to_gl(int channel_len)
+{
+  switch (channel_len) {
+    case 1:
+      return GL_RED;
+    case 2:
+      return GL_RG;
+    case 3:
+      return GL_RGB;
+    case 4:
+      return GL_RGBA;
+    default:
+      BLI_assert(!"Wrong number of texture channels");
+      return GL_RED;
+  }
+}
+
+}  // namespace gpu
+}  // namespace blender