1 files changed, 150 insertions, 0 deletions
diff --git a/source/blender/gpu/intern/gpu_clipping.c b/source/blender/gpu/intern/gpu_clipping.c
new file mode 100644
index 00000000000..395e661edf8
--- /dev/null
+++ b/source/blender/gpu/intern/gpu_clipping.c
@@ -0,0 +1,150 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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) 2013 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Jason Wilkins
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file source/blender/gpu/intern/gpu_clipping.c
+ *  \ingroup gpu
+ */
+
+#if WITH_GL_PROFILE_COMPAT
+#define GPU_MANGLE_DEPRECATED 0 /* Allow use of deprecated OpenGL functions in this file */
+#endif
+
+/* my interface */
+#include "intern/gpu_clipping_intern.h"
+
+/* my library */
+//#include "GPU_extensions.h"
+#include "GPU_matrix.h"
+#include "GPU_safety.h"
+#include "GPU_common.h"
+
+/* internal */
+#include "intern/gpu_common_intern.h"
+
+/* external */
+#include "BLI_math_vector.h"
+
+
+
+static struct CLIPPING {
+	double   clip_plane[GPU_MAX_COMMON_CLIP_PLANES][4];
+	uint32_t clip_plane_count;
+} CLIPPING;
+
+
+
+void gpu_clipping_init(void)
+{
+	memset(&CLIPPING, 0, sizeof(CLIPPING));
+}
+
+
+
+void gpu_clipping_exit(void)
+{
+}
+
+
+
+void gpu_commit_clipping(void)
+{
+	const struct GPUcommon* common = gpu_get_common();
+
+	int i;
+
+	for (i = 0; i < CLIPPING.clip_plane_count; i++) {
+		if (common) {
+			glUniform4dv(common->clip_plane[i], 1, CLIPPING.clip_plane[i]);
+		}
+
+#if defined(WITH_GL_PROFILE_COMPAT)
+		if (i < 6) {
+			glClipPlane(GL_CLIP_PLANE0+i, CLIPPING.clip_plane[i]); // deprecated
+		}
+#endif
+	}
+
+	if (common)
+		glUniform1i(common->clip_plane_count, CLIPPING.clip_plane_count);
+}
+
+
+
+void GPU_restore_clip_planes(int clip_plane_count, const GPUplane clip_planes[])
+{
+	GPU_ASSERT(clip_plane_count >= 0);
+	GPU_ASSERT(clip_plane_count < GPU_MAX_COMMON_CLIP_PLANES);
+
+	memcpy(CLIPPING.clip_plane, clip_planes, clip_plane_count*sizeof(GPUplane));
+
+	CLIPPING.clip_plane_count = clip_plane_count;
+}
+
+
+
+static void feedback_clip_plane_position(double position[4] /* in-out */)
+{
+	GPU_feedback_vertex_4dv(GL_MODELVIEW_MATRIX,  position[0], position[1], position[2], position[3], position);
+}
+
+
+
+void GPU_set_clip_planes(int clip_plane_count, const GPUplane clip_planes[])
+{
+	int i;
+
+	GPU_restore_clip_planes(clip_plane_count, clip_planes);
+
+	for (i = 0; i < clip_plane_count; i++) {
+		feedback_clip_plane_position(CLIPPING.clip_plane[i]);
+	}
+}
+
+
+
+int GPU_get_clip_planes(GPUplane clip_planes_out[])
+{
+	memcpy(clip_planes_out, CLIPPING.clip_plane, CLIPPING.clip_plane_count*sizeof(GPUplane));
+
+	return CLIPPING.clip_plane_count;
+}
+
+
+
+#if defined(WITH_GL_PROFILE_COMPAT)
+void gpu_toggle_clipping(bool enable)
+{
+	unsigned int i;
+
+	for (i = 0; i < CLIPPING.clip_plane_count; i++) {
+		if (enable)
+			glEnable (GL_CLIP_PLANE0 + i); // deprecated
+		else
+			glDisable(GL_CLIP_PLANE0 + i); // deprecated
+	}
+}
+#endif