1 files changed, 65 insertions, 0 deletions
diff --git a/src/vertex-clipping.h b/src/vertex-clipping.h
new file mode 100644
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+++ b/src/vertex-clipping.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifndef _WESTON_VERTEX_CLIPPING_H
+#define _WESTON_VERTEX_CLIPPING_H
+
+#include <GLES2/gl2.h>
+
+struct polygon8 {
+	GLfloat x[8];
+	GLfloat y[8];
+	int n;
+};
+
+struct clip_context {
+	struct {
+		GLfloat x;
+		GLfloat y;
+	} prev;
+
+	struct {
+		GLfloat x1, y1;
+		GLfloat x2, y2;
+	} clip;
+
+	struct {
+		GLfloat *x;
+		GLfloat *y;
+	} vertices;
+};
+
+GLfloat
+float_difference(GLfloat a, GLfloat b);
+
+int
+clip_simple(struct clip_context *ctx,
+	    struct polygon8 *surf,
+	    GLfloat *ex,
+	    GLfloat *ey);
+
+int
+clip_transformed(struct clip_context *ctx,
+		 struct polygon8 *surf,
+		 GLfloat *ex,
+		 GLfloat *ey);\
+
+#endif