From 544dd4b11f7be76bb00fe29a60eaf2772dcc69ca Mon Sep 17 00:00:00 2001
From: Zack Rusin <zackr@vmware.com>
Date: Fri, 1 May 2009 12:41:38 -0400
Subject: OpenVG 1.0 State Tracker

Import of the OpenVG 1.0 state tracker for Gallium.
---
 progs/openvg/trivial/star-oddeven.c | 102 ++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 progs/openvg/trivial/star-oddeven.c

(limited to 'progs/openvg/trivial/star-oddeven.c')

diff --git a/progs/openvg/trivial/star-oddeven.c b/progs/openvg/trivial/star-oddeven.c
new file mode 100644
index 0000000000..17311cf720
--- /dev/null
+++ b/progs/openvg/trivial/star-oddeven.c
@@ -0,0 +1,102 @@
+#include "eglcommon.h"
+
+#include <VG/openvg.h>
+
+const VGfloat white_color[4] = {1.0, 1.0, 1.0, 1.0};
+const VGfloat green_color[4] = {0.0, 1.0, 0.0, 0.8};
+const VGfloat black_color[4] = {0.0, 0.0, 0.0, 1.0};
+
+VGPath path;
+VGPaint fill;
+
+
+static void draw_point(VGfloat x, VGfloat y)
+{
+
+   static const VGubyte cmds[] = {VG_MOVE_TO_ABS, VG_LINE_TO_ABS, VG_LINE_TO_ABS,
+                                  VG_LINE_TO_ABS, VG_CLOSE_PATH};
+   const VGfloat coords[]   = {  x - 2,  y - 2,
+                                 x + 2,  y - 2,
+                                 x + 2,  y + 2,
+                                 x - 2,  y + 2};
+   VGPath path;
+   VGPaint fill;
+
+   path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1, 0, 0, 0,
+                       VG_PATH_CAPABILITY_ALL);
+   vgAppendPathData(path, 5, cmds, coords);
+
+   fill = vgCreatePaint();
+   vgSetParameterfv(fill, VG_PAINT_COLOR, 4, black_color);
+   vgSetPaint(fill, VG_FILL_PATH);
+
+   vgDrawPath(path, VG_FILL_PATH);
+
+   vgDestroyPath(path);
+   vgDestroyPaint(fill);
+}
+
+static void draw_marks(VGPath path)
+{
+    VGfloat point[2], tangent[2];
+    int i = 0;
+
+    for (i = 0; i < 1300; i += 50) {
+        vgPointAlongPath(path, 0, 6, i,
+                         point + 0, point + 1,
+                         tangent + 0, tangent + 1);
+        draw_point(point[0], point[1]);
+    }
+}
+
+static void
+init(void)
+{
+   static const VGubyte cmds[6] = {VG_MOVE_TO_ABS, VG_LINE_TO_ABS, VG_LINE_TO_ABS, VG_LINE_TO_ABS,
+                                   VG_LINE_TO_ABS, VG_CLOSE_PATH};
+   static const VGfloat coords[]   = {  0,  200,
+                                        300,  200,
+                                        50,   0,
+                                        150, 300,
+                                        250,   0};
+   path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1, 0, 0, 0,
+                       VG_PATH_CAPABILITY_ALL);
+   vgAppendPathData(path, 6, cmds, coords);
+
+   fill = vgCreatePaint();
+   vgSetParameterfv(fill, VG_PAINT_COLOR, 4, green_color);
+   vgSetPaint(fill, VG_FILL_PATH);
+
+   vgSetfv(VG_CLEAR_COLOR, 4, white_color);
+}
+
+/* new window size or exposure */
+static void
+reshape(int w, int h)
+{
+   vgLoadIdentity();
+}
+
+static void
+draw(void)
+{
+    VGfloat point[2], tangent[2];
+    int i = 0;
+
+    vgClear(0, 0, window_width(), window_height());
+
+    vgSetPaint(fill, VG_FILL_PATH);
+    vgDrawPath(path, VG_FILL_PATH);
+
+    draw_marks(path);
+
+
+    vgFlush();
+}
+
+
+int main(int argc, char **argv)
+{
+   return run(argc, argv, init, reshape,
+              draw, 0);
+}
-- 
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