1 files changed, 87 insertions, 0 deletions
diff --git a/progs/openvg/trivial/lingrad.c b/progs/openvg/trivial/lingrad.c
new file mode 100644
index 0000000000..bcaad1f101
--- /dev/null
+++ b/progs/openvg/trivial/lingrad.c
@@ -0,0 +1,87 @@
+#include "eglcommon.h"
+
+#include <VG/openvg.h>
+
+#include <stdio.h>
+#include <string.h>
+
+static const VGfloat white_color[4] = {1.0, 1.0, 1.0, 1.0};
+
+static VGPath path;
+static VGPaint fill;
+
+VGColorRampSpreadMode spread = VG_COLOR_RAMP_SPREAD_PAD;
+
+static void
+init(void)
+{
+   static const VGubyte sqrCmds[5] = {VG_MOVE_TO_ABS, VG_HLINE_TO_ABS, VG_VLINE_TO_ABS, VG_HLINE_TO_ABS, VG_CLOSE_PATH};
+   static const VGfloat sqrCoords[5]   = {0.0f, 0.0f, 400.0f, 400.0f, 0.0f};
+
+   VGfloat rampStop[] = {0.00f, 1.0f, 1.0f, 1.0f, 1.0f,
+                         0.33f, 1.0f, 0.0f, 0.0f, 1.0f,
+                         0.66f, 0.0f, 1.0f, 0.0f, 1.0f,
+                         1.00f, 0.0f, 0.0f,  1.0f, 1.0f};
+   VGfloat linearGradient[4] = {100.0f, 100.0f, 300.0f, 300.0f};
+
+   path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1, 0, 0, 0,
+                       VG_PATH_CAPABILITY_APPEND_TO);
+   vgAppendPathData(path, 5, sqrCmds, sqrCoords);
+
+   fill = vgCreatePaint();
+   vgSetPaint(fill, VG_FILL_PATH);
+
+   vgSetParameteri(fill, VG_PAINT_TYPE, VG_PAINT_TYPE_LINEAR_GRADIENT);
+   vgSetParameteri(fill, VG_PAINT_COLOR_RAMP_SPREAD_MODE, spread);
+   vgSetParameterfv(fill, VG_PAINT_LINEAR_GRADIENT, 4, linearGradient);
+   vgSetParameterfv(fill, VG_PAINT_COLOR_RAMP_STOPS, 20, rampStop);
+
+   vgSetfv(VG_CLEAR_COLOR, 4, white_color);
+}
+
+/* new window size or exposure */
+static void
+reshape(int w, int h)
+{
+   vgLoadIdentity();
+}
+
+static void
+draw(void)
+{
+   vgClear(0, 0, window_width(), window_height());
+
+   vgDrawPath(path, VG_FILL_PATH);
+
+   vgFlush();
+}
+
+
+int main(int argc, char **argv)
+{
+   if (argc > 1) {
+      const char *arg = argv[1];
+      if (!strcmp("-pad", arg))
+         spread = VG_COLOR_RAMP_SPREAD_PAD;
+      else if (!strcmp("-repeat", arg))
+         spread = VG_COLOR_RAMP_SPREAD_REPEAT;
+      else if (!strcmp("-reflect", arg))
+         spread = VG_COLOR_RAMP_SPREAD_REFLECT;
+   }
+
+   switch(spread) {
+   case VG_COLOR_RAMP_SPREAD_PAD:
+      printf("Using spread mode: pad\n");
+      break;
+   case VG_COLOR_RAMP_SPREAD_REPEAT:
+      printf("Using spread mode: repeat\n");
+      break;
+   case VG_COLOR_RAMP_SPREAD_REFLECT:
+      printf("Using spread mode: reflect\n");
+   }
+
+   set_window_size(400, 400);
+
+   return run(argc, argv, init, reshape,
+              draw, 0);
+}