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Diffstat (limited to 'progs/openvg/trivial/lingrad.c')
-rw-r--r--progs/openvg/trivial/lingrad.c87
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);
+}