From 3b21507274aa4f98644382903ae529c1fc2c7bd4 Mon Sep 17 00:00:00 2001
From: inmarket <andrewh@inmarket.com.au>
Date: Wed, 20 Aug 2014 01:36:33 +1000
Subject: GL3D GWIN window + demo

---
 3rdparty/tinygl-0.4-ugfx/src/zline.c | 84 ++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 3rdparty/tinygl-0.4-ugfx/src/zline.c

(limited to '3rdparty/tinygl-0.4-ugfx/src/zline.c')

diff --git a/3rdparty/tinygl-0.4-ugfx/src/zline.c b/3rdparty/tinygl-0.4-ugfx/src/zline.c
new file mode 100644
index 00000000..561064b0
--- /dev/null
+++ b/3rdparty/tinygl-0.4-ugfx/src/zline.c
@@ -0,0 +1,84 @@
+#include <stdlib.h>
+#include "zbuffer.h"
+
+#define ZCMP(z,zpix) ((z) >= (zpix))
+
+void ZB_plot(ZBuffer * zb, ZBufferPoint * p)
+{
+    unsigned short *pz;
+    PIXEL *pp;
+    int zz;
+
+    pz = zb->zbuf + (p->y * zb->xsize + p->x);
+    pp = (PIXEL *) ((char *) zb->pbuf + zb->linesize * p->y + p->x * PSZB);
+    zz = p->z >> ZB_POINT_Z_FRAC_BITS;
+    if (ZCMP(zz, *pz)) {
+#if TGL_FEATURE_RENDER_BITS == 24 
+        pp[0]=p->r>>8;
+        pp[1]=p->g>>8;
+        pp[2]=p->b>>8;
+#else
+	*pp = RGB_TO_PIXEL(p->r, p->g, p->b);
+#endif
+	*pz = zz;
+    }
+}
+
+#define INTERP_Z
+static void ZB_line_flat_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2, 
+                           int color)
+{
+#include "zline.h"
+}
+
+/* line with color interpolation */
+#define INTERP_Z
+#define INTERP_RGB
+static void ZB_line_interp_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
+{
+#include "zline.h"
+}
+
+/* no Z interpolation */
+
+static void ZB_line_flat(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2, 
+                             int color)
+{
+#include "zline.h"
+}
+
+#define INTERP_RGB
+static void ZB_line_interp(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
+{
+#include "zline.h"
+}
+
+void ZB_line_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
+{
+    int color1, color2;
+
+    color1 = RGB_TO_PIXEL(p1->r, p1->g, p1->b);
+    color2 = RGB_TO_PIXEL(p2->r, p2->g, p2->b);
+
+    /* choose if the line should have its color interpolated or not */
+    if (color1 == color2) {
+        ZB_line_flat_z(zb, p1, p2, color1);
+    } else {
+        ZB_line_interp_z(zb, p1, p2);
+    }
+}
+
+void ZB_line(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
+{
+    int color1, color2;
+
+    color1 = RGB_TO_PIXEL(p1->r, p1->g, p1->b);
+    color2 = RGB_TO_PIXEL(p2->r, p2->g, p2->b);
+
+    /* choose if the line should have its color interpolated or not */
+    if (color1 == color2) {
+        ZB_line_flat(zb, p1, p2, color1);
+    } else {
+        ZB_line_interp(zb, p1, p2);
+    }
+}
-- 
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