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.h | 122 +++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 3rdparty/tinygl-0.4-ugfx/src/zline.h

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

diff --git a/3rdparty/tinygl-0.4-ugfx/src/zline.h b/3rdparty/tinygl-0.4-ugfx/src/zline.h
new file mode 100644
index 00000000..00408b45
--- /dev/null
+++ b/3rdparty/tinygl-0.4-ugfx/src/zline.h
@@ -0,0 +1,122 @@
+{
+    int n, dx, dy, sx, pp_inc_1, pp_inc_2;
+    register int a;
+    register PIXEL *pp;
+#if defined(INTERP_RGB) || TGL_FEATURE_RENDER_BITS == 24
+    register unsigned int r, g, b;
+#endif
+#ifdef INTERP_RGB
+    register unsigned int rinc, ginc, binc;
+#endif
+#ifdef INTERP_Z
+    register unsigned short *pz;
+    int zinc;
+    register int z, zz;
+#endif
+
+    if (p1->y > p2->y || (p1->y == p2->y && p1->x > p2->x)) {
+	ZBufferPoint *tmp;
+	tmp = p1;
+	p1 = p2;
+	p2 = tmp;
+    }
+    sx = zb->xsize;
+    pp = (PIXEL *) ((char *) zb->pbuf + zb->linesize * p1->y + p1->x * PSZB);
+#ifdef INTERP_Z
+    pz = zb->zbuf + (p1->y * sx + p1->x);
+    z = p1->z;
+#endif
+
+    dx = p2->x - p1->x;
+    dy = p2->y - p1->y;
+#ifdef INTERP_RGB
+    r = p2->r << 8;
+    g = p2->g << 8;
+    b = p2->b << 8;
+#elif TGL_FEATURE_RENDER_BITS == 24
+    /* for 24 bits, we store the colors in different variables */
+    r = p2->r >> 8;
+    g = p2->g >> 8;
+    b = p2->b >> 8;
+#endif
+
+#undef RGB
+#ifdef INTERP_RGB
+#define RGB(x) x
+#if TGL_FEATURE_RENDER_BITS == 24
+#define RGBPIXEL pp[0] = r >> 16, pp[1] = g >> 16, pp[2] = b >> 16
+#else
+#define RGBPIXEL *pp = RGB_TO_PIXEL(r >> 8,g >> 8,b >> 8)
+#endif
+#else /* INTERP_RGB */
+#define RGB(x)
+#if TGL_FEATURE_RENDER_BITS == 24
+#define RGBPIXEL pp[0] = r, pp[1] = g, pp[2] = b
+#else
+#define RGBPIXEL *pp = color
+#endif
+#endif /* INTERP_RGB */
+
+#ifdef INTERP_Z
+#define ZZ(x) x
+#define PUTPIXEL() 				\
+  {						\
+    zz=z >> ZB_POINT_Z_FRAC_BITS;		\
+    if (ZCMP(zz,*pz))  { 			\
+      RGBPIXEL;	\
+      *pz=zz; 					\
+    }						\
+  }
+#else /* INTERP_Z */
+#define ZZ(x)
+#define PUTPIXEL() RGBPIXEL
+#endif /* INTERP_Z */
+
+#define DRAWLINE(dx,dy,inc_1,inc_2) \
+    n=dx;\
+    ZZ(zinc=(p2->z-p1->z)/n);\
+    RGB(rinc=((p2->r-p1->r) << 8)/n;\
+        ginc=((p2->g-p1->g) << 8)/n;\
+        binc=((p2->b-p1->b) << 8)/n);\
+    a=2*dy-dx;\
+    dy=2*dy;\
+    dx=2*dx-dy;\
+    pp_inc_1 = (inc_1) * PSZB;\
+    pp_inc_2 = (inc_2) * PSZB;\
+    do {\
+        PUTPIXEL();\
+        ZZ(z+=zinc);\
+        RGB(r+=rinc;g+=ginc;b+=binc);\
+        if (a>0) { pp=(PIXEL *)((char *)pp + pp_inc_1); ZZ(pz+=(inc_1));  a-=dx; }\
+	else { pp=(PIXEL *)((char *)pp + pp_inc_2); ZZ(pz+=(inc_2)); a+=dy; }\
+    } while (--n >= 0);
+
+/* fin macro */
+
+    if (dx == 0 && dy == 0) {
+	PUTPIXEL();
+    } else if (dx > 0) {
+	if (dx >= dy) {
+	    DRAWLINE(dx, dy, sx + 1, 1);
+	} else {
+	    DRAWLINE(dy, dx, sx + 1, sx);
+	}
+    } else {
+	dx = -dx;
+	if (dx >= dy) {
+	    DRAWLINE(dx, dy, sx - 1, -1);
+	} else {
+	    DRAWLINE(dy, dx, sx - 1, sx);
+	}
+    }
+}
+
+#undef INTERP_Z
+#undef INTERP_RGB
+
+/* internal defines */
+#undef DRAWLINE
+#undef PUTPIXEL
+#undef ZZ
+#undef RGB
+#undef RGBPIXEL 
-- 
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