1 files changed, 153 insertions, 0 deletions
diff --git a/3rdparty/tinygl-0.4-ugfx/src/zbuffer.h b/3rdparty/tinygl-0.4-ugfx/src/zbuffer.h
new file mode 100644
index 00000000..b73e59fb
--- /dev/null
+++ b/3rdparty/tinygl-0.4-ugfx/src/zbuffer.h
@@ -0,0 +1,153 @@
+#ifndef _tgl_zbuffer_h_
+#define _tgl_zbuffer_h_
+
+/*
+ * Z buffer
+ */
+
+#include "zfeatures.h"
+
+#define ZB_Z_BITS 16
+
+#define ZB_POINT_Z_FRAC_BITS 14
+
+#define ZB_POINT_S_MIN ( (1<<13) )
+#define ZB_POINT_S_MAX ( (1<<22)-(1<<13) )
+#define ZB_POINT_T_MIN ( (1<<21) )
+#define ZB_POINT_T_MAX ( (1<<30)-(1<<21) )
+
+#define ZB_POINT_RED_MIN ( (1<<10) )
+#define ZB_POINT_RED_MAX ( (1<<16)-(1<<10) )
+#define ZB_POINT_GREEN_MIN ( (1<<9) )
+#define ZB_POINT_GREEN_MAX ( (1<<16)-(1<<9) )
+#define ZB_POINT_BLUE_MIN ( (1<<10) )
+#define ZB_POINT_BLUE_MAX ( (1<<16)-(1<<10) )
+
+/* display modes */
+#define ZB_MODE_5R6G5B  1  /* true color 16 bits */
+#define ZB_MODE_INDEX   2  /* color index 8 bits */
+#define ZB_MODE_RGBA    3  /* 32 bit rgba mode */
+#define ZB_MODE_RGB24   4  /* 24 bit rgb mode */
+#define ZB_NB_COLORS    225 /* number of colors for 8 bit display */
+
+#if TGL_FEATURE_RENDER_BITS == 15
+
+#define RGB_TO_PIXEL(r,g,b) \
+  ((((r) >> 1) & 0x7c00) | (((g) >> 6) & 0x03e0) | ((b) >> 11))
+typedef unsigned short PIXEL;
+/* bytes per pixel */
+#define PSZB 2 
+/* bits per pixel = (1 << PSZH) */
+#define PSZSH 4 
+
+#elif TGL_FEATURE_RENDER_BITS == 16
+
+/* 16 bit mode */
+#define RGB_TO_PIXEL(r,g,b) \
+  (((r) & 0xF800) | (((g) >> 5) & 0x07E0) | ((b) >> 11))
+typedef unsigned short PIXEL;
+#define PSZB 2 
+#define PSZSH 4 
+
+#elif TGL_FEATURE_RENDER_BITS == 24
+
+#define RGB_TO_PIXEL(r,g,b) \
+  ((((r) << 8) & 0xff0000) | ((g) & 0xff00) | ((b) >> 8))
+typedef unsigned char PIXEL;
+#define PSZB 3
+#define PSZSH 5
+
+#elif TGL_FEATURE_RENDER_BITS == 32
+
+#define RGB_TO_PIXEL(r,g,b) \
+  ((((r) << 8) & 0xff0000) | ((g) & 0xff00) | ((b) >> 8))
+typedef unsigned int PIXEL;
+#define PSZB 4
+#define PSZSH 5
+
+#else
+
+#error Incorrect number of bits per pixel
+
+#endif
+
+typedef struct {
+    int xsize,ysize;
+    int linesize; /* line size, in bytes */
+    int mode;
+    
+    unsigned short *zbuf;
+    PIXEL *pbuf;
+    int frame_buffer_allocated;
+    
+    int nb_colors;
+    unsigned char *dctable;
+    int *ctable;
+    PIXEL *current_texture;
+} ZBuffer;
+
+typedef struct {
+  int x,y,z;     /* integer coordinates in the zbuffer */
+  int s,t;       /* coordinates for the mapping */
+  int r,g,b;     /* color indexes */
+  
+  float sz,tz;   /* temporary coordinates for mapping */
+} ZBufferPoint;
+
+/* zbuffer.c */
+
+ZBuffer *ZB_open(int xsize,int ysize,int mode,
+		 int nb_colors,
+		 unsigned char *color_indexes,
+		 int *color_table,
+		 void *frame_buffer);
+
+
+void ZB_close(ZBuffer *zb);
+
+void ZB_resize(ZBuffer *zb,void *frame_buffer,int xsize,int ysize);
+void ZB_clear(ZBuffer *zb,int clear_z,int z,
+	      int clear_color,int r,int g,int b);
+/* linesize is in BYTES */
+void ZB_copyFrameBuffer(ZBuffer *zb,void *buf,int linesize);
+
+/* zdither.c */
+
+void ZB_initDither(ZBuffer *zb,int nb_colors,
+		   unsigned char *color_indexes,int *color_table);
+void ZB_closeDither(ZBuffer *zb);
+void ZB_ditherFrameBuffer(ZBuffer *zb,unsigned char *dest,
+			  int linesize);
+
+/* zline.c */
+
+void ZB_plot(ZBuffer *zb,ZBufferPoint *p);
+void ZB_line(ZBuffer *zb,ZBufferPoint *p1,ZBufferPoint *p2);
+void ZB_line_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2);
+
+/* ztriangle.c */
+
+void ZB_setTexture(ZBuffer *zb, PIXEL *texture);
+
+void ZB_fillTriangleFlat(ZBuffer *zb,
+		 ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3);
+
+void ZB_fillTriangleSmooth(ZBuffer *zb,
+		   ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3);
+
+void ZB_fillTriangleMapping(ZBuffer *zb,
+		    ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3);
+
+void ZB_fillTriangleMappingPerspective(ZBuffer *zb,
+                    ZBufferPoint *p0,ZBufferPoint *p1,ZBufferPoint *p2);
+
+
+typedef void (*ZB_fillTriangleFunc)(ZBuffer  *,
+	    ZBufferPoint *,ZBufferPoint *,ZBufferPoint *);
+
+/* memory.c */
+void gl_free(void *p);
+void *gl_malloc(int size);
+void *gl_zalloc(int size);
+
+#endif /* _tgl_zbuffer_h_ */