Blender  V3.3
zbuf.c
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1 /* SPDX-License-Identifier: GPL-2.0-or-later
2  * Copyright 2001-2002 NaN Holding BV. All rights reserved. */
3 
11 /*---------------------------------------------------------------------------*/
12 /* Common includes */
13 /*---------------------------------------------------------------------------*/
14 
15 #include <string.h>
16 
17 #include "MEM_guardedalloc.h"
18 
19 #include "BLI_math_base.h"
20 
21 /* own includes */
22 #include "zbuf.h"
23 
24 /* could enable at some point but for now there are far too many conversions */
25 #ifdef __GNUC__
26 # pragma GCC diagnostic ignored "-Wdouble-promotion"
27 #endif
28 
29 /* ****************** Spans ******************************* */
30 
31 void zbuf_alloc_span(ZSpan *zspan, int rectx, int recty)
32 {
33  memset(zspan, 0, sizeof(ZSpan));
34 
35  zspan->rectx = rectx;
36  zspan->recty = recty;
37 
38  zspan->span1 = MEM_mallocN(recty * sizeof(float), "zspan");
39  zspan->span2 = MEM_mallocN(recty * sizeof(float), "zspan");
40 }
41 
42 void zbuf_free_span(ZSpan *zspan)
43 {
44  if (zspan) {
45  MEM_SAFE_FREE(zspan->span1);
46  MEM_SAFE_FREE(zspan->span2);
47  }
48 }
49 
50 /* reset range for clipping */
51 static void zbuf_init_span(ZSpan *zspan)
52 {
53  zspan->miny1 = zspan->miny2 = zspan->recty + 1;
54  zspan->maxy1 = zspan->maxy2 = -1;
55  zspan->minp1 = zspan->maxp1 = zspan->minp2 = zspan->maxp2 = NULL;
56 }
57 
58 static void zbuf_add_to_span(ZSpan *zspan, const float v1[2], const float v2[2])
59 {
60  const float *minv, *maxv;
61  float *span;
62  float xx1, dx0, xs0;
63  int y, my0, my2;
64 
65  if (v1[1] < v2[1]) {
66  minv = v1;
67  maxv = v2;
68  }
69  else {
70  minv = v2;
71  maxv = v1;
72  }
73 
74  my0 = ceil(minv[1]);
75  my2 = floor(maxv[1]);
76 
77  if (my2 < 0 || my0 >= zspan->recty) {
78  return;
79  }
80 
81  /* clip top */
82  if (my2 >= zspan->recty) {
83  my2 = zspan->recty - 1;
84  }
85  /* clip bottom */
86  if (my0 < 0) {
87  my0 = 0;
88  }
89 
90  if (my0 > my2) {
91  return;
92  }
93  /* if (my0>my2) should still fill in, that way we get spans that skip nicely */
94 
95  xx1 = maxv[1] - minv[1];
96  if (xx1 > FLT_EPSILON) {
97  dx0 = (minv[0] - maxv[0]) / xx1;
98  xs0 = dx0 * (minv[1] - my2) + minv[0];
99  }
100  else {
101  dx0 = 0.0f;
102  xs0 = min_ff(minv[0], maxv[0]);
103  }
104 
105  /* empty span */
106  if (zspan->maxp1 == NULL) {
107  span = zspan->span1;
108  }
109  else { /* does it complete left span? */
110  if (maxv == zspan->minp1 || minv == zspan->maxp1) {
111  span = zspan->span1;
112  }
113  else {
114  span = zspan->span2;
115  }
116  }
117 
118  if (span == zspan->span1) {
119  // printf("left span my0 %d my2 %d\n", my0, my2);
120  if (zspan->minp1 == NULL || zspan->minp1[1] > minv[1]) {
121  zspan->minp1 = minv;
122  }
123  if (zspan->maxp1 == NULL || zspan->maxp1[1] < maxv[1]) {
124  zspan->maxp1 = maxv;
125  }
126  if (my0 < zspan->miny1) {
127  zspan->miny1 = my0;
128  }
129  if (my2 > zspan->maxy1) {
130  zspan->maxy1 = my2;
131  }
132  }
133  else {
134  // printf("right span my0 %d my2 %d\n", my0, my2);
135  if (zspan->minp2 == NULL || zspan->minp2[1] > minv[1]) {
136  zspan->minp2 = minv;
137  }
138  if (zspan->maxp2 == NULL || zspan->maxp2[1] < maxv[1]) {
139  zspan->maxp2 = maxv;
140  }
141  if (my0 < zspan->miny2) {
142  zspan->miny2 = my0;
143  }
144  if (my2 > zspan->maxy2) {
145  zspan->maxy2 = my2;
146  }
147  }
148 
149  for (y = my2; y >= my0; y--, xs0 += dx0) {
150  /* xs0 is the X-coordinate! */
151  span[y] = xs0;
152  }
153 }
154 
155 /*-----------------------------------------------------------*/
156 /* Functions */
157 /*-----------------------------------------------------------*/
158 
160  void *handle,
161  float *v1,
162  float *v2,
163  float *v3,
164  void (*func)(void *, int, int, float, float))
165 {
166  float x0, y0, x1, y1, x2, y2, z0, z1, z2;
167  float u, v, uxd, uyd, vxd, vyd, uy0, vy0, xx1;
168  const float *span1, *span2;
169  int i, j, x, y, sn1, sn2, rectx = zspan->rectx, my0, my2;
170 
171  /* init */
172  zbuf_init_span(zspan);
173 
174  /* set spans */
175  zbuf_add_to_span(zspan, v1, v2);
176  zbuf_add_to_span(zspan, v2, v3);
177  zbuf_add_to_span(zspan, v3, v1);
178 
179  /* clipped */
180  if (zspan->minp2 == NULL || zspan->maxp2 == NULL) {
181  return;
182  }
183 
184  my0 = max_ii(zspan->miny1, zspan->miny2);
185  my2 = min_ii(zspan->maxy1, zspan->maxy2);
186 
187  // printf("my %d %d\n", my0, my2);
188  if (my2 < my0) {
189  return;
190  }
191 
192  /* ZBUF DX DY, in floats still */
193  x1 = v1[0] - v2[0];
194  x2 = v2[0] - v3[0];
195  y1 = v1[1] - v2[1];
196  y2 = v2[1] - v3[1];
197 
198  z1 = 1.0f; /* (u1 - u2) */
199  z2 = 0.0f; /* (u2 - u3) */
200 
201  x0 = y1 * z2 - z1 * y2;
202  y0 = z1 * x2 - x1 * z2;
203  z0 = x1 * y2 - y1 * x2;
204 
205  if (z0 == 0.0f) {
206  return;
207  }
208 
209  xx1 = (x0 * v1[0] + y0 * v1[1]) / z0 + 1.0f;
210  uxd = -(double)x0 / (double)z0;
211  uyd = -(double)y0 / (double)z0;
212  uy0 = ((double)my2) * uyd + (double)xx1;
213 
214  z1 = -1.0f; /* (v1 - v2) */
215  z2 = 1.0f; /* (v2 - v3) */
216 
217  x0 = y1 * z2 - z1 * y2;
218  y0 = z1 * x2 - x1 * z2;
219 
220  xx1 = (x0 * v1[0] + y0 * v1[1]) / z0;
221  vxd = -(double)x0 / (double)z0;
222  vyd = -(double)y0 / (double)z0;
223  vy0 = ((double)my2) * vyd + (double)xx1;
224 
225  /* correct span */
226  span1 = zspan->span1 + my2;
227  span2 = zspan->span2 + my2;
228 
229  for (i = 0, y = my2; y >= my0; i++, y--, span1--, span2--) {
230 
231  sn1 = floor(min_ff(*span1, *span2));
232  sn2 = floor(max_ff(*span1, *span2));
233  sn1++;
234 
235  if (sn2 >= rectx) {
236  sn2 = rectx - 1;
237  }
238  if (sn1 < 0) {
239  sn1 = 0;
240  }
241 
242  u = (((double)sn1 * uxd) + uy0) - (i * uyd);
243  v = (((double)sn1 * vxd) + vy0) - (i * vyd);
244 
245  for (j = 0, x = sn1; x <= sn2; j++, x++) {
246  func(handle, x, y, u + (j * uxd), v + (j * vxd));
247  }
248  }
249 }
250 
251 /* end of zbuf.c */
MINLINE float max_ff(float a, float b)
MINLINE int min_ii(int a, int b)
MINLINE float min_ff(float a, float b)
MINLINE int max_ii(int a, int b)
typedef double(DMatrix)[4][4]
_GL_VOID GLfloat value _GL_VOID_RET _GL_VOID const GLuint GLboolean *residences _GL_BOOL_RET _GL_VOID GLsizei GLfloat GLfloat GLfloat GLfloat const GLubyte *bitmap _GL_VOID_RET _GL_VOID GLenum const void *lists _GL_VOID_RET _GL_VOID const GLdouble *equation _GL_VOID_RET _GL_VOID GLdouble GLdouble blue _GL_VOID_RET _GL_VOID GLfloat GLfloat blue _GL_VOID_RET _GL_VOID GLint GLint blue _GL_VOID_RET _GL_VOID GLshort GLshort blue _GL_VOID_RET _GL_VOID GLubyte GLubyte blue _GL_VOID_RET _GL_VOID GLuint GLuint blue _GL_VOID_RET _GL_VOID GLushort GLushort blue _GL_VOID_RET _GL_VOID GLbyte GLbyte GLbyte alpha _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble alpha _GL_VOID_RET _GL_VOID GLfloat GLfloat GLfloat alpha _GL_VOID_RET _GL_VOID GLint GLint GLint alpha _GL_VOID_RET _GL_VOID GLshort GLshort GLshort alpha _GL_VOID_RET _GL_VOID GLubyte GLubyte GLubyte alpha _GL_VOID_RET _GL_VOID GLuint GLuint GLuint alpha _GL_VOID_RET _GL_VOID GLushort GLushort GLushort alpha _GL_VOID_RET _GL_VOID GLenum mode _GL_VOID_RET _GL_VOID GLint GLsizei GLsizei GLenum type _GL_VOID_RET _GL_VOID GLsizei GLenum GLenum const void *pixels _GL_VOID_RET _GL_VOID const void *pointer _GL_VOID_RET _GL_VOID GLdouble v _GL_VOID_RET _GL_VOID GLfloat v _GL_VOID_RET _GL_VOID GLint GLint i2 _GL_VOID_RET _GL_VOID GLint j _GL_VOID_RET _GL_VOID GLfloat param _GL_VOID_RET _GL_VOID GLint param _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble GLdouble GLdouble zFar _GL_VOID_RET _GL_UINT GLdouble *equation _GL_VOID_RET _GL_VOID GLenum GLint *params _GL_VOID_RET _GL_VOID GLenum GLfloat *v _GL_VOID_RET _GL_VOID GLenum GLfloat *params _GL_VOID_RET _GL_VOID GLfloat *values _GL_VOID_RET _GL_VOID GLushort *values _GL_VOID_RET _GL_VOID GLenum GLfloat *params _GL_VOID_RET _GL_VOID GLenum GLdouble *params _GL_VOID_RET _GL_VOID GLenum GLint *params _GL_VOID_RET _GL_VOID GLsizei const void *pointer _GL_VOID_RET _GL_VOID GLsizei const void *pointer _GL_VOID_RET _GL_BOOL GLfloat param _GL_VOID_RET _GL_VOID GLint param _GL_VOID_RET _GL_VOID GLenum GLfloat param _GL_VOID_RET _GL_VOID GLenum GLint param _GL_VOID_RET _GL_VOID GLushort pattern _GL_VOID_RET _GL_VOID GLdouble GLdouble GLint GLint const GLdouble *points _GL_VOID_RET _GL_VOID GLdouble GLdouble GLint GLint GLdouble GLdouble GLint GLint const GLdouble *points _GL_VOID_RET _GL_VOID GLdouble GLdouble u2 _GL_VOID_RET _GL_VOID GLdouble GLdouble GLint GLdouble GLdouble v2 _GL_VOID_RET _GL_VOID GLenum GLfloat param _GL_VOID_RET _GL_VOID GLenum GLint param _GL_VOID_RET _GL_VOID GLenum mode _GL_VOID_RET _GL_VOID GLdouble GLdouble nz _GL_VOID_RET _GL_VOID GLfloat GLfloat nz _GL_VOID_RET _GL_VOID GLint GLint nz _GL_VOID_RET _GL_VOID GLshort GLshort nz _GL_VOID_RET _GL_VOID GLsizei const void *pointer _GL_VOID_RET _GL_VOID GLsizei const GLfloat *values _GL_VOID_RET _GL_VOID GLsizei const GLushort *values _GL_VOID_RET _GL_VOID GLint param _GL_VOID_RET _GL_VOID const GLuint const GLclampf *priorities _GL_VOID_RET _GL_VOID GLdouble y _GL_VOID_RET _GL_VOID GLfloat y _GL_VOID_RET _GL_VOID GLint y _GL_VOID_RET _GL_VOID GLshort y _GL_VOID_RET _GL_VOID GLdouble GLdouble z _GL_VOID_RET _GL_VOID GLfloat GLfloat z _GL_VOID_RET _GL_VOID GLint GLint z _GL_VOID_RET _GL_VOID GLshort GLshort z _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble w _GL_VOID_RET _GL_VOID GLfloat GLfloat GLfloat w _GL_VOID_RET _GL_VOID GLint GLint GLint w _GL_VOID_RET _GL_VOID GLshort GLshort GLshort w _GL_VOID_RET _GL_VOID GLdouble y1
_GL_VOID GLfloat value _GL_VOID_RET _GL_VOID const GLuint GLboolean *residences _GL_BOOL_RET _GL_VOID GLsizei GLfloat GLfloat GLfloat GLfloat const GLubyte *bitmap _GL_VOID_RET _GL_VOID GLenum const void *lists _GL_VOID_RET _GL_VOID const GLdouble *equation _GL_VOID_RET _GL_VOID GLdouble GLdouble blue _GL_VOID_RET _GL_VOID GLfloat GLfloat blue _GL_VOID_RET _GL_VOID GLint GLint blue _GL_VOID_RET _GL_VOID GLshort GLshort blue _GL_VOID_RET _GL_VOID GLubyte GLubyte blue _GL_VOID_RET _GL_VOID GLuint GLuint blue _GL_VOID_RET _GL_VOID GLushort GLushort blue _GL_VOID_RET _GL_VOID GLbyte GLbyte GLbyte alpha _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble alpha _GL_VOID_RET _GL_VOID GLfloat GLfloat GLfloat alpha _GL_VOID_RET _GL_VOID GLint GLint GLint alpha _GL_VOID_RET _GL_VOID GLshort GLshort GLshort alpha _GL_VOID_RET _GL_VOID GLubyte GLubyte GLubyte alpha _GL_VOID_RET _GL_VOID GLuint GLuint GLuint alpha _GL_VOID_RET _GL_VOID GLushort GLushort GLushort alpha _GL_VOID_RET _GL_VOID GLenum mode _GL_VOID_RET _GL_VOID GLint y
_GL_VOID GLfloat value _GL_VOID_RET _GL_VOID const GLuint GLboolean *residences _GL_BOOL_RET _GL_VOID GLsizei GLfloat GLfloat GLfloat GLfloat const GLubyte *bitmap _GL_VOID_RET _GL_VOID GLenum const void *lists _GL_VOID_RET _GL_VOID const GLdouble *equation _GL_VOID_RET _GL_VOID GLdouble GLdouble blue _GL_VOID_RET _GL_VOID GLfloat GLfloat blue _GL_VOID_RET _GL_VOID GLint GLint blue _GL_VOID_RET _GL_VOID GLshort GLshort blue _GL_VOID_RET _GL_VOID GLubyte GLubyte blue _GL_VOID_RET _GL_VOID GLuint GLuint blue _GL_VOID_RET _GL_VOID GLushort GLushort blue _GL_VOID_RET _GL_VOID GLbyte GLbyte GLbyte alpha _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble alpha _GL_VOID_RET _GL_VOID GLfloat GLfloat GLfloat alpha _GL_VOID_RET _GL_VOID GLint GLint GLint alpha _GL_VOID_RET _GL_VOID GLshort GLshort GLshort alpha _GL_VOID_RET _GL_VOID GLubyte GLubyte GLubyte alpha _GL_VOID_RET _GL_VOID GLuint GLuint GLuint alpha _GL_VOID_RET _GL_VOID GLushort GLushort GLushort alpha _GL_VOID_RET _GL_VOID GLenum mode _GL_VOID_RET _GL_VOID GLint GLsizei GLsizei GLenum type _GL_VOID_RET _GL_VOID GLsizei GLenum GLenum const void *pixels _GL_VOID_RET _GL_VOID const void *pointer _GL_VOID_RET _GL_VOID GLdouble v _GL_VOID_RET _GL_VOID GLfloat v _GL_VOID_RET _GL_VOID GLint GLint i2 _GL_VOID_RET _GL_VOID GLint j _GL_VOID_RET _GL_VOID GLfloat param _GL_VOID_RET _GL_VOID GLint param _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble GLdouble GLdouble zFar _GL_VOID_RET _GL_UINT GLdouble *equation _GL_VOID_RET _GL_VOID GLenum GLint *params _GL_VOID_RET _GL_VOID GLenum GLfloat *v _GL_VOID_RET _GL_VOID GLenum GLfloat *params _GL_VOID_RET _GL_VOID GLfloat *values _GL_VOID_RET _GL_VOID GLushort *values _GL_VOID_RET _GL_VOID GLenum GLfloat *params _GL_VOID_RET _GL_VOID GLenum GLdouble *params _GL_VOID_RET _GL_VOID GLenum GLint *params _GL_VOID_RET _GL_VOID GLsizei const void *pointer _GL_VOID_RET _GL_VOID GLsizei const void *pointer _GL_VOID_RET _GL_BOOL GLfloat param _GL_VOID_RET _GL_VOID GLint param _GL_VOID_RET _GL_VOID GLenum GLfloat param _GL_VOID_RET _GL_VOID GLenum GLint param _GL_VOID_RET _GL_VOID GLushort pattern _GL_VOID_RET _GL_VOID GLdouble GLdouble GLint GLint const GLdouble *points _GL_VOID_RET _GL_VOID GLdouble GLdouble GLint GLint GLdouble GLdouble GLint GLint const GLdouble *points _GL_VOID_RET _GL_VOID GLdouble GLdouble u2 _GL_VOID_RET _GL_VOID GLdouble GLdouble GLint GLdouble GLdouble v2 _GL_VOID_RET _GL_VOID GLenum GLfloat param _GL_VOID_RET _GL_VOID GLenum GLint param _GL_VOID_RET _GL_VOID GLenum mode _GL_VOID_RET _GL_VOID GLdouble GLdouble nz _GL_VOID_RET _GL_VOID GLfloat GLfloat nz _GL_VOID_RET _GL_VOID GLint GLint nz _GL_VOID_RET _GL_VOID GLshort GLshort nz _GL_VOID_RET _GL_VOID GLsizei const void *pointer _GL_VOID_RET _GL_VOID GLsizei const GLfloat *values _GL_VOID_RET _GL_VOID GLsizei const GLushort *values _GL_VOID_RET _GL_VOID GLint param _GL_VOID_RET _GL_VOID const GLuint const GLclampf *priorities _GL_VOID_RET _GL_VOID GLdouble y _GL_VOID_RET _GL_VOID GLfloat y _GL_VOID_RET _GL_VOID GLint y _GL_VOID_RET _GL_VOID GLshort y _GL_VOID_RET _GL_VOID GLdouble GLdouble z _GL_VOID_RET _GL_VOID GLfloat GLfloat z _GL_VOID_RET _GL_VOID GLint GLint z _GL_VOID_RET _GL_VOID GLshort GLshort z _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble w _GL_VOID_RET _GL_VOID GLfloat GLfloat GLfloat w _GL_VOID_RET _GL_VOID GLint GLint GLint w _GL_VOID_RET _GL_VOID GLshort GLshort GLshort w _GL_VOID_RET _GL_VOID GLdouble GLdouble x2
_GL_VOID GLfloat value _GL_VOID_RET _GL_VOID const GLuint GLboolean *residences _GL_BOOL_RET _GL_VOID GLsizei GLfloat GLfloat GLfloat GLfloat const GLubyte *bitmap _GL_VOID_RET _GL_VOID GLenum const void *lists _GL_VOID_RET _GL_VOID const GLdouble *equation _GL_VOID_RET _GL_VOID GLdouble GLdouble blue _GL_VOID_RET _GL_VOID GLfloat GLfloat blue _GL_VOID_RET _GL_VOID GLint GLint blue _GL_VOID_RET _GL_VOID GLshort GLshort blue _GL_VOID_RET _GL_VOID GLubyte GLubyte blue _GL_VOID_RET _GL_VOID GLuint GLuint blue _GL_VOID_RET _GL_VOID GLushort GLushort blue _GL_VOID_RET _GL_VOID GLbyte GLbyte GLbyte alpha _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble alpha _GL_VOID_RET _GL_VOID GLfloat GLfloat GLfloat alpha _GL_VOID_RET _GL_VOID GLint GLint GLint alpha _GL_VOID_RET _GL_VOID GLshort GLshort GLshort alpha _GL_VOID_RET _GL_VOID GLubyte GLubyte GLubyte alpha _GL_VOID_RET _GL_VOID GLuint GLuint GLuint alpha _GL_VOID_RET _GL_VOID GLushort GLushort GLushort alpha _GL_VOID_RET _GL_VOID GLenum mode _GL_VOID_RET _GL_VOID GLint GLsizei GLsizei GLenum type _GL_VOID_RET _GL_VOID GLsizei GLenum GLenum const void *pixels _GL_VOID_RET _GL_VOID const void *pointer _GL_VOID_RET _GL_VOID GLdouble v _GL_VOID_RET _GL_VOID GLfloat v _GL_VOID_RET _GL_VOID GLint GLint i2 _GL_VOID_RET _GL_VOID GLint j _GL_VOID_RET _GL_VOID GLfloat param _GL_VOID_RET _GL_VOID GLint param _GL_VOID_RET _GL_VOID GLdouble GLdouble GLdouble GLdouble GLdouble zFar _GL_VOID_RET _GL_UINT GLdouble *equation _GL_VOID_RET _GL_VOID GLenum GLint *params _GL_VOID_RET _GL_VOID GLenum GLfloat *v _GL_VOID_RET _GL_VOID GLenum GLfloat *params _GL_VOID_RET _GL_VOID GLfloat *values _GL_VOID_RET _GL_VOID GLushort *values _GL_VOID_RET _GL_VOID GLenum GLfloat *params _GL_VOID_RET _GL_VOID GLenum GLdouble *params _GL_VOID_RET _GL_VOID GLenum GLint *params _GL_VOID_RET _GL_VOID GLsizei const void *pointer _GL_VOID_RET _GL_VOID GLsizei const void *pointer _GL_VOID_RET _GL_BOOL GLfloat param _GL_VOID_RET _GL_VOID GLint param _GL_VOID_RET _GL_VOID GLenum GLfloat param _GL_VOID_RET _GL_VOID GLenum GLint param _GL_VOID_RET _GL_VOID GLushort pattern _GL_VOID_RET _GL_VOID GLdouble GLdouble GLint GLint const GLdouble *points _GL_VOID_RET _GL_VOID GLdouble GLdouble GLint GLint GLdouble v1
Read Guarded memory(de)allocation.
#define MEM_SAFE_FREE(v)
ATTR_WARN_UNUSED_RESULT const BMVert * v2
ATTR_WARN_UNUSED_RESULT const BMVert * v
void *(* MEM_mallocN)(size_t len, const char *str)
Definition: mallocn.c:33
ccl_device_inline float3 ceil(const float3 &a)
Definition: math_float3.h:363
T floor(const T &a)
Definition: zbuf.h:14
float * span2
Definition: zbuf.h:19
const float * maxp2
Definition: zbuf.h:18
int maxy2
Definition: zbuf.h:17
int miny1
Definition: zbuf.h:17
const float * minp2
Definition: zbuf.h:18
const float * maxp1
Definition: zbuf.h:18
int maxy1
Definition: zbuf.h:17
float * span1
Definition: zbuf.h:19
int recty
Definition: zbuf.h:15
int miny2
Definition: zbuf.h:17
int rectx
Definition: zbuf.h:15
const float * minp1
Definition: zbuf.h:18
void zspan_scanconvert(ZSpan *zspan, void *handle, float *v1, float *v2, float *v3, void(*func)(void *, int, int, float, float))
Definition: zbuf.c:159
static void zbuf_init_span(ZSpan *zspan)
Definition: zbuf.c:51
void zbuf_alloc_span(ZSpan *zspan, int rectx, int recty)
Definition: zbuf.c:31
void zbuf_free_span(ZSpan *zspan)
Definition: zbuf.c:42
static void zbuf_add_to_span(ZSpan *zspan, const float v1[2], const float v2[2])
Definition: zbuf.c:58