api_validate.c revision d8c6719f95b1543296ac954f95d13b048ae48634 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.1
4 *
5 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25#include "glheader.h"
26#include "api_validate.h"
27#include "context.h"
28#include "imports.h"
29#include "mtypes.h"
30#include "state.h"
31
32
33/**
34 * Find the max index in the given element/index buffer
35 */
36static GLuint
37max_buffer_index(GLcontext *ctx, GLuint count, GLenum type,
38                 const void *indices,
39                 struct gl_buffer_object *elementBuf)
40{
41   const GLubyte *map = NULL;
42   GLuint max = 0;
43   GLint i;
44
45   if (elementBuf->Name) {
46      /* elements are in a user-defined buffer object.  need to map it */
47      map = ctx->Driver.MapBuffer(ctx,
48                                  GL_ELEMENT_ARRAY_BUFFER_ARB,
49                                  GL_READ_ONLY,
50                                  elementBuf);
51      /* Actual address is the sum of pointers */
52      indices = (const GLvoid *) ADD_POINTERS(map, (const GLubyte *) indices);
53   }
54
55   if (type == GL_UNSIGNED_INT) {
56      for (i = 0; i < count; i++)
57         if (((GLuint *) indices)[i] > max)
58            max = ((GLuint *) indices)[i];
59   }
60   else if (type == GL_UNSIGNED_SHORT) {
61      for (i = 0; i < count; i++)
62         if (((GLushort *) indices)[i] > max)
63            max = ((GLushort *) indices)[i];
64   }
65   else {
66      ASSERT(type == GL_UNSIGNED_BYTE);
67      for (i = 0; i < count; i++)
68         if (((GLubyte *) indices)[i] > max)
69            max = ((GLubyte *) indices)[i];
70   }
71
72   if (map) {
73      ctx->Driver.UnmapBuffer(ctx,
74                              GL_ELEMENT_ARRAY_BUFFER_ARB,
75                              ctx->Array.ElementArrayBufferObj);
76   }
77
78   return max;
79}
80
81
82GLboolean
83_mesa_validate_DrawElements(GLcontext *ctx,
84			    GLenum mode, GLsizei count, GLenum type,
85			    const GLvoid *indices)
86{
87   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx,  GL_FALSE);
88
89   if (count <= 0) {
90      if (count < 0)
91	 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" );
92      return GL_FALSE;
93   }
94
95   if (mode > GL_POLYGON) {
96      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" );
97      return GL_FALSE;
98   }
99
100   if (type != GL_UNSIGNED_INT &&
101       type != GL_UNSIGNED_BYTE &&
102       type != GL_UNSIGNED_SHORT)
103   {
104      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" );
105      return GL_FALSE;
106   }
107
108   if (ctx->NewState)
109      _mesa_update_state(ctx);
110
111   /* Always need vertex positions */
112   if (!ctx->Array.ArrayObj->Vertex.Enabled
113       && !(ctx->VertexProgram._Enabled
114            && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
115      return GL_FALSE;
116
117   /* Vertex buffer object tests */
118   if (ctx->Array.ElementArrayBufferObj->Name) {
119      /* use indices in the buffer object */
120      GLuint indexBytes;
121
122      if (type == GL_UNSIGNED_INT) {
123         indexBytes = count * sizeof(GLuint);
124      }
125      else if (type == GL_UNSIGNED_BYTE) {
126         indexBytes = count * sizeof(GLubyte);
127      }
128      else {
129         ASSERT(type == GL_UNSIGNED_SHORT);
130         indexBytes = count * sizeof(GLushort);
131      }
132
133      /* make sure count doesn't go outside buffer bounds */
134      if (indexBytes > ctx->Array.ElementArrayBufferObj->Size) {
135         _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
136         return GL_FALSE;
137      }
138   }
139   else {
140      /* not using a VBO */
141      if (!indices)
142         return GL_FALSE;
143   }
144
145   if (ctx->Const.CheckArrayBounds) {
146      /* find max array index */
147      GLuint max = max_buffer_index(ctx, count, type, indices,
148                                    ctx->Array.ElementArrayBufferObj);
149      if (max >= ctx->Array._MaxElement) {
150         /* the max element is out of bounds of one or more enabled arrays */
151         return GL_FALSE;
152      }
153   }
154
155   return GL_TRUE;
156}
157
158
159GLboolean
160_mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
161				 GLuint start, GLuint end,
162				 GLsizei count, GLenum type,
163				 const GLvoid *indices)
164{
165   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
166
167   if (count <= 0) {
168      if (count < 0)
169	 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
170      return GL_FALSE;
171   }
172
173   if (mode > GL_POLYGON) {
174      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
175      return GL_FALSE;
176   }
177
178   if (end < start) {
179      _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
180      return GL_FALSE;
181   }
182
183   if (type != GL_UNSIGNED_INT &&
184       type != GL_UNSIGNED_BYTE &&
185       type != GL_UNSIGNED_SHORT) {
186      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
187      return GL_FALSE;
188   }
189
190   if (ctx->NewState)
191      _mesa_update_state(ctx);
192
193   /* Always need vertex positions */
194   if (!ctx->Array.ArrayObj->Vertex.Enabled
195       && !(ctx->VertexProgram._Enabled
196            && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
197      return GL_FALSE;
198
199   /* Vertex buffer object tests */
200   if (ctx->Array.ElementArrayBufferObj->Name) {
201      /* use indices in the buffer object */
202      GLuint indexBytes;
203
204      if (type == GL_UNSIGNED_INT) {
205         indexBytes = count * sizeof(GLuint);
206      }
207      else if (type == GL_UNSIGNED_BYTE) {
208         indexBytes = count * sizeof(GLubyte);
209      }
210      else {
211         ASSERT(type == GL_UNSIGNED_SHORT);
212         indexBytes = count * sizeof(GLushort);
213      }
214
215      /* make sure count doesn't go outside buffer bounds */
216      if (indexBytes > ctx->Array.ElementArrayBufferObj->Size) {
217         _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
218         return GL_FALSE;
219      }
220   }
221   else {
222      /* not using a VBO */
223      if (!indices)
224         return GL_FALSE;
225   }
226
227   if (ctx->Const.CheckArrayBounds) {
228      GLuint max = max_buffer_index(ctx, count, type, indices,
229                                    ctx->Array.ElementArrayBufferObj);
230      if (max >= ctx->Array._MaxElement) {
231         /* the max element is out of bounds of one or more enabled arrays */
232         return GL_FALSE;
233      }
234   }
235
236   return GL_TRUE;
237}
238
239
240/**
241 * Called from the tnl module to error check the function parameters and
242 * verify that we really can draw something.
243 */
244GLboolean
245_mesa_validate_DrawArrays(GLcontext *ctx,
246			  GLenum mode, GLint start, GLsizei count)
247{
248   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
249
250   if (count < 0) {
251      _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
252      return GL_FALSE;
253   }
254
255   if (mode > GL_POLYGON) {
256      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
257      return GL_FALSE;
258   }
259
260   if (ctx->NewState)
261      _mesa_update_state(ctx);
262
263   /* Always need vertex positions */
264   if (!ctx->Array.ArrayObj->Vertex.Enabled
265       && !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
266      return GL_FALSE;
267
268   if (ctx->Const.CheckArrayBounds) {
269      if (start + count > (GLint) ctx->Array._MaxElement)
270         return GL_FALSE;
271   }
272
273   return GL_TRUE;
274}
275