api_validate.c revision a3c3bc9ece7e7c55c8832dbc8c50ab1c34f5bfe9 
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
33GLboolean
34_mesa_validate_DrawElements(GLcontext *ctx,
35			    GLenum mode, GLsizei count, GLenum type,
36			    const GLvoid *indices)
37{
38   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx,  GL_FALSE);
39
40   if (count <= 0) {
41      if (count < 0)
42	 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" );
43      return GL_FALSE;
44   }
45
46   if (mode > GL_POLYGON) {
47      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" );
48      return GL_FALSE;
49   }
50
51   if (type != GL_UNSIGNED_INT &&
52       type != GL_UNSIGNED_BYTE &&
53       type != GL_UNSIGNED_SHORT)
54   {
55      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" );
56      return GL_FALSE;
57   }
58
59   if (ctx->NewState)
60      _mesa_update_state(ctx);
61
62   /* Always need vertex positions */
63   if (!ctx->Array.ArrayObj->Vertex.Enabled
64       && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
65      return GL_FALSE;
66
67   /* Vertex buffer object tests */
68   if (ctx->Array.ElementArrayBufferObj->Name) {
69      GLuint indexBytes;
70
71      /* use indices in the buffer object */
72      if (!ctx->Array.ElementArrayBufferObj->Size) {
73         _mesa_warning(ctx,
74                       "glDrawElements called with empty array elements buffer");
75         return GL_FALSE;
76      }
77
78      /* make sure count doesn't go outside buffer bounds */
79      if (type == GL_UNSIGNED_INT) {
80         indexBytes = count * sizeof(GLuint);
81      }
82      else if (type == GL_UNSIGNED_BYTE) {
83         indexBytes = count * sizeof(GLubyte);
84      }
85      else {
86         ASSERT(type == GL_UNSIGNED_SHORT);
87         indexBytes = count * sizeof(GLushort);
88      }
89
90      if (indexBytes > ctx->Array.ElementArrayBufferObj->Size) {
91         _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
92         return GL_FALSE;
93      }
94   }
95   else {
96      /* not using a VBO */
97      if (!indices)
98         return GL_FALSE;
99   }
100
101   if (ctx->Const.CheckArrayBounds) {
102      /* find max array index */
103      const GLubyte *map;
104      GLuint max = 0;
105      GLint i;
106
107      map = ctx->Driver.MapBuffer(ctx,
108                                  GL_ELEMENT_ARRAY_BUFFER_ARB,
109                                  GL_READ_ONLY,
110                                  ctx->Array.ElementArrayBufferObj);
111
112      /* Actual address is the sum of pointers */
113      indices = (const GLvoid *) ADD_POINTERS(map, (const GLubyte *) indices);
114
115      if (type == GL_UNSIGNED_INT) {
116         for (i = 0; i < count; i++)
117            if (((GLuint *) indices)[i] > max)
118               max = ((GLuint *) indices)[i];
119      }
120      else if (type == GL_UNSIGNED_SHORT) {
121         for (i = 0; i < count; i++)
122            if (((GLushort *) indices)[i] > max)
123               max = ((GLushort *) indices)[i];
124      }
125      else {
126         ASSERT(type == GL_UNSIGNED_BYTE);
127         for (i = 0; i < count; i++)
128            if (((GLubyte *) indices)[i] > max)
129               max = ((GLubyte *) indices)[i];
130      }
131
132      ctx->Driver.UnmapBuffer(ctx,
133                              GL_ELEMENT_ARRAY_BUFFER_ARB,
134                              ctx->Array.ElementArrayBufferObj);
135
136      if (max >= ctx->Array._MaxElement) {
137         /* the max element is out of bounds of one or more enabled arrays */
138         return GL_FALSE;
139      }
140   }
141
142   return GL_TRUE;
143}
144
145
146GLboolean
147_mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
148				 GLuint start, GLuint end,
149				 GLsizei count, GLenum type,
150				 const GLvoid *indices)
151{
152   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
153
154   if (count <= 0) {
155      if (count < 0)
156	 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
157      return GL_FALSE;
158   }
159
160   if (mode > GL_POLYGON) {
161      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
162      return GL_FALSE;
163   }
164
165   if (end < start) {
166      _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
167      return GL_FALSE;
168   }
169
170   if (type != GL_UNSIGNED_INT &&
171       type != GL_UNSIGNED_BYTE &&
172       type != GL_UNSIGNED_SHORT) {
173      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
174      return GL_FALSE;
175   }
176
177   if (ctx->NewState)
178      _mesa_update_state(ctx);
179
180   /* Always need vertex positions */
181   if (!ctx->Array.ArrayObj->Vertex.Enabled
182       && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
183      return GL_FALSE;
184
185   /* Vertex buffer object tests */
186   if (ctx->Array.ElementArrayBufferObj->Name) {
187      /* XXX re-use code from above? */
188   }
189   else {
190      /* not using VBO */
191      if (!indices)
192         return GL_FALSE;
193   }
194
195   if (ctx->Const.CheckArrayBounds) {
196      /* Find max array index.
197       * We don't trust the user's start and end values.
198       */
199      GLuint max = 0;
200      GLint i;
201      if (type == GL_UNSIGNED_INT) {
202         for (i = 0; i < count; i++)
203            if (((GLuint *) indices)[i] > max)
204               max = ((GLuint *) indices)[i];
205      }
206      else if (type == GL_UNSIGNED_SHORT) {
207         for (i = 0; i < count; i++)
208            if (((GLushort *) indices)[i] > max)
209               max = ((GLushort *) indices)[i];
210      }
211      else {
212         ASSERT(type == GL_UNSIGNED_BYTE);
213         for (i = 0; i < count; i++)
214            if (((GLubyte *) indices)[i] > max)
215               max = ((GLubyte *) indices)[i];
216      }
217      if (max >= ctx->Array._MaxElement) {
218         /* the max element is out of bounds of one or more enabled arrays */
219         return GL_FALSE;
220      }
221   }
222
223   return GL_TRUE;
224}
225
226
227/**
228 * Called from the tnl module to error check the function parameters and
229 * verify that we really can draw something.
230 */
231GLboolean
232_mesa_validate_DrawArrays(GLcontext *ctx,
233			  GLenum mode, GLint start, GLsizei count)
234{
235   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
236
237   if (count < 0) {
238      _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
239      return GL_FALSE;
240   }
241
242   if (mode > GL_POLYGON) {
243      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
244      return GL_FALSE;
245   }
246
247   if (ctx->NewState)
248      _mesa_update_state(ctx);
249
250   /* Always need vertex positions */
251   if (!ctx->Array.ArrayObj->Vertex.Enabled && !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
252      return GL_FALSE;
253
254   if (ctx->Const.CheckArrayBounds) {
255      if (start + count > (GLint) ctx->Array._MaxElement)
256         return GL_FALSE;
257   }
258
259   return GL_TRUE;
260}
261