api_validate.c revision ee34e6ef716bb630440299ac1efbc2055ef09ffd 
1/*
2 * Mesa 3-D graphics library
3 * Version:  6.1
4 *
5 * Copyright (C) 1999-2003  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->Data) {
73         _mesa_warning(ctx, "DrawElements with empty vertex elements buffer!");
74         return GL_FALSE;
75      }
76
77      /* make sure count doesn't go outside buffer bounds */
78      if (type == GL_UNSIGNED_INT) {
79         indexBytes = count * sizeof(GLuint);
80      }
81      else if (type == GL_UNSIGNED_BYTE) {
82         indexBytes = count * sizeof(GLubyte);
83      }
84      else {
85         ASSERT(type == GL_UNSIGNED_SHORT);
86         indexBytes = count * sizeof(GLushort);
87      }
88
89      if ((GLubyte *) indices + indexBytes >
90          ctx->Array.ElementArrayBufferObj->Data +
91          ctx->Array.ElementArrayBufferObj->Size) {
92         _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
93         return GL_FALSE;
94      }
95
96      /* Actual address is the sum of pointers.  Indices may be used below. */
97      if (ctx->Const.CheckArrayBounds) {
98         indices = (const GLvoid *)
99            ADD_POINTERS(ctx->Array.ElementArrayBufferObj->Data,
100                         (const GLubyte *) indices);
101      }
102   }
103
104   if (ctx->Const.CheckArrayBounds) {
105      /* find max array index */
106      GLuint max = 0;
107      GLint i;
108      if (type == GL_UNSIGNED_INT) {
109         for (i = 0; i < count; i++)
110            if (((GLuint *) indices)[i] > max)
111               max = ((GLuint *) indices)[i];
112      }
113      else if (type == GL_UNSIGNED_SHORT) {
114         for (i = 0; i < count; i++)
115            if (((GLushort *) indices)[i] > max)
116               max = ((GLushort *) indices)[i];
117      }
118      else {
119         ASSERT(type == GL_UNSIGNED_BYTE);
120         for (i = 0; i < count; i++)
121            if (((GLubyte *) indices)[i] > max)
122               max = ((GLubyte *) indices)[i];
123      }
124      if (max >= ctx->Array._MaxElement) {
125         /* the max element is out of bounds of one or more enabled arrays */
126         return GL_FALSE;
127      }
128   }
129
130   return GL_TRUE;
131}
132
133
134GLboolean
135_mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
136				 GLuint start, GLuint end,
137				 GLsizei count, GLenum type,
138				 const GLvoid *indices)
139{
140   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
141
142   if (count <= 0) {
143      if (count < 0)
144	 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
145      return GL_FALSE;
146   }
147
148   if (mode > GL_POLYGON) {
149      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
150      return GL_FALSE;
151   }
152
153   if (end < start) {
154      _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
155      return GL_FALSE;
156   }
157
158   if (type != GL_UNSIGNED_INT &&
159       type != GL_UNSIGNED_BYTE &&
160       type != GL_UNSIGNED_SHORT) {
161      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
162      return GL_FALSE;
163   }
164
165   if (ctx->NewState)
166      _mesa_update_state(ctx);
167
168   /* Always need vertex positions */
169   if (!ctx->Array.ArrayObj->Vertex.Enabled
170       && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
171      return GL_FALSE;
172
173   if (ctx->Const.CheckArrayBounds) {
174      /* Find max array index.
175       * We don't trust the user's start and end values.
176       */
177      GLuint max = 0;
178      GLint i;
179      if (type == GL_UNSIGNED_INT) {
180         for (i = 0; i < count; i++)
181            if (((GLuint *) indices)[i] > max)
182               max = ((GLuint *) indices)[i];
183      }
184      else if (type == GL_UNSIGNED_SHORT) {
185         for (i = 0; i < count; i++)
186            if (((GLushort *) indices)[i] > max)
187               max = ((GLushort *) indices)[i];
188      }
189      else {
190         ASSERT(type == GL_UNSIGNED_BYTE);
191         for (i = 0; i < count; i++)
192            if (((GLubyte *) indices)[i] > max)
193               max = ((GLubyte *) indices)[i];
194      }
195      if (max >= ctx->Array._MaxElement) {
196         /* the max element is out of bounds of one or more enabled arrays */
197         return GL_FALSE;
198      }
199   }
200
201   return GL_TRUE;
202}
203
204
205/**
206 * Called from the tnl module to error check the function parameters and
207 * verify that we really can draw something.
208 */
209GLboolean
210_mesa_validate_DrawArrays(GLcontext *ctx,
211			  GLenum mode, GLint start, GLsizei count)
212{
213   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
214
215   if (count < 0) {
216      _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
217      return GL_FALSE;
218   }
219
220   if (mode > GL_POLYGON) {
221      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
222      return GL_FALSE;
223   }
224
225   if (ctx->NewState)
226      _mesa_update_state(ctx);
227
228   /* Always need vertex positions */
229   if (!ctx->Array.ArrayObj->Vertex.Enabled && !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
230      return GL_FALSE;
231
232   if (ctx->Const.CheckArrayBounds) {
233      if (start + count > (GLint) ctx->Array._MaxElement)
234         return GL_FALSE;
235   }
236
237   return GL_TRUE;
238}
239