2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
26 #include "api_validate.h"
27 #include "bufferobj.h"
36 * \return number of bytes in array [count] of type.
39 index_bytes(GLenum type
, GLsizei count
)
41 if (type
== GL_UNSIGNED_INT
) {
42 return count
* sizeof(GLuint
);
44 else if (type
== GL_UNSIGNED_BYTE
) {
45 return count
* sizeof(GLubyte
);
48 ASSERT(type
== GL_UNSIGNED_SHORT
);
49 return count
* sizeof(GLushort
);
55 * Find the max index in the given element/index buffer
58 _mesa_max_buffer_index(GLcontext
*ctx
, GLuint count
, GLenum type
,
60 struct gl_buffer_object
*elementBuf
)
62 const GLubyte
*map
= NULL
;
66 if (_mesa_is_bufferobj(elementBuf
)) {
67 /* elements are in a user-defined buffer object. need to map it */
68 map
= ctx
->Driver
.MapBuffer(ctx
, GL_ELEMENT_ARRAY_BUFFER
,
69 GL_READ_ONLY
, elementBuf
);
70 /* Actual address is the sum of pointers */
71 indices
= (const GLvoid
*) ADD_POINTERS(map
, (const GLubyte
*) indices
);
74 if (type
== GL_UNSIGNED_INT
) {
75 for (i
= 0; i
< count
; i
++)
76 if (((GLuint
*) indices
)[i
] > max
)
77 max
= ((GLuint
*) indices
)[i
];
79 else if (type
== GL_UNSIGNED_SHORT
) {
80 for (i
= 0; i
< count
; i
++)
81 if (((GLushort
*) indices
)[i
] > max
)
82 max
= ((GLushort
*) indices
)[i
];
85 ASSERT(type
== GL_UNSIGNED_BYTE
);
86 for (i
= 0; i
< count
; i
++)
87 if (((GLubyte
*) indices
)[i
] > max
)
88 max
= ((GLubyte
*) indices
)[i
];
92 ctx
->Driver
.UnmapBuffer(ctx
, GL_ELEMENT_ARRAY_BUFFER_ARB
, elementBuf
);
100 * Check if OK to draw arrays/elements.
103 check_valid_to_render(GLcontext
*ctx
, const char *function
)
105 if (!_mesa_valid_to_render(ctx
, function
)) {
110 /* For ES2, we can draw if any vertex array is enabled (and we should
111 * always have a vertex program/shader).
113 if (ctx
->Array
.ArrayObj
->_Enabled
== 0x0 || !ctx
->VertexProgram
._Current
)
116 /* For regular OpenGL, only draw if we have vertex positions (regardless
117 * of whether or not we have a vertex program/shader).
119 if (!ctx
->Array
.ArrayObj
->Vertex
.Enabled
&&
120 !ctx
->Array
.ArrayObj
->VertexAttrib
[0].Enabled
)
128 check_index_bounds(GLcontext
*ctx
, GLsizei count
, GLenum type
,
129 const GLvoid
*indices
, GLint basevertex
)
131 struct _mesa_prim prim
;
132 struct _mesa_index_buffer ib
;
135 /* Only the X Server needs to do this -- otherwise, accessing outside
136 * array/BO bounds allows application termination.
138 if (!ctx
->Const
.CheckArrayBounds
)
141 memset(&prim
, 0, sizeof(prim
));
144 memset(&ib
, 0, sizeof(ib
));
147 ib
.obj
= ctx
->Array
.ElementArrayBufferObj
;
149 vbo_get_minmax_index(ctx
, &prim
, &ib
, &min
, &max
);
151 if (min
+ basevertex
< 0 ||
152 max
+ basevertex
> ctx
->Array
.ArrayObj
->_MaxElement
) {
153 /* the max element is out of bounds of one or more enabled arrays */
154 _mesa_warning(ctx
, "glDrawElements() index=%u is "
155 "out of bounds (max=%u)", max
, ctx
->Array
.ArrayObj
->_MaxElement
);
163 * Error checking for glDrawElements(). Includes parameter checking
164 * and VBO bounds checking.
165 * \return GL_TRUE if OK to render, GL_FALSE if error found
168 _mesa_validate_DrawElements(GLcontext
*ctx
,
169 GLenum mode
, GLsizei count
, GLenum type
,
170 const GLvoid
*indices
, GLint basevertex
)
172 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
176 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawElements(count)" );
180 if (mode
> GL_POLYGON
) {
181 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(mode)" );
185 if (type
!= GL_UNSIGNED_INT
&&
186 type
!= GL_UNSIGNED_BYTE
&&
187 type
!= GL_UNSIGNED_SHORT
)
189 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(type)" );
194 _mesa_update_state(ctx
);
196 if (!check_valid_to_render(ctx
, "glDrawElements"))
199 /* Vertex buffer object tests */
200 if (_mesa_is_bufferobj(ctx
->Array
.ElementArrayBufferObj
)) {
201 /* use indices in the buffer object */
202 /* make sure count doesn't go outside buffer bounds */
203 if (index_bytes(type
, count
) > ctx
->Array
.ElementArrayBufferObj
->Size
) {
204 _mesa_warning(ctx
, "glDrawElements index out of buffer bounds");
209 /* not using a VBO */
214 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))
222 * Error checking for glDrawRangeElements(). Includes parameter checking
223 * and VBO bounds checking.
224 * \return GL_TRUE if OK to render, GL_FALSE if error found
227 _mesa_validate_DrawRangeElements(GLcontext
*ctx
, GLenum mode
,
228 GLuint start
, GLuint end
,
229 GLsizei count
, GLenum type
,
230 const GLvoid
*indices
, GLint basevertex
)
232 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
236 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(count)" );
240 if (mode
> GL_POLYGON
) {
241 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(mode)" );
246 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(end<start)");
250 if (type
!= GL_UNSIGNED_INT
&&
251 type
!= GL_UNSIGNED_BYTE
&&
252 type
!= GL_UNSIGNED_SHORT
) {
253 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(type)" );
258 _mesa_update_state(ctx
);
260 if (!check_valid_to_render(ctx
, "glDrawRangeElements"))
263 /* Vertex buffer object tests */
264 if (_mesa_is_bufferobj(ctx
->Array
.ElementArrayBufferObj
)) {
265 /* use indices in the buffer object */
266 /* make sure count doesn't go outside buffer bounds */
267 if (index_bytes(type
, count
) > ctx
->Array
.ElementArrayBufferObj
->Size
) {
268 _mesa_warning(ctx
, "glDrawRangeElements index out of buffer bounds");
273 /* not using a VBO */
278 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))
286 * Called from the tnl module to error check the function parameters and
287 * verify that we really can draw something.
288 * \return GL_TRUE if OK to render, GL_FALSE if error found
291 _mesa_validate_DrawArrays(GLcontext
*ctx
,
292 GLenum mode
, GLint start
, GLsizei count
)
294 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
298 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawArrays(count)" );
302 if (mode
> GL_POLYGON
) {
303 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawArrays(mode)" );
308 _mesa_update_state(ctx
);
310 if (!check_valid_to_render(ctx
, "glDrawArrays"))
313 if (ctx
->Const
.CheckArrayBounds
) {
314 if (start
+ count
> (GLint
) ctx
->Array
.ArrayObj
->_MaxElement
)