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"
30 #include "mfeatures.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(struct gl_context
*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(struct gl_context
*ctx
, const char *function
)
105 if (!_mesa_valid_to_render(ctx
, function
)) {
112 /* For ES2, we can draw if any vertex array is enabled (and we
113 * should always have a vertex program/shader). */
114 if (ctx
->Array
.ArrayObj
->_Enabled
== 0x0 || !ctx
->VertexProgram
._Current
)
119 #if FEATURE_ES1 || FEATURE_GL
122 /* For regular OpenGL, only draw if we have vertex positions
123 * (regardless of whether or not we have a vertex program/shader). */
124 if (!ctx
->Array
.ArrayObj
->Vertex
.Enabled
&&
125 !ctx
->Array
.ArrayObj
->VertexAttrib
[0].Enabled
)
139 * Do bounds checking on array element indexes. Check that the vertices
140 * pointed to by the indices don't lie outside buffer object bounds.
141 * \return GL_TRUE if OK, GL_FALSE if any indexed vertex goes is out of bounds
144 check_index_bounds(struct gl_context
*ctx
, GLsizei count
, GLenum type
,
145 const GLvoid
*indices
, GLint basevertex
)
147 struct _mesa_prim prim
;
148 struct _mesa_index_buffer ib
;
151 /* Only the X Server needs to do this -- otherwise, accessing outside
152 * array/BO bounds allows application termination.
154 if (!ctx
->Const
.CheckArrayBounds
)
157 memset(&prim
, 0, sizeof(prim
));
160 memset(&ib
, 0, sizeof(ib
));
163 ib
.obj
= ctx
->Array
.ElementArrayBufferObj
;
165 vbo_get_minmax_index(ctx
, &prim
, &ib
, &min
, &max
);
167 if ((int)(min
+ basevertex
) < 0 ||
168 max
+ basevertex
> ctx
->Array
.ArrayObj
->_MaxElement
) {
169 /* the max element is out of bounds of one or more enabled arrays */
170 _mesa_warning(ctx
, "glDrawElements() index=%u is out of bounds (max=%u)",
171 max
, ctx
->Array
.ArrayObj
->_MaxElement
);
180 * Error checking for glDrawElements(). Includes parameter checking
181 * and VBO bounds checking.
182 * \return GL_TRUE if OK to render, GL_FALSE if error found
185 _mesa_validate_DrawElements(struct gl_context
*ctx
,
186 GLenum mode
, GLsizei count
, GLenum type
,
187 const GLvoid
*indices
, GLint basevertex
)
189 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
193 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawElements(count)" );
197 if (mode
> GL_TRIANGLE_STRIP_ADJACENCY_ARB
) {
198 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(mode)" );
202 if (type
!= GL_UNSIGNED_INT
&&
203 type
!= GL_UNSIGNED_BYTE
&&
204 type
!= GL_UNSIGNED_SHORT
)
206 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(type)" );
210 if (!check_valid_to_render(ctx
, "glDrawElements"))
213 /* Vertex buffer object tests */
214 if (_mesa_is_bufferobj(ctx
->Array
.ElementArrayBufferObj
)) {
215 /* use indices in the buffer object */
216 /* make sure count doesn't go outside buffer bounds */
217 if (index_bytes(type
, count
) > ctx
->Array
.ElementArrayBufferObj
->Size
) {
218 _mesa_warning(ctx
, "glDrawElements index out of buffer bounds");
223 /* not using a VBO */
228 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))
236 * Error checking for glDrawRangeElements(). Includes parameter checking
237 * and VBO bounds checking.
238 * \return GL_TRUE if OK to render, GL_FALSE if error found
241 _mesa_validate_DrawRangeElements(struct gl_context
*ctx
, GLenum mode
,
242 GLuint start
, GLuint end
,
243 GLsizei count
, GLenum type
,
244 const GLvoid
*indices
, GLint basevertex
)
246 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
250 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(count)" );
254 if (mode
> GL_TRIANGLE_STRIP_ADJACENCY_ARB
) {
255 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(mode)" );
260 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(end<start)");
264 if (type
!= GL_UNSIGNED_INT
&&
265 type
!= GL_UNSIGNED_BYTE
&&
266 type
!= GL_UNSIGNED_SHORT
) {
267 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(type)" );
271 if (!check_valid_to_render(ctx
, "glDrawRangeElements"))
274 /* Vertex buffer object tests */
275 if (_mesa_is_bufferobj(ctx
->Array
.ElementArrayBufferObj
)) {
276 /* use indices in the buffer object */
277 /* make sure count doesn't go outside buffer bounds */
278 if (index_bytes(type
, count
) > ctx
->Array
.ElementArrayBufferObj
->Size
) {
279 _mesa_warning(ctx
, "glDrawRangeElements index out of buffer bounds");
284 /* not using a VBO */
289 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))
297 * Called from the tnl module to error check the function parameters and
298 * verify that we really can draw something.
299 * \return GL_TRUE if OK to render, GL_FALSE if error found
302 _mesa_validate_DrawArrays(struct gl_context
*ctx
,
303 GLenum mode
, GLint start
, GLsizei count
)
305 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
309 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawArrays(count)" );
313 if (mode
> GL_TRIANGLE_STRIP_ADJACENCY_ARB
) {
314 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawArrays(mode)" );
318 if (!check_valid_to_render(ctx
, "glDrawArrays"))
321 if (ctx
->Const
.CheckArrayBounds
) {
322 if (start
+ count
> (GLint
) ctx
->Array
.ArrayObj
->_MaxElement
)
331 _mesa_validate_DrawArraysInstanced(struct gl_context
*ctx
, GLenum mode
, GLint first
,
332 GLsizei count
, GLsizei primcount
)
334 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
338 _mesa_error(ctx
, GL_INVALID_VALUE
,
339 "glDrawArraysInstanced(count=%d)", count
);
343 if (mode
> GL_TRIANGLE_STRIP_ADJACENCY_ARB
) {
344 _mesa_error(ctx
, GL_INVALID_ENUM
,
345 "glDrawArraysInstanced(mode=0x%x)", mode
);
349 if (primcount
<= 0) {
351 _mesa_error(ctx
, GL_INVALID_VALUE
,
352 "glDrawArraysInstanced(primcount=%d)", primcount
);
356 if (!check_valid_to_render(ctx
, "glDrawArraysInstanced(invalid to render)"))
359 if (ctx
->CompileFlag
) {
360 _mesa_error(ctx
, GL_INVALID_OPERATION
,
361 "glDrawArraysInstanced(display list");
365 if (ctx
->Const
.CheckArrayBounds
) {
366 if (first
+ count
> (GLint
) ctx
->Array
.ArrayObj
->_MaxElement
)
375 _mesa_validate_DrawElementsInstanced(struct gl_context
*ctx
,
376 GLenum mode
, GLsizei count
, GLenum type
,
377 const GLvoid
*indices
, GLsizei primcount
)
379 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
383 _mesa_error(ctx
, GL_INVALID_VALUE
,
384 "glDrawElementsInstanced(count=%d)", count
);
388 if (mode
> GL_TRIANGLE_STRIP_ADJACENCY_ARB
) {
389 _mesa_error(ctx
, GL_INVALID_ENUM
,
390 "glDrawElementsInstanced(mode = 0x%x)", mode
);
394 if (type
!= GL_UNSIGNED_INT
&&
395 type
!= GL_UNSIGNED_BYTE
&&
396 type
!= GL_UNSIGNED_SHORT
) {
397 _mesa_error(ctx
, GL_INVALID_ENUM
,
398 "glDrawElementsInstanced(type=0x%x)", type
);
402 if (primcount
<= 0) {
404 _mesa_error(ctx
, GL_INVALID_VALUE
,
405 "glDrawElementsInstanced(primcount=%d)", primcount
);
409 if (!check_valid_to_render(ctx
, "glDrawElementsInstanced"))
412 /* Vertex buffer object tests */
413 if (_mesa_is_bufferobj(ctx
->Array
.ElementArrayBufferObj
)) {
414 /* use indices in the buffer object */
415 /* make sure count doesn't go outside buffer bounds */
416 if (index_bytes(type
, count
) > ctx
->Array
.ElementArrayBufferObj
->Size
) {
418 "glDrawElementsInstanced index out of buffer bounds");
423 /* not using a VBO */
428 if (!check_index_bounds(ctx
, count
, type
, indices
, 0))