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
.MapBufferRange(ctx
, 0, elementBuf
->Size
,
69 GL_MAP_READ_BIT
, 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
, 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
)
121 /* For OpenGL ES, only draw if we have vertex positions
123 if (!ctx
->Array
.ArrayObj
->VertexAttrib
[VERT_ATTRIB_POS
].Enabled
)
131 const struct gl_shader_program
*vsProg
=
132 ctx
->Shader
.CurrentVertexProgram
;
133 GLboolean haveVertexShader
= (vsProg
&& vsProg
->LinkStatus
);
134 GLboolean haveVertexProgram
= ctx
->VertexProgram
._Enabled
;
135 if (haveVertexShader
|| haveVertexProgram
) {
136 /* Draw regardless of whether or not we have any vertex arrays.
137 * (Ex: could draw a point using a constant vertex pos)
142 /* Draw if we have vertex positions (GL_VERTEX_ARRAY or generic
145 return (ctx
->Array
.ArrayObj
->VertexAttrib
[VERT_ATTRIB_POS
].Enabled
||
146 ctx
->Array
.ArrayObj
->VertexAttrib
[VERT_ATTRIB_GENERIC0
].Enabled
);
161 * Do bounds checking on array element indexes. Check that the vertices
162 * pointed to by the indices don't lie outside buffer object bounds.
163 * \return GL_TRUE if OK, GL_FALSE if any indexed vertex goes is out of bounds
166 check_index_bounds(struct gl_context
*ctx
, GLsizei count
, GLenum type
,
167 const GLvoid
*indices
, GLint basevertex
)
169 struct _mesa_prim prim
;
170 struct _mesa_index_buffer ib
;
173 /* Only the X Server needs to do this -- otherwise, accessing outside
174 * array/BO bounds allows application termination.
176 if (!ctx
->Const
.CheckArrayBounds
)
179 memset(&prim
, 0, sizeof(prim
));
182 memset(&ib
, 0, sizeof(ib
));
185 ib
.obj
= ctx
->Array
.ArrayObj
->ElementArrayBufferObj
;
187 vbo_get_minmax_index(ctx
, &prim
, &ib
, &min
, &max
);
189 if ((int)(min
+ basevertex
) < 0 ||
190 max
+ basevertex
> ctx
->Array
.ArrayObj
->_MaxElement
) {
191 /* the max element is out of bounds of one or more enabled arrays */
192 _mesa_warning(ctx
, "glDrawElements() index=%u is out of bounds (max=%u)",
193 max
, ctx
->Array
.ArrayObj
->_MaxElement
);
202 * Is 'mode' a valid value for glBegin(), glDrawArrays(), glDrawElements(),
203 * etc? The set of legal values depends on whether geometry shaders/programs
207 _mesa_valid_prim_mode(const struct gl_context
*ctx
, GLenum mode
)
209 if (ctx
->Extensions
.ARB_geometry_shader4
&&
210 mode
> GL_TRIANGLE_STRIP_ADJACENCY_ARB
) {
213 else if (mode
> GL_POLYGON
) {
223 * Error checking for glDrawElements(). Includes parameter checking
224 * and VBO bounds checking.
225 * \return GL_TRUE if OK to render, GL_FALSE if error found
228 _mesa_validate_DrawElements(struct gl_context
*ctx
,
229 GLenum mode
, 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
, "glDrawElements(count)" );
240 if (!_mesa_valid_prim_mode(ctx
, mode
)) {
241 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(mode)" );
245 if (type
!= GL_UNSIGNED_INT
&&
246 type
!= GL_UNSIGNED_BYTE
&&
247 type
!= GL_UNSIGNED_SHORT
)
249 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(type)" );
253 if (!check_valid_to_render(ctx
, "glDrawElements"))
256 /* Vertex buffer object tests */
257 if (_mesa_is_bufferobj(ctx
->Array
.ArrayObj
->ElementArrayBufferObj
)) {
258 /* use indices in the buffer object */
259 /* make sure count doesn't go outside buffer bounds */
260 if (index_bytes(type
, count
) > ctx
->Array
.ArrayObj
->ElementArrayBufferObj
->Size
) {
261 _mesa_warning(ctx
, "glDrawElements index out of buffer bounds");
266 /* not using a VBO */
271 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))
279 * Error checking for glDrawRangeElements(). Includes parameter checking
280 * and VBO bounds checking.
281 * \return GL_TRUE if OK to render, GL_FALSE if error found
284 _mesa_validate_DrawRangeElements(struct gl_context
*ctx
, GLenum mode
,
285 GLuint start
, GLuint end
,
286 GLsizei count
, GLenum type
,
287 const GLvoid
*indices
, GLint basevertex
)
289 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
293 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(count)" );
297 if (!_mesa_valid_prim_mode(ctx
, mode
)) {
298 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(mode)" );
303 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(end<start)");
307 if (type
!= GL_UNSIGNED_INT
&&
308 type
!= GL_UNSIGNED_BYTE
&&
309 type
!= GL_UNSIGNED_SHORT
) {
310 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(type)" );
314 if (!check_valid_to_render(ctx
, "glDrawRangeElements"))
317 /* Vertex buffer object tests */
318 if (_mesa_is_bufferobj(ctx
->Array
.ArrayObj
->ElementArrayBufferObj
)) {
319 /* use indices in the buffer object */
320 /* make sure count doesn't go outside buffer bounds */
321 if (index_bytes(type
, count
) > ctx
->Array
.ArrayObj
->ElementArrayBufferObj
->Size
) {
322 _mesa_warning(ctx
, "glDrawRangeElements index out of buffer bounds");
327 /* not using a VBO */
332 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))
340 * Called from the tnl module to error check the function parameters and
341 * verify that we really can draw something.
342 * \return GL_TRUE if OK to render, GL_FALSE if error found
345 _mesa_validate_DrawArrays(struct gl_context
*ctx
,
346 GLenum mode
, GLint start
, GLsizei count
)
348 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
352 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawArrays(count)" );
356 if (!_mesa_valid_prim_mode(ctx
, mode
)) {
357 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawArrays(mode)" );
361 if (!check_valid_to_render(ctx
, "glDrawArrays"))
364 if (ctx
->Const
.CheckArrayBounds
) {
365 if (start
+ count
> (GLint
) ctx
->Array
.ArrayObj
->_MaxElement
)
374 _mesa_validate_DrawArraysInstanced(struct gl_context
*ctx
, GLenum mode
, GLint first
,
375 GLsizei count
, GLsizei numInstances
)
377 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
381 _mesa_error(ctx
, GL_INVALID_VALUE
,
382 "glDrawArraysInstanced(count=%d)", count
);
386 if (!_mesa_valid_prim_mode(ctx
, mode
)) {
387 _mesa_error(ctx
, GL_INVALID_ENUM
,
388 "glDrawArraysInstanced(mode=0x%x)", mode
);
392 if (numInstances
<= 0) {
393 if (numInstances
< 0)
394 _mesa_error(ctx
, GL_INVALID_VALUE
,
395 "glDrawArraysInstanced(numInstances=%d)", numInstances
);
399 if (!check_valid_to_render(ctx
, "glDrawArraysInstanced(invalid to render)"))
402 if (ctx
->CompileFlag
) {
403 _mesa_error(ctx
, GL_INVALID_OPERATION
,
404 "glDrawArraysInstanced(display list");
408 if (ctx
->Const
.CheckArrayBounds
) {
409 if (first
+ count
> (GLint
) ctx
->Array
.ArrayObj
->_MaxElement
)
418 _mesa_validate_DrawElementsInstanced(struct gl_context
*ctx
,
419 GLenum mode
, GLsizei count
, GLenum type
,
420 const GLvoid
*indices
, GLsizei numInstances
,
423 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
427 _mesa_error(ctx
, GL_INVALID_VALUE
,
428 "glDrawElementsInstanced(count=%d)", count
);
432 if (!_mesa_valid_prim_mode(ctx
, mode
)) {
433 _mesa_error(ctx
, GL_INVALID_ENUM
,
434 "glDrawElementsInstanced(mode = 0x%x)", mode
);
438 if (type
!= GL_UNSIGNED_INT
&&
439 type
!= GL_UNSIGNED_BYTE
&&
440 type
!= GL_UNSIGNED_SHORT
) {
441 _mesa_error(ctx
, GL_INVALID_ENUM
,
442 "glDrawElementsInstanced(type=0x%x)", type
);
446 if (numInstances
<= 0) {
447 if (numInstances
< 0)
448 _mesa_error(ctx
, GL_INVALID_VALUE
,
449 "glDrawElementsInstanced(numInstances=%d)", numInstances
);
453 if (!check_valid_to_render(ctx
, "glDrawElementsInstanced"))
456 /* Vertex buffer object tests */
457 if (_mesa_is_bufferobj(ctx
->Array
.ArrayObj
->ElementArrayBufferObj
)) {
458 /* use indices in the buffer object */
459 /* make sure count doesn't go outside buffer bounds */
460 if (index_bytes(type
, count
) > ctx
->Array
.ArrayObj
->ElementArrayBufferObj
->Size
) {
462 "glDrawElementsInstanced index out of buffer bounds");
467 /* not using a VBO */
472 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))