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"
35 * \return number of bytes in array [count] of type.
38 index_bytes(GLenum type
, GLsizei count
)
40 if (type
== GL_UNSIGNED_INT
) {
41 return count
* sizeof(GLuint
);
43 else if (type
== GL_UNSIGNED_BYTE
) {
44 return count
* sizeof(GLubyte
);
47 ASSERT(type
== GL_UNSIGNED_SHORT
);
48 return count
* sizeof(GLushort
);
54 * Find the max index in the given element/index buffer
57 _mesa_max_buffer_index(GLcontext
*ctx
, GLuint count
, GLenum type
,
59 struct gl_buffer_object
*elementBuf
)
61 const GLubyte
*map
= NULL
;
65 if (_mesa_is_bufferobj(elementBuf
)) {
66 /* elements are in a user-defined buffer object. need to map it */
67 map
= ctx
->Driver
.MapBuffer(ctx
, GL_ELEMENT_ARRAY_BUFFER
,
68 GL_READ_ONLY
, elementBuf
);
69 /* Actual address is the sum of pointers */
70 indices
= (const GLvoid
*) ADD_POINTERS(map
, (const GLubyte
*) indices
);
73 if (type
== GL_UNSIGNED_INT
) {
74 for (i
= 0; i
< count
; i
++)
75 if (((GLuint
*) indices
)[i
] > max
)
76 max
= ((GLuint
*) indices
)[i
];
78 else if (type
== GL_UNSIGNED_SHORT
) {
79 for (i
= 0; i
< count
; i
++)
80 if (((GLushort
*) indices
)[i
] > max
)
81 max
= ((GLushort
*) indices
)[i
];
84 ASSERT(type
== GL_UNSIGNED_BYTE
);
85 for (i
= 0; i
< count
; i
++)
86 if (((GLubyte
*) indices
)[i
] > max
)
87 max
= ((GLubyte
*) indices
)[i
];
91 ctx
->Driver
.UnmapBuffer(ctx
, GL_ELEMENT_ARRAY_BUFFER_ARB
, elementBuf
);
99 * Check if OK to draw arrays/elements.
102 check_valid_to_render(GLcontext
*ctx
, const char *function
)
104 if (!_mesa_valid_to_render(ctx
, function
)) {
109 /* For ES2, we can draw if any vertex array is enabled (and we should
110 * always have a vertex program/shader).
112 if (ctx
->Array
.ArrayObj
->_Enabled
== 0x0 || !ctx
->VertexProgram
._Current
)
115 /* For regular OpenGL, only draw if we have vertex positions (regardless
116 * of whether or not we have a vertex program/shader).
118 if (!ctx
->Array
.ArrayObj
->Vertex
.Enabled
&&
119 !ctx
->Array
.ArrayObj
->VertexAttrib
[0].Enabled
)
127 check_index_bounds(GLcontext
*ctx
, GLsizei count
, GLenum type
,
128 const GLvoid
*indices
, GLint basevertex
)
130 struct _mesa_prim prim
;
131 struct _mesa_index_buffer ib
;
134 /* Only the X Server needs to do this -- otherwise, accessing outside
135 * array/BO bounds allows application termination.
137 if (!ctx
->Const
.CheckArrayBounds
)
140 memset(&prim
, 0, sizeof(prim
));
143 memset(&ib
, 0, sizeof(ib
));
146 ib
.obj
= ctx
->Array
.ElementArrayBufferObj
;
148 vbo_get_minmax_index(ctx
, &prim
, &ib
, &min
, &max
);
150 if ((int)(min
+ basevertex
) < 0 ||
151 max
+ basevertex
> ctx
->Array
.ArrayObj
->_MaxElement
) {
152 /* the max element is out of bounds of one or more enabled arrays */
153 _mesa_warning(ctx
, "glDrawElements() index=%u is "
154 "out of bounds (max=%u)", max
, ctx
->Array
.ArrayObj
->_MaxElement
);
162 * Error checking for glDrawElements(). Includes parameter checking
163 * and VBO bounds checking.
164 * \return GL_TRUE if OK to render, GL_FALSE if error found
167 _mesa_validate_DrawElements(GLcontext
*ctx
,
168 GLenum mode
, GLsizei count
, GLenum type
,
169 const GLvoid
*indices
, GLint basevertex
)
171 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
175 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawElements(count)" );
179 if (mode
> GL_POLYGON
) {
180 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(mode)" );
184 if (type
!= GL_UNSIGNED_INT
&&
185 type
!= GL_UNSIGNED_BYTE
&&
186 type
!= GL_UNSIGNED_SHORT
)
188 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(type)" );
192 if (!check_valid_to_render(ctx
, "glDrawElements"))
195 /* Vertex buffer object tests */
196 if (_mesa_is_bufferobj(ctx
->Array
.ElementArrayBufferObj
)) {
197 /* use indices in the buffer object */
198 /* make sure count doesn't go outside buffer bounds */
199 if (index_bytes(type
, count
) > ctx
->Array
.ElementArrayBufferObj
->Size
) {
200 _mesa_warning(ctx
, "glDrawElements index out of buffer bounds");
205 /* not using a VBO */
210 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))
218 * Error checking for glDrawRangeElements(). Includes parameter checking
219 * and VBO bounds checking.
220 * \return GL_TRUE if OK to render, GL_FALSE if error found
223 _mesa_validate_DrawRangeElements(GLcontext
*ctx
, GLenum mode
,
224 GLuint start
, GLuint end
,
225 GLsizei count
, GLenum type
,
226 const GLvoid
*indices
, GLint basevertex
)
228 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
232 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(count)" );
236 if (mode
> GL_POLYGON
) {
237 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(mode)" );
242 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(end<start)");
246 if (type
!= GL_UNSIGNED_INT
&&
247 type
!= GL_UNSIGNED_BYTE
&&
248 type
!= GL_UNSIGNED_SHORT
) {
249 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(type)" );
253 if (!check_valid_to_render(ctx
, "glDrawRangeElements"))
256 /* Vertex buffer object tests */
257 if (_mesa_is_bufferobj(ctx
->Array
.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
.ElementArrayBufferObj
->Size
) {
261 _mesa_warning(ctx
, "glDrawRangeElements index out of buffer bounds");
266 /* not using a VBO */
271 if (!check_index_bounds(ctx
, count
, type
, indices
, basevertex
))
279 * Called from the tnl module to error check the function parameters and
280 * verify that we really can draw something.
281 * \return GL_TRUE if OK to render, GL_FALSE if error found
284 _mesa_validate_DrawArrays(GLcontext
*ctx
,
285 GLenum mode
, GLint start
, GLsizei count
)
287 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
291 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawArrays(count)" );
295 if (mode
> GL_POLYGON
) {
296 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawArrays(mode)" );
300 if (!check_valid_to_render(ctx
, "glDrawArrays"))
303 if (ctx
->Const
.CheckArrayBounds
) {
304 if (start
+ count
> (GLint
) ctx
->Array
.ArrayObj
->_MaxElement
)