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"
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 max_buffer_index(GLcontext
*ctx
, GLuint count
, GLenum type
,
59 struct gl_buffer_object
*elementBuf
)
61 const GLubyte
*map
= NULL
;
65 if (elementBuf
->Name
) {
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 render by examining framebuffer status and vertex arrays.
102 check_valid_to_render(GLcontext
*ctx
, char *function
)
104 if (ctx
->DrawBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
105 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
106 "glDraw%s(incomplete framebuffer)", function
);
111 /* For ES2, we can draw if any vertex array is enabled (and we should
112 * always have a vertex program/shader).
114 if (ctx
->Array
.ArrayObj
->_Enabled
== 0x0 || !ctx
->VertexProgram
._Current
)
117 /* For regular OpenGL, only draw if we have vertex positions (regardless
118 * of whether or not we have a vertex program/shader).
120 if (!ctx
->Array
.ArrayObj
->Vertex
.Enabled
&&
121 !ctx
->Array
.ArrayObj
->VertexAttrib
[0].Enabled
)
130 * Error checking for glDrawElements(). Includes parameter checking
131 * and VBO bounds checking.
132 * \return GL_TRUE if OK to render, GL_FALSE if error found
135 _mesa_validate_DrawElements(GLcontext
*ctx
,
136 GLenum mode
, GLsizei count
, GLenum type
,
137 const GLvoid
*indices
)
139 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
143 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawElements(count)" );
147 if (mode
> GL_POLYGON
) {
148 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(mode)" );
152 if (type
!= GL_UNSIGNED_INT
&&
153 type
!= GL_UNSIGNED_BYTE
&&
154 type
!= GL_UNSIGNED_SHORT
)
156 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawElements(type)" );
161 _mesa_update_state(ctx
);
163 if (!check_valid_to_render(ctx
, "Elements"))
166 /* Vertex buffer object tests */
167 if (ctx
->Array
.ElementArrayBufferObj
->Name
) {
168 /* use indices in the buffer object */
169 /* make sure count doesn't go outside buffer bounds */
170 if (index_bytes(type
, count
) > ctx
->Array
.ElementArrayBufferObj
->Size
) {
171 _mesa_warning(ctx
, "glDrawElements index out of buffer bounds");
176 /* not using a VBO */
181 if (ctx
->Const
.CheckArrayBounds
) {
182 /* find max array index */
183 GLuint max
= max_buffer_index(ctx
, count
, type
, indices
,
184 ctx
->Array
.ElementArrayBufferObj
);
185 if (max
>= ctx
->Array
._MaxElement
) {
186 /* the max element is out of bounds of one or more enabled arrays */
196 * Error checking for glDrawRangeElements(). Includes parameter checking
197 * and VBO bounds checking.
198 * \return GL_TRUE if OK to render, GL_FALSE if error found
201 _mesa_validate_DrawRangeElements(GLcontext
*ctx
, GLenum mode
,
202 GLuint start
, GLuint end
,
203 GLsizei count
, GLenum type
,
204 const GLvoid
*indices
)
206 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
210 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(count)" );
214 if (mode
> GL_POLYGON
) {
215 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(mode)" );
220 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawRangeElements(end<start)");
224 if (type
!= GL_UNSIGNED_INT
&&
225 type
!= GL_UNSIGNED_BYTE
&&
226 type
!= GL_UNSIGNED_SHORT
) {
227 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawRangeElements(type)" );
232 _mesa_update_state(ctx
);
234 if (!check_valid_to_render(ctx
, "RangeElements"))
237 /* Vertex buffer object tests */
238 if (ctx
->Array
.ElementArrayBufferObj
->Name
) {
239 /* use indices in the buffer object */
240 /* make sure count doesn't go outside buffer bounds */
241 if (index_bytes(type
, count
) > ctx
->Array
.ElementArrayBufferObj
->Size
) {
242 _mesa_warning(ctx
, "glDrawRangeElements index out of buffer bounds");
247 /* not using a VBO */
252 if (ctx
->Const
.CheckArrayBounds
) {
253 GLuint max
= max_buffer_index(ctx
, count
, type
, indices
,
254 ctx
->Array
.ElementArrayBufferObj
);
255 if (max
>= ctx
->Array
._MaxElement
) {
256 /* the max element is out of bounds of one or more enabled arrays */
266 * Called from the tnl module to error check the function parameters and
267 * verify that we really can draw something.
268 * \return GL_TRUE if OK to render, GL_FALSE if error found
271 _mesa_validate_DrawArrays(GLcontext
*ctx
,
272 GLenum mode
, GLint start
, GLsizei count
)
274 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
278 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawArrays(count)" );
282 if (mode
> GL_POLYGON
) {
283 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawArrays(mode)" );
288 _mesa_update_state(ctx
);
290 if (!check_valid_to_render(ctx
, "Arrays"))
293 if (ctx
->Const
.CheckArrayBounds
) {
294 if (start
+ count
> (GLint
) ctx
->Array
._MaxElement
)