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)
121 /* For OpenGL ES, only draw if we have vertex positions
123 if (!ctx->Array.ArrayObj->Vertex.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->Vertex.Enabled ||
146 ctx->Array.ArrayObj->VertexAttrib[0].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.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 * Error checking for glDrawElements(). Includes parameter checking
203 * and VBO bounds checking.
204 * \return GL_TRUE if OK to render, GL_FALSE if error found
207 _mesa_validate_DrawElements(struct gl_context *ctx,
208 GLenum mode, GLsizei count, GLenum type,
209 const GLvoid *indices, GLint basevertex)
211 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
215 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" );
219 if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {
220 _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" );
224 if (type != GL_UNSIGNED_INT &&
225 type != GL_UNSIGNED_BYTE &&
226 type != GL_UNSIGNED_SHORT)
228 _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" );
232 if (!check_valid_to_render(ctx, "glDrawElements"))
235 /* Vertex buffer object tests */
236 if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {
237 /* use indices in the buffer object */
238 /* make sure count doesn't go outside buffer bounds */
239 if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) {
240 _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
245 /* not using a VBO */
250 if (!check_index_bounds(ctx, count, type, indices, basevertex))
258 * Error checking for glDrawRangeElements(). Includes parameter checking
259 * and VBO bounds checking.
260 * \return GL_TRUE if OK to render, GL_FALSE if error found
263 _mesa_validate_DrawRangeElements(struct gl_context *ctx, GLenum mode,
264 GLuint start, GLuint end,
265 GLsizei count, GLenum type,
266 const GLvoid *indices, GLint basevertex)
268 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
272 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
276 if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {
277 _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
282 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
286 if (type != GL_UNSIGNED_INT &&
287 type != GL_UNSIGNED_BYTE &&
288 type != GL_UNSIGNED_SHORT) {
289 _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
293 if (!check_valid_to_render(ctx, "glDrawRangeElements"))
296 /* Vertex buffer object tests */
297 if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {
298 /* use indices in the buffer object */
299 /* make sure count doesn't go outside buffer bounds */
300 if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) {
301 _mesa_warning(ctx, "glDrawRangeElements index out of buffer bounds");
306 /* not using a VBO */
311 if (!check_index_bounds(ctx, count, type, indices, basevertex))
319 * Called from the tnl module to error check the function parameters and
320 * verify that we really can draw something.
321 * \return GL_TRUE if OK to render, GL_FALSE if error found
324 _mesa_validate_DrawArrays(struct gl_context *ctx,
325 GLenum mode, GLint start, GLsizei count)
327 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
331 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
335 if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {
336 _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
340 if (!check_valid_to_render(ctx, "glDrawArrays"))
343 if (ctx->Const.CheckArrayBounds) {
344 if (start + count > (GLint) ctx->Array.ArrayObj->_MaxElement)
353 _mesa_validate_DrawArraysInstanced(struct gl_context *ctx, GLenum mode, GLint first,
354 GLsizei count, GLsizei numInstances)
356 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
360 _mesa_error(ctx, GL_INVALID_VALUE,
361 "glDrawArraysInstanced(count=%d)", count);
365 if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {
366 _mesa_error(ctx, GL_INVALID_ENUM,
367 "glDrawArraysInstanced(mode=0x%x)", mode);
371 if (numInstances <= 0) {
372 if (numInstances < 0)
373 _mesa_error(ctx, GL_INVALID_VALUE,
374 "glDrawArraysInstanced(numInstances=%d)", numInstances);
378 if (!check_valid_to_render(ctx, "glDrawArraysInstanced(invalid to render)"))
381 if (ctx->CompileFlag) {
382 _mesa_error(ctx, GL_INVALID_OPERATION,
383 "glDrawArraysInstanced(display list");
387 if (ctx->Const.CheckArrayBounds) {
388 if (first + count > (GLint) ctx->Array.ArrayObj->_MaxElement)
397 _mesa_validate_DrawElementsInstanced(struct gl_context *ctx,
398 GLenum mode, GLsizei count, GLenum type,
399 const GLvoid *indices, GLsizei numInstances,
402 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
406 _mesa_error(ctx, GL_INVALID_VALUE,
407 "glDrawElementsInstanced(count=%d)", count);
411 if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) {
412 _mesa_error(ctx, GL_INVALID_ENUM,
413 "glDrawElementsInstanced(mode = 0x%x)", mode);
417 if (type != GL_UNSIGNED_INT &&
418 type != GL_UNSIGNED_BYTE &&
419 type != GL_UNSIGNED_SHORT) {
420 _mesa_error(ctx, GL_INVALID_ENUM,
421 "glDrawElementsInstanced(type=0x%x)", type);
425 if (numInstances <= 0) {
426 if (numInstances < 0)
427 _mesa_error(ctx, GL_INVALID_VALUE,
428 "glDrawElementsInstanced(numInstances=%d)", numInstances);
432 if (!check_valid_to_render(ctx, "glDrawElementsInstanced"))
435 /* Vertex buffer object tests */
436 if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {
437 /* use indices in the buffer object */
438 /* make sure count doesn't go outside buffer bounds */
439 if (index_bytes(type, count) > ctx->Array.ElementArrayBufferObj->Size) {
441 "glDrawElementsInstanced index out of buffer bounds");
446 /* not using a VBO */
451 if (!check_index_bounds(ctx, count, type, indices, basevertex))