David Li | 1591693c | 2011-01-20 18:34:13 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Mesa 3-D graphics library |
| 3 | * Version: 7.1 |
| 4 | * |
| 5 | * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. |
| 6 | * |
| 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: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be included |
| 15 | * in all copies or substantial portions of the Software. |
| 16 | * |
| 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. |
| 23 | */ |
| 24 | |
| 25 | #include "glheader.h" |
| 26 | #include "api_validate.h" |
| 27 | #include "bufferobj.h" |
| 28 | #include "context.h" |
| 29 | #include "imports.h" |
| 30 | #include "mfeatures.h" |
| 31 | #include "mtypes.h" |
| 32 | #include "vbo/vbo.h" |
| 33 | |
| 34 | |
| 35 | /** |
| 36 | * \return number of bytes in array [count] of type. |
| 37 | */ |
| 38 | static GLsizei |
| 39 | index_bytes(GLenum type, GLsizei count) |
| 40 | { |
| 41 | if (type == GL_UNSIGNED_INT) { |
| 42 | return count * sizeof(GLuint); |
| 43 | } |
| 44 | else if (type == GL_UNSIGNED_BYTE) { |
| 45 | return count * sizeof(GLubyte); |
| 46 | } |
| 47 | else { |
| 48 | ASSERT(type == GL_UNSIGNED_SHORT); |
| 49 | return count * sizeof(GLushort); |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | |
| 54 | /** |
| 55 | * Find the max index in the given element/index buffer |
| 56 | */ |
| 57 | GLuint |
| 58 | _mesa_max_buffer_index(struct gl_context *ctx, GLuint count, GLenum type, |
| 59 | const void *indices, |
| 60 | struct gl_buffer_object *elementBuf) |
| 61 | { |
| 62 | const GLubyte *map = NULL; |
| 63 | GLuint max = 0; |
| 64 | GLuint i; |
| 65 | |
| 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); |
| 72 | } |
| 73 | |
| 74 | if (type == GL_UNSIGNED_INT) { |
| 75 | for (i = 0; i < count; i++) |
| 76 | if (((GLuint *) indices)[i] > max) |
| 77 | max = ((GLuint *) indices)[i]; |
| 78 | } |
| 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]; |
| 83 | } |
| 84 | else { |
| 85 | ASSERT(type == GL_UNSIGNED_BYTE); |
| 86 | for (i = 0; i < count; i++) |
| 87 | if (((GLubyte *) indices)[i] > max) |
| 88 | max = ((GLubyte *) indices)[i]; |
| 89 | } |
| 90 | |
| 91 | if (map) { |
| 92 | ctx->Driver.UnmapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER_ARB, elementBuf); |
| 93 | } |
| 94 | |
| 95 | return max; |
| 96 | } |
| 97 | |
| 98 | |
| 99 | /** |
| 100 | * Check if OK to draw arrays/elements. |
| 101 | */ |
| 102 | static GLboolean |
| 103 | check_valid_to_render(struct gl_context *ctx, const char *function) |
| 104 | { |
| 105 | if (!_mesa_valid_to_render(ctx, function)) { |
| 106 | return GL_FALSE; |
| 107 | } |
| 108 | |
| 109 | switch (ctx->API) { |
| 110 | #if FEATURE_es2_glsl |
| 111 | case API_OPENGLES2: |
| 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) |
| 115 | return GL_FALSE; |
| 116 | break; |
| 117 | #endif |
| 118 | |
| 119 | #if FEATURE_ES1 || FEATURE_GL |
| 120 | case API_OPENGLES: |
| 121 | case API_OPENGL: |
| 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) |
| 126 | return GL_FALSE; |
| 127 | break; |
| 128 | #endif |
| 129 | |
| 130 | default: |
| 131 | ASSERT_NO_FEATURE(); |
| 132 | } |
| 133 | |
| 134 | return GL_TRUE; |
| 135 | } |
| 136 | |
| 137 | |
| 138 | /** |
| 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 |
| 142 | */ |
| 143 | static GLboolean |
| 144 | check_index_bounds(struct gl_context *ctx, GLsizei count, GLenum type, |
| 145 | const GLvoid *indices, GLint basevertex) |
| 146 | { |
| 147 | struct _mesa_prim prim; |
| 148 | struct _mesa_index_buffer ib; |
| 149 | GLuint min, max; |
| 150 | |
| 151 | /* Only the X Server needs to do this -- otherwise, accessing outside |
| 152 | * array/BO bounds allows application termination. |
| 153 | */ |
| 154 | if (!ctx->Const.CheckArrayBounds) |
| 155 | return GL_TRUE; |
| 156 | |
| 157 | memset(&prim, 0, sizeof(prim)); |
| 158 | prim.count = count; |
| 159 | |
| 160 | memset(&ib, 0, sizeof(ib)); |
| 161 | ib.type = type; |
| 162 | ib.ptr = indices; |
| 163 | ib.obj = ctx->Array.ElementArrayBufferObj; |
| 164 | |
| 165 | vbo_get_minmax_index(ctx, &prim, &ib, &min, &max); |
| 166 | |
| 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); |
| 172 | return GL_FALSE; |
| 173 | } |
| 174 | |
| 175 | return GL_TRUE; |
| 176 | } |
| 177 | |
| 178 | |
| 179 | /** |
| 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 |
| 183 | */ |
| 184 | GLboolean |
| 185 | _mesa_validate_DrawElements(struct gl_context *ctx, |
| 186 | GLenum mode, GLsizei count, GLenum type, |
| 187 | const GLvoid *indices, GLint basevertex) |
| 188 | { |
| 189 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
| 190 | |
| 191 | if (count <= 0) { |
| 192 | if (count < 0) |
| 193 | _mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" ); |
| 194 | return GL_FALSE; |
| 195 | } |
| 196 | |
| 197 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
| 198 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" ); |
| 199 | return GL_FALSE; |
| 200 | } |
| 201 | |
| 202 | if (type != GL_UNSIGNED_INT && |
| 203 | type != GL_UNSIGNED_BYTE && |
| 204 | type != GL_UNSIGNED_SHORT) |
| 205 | { |
| 206 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" ); |
| 207 | return GL_FALSE; |
| 208 | } |
| 209 | |
| 210 | if (!check_valid_to_render(ctx, "glDrawElements")) |
| 211 | return GL_FALSE; |
| 212 | |
| 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"); |
| 219 | return GL_FALSE; |
| 220 | } |
| 221 | } |
| 222 | else { |
| 223 | /* not using a VBO */ |
| 224 | if (!indices) |
| 225 | return GL_FALSE; |
| 226 | } |
| 227 | |
| 228 | if (!check_index_bounds(ctx, count, type, indices, basevertex)) |
| 229 | return GL_FALSE; |
| 230 | |
| 231 | return GL_TRUE; |
| 232 | } |
| 233 | |
| 234 | |
| 235 | /** |
| 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 |
| 239 | */ |
| 240 | GLboolean |
| 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) |
| 245 | { |
| 246 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
| 247 | |
| 248 | if (count <= 0) { |
| 249 | if (count < 0) |
| 250 | _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" ); |
| 251 | return GL_FALSE; |
| 252 | } |
| 253 | |
| 254 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
| 255 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" ); |
| 256 | return GL_FALSE; |
| 257 | } |
| 258 | |
| 259 | if (end < start) { |
| 260 | _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)"); |
| 261 | return GL_FALSE; |
| 262 | } |
| 263 | |
| 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)" ); |
| 268 | return GL_FALSE; |
| 269 | } |
| 270 | |
| 271 | if (!check_valid_to_render(ctx, "glDrawRangeElements")) |
| 272 | return GL_FALSE; |
| 273 | |
| 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"); |
| 280 | return GL_FALSE; |
| 281 | } |
| 282 | } |
| 283 | else { |
| 284 | /* not using a VBO */ |
| 285 | if (!indices) |
| 286 | return GL_FALSE; |
| 287 | } |
| 288 | |
| 289 | if (!check_index_bounds(ctx, count, type, indices, basevertex)) |
| 290 | return GL_FALSE; |
| 291 | |
| 292 | return GL_TRUE; |
| 293 | } |
| 294 | |
| 295 | |
| 296 | /** |
| 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 |
| 300 | */ |
| 301 | GLboolean |
| 302 | _mesa_validate_DrawArrays(struct gl_context *ctx, |
| 303 | GLenum mode, GLint start, GLsizei count) |
| 304 | { |
| 305 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
| 306 | |
| 307 | if (count <= 0) { |
| 308 | if (count < 0) |
| 309 | _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" ); |
| 310 | return GL_FALSE; |
| 311 | } |
| 312 | |
| 313 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
| 314 | _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" ); |
| 315 | return GL_FALSE; |
| 316 | } |
| 317 | |
| 318 | if (!check_valid_to_render(ctx, "glDrawArrays")) |
| 319 | return GL_FALSE; |
| 320 | |
| 321 | if (ctx->Const.CheckArrayBounds) { |
| 322 | if (start + count > (GLint) ctx->Array.ArrayObj->_MaxElement) |
| 323 | return GL_FALSE; |
| 324 | } |
| 325 | |
| 326 | return GL_TRUE; |
| 327 | } |
| 328 | |
| 329 | |
| 330 | GLboolean |
| 331 | _mesa_validate_DrawArraysInstanced(struct gl_context *ctx, GLenum mode, GLint first, |
| 332 | GLsizei count, GLsizei primcount) |
| 333 | { |
| 334 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
| 335 | |
| 336 | if (count <= 0) { |
| 337 | if (count < 0) |
| 338 | _mesa_error(ctx, GL_INVALID_VALUE, |
| 339 | "glDrawArraysInstanced(count=%d)", count); |
| 340 | return GL_FALSE; |
| 341 | } |
| 342 | |
| 343 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
| 344 | _mesa_error(ctx, GL_INVALID_ENUM, |
| 345 | "glDrawArraysInstanced(mode=0x%x)", mode); |
| 346 | return GL_FALSE; |
| 347 | } |
| 348 | |
| 349 | if (primcount <= 0) { |
| 350 | if (primcount < 0) |
| 351 | _mesa_error(ctx, GL_INVALID_VALUE, |
| 352 | "glDrawArraysInstanced(primcount=%d)", primcount); |
| 353 | return GL_FALSE; |
| 354 | } |
| 355 | |
| 356 | if (!check_valid_to_render(ctx, "glDrawArraysInstanced(invalid to render)")) |
| 357 | return GL_FALSE; |
| 358 | |
| 359 | if (ctx->CompileFlag) { |
| 360 | _mesa_error(ctx, GL_INVALID_OPERATION, |
| 361 | "glDrawArraysInstanced(display list"); |
| 362 | return GL_FALSE; |
| 363 | } |
| 364 | |
| 365 | if (ctx->Const.CheckArrayBounds) { |
| 366 | if (first + count > (GLint) ctx->Array.ArrayObj->_MaxElement) |
| 367 | return GL_FALSE; |
| 368 | } |
| 369 | |
| 370 | return GL_TRUE; |
| 371 | } |
| 372 | |
| 373 | |
| 374 | GLboolean |
| 375 | _mesa_validate_DrawElementsInstanced(struct gl_context *ctx, |
| 376 | GLenum mode, GLsizei count, GLenum type, |
| 377 | const GLvoid *indices, GLsizei primcount) |
| 378 | { |
| 379 | ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); |
| 380 | |
| 381 | if (count <= 0) { |
| 382 | if (count < 0) |
| 383 | _mesa_error(ctx, GL_INVALID_VALUE, |
| 384 | "glDrawElementsInstanced(count=%d)", count); |
| 385 | return GL_FALSE; |
| 386 | } |
| 387 | |
| 388 | if (mode > GL_TRIANGLE_STRIP_ADJACENCY_ARB) { |
| 389 | _mesa_error(ctx, GL_INVALID_ENUM, |
| 390 | "glDrawElementsInstanced(mode = 0x%x)", mode); |
| 391 | return GL_FALSE; |
| 392 | } |
| 393 | |
| 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); |
| 399 | return GL_FALSE; |
| 400 | } |
| 401 | |
| 402 | if (primcount <= 0) { |
| 403 | if (primcount < 0) |
| 404 | _mesa_error(ctx, GL_INVALID_VALUE, |
| 405 | "glDrawElementsInstanced(primcount=%d)", primcount); |
| 406 | return GL_FALSE; |
| 407 | } |
| 408 | |
| 409 | if (!check_valid_to_render(ctx, "glDrawElementsInstanced")) |
| 410 | return GL_FALSE; |
| 411 | |
| 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) { |
| 417 | _mesa_warning(ctx, |
| 418 | "glDrawElementsInstanced index out of buffer bounds"); |
| 419 | return GL_FALSE; |
| 420 | } |
| 421 | } |
| 422 | else { |
| 423 | /* not using a VBO */ |
| 424 | if (!indices) |
| 425 | return GL_FALSE; |
| 426 | } |
| 427 | |
| 428 | if (!check_index_bounds(ctx, count, type, indices, 0)) |
| 429 | return GL_FALSE; |
| 430 | |
| 431 | return GL_TRUE; |
| 432 | } |