1 /************************************************************************** 2 * 3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 29 /** 30 * Framebuffer/renderbuffer functions. 31 * 32 * \author Brian Paul 33 */ 34 35 36 #include "main/imports.h" 37 #include "main/context.h" 38 #include "main/fbobject.h" 39 #include "main/framebuffer.h" 40 #include "main/macros.h" 41 #include "main/mfeatures.h" 42 #include "main/renderbuffer.h" 43 44 #include "pipe/p_context.h" 45 #include "pipe/p_defines.h" 46 #include "pipe/p_screen.h" 47 #include "st_context.h" 48 #include "st_cb_fbo.h" 49 #include "st_cb_flush.h" 50 #include "st_cb_texture.h" 51 #include "st_format.h" 52 #include "st_texture.h" 53 #include "st_manager.h" 54 55 #include "util/u_format.h" 56 #include "util/u_inlines.h" 57 #include "util/u_surface.h" 58 59 60 static GLboolean 61 st_renderbuffer_alloc_sw_storage(struct gl_context * ctx, 62 struct gl_renderbuffer *rb, 63 GLenum internalFormat, 64 GLuint width, GLuint height) 65 { 66 struct pipe_screen *screen = st_context(ctx)->pipe->screen; 67 struct st_renderbuffer *strb = st_renderbuffer(rb); 68 enum pipe_format format; 69 size_t size; 70 71 free(strb->data); 72 strb->data = NULL; 73 74 if (internalFormat == GL_RGBA16_SNORM) { 75 /* Special case for software accum buffers. Otherwise, if the 76 * call to st_choose_renderbuffer_format() fails (because the 77 * driver doesn't support signed 16-bit/channel colors) we'd 78 * just return without allocating the software accum buffer. 79 */ 80 format = PIPE_FORMAT_R16G16B16A16_SNORM; 81 } 82 else { 83 format = st_choose_renderbuffer_format(screen, internalFormat, 0); 84 85 /* Not setting gl_renderbuffer::Format here will cause 86 * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called. 87 */ 88 if (format == PIPE_FORMAT_NONE) { 89 return GL_TRUE; 90 } 91 } 92 93 strb->Base.Format = st_pipe_format_to_mesa_format(format); 94 95 size = _mesa_format_image_size(strb->Base.Format, width, height, 1); 96 strb->data = malloc(size); 97 return strb->data != NULL; 98 } 99 100 101 /** 102 * gl_renderbuffer::AllocStorage() 103 * This is called to allocate the original drawing surface, and 104 * during window resize. 105 */ 106 static GLboolean 107 st_renderbuffer_alloc_storage(struct gl_context * ctx, 108 struct gl_renderbuffer *rb, 109 GLenum internalFormat, 110 GLuint width, GLuint height) 111 { 112 struct st_context *st = st_context(ctx); 113 struct pipe_context *pipe = st->pipe; 114 struct pipe_screen *screen = st->pipe->screen; 115 struct st_renderbuffer *strb = st_renderbuffer(rb); 116 enum pipe_format format = PIPE_FORMAT_NONE; 117 struct pipe_surface surf_tmpl; 118 struct pipe_resource templ; 119 120 /* init renderbuffer fields */ 121 strb->Base.Width = width; 122 strb->Base.Height = height; 123 strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat); 124 strb->defined = GL_FALSE; /* undefined contents now */ 125 126 if (strb->software) { 127 return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat, 128 width, height); 129 } 130 131 /* Free the old surface and texture 132 */ 133 pipe_surface_reference( &strb->surface, NULL ); 134 pipe_resource_reference( &strb->texture, NULL ); 135 136 /* Handle multisample renderbuffers first. 137 * 138 * From ARB_framebuffer_object: 139 * If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero. 140 * Otherwise <samples> represents a request for a desired minimum 141 * number of samples. Since different implementations may support 142 * different sample counts for multisampled rendering, the actual 143 * number of samples allocated for the renderbuffer image is 144 * implementation dependent. However, the resulting value for 145 * RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal 146 * to <samples> and no more than the next larger sample count supported 147 * by the implementation. 148 * 149 * So let's find the supported number of samples closest to NumSamples. 150 * (NumSamples == 1) is treated the same as (NumSamples == 0). 151 */ 152 if (rb->NumSamples > 1) { 153 unsigned i; 154 155 for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) { 156 format = st_choose_renderbuffer_format(screen, internalFormat, i); 157 158 if (format != PIPE_FORMAT_NONE) { 159 rb->NumSamples = i; 160 break; 161 } 162 } 163 } else { 164 format = st_choose_renderbuffer_format(screen, internalFormat, 0); 165 } 166 167 /* Not setting gl_renderbuffer::Format here will cause 168 * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called. 169 */ 170 if (format == PIPE_FORMAT_NONE) { 171 return GL_TRUE; 172 } 173 174 strb->Base.Format = st_pipe_format_to_mesa_format(format); 175 176 if (width == 0 || height == 0) { 177 /* if size is zero, nothing to allocate */ 178 return GL_TRUE; 179 } 180 181 /* Setup new texture template. 182 */ 183 memset(&templ, 0, sizeof(templ)); 184 templ.target = st->internal_target; 185 templ.format = format; 186 templ.width0 = width; 187 templ.height0 = height; 188 templ.depth0 = 1; 189 templ.array_size = 1; 190 templ.nr_samples = rb->NumSamples; 191 if (util_format_is_depth_or_stencil(format)) { 192 templ.bind = PIPE_BIND_DEPTH_STENCIL; 193 } 194 else if (strb->Base.Name != 0) { 195 /* this is a user-created renderbuffer */ 196 templ.bind = PIPE_BIND_RENDER_TARGET; 197 } 198 else { 199 /* this is a window-system buffer */ 200 templ.bind = (PIPE_BIND_DISPLAY_TARGET | 201 PIPE_BIND_RENDER_TARGET); 202 } 203 204 strb->texture = screen->resource_create(screen, &templ); 205 206 if (!strb->texture) 207 return FALSE; 208 209 u_surface_default_template(&surf_tmpl, strb->texture, templ.bind); 210 strb->surface = pipe->create_surface(pipe, 211 strb->texture, 212 &surf_tmpl); 213 if (strb->surface) { 214 assert(strb->surface->texture); 215 assert(strb->surface->format); 216 assert(strb->surface->width == width); 217 assert(strb->surface->height == height); 218 } 219 220 return strb->surface != NULL; 221 } 222 223 224 /** 225 * gl_renderbuffer::Delete() 226 */ 227 static void 228 st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb) 229 { 230 struct st_renderbuffer *strb = st_renderbuffer(rb); 231 if (ctx) { 232 struct st_context *st = st_context(ctx); 233 pipe_surface_release(st->pipe, &strb->surface); 234 } 235 pipe_resource_reference(&strb->texture, NULL); 236 free(strb->data); 237 _mesa_delete_renderbuffer(ctx, rb); 238 } 239 240 241 /** 242 * Called via ctx->Driver.NewFramebuffer() 243 */ 244 static struct gl_framebuffer * 245 st_new_framebuffer(struct gl_context *ctx, GLuint name) 246 { 247 /* XXX not sure we need to subclass gl_framebuffer for pipe */ 248 return _mesa_new_framebuffer(ctx, name); 249 } 250 251 252 /** 253 * Called via ctx->Driver.NewRenderbuffer() 254 */ 255 static struct gl_renderbuffer * 256 st_new_renderbuffer(struct gl_context *ctx, GLuint name) 257 { 258 struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer); 259 if (strb) { 260 assert(name != 0); 261 _mesa_init_renderbuffer(&strb->Base, name); 262 strb->Base.Delete = st_renderbuffer_delete; 263 strb->Base.AllocStorage = st_renderbuffer_alloc_storage; 264 return &strb->Base; 265 } 266 return NULL; 267 } 268 269 270 /** 271 * Allocate a renderbuffer for a an on-screen window (not a user-created 272 * renderbuffer). The window system code determines the format. 273 */ 274 struct gl_renderbuffer * 275 st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw) 276 { 277 struct st_renderbuffer *strb; 278 279 strb = ST_CALLOC_STRUCT(st_renderbuffer); 280 if (!strb) { 281 _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer"); 282 return NULL; 283 } 284 285 _mesa_init_renderbuffer(&strb->Base, 0); 286 strb->Base.ClassID = 0x4242; /* just a unique value */ 287 strb->Base.NumSamples = samples; 288 strb->Base.Format = st_pipe_format_to_mesa_format(format); 289 strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format); 290 strb->software = sw; 291 292 switch (format) { 293 case PIPE_FORMAT_R8G8B8A8_UNORM: 294 case PIPE_FORMAT_B8G8R8A8_UNORM: 295 case PIPE_FORMAT_A8R8G8B8_UNORM: 296 strb->Base.InternalFormat = GL_RGBA8; 297 break; 298 case PIPE_FORMAT_R8G8B8X8_UNORM: 299 case PIPE_FORMAT_B8G8R8X8_UNORM: 300 case PIPE_FORMAT_X8R8G8B8_UNORM: 301 strb->Base.InternalFormat = GL_RGB8; 302 break; 303 case PIPE_FORMAT_B5G5R5A1_UNORM: 304 strb->Base.InternalFormat = GL_RGB5_A1; 305 break; 306 case PIPE_FORMAT_B4G4R4A4_UNORM: 307 strb->Base.InternalFormat = GL_RGBA4; 308 break; 309 case PIPE_FORMAT_B5G6R5_UNORM: 310 strb->Base.InternalFormat = GL_RGB565; 311 break; 312 case PIPE_FORMAT_Z16_UNORM: 313 strb->Base.InternalFormat = GL_DEPTH_COMPONENT16; 314 break; 315 case PIPE_FORMAT_Z32_UNORM: 316 strb->Base.InternalFormat = GL_DEPTH_COMPONENT32; 317 break; 318 case PIPE_FORMAT_Z24_UNORM_S8_UINT: 319 case PIPE_FORMAT_S8_UINT_Z24_UNORM: 320 case PIPE_FORMAT_Z24X8_UNORM: 321 case PIPE_FORMAT_X8Z24_UNORM: 322 strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT; 323 break; 324 case PIPE_FORMAT_S8_UINT: 325 strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT; 326 break; 327 case PIPE_FORMAT_R16G16B16A16_SNORM: 328 /* accum buffer */ 329 strb->Base.InternalFormat = GL_RGBA16_SNORM; 330 break; 331 case PIPE_FORMAT_R8_UNORM: 332 strb->Base.InternalFormat = GL_R8; 333 break; 334 case PIPE_FORMAT_R8G8_UNORM: 335 strb->Base.InternalFormat = GL_RG8; 336 break; 337 case PIPE_FORMAT_R16_UNORM: 338 strb->Base.InternalFormat = GL_R16; 339 break; 340 case PIPE_FORMAT_R16G16_UNORM: 341 strb->Base.InternalFormat = GL_RG16; 342 break; 343 case PIPE_FORMAT_R32G32B32A32_FLOAT: 344 strb->Base.InternalFormat = GL_RGBA32F; 345 break; 346 case PIPE_FORMAT_R16G16B16A16_FLOAT: 347 strb->Base.InternalFormat = GL_RGBA16F; 348 break; 349 default: 350 _mesa_problem(NULL, 351 "Unexpected format %s in st_new_renderbuffer_fb", 352 util_format_name(format)); 353 free(strb); 354 return NULL; 355 } 356 357 /* st-specific methods */ 358 strb->Base.Delete = st_renderbuffer_delete; 359 strb->Base.AllocStorage = st_renderbuffer_alloc_storage; 360 361 /* surface is allocated in st_renderbuffer_alloc_storage() */ 362 strb->surface = NULL; 363 364 return &strb->Base; 365 } 366 367 368 /** 369 * Called via ctx->Driver.BindFramebufferEXT(). 370 */ 371 static void 372 st_bind_framebuffer(struct gl_context *ctx, GLenum target, 373 struct gl_framebuffer *fb, struct gl_framebuffer *fbread) 374 { 375 /* no-op */ 376 } 377 378 379 /** 380 * Called by ctx->Driver.RenderTexture 381 */ 382 static void 383 st_render_texture(struct gl_context *ctx, 384 struct gl_framebuffer *fb, 385 struct gl_renderbuffer_attachment *att) 386 { 387 struct st_context *st = st_context(ctx); 388 struct pipe_context *pipe = st->pipe; 389 struct st_renderbuffer *strb; 390 struct gl_renderbuffer *rb; 391 struct pipe_resource *pt; 392 struct st_texture_object *stObj; 393 const struct gl_texture_image *texImage; 394 struct pipe_surface surf_tmpl; 395 396 if (!st_finalize_texture(ctx, pipe, att->Texture)) 397 return; 398 399 pt = st_get_texobj_resource(att->Texture); 400 assert(pt); 401 402 /* get pointer to texture image we're rendeing to */ 403 texImage = _mesa_get_attachment_teximage(att); 404 405 /* create new renderbuffer which wraps the texture image. 406 * Use the texture's name as the renderbuffer's name so that we have 407 * something that's non-zero (to determine vertical orientation) and 408 * possibly helpful for debugging. 409 */ 410 rb = st_new_renderbuffer(ctx, att->Texture->Name); 411 if (!rb) { 412 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()"); 413 return; 414 } 415 416 _mesa_reference_renderbuffer(&att->Renderbuffer, rb); 417 assert(rb->RefCount == 1); 418 rb->AllocStorage = NULL; /* should not get called */ 419 strb = st_renderbuffer(rb); 420 421 assert(strb->Base.RefCount > 0); 422 423 /* get the texture for the texture object */ 424 stObj = st_texture_object(att->Texture); 425 426 /* point renderbuffer at texobject */ 427 strb->rtt = stObj; 428 strb->rtt_level = att->TextureLevel; 429 strb->rtt_face = att->CubeMapFace; 430 strb->rtt_slice = att->Zoffset; 431 432 rb->Width = texImage->Width2; 433 rb->Height = texImage->Height2; 434 rb->_BaseFormat = texImage->_BaseFormat; 435 rb->InternalFormat = texImage->InternalFormat; 436 437 pipe_resource_reference( &strb->texture, pt ); 438 439 pipe_surface_release(pipe, &strb->surface); 440 441 assert(strb->rtt_level <= strb->texture->last_level); 442 443 /* new surface for rendering into the texture */ 444 memset(&surf_tmpl, 0, sizeof(surf_tmpl)); 445 surf_tmpl.format = ctx->Color.sRGBEnabled 446 ? strb->texture->format : util_format_linear(strb->texture->format); 447 surf_tmpl.usage = PIPE_BIND_RENDER_TARGET; 448 surf_tmpl.u.tex.level = strb->rtt_level; 449 surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice; 450 surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice; 451 strb->surface = pipe->create_surface(pipe, 452 strb->texture, 453 &surf_tmpl); 454 455 strb->Base.Format = st_pipe_format_to_mesa_format(pt->format); 456 457 /* Invalidate buffer state so that the pipe's framebuffer state 458 * gets updated. 459 * That's where the new renderbuffer (which we just created) gets 460 * passed to the pipe as a (color/depth) render target. 461 */ 462 st_invalidate_state(ctx, _NEW_BUFFERS); 463 464 465 /* Need to trigger a call to update_framebuffer() since we just 466 * attached a new renderbuffer. 467 */ 468 ctx->NewState |= _NEW_BUFFERS; 469 } 470 471 472 /** 473 * Called via ctx->Driver.FinishRenderTexture. 474 */ 475 static void 476 st_finish_render_texture(struct gl_context *ctx, 477 struct gl_renderbuffer_attachment *att) 478 { 479 struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer); 480 481 if (!strb) 482 return; 483 484 strb->rtt = NULL; 485 486 /* restore previous framebuffer state */ 487 st_invalidate_state(ctx, _NEW_BUFFERS); 488 } 489 490 491 /** Debug helper */ 492 static void 493 st_fbo_invalid(const char *reason) 494 { 495 if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) { 496 _mesa_debug(NULL, "Invalid FBO: %s\n", reason); 497 } 498 } 499 500 501 /** 502 * Validate a renderbuffer attachment for a particular set of bindings. 503 */ 504 static GLboolean 505 st_validate_attachment(struct gl_context *ctx, 506 struct pipe_screen *screen, 507 const struct gl_renderbuffer_attachment *att, 508 unsigned bindings) 509 { 510 const struct st_texture_object *stObj = st_texture_object(att->Texture); 511 enum pipe_format format; 512 gl_format texFormat; 513 GLboolean valid; 514 515 /* Only validate texture attachments for now, since 516 * st_renderbuffer_alloc_storage makes sure that 517 * the format is supported. 518 */ 519 if (att->Type != GL_TEXTURE) 520 return GL_TRUE; 521 522 if (!stObj) 523 return GL_FALSE; 524 525 format = stObj->pt->format; 526 texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat; 527 528 /* If the encoding is sRGB and sRGB rendering cannot be enabled, 529 * check for linear format support instead. 530 * Later when we create a surface, we change the format to a linear one. */ 531 if (!ctx->Extensions.EXT_framebuffer_sRGB && 532 _mesa_get_format_color_encoding(texFormat) == GL_SRGB) { 533 const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat); 534 format = st_mesa_format_to_pipe_format(linearFormat); 535 } 536 537 valid = screen->is_format_supported(screen, format, 538 PIPE_TEXTURE_2D, 539 stObj->pt->nr_samples, bindings); 540 if (!valid) { 541 st_fbo_invalid("Invalid format"); 542 } 543 544 return valid; 545 } 546 547 548 /** 549 * Check if two renderbuffer attachments name a combined depth/stencil 550 * renderbuffer. 551 */ 552 GLboolean 553 st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth, 554 const struct gl_renderbuffer_attachment *stencil) 555 { 556 assert(depth && stencil); 557 558 if (depth->Type == stencil->Type) { 559 if (depth->Type == GL_RENDERBUFFER_EXT && 560 depth->Renderbuffer == stencil->Renderbuffer) 561 return GL_TRUE; 562 563 if (depth->Type == GL_TEXTURE && 564 depth->Texture == stencil->Texture) 565 return GL_TRUE; 566 } 567 568 return GL_FALSE; 569 } 570 571 572 /** 573 * Check that the framebuffer configuration is valid in terms of what 574 * the driver can support. 575 * 576 * For Gallium we only supports combined Z+stencil, not separate buffers. 577 */ 578 static void 579 st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb) 580 { 581 struct st_context *st = st_context(ctx); 582 struct pipe_screen *screen = st->pipe->screen; 583 const struct gl_renderbuffer_attachment *depth = 584 &fb->Attachment[BUFFER_DEPTH]; 585 const struct gl_renderbuffer_attachment *stencil = 586 &fb->Attachment[BUFFER_STENCIL]; 587 GLuint i; 588 enum pipe_format first_format = PIPE_FORMAT_NONE; 589 boolean mixed_formats = 590 screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0; 591 592 if (depth->Type && stencil->Type && depth->Type != stencil->Type) { 593 st_fbo_invalid("Different Depth/Stencil buffer formats"); 594 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT; 595 return; 596 } 597 if (depth->Type == GL_RENDERBUFFER_EXT && 598 stencil->Type == GL_RENDERBUFFER_EXT && 599 depth->Renderbuffer != stencil->Renderbuffer) { 600 st_fbo_invalid("Separate Depth/Stencil buffers"); 601 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT; 602 return; 603 } 604 if (depth->Type == GL_TEXTURE && 605 stencil->Type == GL_TEXTURE && 606 depth->Texture != stencil->Texture) { 607 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT; 608 st_fbo_invalid("Different Depth/Stencil textures"); 609 return; 610 } 611 612 if (!st_validate_attachment(ctx, 613 screen, 614 depth, 615 PIPE_BIND_DEPTH_STENCIL)) { 616 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT; 617 return; 618 } 619 if (!st_validate_attachment(ctx, 620 screen, 621 stencil, 622 PIPE_BIND_DEPTH_STENCIL)) { 623 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT; 624 return; 625 } 626 for (i = 0; i < ctx->Const.MaxColorAttachments; i++) { 627 struct gl_renderbuffer_attachment *att = 628 &fb->Attachment[BUFFER_COLOR0 + i]; 629 enum pipe_format format; 630 631 if (!st_validate_attachment(ctx, 632 screen, 633 att, 634 PIPE_BIND_RENDER_TARGET)) { 635 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT; 636 return; 637 } 638 639 if (!mixed_formats) { 640 /* Disallow mixed formats. */ 641 if (att->Type != GL_NONE) { 642 format = st_renderbuffer(att->Renderbuffer)->surface->format; 643 } else { 644 continue; 645 } 646 647 if (first_format == PIPE_FORMAT_NONE) { 648 first_format = format; 649 } else if (format != first_format) { 650 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT; 651 st_fbo_invalid("Mixed color formats"); 652 return; 653 } 654 } 655 } 656 } 657 658 659 /** 660 * Called via glDrawBuffer. 661 */ 662 static void 663 st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers) 664 { 665 struct st_context *st = st_context(ctx); 666 struct gl_framebuffer *fb = ctx->DrawBuffer; 667 GLuint i; 668 669 (void) count; 670 (void) buffers; 671 672 /* add the renderbuffers on demand */ 673 for (i = 0; i < fb->_NumColorDrawBuffers; i++) { 674 gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i]; 675 st_manager_add_color_renderbuffer(st, fb, idx); 676 } 677 } 678 679 680 /** 681 * Called via glReadBuffer. 682 */ 683 static void 684 st_ReadBuffer(struct gl_context *ctx, GLenum buffer) 685 { 686 struct st_context *st = st_context(ctx); 687 struct gl_framebuffer *fb = ctx->ReadBuffer; 688 689 (void) buffer; 690 691 /* add the renderbuffer on demand */ 692 st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex); 693 } 694 695 696 697 /** 698 * Called via ctx->Driver.MapRenderbuffer. 699 */ 700 static void 701 st_MapRenderbuffer(struct gl_context *ctx, 702 struct gl_renderbuffer *rb, 703 GLuint x, GLuint y, GLuint w, GLuint h, 704 GLbitfield mode, 705 GLubyte **mapOut, GLint *rowStrideOut) 706 { 707 struct st_context *st = st_context(ctx); 708 struct st_renderbuffer *strb = st_renderbuffer(rb); 709 struct pipe_context *pipe = st->pipe; 710 const GLboolean invert = rb->Name == 0; 711 unsigned usage; 712 GLuint y2; 713 714 if (strb->software) { 715 /* software-allocated renderbuffer (probably an accum buffer) */ 716 if (strb->data) { 717 GLint bpp = _mesa_get_format_bytes(strb->Base.Format); 718 GLint stride = _mesa_format_row_stride(strb->Base.Format, 719 strb->Base.Width); 720 *mapOut = (GLubyte *) strb->data + y * stride + x * bpp; 721 *rowStrideOut = stride; 722 } 723 else { 724 *mapOut = NULL; 725 *rowStrideOut = 0; 726 } 727 return; 728 } 729 730 usage = 0x0; 731 if (mode & GL_MAP_READ_BIT) 732 usage |= PIPE_TRANSFER_READ; 733 if (mode & GL_MAP_WRITE_BIT) 734 usage |= PIPE_TRANSFER_WRITE; 735 if (mode & GL_MAP_INVALIDATE_RANGE_BIT) 736 usage |= PIPE_TRANSFER_DISCARD_RANGE; 737 738 /* Note: y=0=bottom of buffer while y2=0=top of buffer. 739 * 'invert' will be true for window-system buffers and false for 740 * user-allocated renderbuffers and textures. 741 */ 742 if (invert) 743 y2 = strb->Base.Height - y - h; 744 else 745 y2 = y; 746 747 strb->transfer = pipe_get_transfer(pipe, 748 strb->texture, 749 strb->rtt_level, 750 strb->rtt_face + strb->rtt_slice, 751 usage, x, y2, w, h); 752 if (strb->transfer) { 753 GLubyte *map = pipe_transfer_map(pipe, strb->transfer); 754 if (invert) { 755 *rowStrideOut = -strb->transfer->stride; 756 map += (h - 1) * strb->transfer->stride; 757 } 758 else { 759 *rowStrideOut = strb->transfer->stride; 760 } 761 *mapOut = map; 762 } 763 else { 764 *mapOut = NULL; 765 *rowStrideOut = 0; 766 } 767 } 768 769 770 /** 771 * Called via ctx->Driver.UnmapRenderbuffer. 772 */ 773 static void 774 st_UnmapRenderbuffer(struct gl_context *ctx, 775 struct gl_renderbuffer *rb) 776 { 777 struct st_context *st = st_context(ctx); 778 struct st_renderbuffer *strb = st_renderbuffer(rb); 779 struct pipe_context *pipe = st->pipe; 780 781 if (strb->software) { 782 /* software-allocated renderbuffer (probably an accum buffer) */ 783 return; 784 } 785 786 pipe_transfer_unmap(pipe, strb->transfer); 787 pipe->transfer_destroy(pipe, strb->transfer); 788 strb->transfer = NULL; 789 } 790 791 792 793 void st_init_fbo_functions(struct dd_function_table *functions) 794 { 795 #if FEATURE_EXT_framebuffer_object 796 functions->NewFramebuffer = st_new_framebuffer; 797 functions->NewRenderbuffer = st_new_renderbuffer; 798 functions->BindFramebuffer = st_bind_framebuffer; 799 functions->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer; 800 functions->RenderTexture = st_render_texture; 801 functions->FinishRenderTexture = st_finish_render_texture; 802 functions->ValidateFramebuffer = st_validate_framebuffer; 803 #endif 804 805 functions->DrawBuffers = st_DrawBuffers; 806 functions->ReadBuffer = st_ReadBuffer; 807 808 functions->MapRenderbuffer = st_MapRenderbuffer; 809 functions->UnmapRenderbuffer = st_UnmapRenderbuffer; 810 } 811 812 813
