src/mesa/state_tracker/st_cb_clear.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
   5  * Copyright 2009 VMware, Inc.  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
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29  /*
  30   * Authors:
  31   *   Keith Whitwell <keithw@vmware.com>
  32   *   Brian Paul
  33   *   Michel Dänzer
  34   */
  35
  36 #include "main/errors.h"
  37 #include "main/glheader.h"
  38 #include "main/accum.h"
  39 #include "main/formats.h"
  40 #include "main/framebuffer.h"
  41 #include "main/macros.h"
  42 #include "main/glformats.h"
  43 #include "program/prog_instruction.h"
  44 #include "st_context.h"
  45 #include "st_atom.h"
  46 #include "st_cb_bitmap.h"
  47 #include "st_cb_clear.h"
  48 #include "st_cb_fbo.h"
  49 #include "st_draw.h"
  50 #include "st_format.h"
  51 #include "st_nir.h"
  52 #include "st_program.h"
  53 #include "st_util.h"
  54
  55 #include "pipe/p_context.h"
  56 #include "pipe/p_shader_tokens.h"
  57 #include "pipe/p_state.h"
  58 #include "pipe/p_defines.h"
  59 #include "util/u_format.h"
  60 #include "util/u_inlines.h"
  61 #include "util/u_simple_shaders.h"
  62
  63 #include "cso_cache/cso_context.h"
  64
  65
  66 /**
  67  * Do per-context initialization for glClear.
  68  */
  69 void
  70 st_init_clear(struct st_context *st)
  71 {
  72    memset(&st->clear, 0, sizeof(st->clear));
  73
  74    st->clear.raster.half_pixel_center = 1;
  75    st->clear.raster.bottom_edge_rule = 1;
  76    st->clear.raster.depth_clip_near = 1;
  77    st->clear.raster.depth_clip_far = 1;
  78 }
  79
  80
  81 /**
  82  * Free per-context state for glClear.
  83  */
  84 void
  85 st_destroy_clear(struct st_context *st)
  86 {
  87    if (st->clear.fs) {
  88       cso_delete_fragment_shader(st->cso_context, st->clear.fs);
  89       st->clear.fs = NULL;
  90    }
  91    if (st->clear.vs) {
  92       cso_delete_vertex_shader(st->cso_context, st->clear.vs);
  93       st->clear.vs = NULL;
  94    }
  95    if (st->clear.vs_layered) {
  96       cso_delete_vertex_shader(st->cso_context, st->clear.vs_layered);
  97       st->clear.vs_layered = NULL;
  98    }
  99    if (st->clear.gs_layered) {
 100       cso_delete_geometry_shader(st->cso_context, st->clear.gs_layered);
 101       st->clear.gs_layered = NULL;
 102    }
 103 }
 104
 105
 106 /**
 107  * Helper function to set the fragment shaders.
 108  */
 109 static inline void
 110 set_fragment_shader(struct st_context *st)
 111 {
 112    struct pipe_screen *pscreen = st->pipe->screen;
 113    bool use_nir = PIPE_SHADER_IR_NIR ==
 114       pscreen->get_shader_param(pscreen, PIPE_SHADER_VERTEX,
 115                                 PIPE_SHADER_CAP_PREFERRED_IR);
 116
 117    if (!st->clear.fs) {
 118       if (use_nir) {
 119          unsigned inputs[] = { VARYING_SLOT_VAR0 };
 120          unsigned outputs[] = { FRAG_RESULT_COLOR };
 121          unsigned interpolation[] = { INTERP_MODE_FLAT };
 122          st->clear.fs = st_nir_make_passthrough_shader(st, "clear FS",
 123                                                        MESA_SHADER_FRAGMENT,
 124                                                        1, inputs, outputs,
 125                                                        interpolation, 0);
 126       } else {
 127          st->clear.fs =
 128             util_make_fragment_passthrough_shader(st->pipe,
 129                                                   TGSI_SEMANTIC_GENERIC,
 130                                                   TGSI_INTERPOLATE_CONSTANT,
 131                                                   TRUE);
 132       }
 133    }
 134
 135    cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
 136 }
 137
 138
 139 static void *
 140 make_nir_clear_vertex_shader(struct st_context *st, bool layered)
 141 {
 142    const char *shader_name = layered ? "layered clear VS" : "clear VS";
 143    unsigned inputs[] = {
 144       VERT_ATTRIB_POS,
 145       VERT_ATTRIB_GENERIC0,
 146       SYSTEM_VALUE_INSTANCE_ID,
 147    };
 148    unsigned outputs[] = {
 149       VARYING_SLOT_POS,
 150       VARYING_SLOT_VAR0,
 151       VARYING_SLOT_LAYER
 152    };
 153
 154    return st_nir_make_passthrough_shader(st, shader_name, MESA_SHADER_VERTEX,
 155                                          layered ? 3 : 2, inputs, outputs,
 156                                          NULL, (1 << 2));
 157 }
 158
 159
 160 /**
 161  * Helper function to set the vertex shader.
 162  */
 163 static inline void
 164 set_vertex_shader(struct st_context *st)
 165 {
 166    struct pipe_screen *pscreen = st->pipe->screen;
 167    bool use_nir = PIPE_SHADER_IR_NIR ==
 168       pscreen->get_shader_param(pscreen, PIPE_SHADER_VERTEX,
 169                                 PIPE_SHADER_CAP_PREFERRED_IR);
 170
 171    /* vertex shader - still required to provide the linkage between
 172     * fragment shader input semantics and vertex_element/buffers.
 173     */
 174    if (!st->clear.vs)
 175    {
 176       if (use_nir) {
 177          st->clear.vs = make_nir_clear_vertex_shader(st, false);
 178       } else {
 179          const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 180                                          TGSI_SEMANTIC_GENERIC };
 181          const uint semantic_indexes[] = { 0, 0 };
 182          st->clear.vs = util_make_vertex_passthrough_shader(st->pipe, 2,
 183                                                             semantic_names,
 184                                                             semantic_indexes,
 185                                                             FALSE);
 186       }
 187    }
 188
 189    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
 190    cso_set_geometry_shader_handle(st->cso_context, NULL);
 191 }
 192
 193
 194 static void
 195 set_vertex_shader_layered(struct st_context *st)
 196 {
 197    struct pipe_context *pipe = st->pipe;
 198    struct pipe_screen *pscreen = pipe->screen;
 199    bool use_nir = PIPE_SHADER_IR_NIR ==
 200       pscreen->get_shader_param(pscreen, PIPE_SHADER_VERTEX,
 201                                 PIPE_SHADER_CAP_PREFERRED_IR);
 202
 203    if (!pipe->screen->get_param(pipe->screen, PIPE_CAP_TGSI_INSTANCEID)) {
 204       assert(!"Got layered clear, but VS instancing is unsupported");
 205       set_vertex_shader(st);
 206       return;
 207    }
 208
 209    if (!st->clear.vs_layered) {
 210       bool vs_layer =
 211          pipe->screen->get_param(pipe->screen, PIPE_CAP_TGSI_VS_LAYER_VIEWPORT);
 212       if (vs_layer) {
 213          st->clear.vs_layered =
 214             use_nir ? make_nir_clear_vertex_shader(st, true)
 215                     : util_make_layered_clear_vertex_shader(pipe);
 216       } else {
 217          st->clear.vs_layered = util_make_layered_clear_helper_vertex_shader(pipe);
 218          st->clear.gs_layered = util_make_layered_clear_geometry_shader(pipe);
 219       }
 220    }
 221
 222    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs_layered);
 223    cso_set_geometry_shader_handle(st->cso_context, st->clear.gs_layered);
 224 }
 225
 226
 227 /**
 228  * Do glClear by drawing a quadrilateral.
 229  * The vertices of the quad will be computed from the
 230  * ctx->DrawBuffer->_X/Ymin/max fields.
 231  */
 232 static void
 233 clear_with_quad(struct gl_context *ctx, unsigned clear_buffers)
 234 {
 235    struct st_context *st = st_context(ctx);
 236    struct cso_context *cso = st->cso_context;
 237    const struct gl_framebuffer *fb = ctx->DrawBuffer;
 238    const GLfloat fb_width = (GLfloat) fb->Width;
 239    const GLfloat fb_height = (GLfloat) fb->Height;
 240
 241    _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
 242
 243    const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin / fb_width * 2.0f - 1.0f;
 244    const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax / fb_width * 2.0f - 1.0f;
 245    const GLfloat y0 = (GLfloat) ctx->DrawBuffer->_Ymin / fb_height * 2.0f - 1.0f;
 246    const GLfloat y1 = (GLfloat) ctx->DrawBuffer->_Ymax / fb_height * 2.0f - 1.0f;
 247    unsigned num_layers = st->state.fb_num_layers;
 248
 249    /*
 250    printf("%s %s%s%s %f,%f %f,%f\n", __func__,
 251           color ? "color, " : "",
 252           depth ? "depth, " : "",
 253           stencil ? "stencil" : "",
 254           x0, y0,
 255           x1, y1);
 256    */
 257
 258    cso_save_state(cso, (CSO_BIT_BLEND |
 259                         CSO_BIT_STENCIL_REF |
 260                         CSO_BIT_DEPTH_STENCIL_ALPHA |
 261                         CSO_BIT_RASTERIZER |
 262                         CSO_BIT_SAMPLE_MASK |
 263                         CSO_BIT_MIN_SAMPLES |
 264                         CSO_BIT_VIEWPORT |
 265                         CSO_BIT_STREAM_OUTPUTS |
 266                         CSO_BIT_VERTEX_ELEMENTS |
 267                         CSO_BIT_AUX_VERTEX_BUFFER_SLOT |
 268                         CSO_BIT_PAUSE_QUERIES |
 269                         CSO_BITS_ALL_SHADERS));
 270
 271    /* blend state: RGBA masking */
 272    {
 273       struct pipe_blend_state blend;
 274       memset(&blend, 0, sizeof(blend));
 275       if (clear_buffers & PIPE_CLEAR_COLOR) {
 276          int num_buffers = ctx->Extensions.EXT_draw_buffers2 ?
 277                            ctx->DrawBuffer->_NumColorDrawBuffers : 1;
 278          int i;
 279
 280          blend.independent_blend_enable = num_buffers > 1;
 281
 282          for (i = 0; i < num_buffers; i++) {
 283             if (!(clear_buffers & (PIPE_CLEAR_COLOR0 << i)))
 284                continue;
 285
 286             blend.rt[i].colormask = GET_COLORMASK(ctx->Color.ColorMask, i);
 287          }
 288
 289          if (ctx->Color.DitherFlag)
 290             blend.dither = 1;
 291       }
 292       cso_set_blend(cso, &blend);
 293    }
 294
 295    /* depth_stencil state: always pass/set to ref value */
 296    {
 297       struct pipe_depth_stencil_alpha_state depth_stencil;
 298       memset(&depth_stencil, 0, sizeof(depth_stencil));
 299       if (clear_buffers & PIPE_CLEAR_DEPTH) {
 300          depth_stencil.depth.enabled = 1;
 301          depth_stencil.depth.writemask = 1;
 302          depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
 303       }
 304
 305       if (clear_buffers & PIPE_CLEAR_STENCIL) {
 306          struct pipe_stencil_ref stencil_ref;
 307          memset(&stencil_ref, 0, sizeof(stencil_ref));
 308          depth_stencil.stencil[0].enabled = 1;
 309          depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
 310          depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
 311          depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
 312          depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
 313          depth_stencil.stencil[0].valuemask = 0xff;
 314          depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
 315          stencil_ref.ref_value[0] = ctx->Stencil.Clear;
 316          cso_set_stencil_ref(cso, &stencil_ref);
 317       }
 318
 319       cso_set_depth_stencil_alpha(cso, &depth_stencil);
 320    }
 321
 322    cso_set_vertex_elements(cso, 2, st->util_velems);
 323    cso_set_stream_outputs(cso, 0, NULL, NULL);
 324    cso_set_sample_mask(cso, ~0);
 325    cso_set_min_samples(cso, 1);
 326    cso_set_rasterizer(cso, &st->clear.raster);
 327
 328    /* viewport state: viewport matching window dims */
 329    cso_set_viewport_dims(st->cso_context, fb_width, fb_height,
 330                          st_fb_orientation(fb) == Y_0_TOP);
 331
 332    set_fragment_shader(st);
 333    cso_set_tessctrl_shader_handle(cso, NULL);
 334    cso_set_tesseval_shader_handle(cso, NULL);
 335
 336    if (num_layers > 1)
 337       set_vertex_shader_layered(st);
 338    else
 339       set_vertex_shader(st);
 340
 341    /* draw quad matching scissor rect.
 342     *
 343     * Note: if we're only clearing depth/stencil we still setup vertices
 344     * with color, but they'll be ignored.
 345     *
 346     * We can't translate the clear color to the colorbuffer format,
 347     * because different colorbuffers may have different formats.
 348     */
 349    if (!st_draw_quad(st, x0, y0, x1, y1,
 350                      ctx->Depth.Clear * 2.0f - 1.0f,
 351                      0.0f, 0.0f, 0.0f, 0.0f,
 352                      (const float *) &ctx->Color.ClearColor.f,
 353                      num_layers)) {
 354       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glClear");
 355    }
 356
 357    /* Restore pipe state */
 358    cso_restore_state(cso);
 359 }
 360
 361
 362 /**
 363  * Return if the scissor must be enabled during the clear.
 364  */
 365 static inline GLboolean
 366 is_scissor_enabled(struct gl_context *ctx, struct gl_renderbuffer *rb)
 367 {
 368    const struct gl_scissor_rect *scissor = &ctx->Scissor.ScissorArray[0];
 369
 370    return (ctx->Scissor.EnableFlags & 1) &&
 371           (scissor->X > 0 ||
 372            scissor->Y > 0 ||
 373            scissor->X + scissor->Width < (int)rb->Width ||
 374            scissor->Y + scissor->Height < (int)rb->Height);
 375 }
 376
 377 /**
 378  * Return if window rectangles must be enabled during the clear.
 379  */
 380 static inline bool
 381 is_window_rectangle_enabled(struct gl_context *ctx)
 382 {
 383    if (ctx->DrawBuffer == ctx->WinSysDrawBuffer)
 384       return false;
 385    return ctx->Scissor.NumWindowRects > 0 ||
 386       ctx->Scissor.WindowRectMode == GL_INCLUSIVE_EXT;
 387 }
 388
 389
 390 /**
 391  * Return if all of the stencil bits are masked.
 392  */
 393 static inline GLboolean
 394 is_stencil_disabled(struct gl_context *ctx, struct gl_renderbuffer *rb)
 395 {
 396    const GLuint stencilMax = 0xff;
 397
 398    assert(_mesa_get_format_bits(rb->Format, GL_STENCIL_BITS) > 0);
 399    return (ctx->Stencil.WriteMask[0] & stencilMax) == 0;
 400 }
 401
 402
 403 /**
 404  * Return if any of the stencil bits are masked.
 405  */
 406 static inline GLboolean
 407 is_stencil_masked(struct gl_context *ctx, struct gl_renderbuffer *rb)
 408 {
 409    const GLuint stencilMax = 0xff;
 410
 411    assert(_mesa_get_format_bits(rb->Format, GL_STENCIL_BITS) > 0);
 412    return (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 413 }
 414
 415
 416 /**
 417  * Called via ctx->Driver.Clear()
 418  */
 419 static void
 420 st_Clear(struct gl_context *ctx, GLbitfield mask)
 421 {
 422    struct st_context *st = st_context(ctx);
 423    struct gl_renderbuffer *depthRb
 424       = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 425    struct gl_renderbuffer *stencilRb
 426       = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 427    GLbitfield quad_buffers = 0x0;
 428    GLbitfield clear_buffers = 0x0;
 429    GLuint i;
 430
 431    st_flush_bitmap_cache(st);
 432    st_invalidate_readpix_cache(st);
 433
 434    /* This makes sure the pipe has the latest scissor, etc values */
 435    st_validate_state(st, ST_PIPELINE_CLEAR);
 436
 437    if (mask & BUFFER_BITS_COLOR) {
 438       for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
 439          gl_buffer_index b = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
 440
 441          if (b != BUFFER_NONE && mask & (1 << b)) {
 442             struct gl_renderbuffer *rb
 443                = ctx->DrawBuffer->Attachment[b].Renderbuffer;
 444             struct st_renderbuffer *strb = st_renderbuffer(rb);
 445             int colormask_index = ctx->Extensions.EXT_draw_buffers2 ? i : 0;
 446
 447             if (!strb || !strb->surface)
 448                continue;
 449
 450             unsigned colormask =
 451                GET_COLORMASK(ctx->Color.ColorMask, colormask_index);
 452
 453             if (!colormask)
 454                continue;
 455
 456             unsigned surf_colormask =
 457                util_format_colormask(util_format_description(strb->surface->format));
 458
 459             if (is_scissor_enabled(ctx, rb) ||
 460                 is_window_rectangle_enabled(ctx) ||
 461                 ((colormask & surf_colormask) != surf_colormask))
 462                quad_buffers |= PIPE_CLEAR_COLOR0 << i;
 463             else
 464                clear_buffers |= PIPE_CLEAR_COLOR0 << i;
 465          }
 466       }
 467    }
 468
 469    if (mask & BUFFER_BIT_DEPTH) {
 470       struct st_renderbuffer *strb = st_renderbuffer(depthRb);
 471
 472       if (strb->surface && ctx->Depth.Mask) {
 473          if (is_scissor_enabled(ctx, depthRb) ||
 474              is_window_rectangle_enabled(ctx))
 475             quad_buffers |= PIPE_CLEAR_DEPTH;
 476          else
 477             clear_buffers |= PIPE_CLEAR_DEPTH;
 478       }
 479    }
 480    if (mask & BUFFER_BIT_STENCIL) {
 481       struct st_renderbuffer *strb = st_renderbuffer(stencilRb);
 482
 483       if (strb->surface && !is_stencil_disabled(ctx, stencilRb)) {
 484          if (is_scissor_enabled(ctx, stencilRb) ||
 485              is_window_rectangle_enabled(ctx) ||
 486              is_stencil_masked(ctx, stencilRb))
 487             quad_buffers |= PIPE_CLEAR_STENCIL;
 488          else
 489             clear_buffers |= PIPE_CLEAR_STENCIL;
 490       }
 491    }
 492
 493    /* Always clear depth and stencil together.
 494     * This can only happen when the stencil writemask is not a full mask.
 495     */
 496    if (quad_buffers & PIPE_CLEAR_DEPTHSTENCIL &&
 497        clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) {
 498       quad_buffers |= clear_buffers & PIPE_CLEAR_DEPTHSTENCIL;
 499       clear_buffers &= ~PIPE_CLEAR_DEPTHSTENCIL;
 500    }
 501
 502    /* Only use quad-based clearing for the renderbuffers which cannot
 503     * use pipe->clear. We want to always use pipe->clear for the other
 504     * renderbuffers, because it's likely to be faster.
 505     */
 506    if (clear_buffers) {
 507       /* We can't translate the clear color to the colorbuffer format,
 508        * because different colorbuffers may have different formats.
 509        */
 510       st->pipe->clear(st->pipe, clear_buffers,
 511                       (union pipe_color_union*)&ctx->Color.ClearColor,
 512                       ctx->Depth.Clear, ctx->Stencil.Clear);
 513    }
 514    if (quad_buffers) {
 515       clear_with_quad(ctx, quad_buffers);
 516    }
 517    if (mask & BUFFER_BIT_ACCUM)
 518       _mesa_clear_accum_buffer(ctx);
 519 }
 520
 521
 522 void
 523 st_init_clear_functions(struct dd_function_table *functions)
 524 {
 525    functions->Clear = st_Clear;
 526 }