src/mesa/state_tracker/st_cb_clear.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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 <keith@tungstengraphics.com>
  32   *   Brian Paul
  33   *   Michel Dänzer
  34   */
  35
  36 #include "main/glheader.h"
  37 #include "main/formats.h"
  38 #include "main/macros.h"
  39 #include "shader/prog_instruction.h"
  40 #include "st_context.h"
  41 #include "st_atom.h"
  42 #include "st_cb_accum.h"
  43 #include "st_cb_clear.h"
  44 #include "st_cb_fbo.h"
  45 #include "st_program.h"
  46 #include "st_inlines.h"
  47
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_state.h"
  50 #include "pipe/p_defines.h"
  51 #include "util/u_format.h"
  52 #include "util/u_inlines.h"
  53 #include "util/u_simple_shaders.h"
  54 #include "util/u_draw_quad.h"
  55
  56 #include "cso_cache/cso_context.h"
  57
  58
  59 /**
  60  * Do per-context initialization for glClear.
  61  */
  62 void
  63 st_init_clear(struct st_context *st)
  64 {
  65    struct pipe_context *pipe = st->pipe;
  66
  67    memset(&st->clear, 0, sizeof(st->clear));
  68
  69    st->clear.raster.gl_rasterization_rules = 1;
  70
  71    /* fragment shader state: color pass-through program */
  72    st->clear.fs = util_make_fragment_passthrough_shader(pipe);
  73
  74    /* vertex shader state: color/position pass-through */
  75    {
  76       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
  77                                       TGSI_SEMANTIC_COLOR };
  78       const uint semantic_indexes[] = { 0, 0 };
  79       st->clear.vs = util_make_vertex_passthrough_shader(pipe, 2,
  80                                                          semantic_names,
  81                                                          semantic_indexes);
  82    }
  83 }
  84
  85
  86 /**
  87  * Free per-context state for glClear.
  88  */
  89 void
  90 st_destroy_clear(struct st_context *st)
  91 {
  92    if (st->clear.fs) {
  93       cso_delete_fragment_shader(st->cso_context, st->clear.fs);
  94       st->clear.fs = NULL;
  95    }
  96    if (st->clear.vs) {
  97       cso_delete_vertex_shader(st->cso_context, st->clear.vs);
  98       st->clear.vs = NULL;
  99    }
 100    if (st->clear.vbuf) {
 101       pipe_resource_reference(&st->clear.vbuf, NULL);
 102       st->clear.vbuf = NULL;
 103    }
 104 }
 105
 106
 107 /**
 108  * Draw a screen-aligned quadrilateral.
 109  * Coords are clip coords with y=0=bottom.
 110  */
 111 static void
 112 draw_quad(GLcontext *ctx,
 113           float x0, float y0, float x1, float y1, GLfloat z,
 114           const GLfloat color[4])
 115 {
 116    struct st_context *st = ctx->st;
 117    struct pipe_context *pipe = st->pipe;
 118
 119    /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
 120     * no_flush) updates to buffers where we know there is no conflict
 121     * with previous data.  Currently using max_slots > 1 will cause
 122     * synchronous rendering if the driver flushes its command buffers
 123     * between one bitmap and the next.  Our flush hook below isn't
 124     * sufficient to catch this as the driver doesn't tell us when it
 125     * flushes its own command buffers.  Until this gets fixed, pay the
 126     * price of allocating a new buffer for each bitmap cache-flush to
 127     * avoid synchronous rendering.
 128     */
 129    const GLuint max_slots = 1; /* 1024 / sizeof(st->clear.vertices); */
 130    GLuint i;
 131
 132    if (st->clear.vbuf_slot >= max_slots) {
 133       pipe_resource_reference(&st->clear.vbuf, NULL);
 134       st->clear.vbuf_slot = 0;
 135    }
 136
 137    if (!st->clear.vbuf) {
 138       st->clear.vbuf = pipe_buffer_create(pipe->screen,
 139                                           PIPE_BIND_VERTEX_BUFFER,
 140                                           max_slots * sizeof(st->clear.vertices));
 141    }
 142
 143    /* positions */
 144    st->clear.vertices[0][0][0] = x0;
 145    st->clear.vertices[0][0][1] = y0;
 146
 147    st->clear.vertices[1][0][0] = x1;
 148    st->clear.vertices[1][0][1] = y0;
 149
 150    st->clear.vertices[2][0][0] = x1;
 151    st->clear.vertices[2][0][1] = y1;
 152
 153    st->clear.vertices[3][0][0] = x0;
 154    st->clear.vertices[3][0][1] = y1;
 155
 156    /* same for all verts: */
 157    for (i = 0; i < 4; i++) {
 158       st->clear.vertices[i][0][2] = z;
 159       st->clear.vertices[i][0][3] = 1.0;
 160       st->clear.vertices[i][1][0] = color[0];
 161       st->clear.vertices[i][1][1] = color[1];
 162       st->clear.vertices[i][1][2] = color[2];
 163       st->clear.vertices[i][1][3] = color[3];
 164    }
 165
 166    /* put vertex data into vbuf */
 167    st_no_flush_pipe_buffer_write_nooverlap(st, st->clear.vbuf,
 168                                            st->clear.vbuf_slot
 169                                              * sizeof(st->clear.vertices),
 170                                            sizeof(st->clear.vertices),
 171                                            st->clear.vertices);
 172
 173    /* draw */
 174    util_draw_vertex_buffer(pipe,
 175                            st->clear.vbuf,
 176                            st->clear.vbuf_slot * sizeof(st->clear.vertices),
 177                            PIPE_PRIM_TRIANGLE_FAN,
 178                            4,  /* verts */
 179                            2); /* attribs/vert */
 180
 181    /* Increment slot */
 182    st->clear.vbuf_slot++;
 183 }
 184
 185
 186
 187 /**
 188  * Do glClear by drawing a quadrilateral.
 189  * The vertices of the quad will be computed from the
 190  * ctx->DrawBuffer->_X/Ymin/max fields.
 191  */
 192 static void
 193 clear_with_quad(GLcontext *ctx,
 194                 GLboolean color, GLboolean depth, GLboolean stencil)
 195 {
 196    struct st_context *st = ctx->st;
 197    const struct gl_framebuffer *fb = ctx->DrawBuffer;
 198    const GLfloat fb_width = (GLfloat) fb->Width;
 199    const GLfloat fb_height = (GLfloat) fb->Height;
 200    const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin / fb_width * 2.0f - 1.0f;
 201    const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax / fb_width * 2.0f - 1.0f;
 202    const GLfloat y0 = (GLfloat) ctx->DrawBuffer->_Ymin / fb_height * 2.0f - 1.0f;
 203    const GLfloat y1 = (GLfloat) ctx->DrawBuffer->_Ymax / fb_height * 2.0f - 1.0f;
 204
 205    /*
 206    printf("%s %s%s%s %f,%f %f,%f\n", __FUNCTION__,
 207           color ? "color, " : "",
 208           depth ? "depth, " : "",
 209           stencil ? "stencil" : "",
 210           x0, y0,
 211           x1, y1);
 212    */
 213
 214    cso_save_blend(st->cso_context);
 215    cso_save_stencil_ref(st->cso_context);
 216    cso_save_depth_stencil_alpha(st->cso_context);
 217    cso_save_rasterizer(st->cso_context);
 218    cso_save_viewport(st->cso_context);
 219    cso_save_clip(st->cso_context);
 220    cso_save_fragment_shader(st->cso_context);
 221    cso_save_vertex_shader(st->cso_context);
 222    cso_save_vertex_elements(st->cso_context);
 223
 224    /* blend state: RGBA masking */
 225    {
 226       struct pipe_blend_state blend;
 227       memset(&blend, 0, sizeof(blend));
 228       blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 229       blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 230       blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
 231       blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 232       if (color) {
 233          if (ctx->Color.ColorMask[0][0])
 234             blend.rt[0].colormask |= PIPE_MASK_R;
 235          if (ctx->Color.ColorMask[0][1])
 236             blend.rt[0].colormask |= PIPE_MASK_G;
 237          if (ctx->Color.ColorMask[0][2])
 238             blend.rt[0].colormask |= PIPE_MASK_B;
 239          if (ctx->Color.ColorMask[0][3])
 240             blend.rt[0].colormask |= PIPE_MASK_A;
 241          if (st->ctx->Color.DitherFlag)
 242             blend.dither = 1;
 243       }
 244       cso_set_blend(st->cso_context, &blend);
 245    }
 246
 247    /* depth_stencil state: always pass/set to ref value */
 248    {
 249       struct pipe_depth_stencil_alpha_state depth_stencil;
 250       memset(&depth_stencil, 0, sizeof(depth_stencil));
 251       if (depth) {
 252          depth_stencil.depth.enabled = 1;
 253          depth_stencil.depth.writemask = 1;
 254          depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
 255       }
 256
 257       if (stencil) {
 258          struct pipe_stencil_ref stencil_ref;
 259          memset(&stencil_ref, 0, sizeof(stencil_ref));
 260          depth_stencil.stencil[0].enabled = 1;
 261          depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
 262          depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
 263          depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
 264          depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
 265          depth_stencil.stencil[0].valuemask = 0xff;
 266          depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
 267          stencil_ref.ref_value[0] = ctx->Stencil.Clear;
 268          cso_set_stencil_ref(st->cso_context, &stencil_ref);
 269       }
 270
 271       cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
 272    }
 273
 274    cso_set_vertex_elements(st->cso_context, 2, st->velems_util_draw);
 275
 276    cso_set_rasterizer(st->cso_context, &st->clear.raster);
 277
 278    /* viewport state: viewport matching window dims */
 279    {
 280       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 281       struct pipe_viewport_state vp;
 282       vp.scale[0] = 0.5f * fb_width;
 283       vp.scale[1] = fb_height * (invert ? -0.5f : 0.5f);
 284       vp.scale[2] = 1.0f;
 285       vp.scale[3] = 1.0f;
 286       vp.translate[0] = 0.5f * fb_width;
 287       vp.translate[1] = 0.5f * fb_height;
 288       vp.translate[2] = 0.0f;
 289       vp.translate[3] = 0.0f;
 290       cso_set_viewport(st->cso_context, &vp);
 291    }
 292
 293    cso_set_clip(st->cso_context, &st->clear.clip);
 294    cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
 295    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
 296
 297    /* draw quad matching scissor rect (XXX verify coord round-off) */
 298    draw_quad(ctx, x0, y0, x1, y1,
 299              (GLfloat) ctx->Depth.Clear, ctx->Color.ClearColor);
 300
 301    /* Restore pipe state */
 302    cso_restore_blend(st->cso_context);
 303    cso_restore_stencil_ref(st->cso_context);
 304    cso_restore_depth_stencil_alpha(st->cso_context);
 305    cso_restore_rasterizer(st->cso_context);
 306    cso_restore_viewport(st->cso_context);
 307    cso_restore_clip(st->cso_context);
 308    cso_restore_fragment_shader(st->cso_context);
 309    cso_restore_vertex_shader(st->cso_context);
 310    cso_restore_vertex_elements(st->cso_context);
 311 }
 312
 313
 314 /**
 315  * Determine if we need to clear the depth buffer by drawing a quad.
 316  */
 317 static INLINE GLboolean
 318 check_clear_color_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 319 {
 320    if (ctx->Scissor.Enabled &&
 321        (ctx->Scissor.X != 0 ||
 322         ctx->Scissor.Y != 0 ||
 323         ctx->Scissor.Width < rb->Width ||
 324         ctx->Scissor.Height < rb->Height))
 325       return GL_TRUE;
 326
 327    if (!ctx->Color.ColorMask[0][0] ||
 328        !ctx->Color.ColorMask[0][1] ||
 329        !ctx->Color.ColorMask[0][2] ||
 330        !ctx->Color.ColorMask[0][3])
 331       return GL_TRUE;
 332
 333    return GL_FALSE;
 334 }
 335
 336
 337 /**
 338  * Determine if we need to clear the combiend depth/stencil buffer by
 339  * drawing a quad.
 340  */
 341 static INLINE GLboolean
 342 check_clear_depth_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 343 {
 344    const GLuint stencilMax = 0xff;
 345    GLboolean maskStencil
 346       = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 347
 348    assert(rb->Format == MESA_FORMAT_S8 ||
 349           rb->Format == MESA_FORMAT_Z24_S8 ||
 350           rb->Format == MESA_FORMAT_S8_Z24);
 351
 352    if (ctx->Scissor.Enabled &&
 353        (ctx->Scissor.X != 0 ||
 354         ctx->Scissor.Y != 0 ||
 355         ctx->Scissor.Width < rb->Width ||
 356         ctx->Scissor.Height < rb->Height))
 357       return GL_TRUE;
 358
 359    if (maskStencil)
 360       return GL_TRUE;
 361
 362    return GL_FALSE;
 363 }
 364
 365
 366 /**
 367  * Determine if we need to clear the depth buffer by drawing a quad.
 368  */
 369 static INLINE GLboolean
 370 check_clear_depth_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 371 {
 372    const struct st_renderbuffer *strb = st_renderbuffer(rb);
 373    const GLboolean isDS = util_format_is_depth_and_stencil(strb->surface->format);
 374
 375    if (ctx->Scissor.Enabled &&
 376        (ctx->Scissor.X != 0 ||
 377         ctx->Scissor.Y != 0 ||
 378         ctx->Scissor.Width < rb->Width ||
 379         ctx->Scissor.Height < rb->Height))
 380       return GL_TRUE;
 381
 382    if (isDS && ctx->DrawBuffer->Visual.stencilBits > 0)
 383       return GL_TRUE;
 384
 385    return GL_FALSE;
 386 }
 387
 388
 389 /**
 390  * Determine if we need to clear the stencil buffer by drawing a quad.
 391  */
 392 static INLINE GLboolean
 393 check_clear_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 394 {
 395    const struct st_renderbuffer *strb = st_renderbuffer(rb);
 396    const GLboolean isDS = util_format_is_depth_and_stencil(strb->surface->format);
 397    const GLuint stencilMax = 0xff;
 398    const GLboolean maskStencil
 399       = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 400
 401    assert(rb->Format == MESA_FORMAT_S8 ||
 402           rb->Format == MESA_FORMAT_Z24_S8 ||
 403           rb->Format == MESA_FORMAT_S8_Z24);
 404
 405    if (maskStencil)
 406       return GL_TRUE;
 407
 408    if (ctx->Scissor.Enabled &&
 409        (ctx->Scissor.X != 0 ||
 410         ctx->Scissor.Y != 0 ||
 411         ctx->Scissor.Width < rb->Width ||
 412         ctx->Scissor.Height < rb->Height))
 413       return GL_TRUE;
 414
 415    /* This is correct, but it is necessary to look at the depth clear
 416     * value held in the surface when it comes time to issue the clear,
 417     * rather than taking depth and stencil clear values from the
 418     * current state.
 419     */
 420    if (isDS && ctx->DrawBuffer->Visual.depthBits > 0)
 421       return GL_TRUE;
 422
 423    return GL_FALSE;
 424 }
 425
 426
 427
 428 /**
 429  * Called when we need to flush.
 430  */
 431 void
 432 st_flush_clear(struct st_context *st)
 433 {
 434    /* Release vertex buffer to avoid synchronous rendering if we were
 435     * to map it in the next frame.
 436     */
 437    pipe_resource_reference(&st->clear.vbuf, NULL);
 438    st->clear.vbuf_slot = 0;
 439 }
 440
 441
 442
 443 /**
 444  * Called via ctx->Driver.Clear()
 445  */
 446 static void
 447 st_Clear(GLcontext *ctx, GLbitfield mask)
 448 {
 449    static const GLbitfield BUFFER_BITS_DS
 450       = (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
 451    struct st_context *st = ctx->st;
 452    struct gl_renderbuffer *depthRb
 453       = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 454    struct gl_renderbuffer *stencilRb
 455       = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 456    GLbitfield quad_buffers = 0x0;
 457    GLbitfield clear_buffers = 0x0;
 458    GLuint i;
 459
 460    /* This makes sure the pipe has the latest scissor, etc values */
 461    st_validate_state( st );
 462
 463    if (mask & BUFFER_BITS_COLOR) {
 464       for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
 465          GLuint b = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
 466
 467          if (mask & (1 << b)) {
 468             struct gl_renderbuffer *rb
 469                = ctx->DrawBuffer->Attachment[b].Renderbuffer;
 470             struct st_renderbuffer *strb;
 471
 472             assert(rb);
 473
 474             strb = st_renderbuffer(rb);
 475
 476             if (!strb->surface)
 477                continue;
 478
 479             if (check_clear_color_with_quad( ctx, rb ))
 480                quad_buffers |= PIPE_CLEAR_COLOR;
 481             else
 482                clear_buffers |= PIPE_CLEAR_COLOR;
 483          }
 484       }
 485    }
 486
 487    if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
 488       /* clearing combined depth + stencil */
 489       struct st_renderbuffer *strb = st_renderbuffer(depthRb);
 490
 491       if (strb->surface) {
 492          if (check_clear_depth_stencil_with_quad(ctx, depthRb))
 493             quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 494          else
 495             clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 496       }
 497    }
 498    else {
 499       /* separate depth/stencil clears */
 500       if (mask & BUFFER_BIT_DEPTH) {
 501          struct st_renderbuffer *strb = st_renderbuffer(depthRb);
 502
 503          if (strb->surface) {
 504             if (check_clear_depth_with_quad(ctx, depthRb))
 505                quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 506             else
 507                clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 508          }
 509       }
 510       if (mask & BUFFER_BIT_STENCIL) {
 511          struct st_renderbuffer *strb = st_renderbuffer(stencilRb);
 512
 513          if (strb->surface) {
 514             if (check_clear_stencil_with_quad(ctx, stencilRb))
 515                quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 516             else
 517                clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
 518          }
 519       }
 520    }
 521
 522    /*
 523     * If we're going to use clear_with_quad() for any reason, use it for
 524     * everything possible.
 525     */
 526    if (quad_buffers) {
 527       quad_buffers |= clear_buffers;
 528       clear_with_quad(ctx,
 529                       quad_buffers & PIPE_CLEAR_COLOR,
 530                       mask & BUFFER_BIT_DEPTH,
 531                       mask & BUFFER_BIT_STENCIL);
 532    } else if (clear_buffers)
 533       ctx->st->pipe->clear(ctx->st->pipe, clear_buffers, ctx->Color.ClearColor,
 534                            ctx->Depth.Clear, ctx->Stencil.Clear);
 535
 536    if (mask & BUFFER_BIT_ACCUM)
 537       st_clear_accum_buffer(ctx,
 538                             ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 539 }
 540
 541
 542 void
 543 st_init_clear_functions(struct dd_function_table *functions)
 544 {
 545    functions->Clear = st_Clear;
 546 }