src/mesa/state_tracker/st_cb_clear.c

   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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   *   Brian Paul
  32   */
  33
  34 #include "main/glheader.h"
  35 #include "main/macros.h"
  36 #include "shader/prog_instruction.h"
  37 #include "st_context.h"
  38 #include "st_atom.h"
  39 #include "st_cb_accum.h"
  40 #include "st_cb_clear.h"
  41 #include "st_cb_fbo.h"
  42 #include "st_draw.h"
  43 #include "st_program.h"
  44 #include "st_public.h"
  45 #include "st_mesa_to_tgsi.h"
  46
  47 #include "pipe/p_context.h"
  48 #include "pipe/p_inlines.h"
  49 #include "pipe/p_state.h"
  50 #include "pipe/p_defines.h"
  51 #include "util/u_pack_color.h"
  52 #include "util/u_simple_shaders.h"
  53 #include "util/u_draw_quad.h"
  54
  55 #include "cso_cache/cso_context.h"
  56
  57
  58 void
  59 st_init_clear(struct st_context *st)
  60 {
  61    struct pipe_context *pipe = st->pipe;
  62
  63    /* rasterizer state: bypass clipping */
  64    memset(&st->clear.raster, 0, sizeof(st->clear.raster));
  65    st->clear.raster.gl_rasterization_rules = 1;
  66    st->clear.raster.bypass_clipping = 1;
  67
  68    /* viewport state: identity since we're drawing in window coords */
  69    st->clear.viewport.scale[0] = 1.0;
  70    st->clear.viewport.scale[1] = 1.0;
  71    st->clear.viewport.scale[2] = 1.0;
  72    st->clear.viewport.scale[3] = 1.0;
  73    st->clear.viewport.translate[0] = 0.0;
  74    st->clear.viewport.translate[1] = 0.0;
  75    st->clear.viewport.translate[2] = 0.0;
  76    st->clear.viewport.translate[3] = 0.0;
  77
  78    /* fragment shader state: color pass-through program */
  79    st->clear.fs =
  80       util_make_fragment_passthrough_shader(pipe, &st->clear.frag_shader);
  81
  82    /* vertex shader state: color/position pass-through */
  83    {
  84       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
  85                                       TGSI_SEMANTIC_COLOR };
  86       const uint semantic_indexes[] = { 0, 0 };
  87       st->clear.vs = util_make_vertex_passthrough_shader(pipe, 2,
  88                                                          semantic_names,
  89                                                          semantic_indexes,
  90                                                          &st->clear.vert_shader);
  91    }
  92 }
  93
  94
  95 void
  96 st_destroy_clear(struct st_context *st)
  97 {
  98    struct pipe_context *pipe = st->pipe;
  99
 100    if (st->clear.fs) {
 101       cso_delete_fragment_shader(st->cso_context, st->clear.fs);
 102       st->clear.fs = NULL;
 103    }
 104    if (st->clear.vs) {
 105       cso_delete_vertex_shader(st->cso_context, st->clear.vs);
 106       st->clear.vs = NULL;
 107    }
 108    if (st->clear.vbuf) {
 109       pipe_buffer_destroy(pipe, st->clear.vbuf);
 110       st->clear.vbuf = NULL;
 111    }
 112 }
 113
 114
 115 static GLboolean
 116 is_depth_stencil_format(enum pipe_format pipeFormat)
 117 {
 118    switch (pipeFormat) {
 119    case PIPE_FORMAT_S8Z24_UNORM:
 120    case PIPE_FORMAT_Z24S8_UNORM:
 121       return GL_TRUE;
 122    default:
 123       return GL_FALSE;
 124    }
 125 }
 126
 127
 128
 129 /**
 130  * Draw a screen-aligned quadrilateral.
 131  * Coords are window coords with y=0=bottom.  These coords will be transformed
 132  * by the vertex shader and viewport transform (which will flip Y if needed).
 133  */
 134 static void
 135 draw_quad(GLcontext *ctx,
 136           float x0, float y0, float x1, float y1, GLfloat z,
 137           const GLfloat color[4])
 138 {
 139    struct st_context *st = ctx->st;
 140    struct pipe_context *pipe = st->pipe;
 141    GLuint i;
 142    void *buf;
 143
 144    if (!st->clear.vbuf) {
 145       st->clear.vbuf = pipe_buffer_create(pipe, 32, PIPE_BUFFER_USAGE_VERTEX,
 146                                           sizeof(st->clear.vertices));
 147    }
 148
 149    /* positions */
 150    st->clear.vertices[0][0][0] = x0;
 151    st->clear.vertices[0][0][1] = y0;
 152
 153    st->clear.vertices[1][0][0] = x1;
 154    st->clear.vertices[1][0][1] = y0;
 155
 156    st->clear.vertices[2][0][0] = x1;
 157    st->clear.vertices[2][0][1] = y1;
 158
 159    st->clear.vertices[3][0][0] = x0;
 160    st->clear.vertices[3][0][1] = y1;
 161
 162    /* same for all verts: */
 163    for (i = 0; i < 4; i++) {
 164       st->clear.vertices[i][0][2] = z;
 165       st->clear.vertices[i][0][3] = 1.0;
 166       st->clear.vertices[i][1][0] = color[0];
 167       st->clear.vertices[i][1][1] = color[1];
 168       st->clear.vertices[i][1][2] = color[2];
 169       st->clear.vertices[i][1][3] = color[3];
 170    }
 171
 172    /* put vertex data into vbuf */
 173    buf = pipe_buffer_map(pipe, st->clear.vbuf, PIPE_BUFFER_USAGE_CPU_WRITE);
 174    memcpy(buf, st->clear.vertices, sizeof(st->clear.vertices));
 175    pipe_buffer_unmap(pipe, st->clear.vbuf);
 176
 177    /* draw */
 178    util_draw_vertex_buffer(pipe, st->clear.vbuf,
 179                            PIPE_PRIM_TRIANGLE_FAN,
 180                            4,  /* verts */
 181                            2); /* attribs/vert */
 182 }
 183
 184
 185
 186 /**
 187  * Do glClear by drawing a quadrilateral.
 188  * The vertices of the quad will be computed from the
 189  * ctx->DrawBuffer->_X/Ymin/max fields.
 190  */
 191 static void
 192 clear_with_quad(GLcontext *ctx,
 193                 GLboolean color, GLboolean depth, GLboolean stencil)
 194 {
 195    struct st_context *st = ctx->st;
 196    const GLfloat x0 = ctx->DrawBuffer->_Xmin;
 197    const GLfloat x1 = ctx->DrawBuffer->_Xmax;
 198    GLfloat y0, y1;
 199
 200    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 201       y0 = ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymax;
 202       y1 = ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymin;
 203    }
 204    else {
 205       y0 = ctx->DrawBuffer->_Ymin;
 206       y1 = ctx->DrawBuffer->_Ymax;
 207    }
 208
 209    /*
 210    printf("%s %s%s%s %f,%f %f,%f\n", __FUNCTION__,
 211           color ? "color, " : "",
 212           depth ? "depth, " : "",
 213           stencil ? "stencil" : "",
 214           x0, y0,
 215           x1, y1);
 216    */
 217
 218    cso_save_blend(st->cso_context);
 219    cso_save_depth_stencil_alpha(st->cso_context);
 220    cso_save_rasterizer(st->cso_context);
 221    cso_save_viewport(st->cso_context);
 222    cso_save_fragment_shader(st->cso_context);
 223    cso_save_vertex_shader(st->cso_context);
 224
 225    /* blend state: RGBA masking */
 226    {
 227       struct pipe_blend_state blend;
 228       memset(&blend, 0, sizeof(blend));
 229       blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 230       blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 231       blend.rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
 232       blend.alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 233       if (color) {
 234          if (ctx->Color.ColorMask[0])
 235             blend.colormask |= PIPE_MASK_R;
 236          if (ctx->Color.ColorMask[1])
 237             blend.colormask |= PIPE_MASK_G;
 238          if (ctx->Color.ColorMask[2])
 239             blend.colormask |= PIPE_MASK_B;
 240          if (ctx->Color.ColorMask[3])
 241             blend.colormask |= PIPE_MASK_A;
 242          if (st->ctx->Color.DitherFlag)
 243             blend.dither = 1;
 244       }
 245       cso_set_blend(st->cso_context, &blend);
 246    }
 247
 248    /* depth_stencil state: always pass/set to ref value */
 249    {
 250       struct pipe_depth_stencil_alpha_state depth_stencil;
 251       memset(&depth_stencil, 0, sizeof(depth_stencil));
 252       if (depth) {
 253          depth_stencil.depth.enabled = 1;
 254          depth_stencil.depth.writemask = 1;
 255          depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
 256       }
 257
 258       if (stencil) {
 259          depth_stencil.stencil[0].enabled = 1;
 260          depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
 261          depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
 262          depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
 263          depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
 264          depth_stencil.stencil[0].ref_value = ctx->Stencil.Clear;
 265          depth_stencil.stencil[0].value_mask = 0xff;
 266          depth_stencil.stencil[0].write_mask = ctx->Stencil.WriteMask[0] & 0xff;
 267       }
 268
 269       cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
 270    }
 271
 272    cso_set_rasterizer(st->cso_context, &st->clear.raster);
 273    cso_set_viewport(st->cso_context, &st->clear.viewport);
 274
 275    cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
 276    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
 277
 278    /* draw quad matching scissor rect (XXX verify coord round-off) */
 279    draw_quad(ctx, x0, y0, x1, y1, ctx->Depth.Clear, ctx->Color.ClearColor);
 280
 281    /* Restore pipe state */
 282    cso_restore_blend(st->cso_context);
 283    cso_restore_depth_stencil_alpha(st->cso_context);
 284    cso_restore_rasterizer(st->cso_context);
 285    cso_restore_viewport(st->cso_context);
 286    cso_restore_fragment_shader(st->cso_context);
 287    cso_restore_vertex_shader(st->cso_context);
 288 }
 289
 290
 291 /**
 292  * Determine if we need to clear the depth buffer by drawing a quad.
 293  */
 294 static INLINE GLboolean
 295 check_clear_color_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 296 {
 297    const struct st_renderbuffer *strb = st_renderbuffer(rb);
 298
 299    if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
 300       return FALSE;
 301
 302    if (ctx->Scissor.Enabled)
 303       return TRUE;
 304
 305    if (!ctx->Color.ColorMask[0] ||
 306        !ctx->Color.ColorMask[1] ||
 307        !ctx->Color.ColorMask[2] ||
 308        !ctx->Color.ColorMask[3])
 309       return TRUE;
 310
 311    return FALSE;
 312 }
 313
 314
 315 static INLINE GLboolean
 316 check_clear_depth_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 317 {
 318    const struct st_renderbuffer *strb = st_renderbuffer(rb);
 319    const GLuint stencilMax = (1 << rb->StencilBits) - 1;
 320    GLboolean maskStencil
 321       = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 322
 323    if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
 324       return FALSE;
 325
 326    if (ctx->Scissor.Enabled)
 327       return TRUE;
 328
 329    if (maskStencil)
 330       return TRUE;
 331
 332    return FALSE;
 333 }
 334
 335
 336 /**
 337  * Determine if we need to clear the depth buffer by drawing a quad.
 338  */
 339 static INLINE GLboolean
 340 check_clear_depth_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 341 {
 342    const struct st_renderbuffer *strb = st_renderbuffer(rb);
 343    const GLboolean isDS = is_depth_stencil_format(strb->surface->format);
 344
 345    if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
 346       return FALSE;
 347
 348    if (ctx->Scissor.Enabled)
 349       return TRUE;
 350
 351    if (isDS &&
 352        strb->surface->status == PIPE_SURFACE_STATUS_DEFINED &&
 353        ctx->DrawBuffer->Visual.stencilBits > 0)
 354       return TRUE;
 355
 356    return FALSE;
 357 }
 358
 359
 360 /**
 361  * Determine if we need to clear the stencil buffer by drawing a quad.
 362  */
 363 static INLINE GLboolean
 364 check_clear_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 365 {
 366    const struct st_renderbuffer *strb = st_renderbuffer(rb);
 367    const GLboolean isDS = is_depth_stencil_format(strb->surface->format);
 368    const GLuint stencilMax = (1 << rb->StencilBits) - 1;
 369    const GLboolean maskStencil
 370       = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 371
 372    if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
 373       return FALSE;
 374
 375    if (maskStencil)
 376       return TRUE;
 377
 378    if (ctx->Scissor.Enabled)
 379       return TRUE;
 380
 381    /* This is correct, but it is necessary to look at the depth clear
 382     * value held in the surface when it comes time to issue the clear,
 383     * rather than taking depth and stencil clear values from the
 384     * current state.
 385     */
 386    if (isDS &&
 387        strb->surface->status == PIPE_SURFACE_STATUS_DEFINED &&
 388        ctx->DrawBuffer->Visual.depthBits > 0)
 389       return TRUE;
 390
 391    return FALSE;
 392 }
 393
 394
 395
 396 static void
 397 clear_color_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
 398 {
 399    if (check_clear_color_with_quad( ctx, rb )) {
 400       /* masking or scissoring */
 401       clear_with_quad(ctx, GL_TRUE, GL_FALSE, GL_FALSE);
 402    }
 403    else {
 404       /* clear whole buffer w/out masking */
 405       struct st_renderbuffer *strb = st_renderbuffer(rb);
 406       uint clearValue;
 407       util_pack_color(ctx->Color.ClearColor, PIPE_FORMAT_A8R8G8B8_UNORM, &clearValue);
 408       ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
 409    }
 410 }
 411
 412
 413 static void
 414 clear_depth_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
 415 {
 416    if (check_clear_depth_with_quad(ctx, rb)) {
 417       /* scissoring or we have a combined depth/stencil buffer */
 418       clear_with_quad(ctx, GL_FALSE, GL_TRUE, GL_FALSE);
 419    }
 420    else {
 421       struct st_renderbuffer *strb = st_renderbuffer(rb);
 422
 423       /* simple clear of whole buffer */
 424       uint clearValue = util_pack_z(strb->surface->format, ctx->Depth.Clear);
 425       ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
 426    }
 427 }
 428
 429
 430 static void
 431 clear_stencil_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
 432 {
 433    if (check_clear_stencil_with_quad(ctx, rb)) {
 434       /* masking or scissoring or combined depth/stencil buffer */
 435       clear_with_quad(ctx, GL_FALSE, GL_FALSE, GL_TRUE);
 436    }
 437    else {
 438       struct st_renderbuffer *strb = st_renderbuffer(rb);
 439
 440       /* simple clear of whole buffer */
 441       GLuint clearValue = ctx->Stencil.Clear;
 442
 443       switch (strb->surface->format) {
 444       case PIPE_FORMAT_S8Z24_UNORM:
 445          clearValue <<= 24;
 446          break;
 447       default:
 448          ; /* no-op, stencil value is in least significant bits */
 449       }
 450
 451       ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
 452    }
 453 }
 454
 455
 456 static void
 457 clear_depth_stencil_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
 458 {
 459
 460    if (check_clear_depth_stencil_with_quad(ctx, rb)) {
 461       /* masking or scissoring */
 462       clear_with_quad(ctx, GL_FALSE, GL_TRUE, GL_TRUE);
 463    }
 464    else {
 465       struct st_renderbuffer *strb = st_renderbuffer(rb);
 466
 467       /* clear whole buffer w/out masking */
 468       GLuint clearValue = util_pack_z(strb->surface->format, ctx->Depth.Clear);
 469
 470       switch (strb->surface->format) {
 471       case PIPE_FORMAT_S8Z24_UNORM:
 472          clearValue |= ctx->Stencil.Clear << 24;
 473          break;
 474       case PIPE_FORMAT_Z24S8_UNORM:
 475          clearValue |= ctx->Stencil.Clear;
 476          break;
 477       default:
 478          assert(0);
 479       }
 480
 481       ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
 482    }
 483 }
 484
 485
 486
 487 /**
 488  * Called via ctx->Driver.Clear()
 489  * XXX: doesn't pick up the differences between front/back/left/right
 490  * clears.  Need to sort that out...
 491  */
 492 static void st_clear(GLcontext *ctx, GLbitfield mask)
 493 {
 494    static const GLbitfield BUFFER_BITS_DS
 495       = (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
 496    struct st_context *st = ctx->st;
 497    struct gl_renderbuffer *depthRb
 498       = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 499    struct gl_renderbuffer *stencilRb
 500       = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 501    GLbitfield cmask = mask & BUFFER_BITS_COLOR;
 502
 503    /* This makes sure the softpipe has the latest scissor, etc values */
 504    st_validate_state( st );
 505
 506    /*
 507     * XXX TO-DO:
 508     * If we're going to use clear_with_quad() for any reason, use it to
 509     * clear as many other buffers as possible.
 510     * As it is now, we sometimes call clear_with_quad() three times to clear
 511     * color/depth/stencil individually...
 512     */
 513
 514    if (cmask) {
 515       GLuint b;
 516       for (b = 0; cmask; b++) {
 517          if (cmask & (1 << b)) {
 518             struct gl_renderbuffer *rb
 519                = ctx->DrawBuffer->Attachment[b].Renderbuffer;
 520             assert(rb);
 521             clear_color_buffer(ctx, rb);
 522             cmask &= ~(1 << b); /* turn off bit */
 523          }
 524          assert(b < BUFFER_COUNT);
 525       }
 526    }
 527
 528    if (mask & BUFFER_BIT_ACCUM) {
 529       st_clear_accum_buffer(ctx,
 530                        ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 531    }
 532
 533    if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
 534       /* clearing combined depth + stencil */
 535       clear_depth_stencil_buffer(ctx, depthRb);
 536    }
 537    else {
 538       /* separate depth/stencil clears */
 539       if (mask & BUFFER_BIT_DEPTH) {
 540          clear_depth_buffer(ctx, depthRb);
 541       }
 542       if (mask & BUFFER_BIT_STENCIL) {
 543          clear_stencil_buffer(ctx, stencilRb);
 544       }
 545    }
 546 }
 547
 548
 549 void st_init_clear_functions(struct dd_function_table *functions)
 550 {
 551    functions->Clear = st_clear;
 552 }