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/glheader.h"
  37 #include "main/accum.h"
  38 #include "main/formats.h"
  39 #include "main/framebuffer.h"
  40 #include "main/macros.h"
  41 #include "main/glformats.h"
  42 #include "program/prog_instruction.h"
  43 #include "st_context.h"
  44 #include "st_atom.h"
  45 #include "st_cb_bitmap.h"
  46 #include "st_cb_clear.h"
  47 #include "st_cb_fbo.h"
  48 #include "st_draw.h"
  49 #include "st_format.h"
  50 #include "st_program.h"
  51
  52 #include "pipe/p_context.h"
  53 #include "pipe/p_shader_tokens.h"
  54 #include "pipe/p_state.h"
  55 #include "pipe/p_defines.h"
  56 #include "util/u_format.h"
  57 #include "util/u_inlines.h"
  58 #include "util/u_simple_shaders.h"
  59
  60 #include "cso_cache/cso_context.h"
  61
  62
  63 /**
  64  * Do per-context initialization for glClear.
  65  */
  66 void
  67 st_init_clear(struct st_context *st)
  68 {
  69    memset(&st->clear, 0, sizeof(st->clear));
  70
  71    st->clear.raster.half_pixel_center = 1;
  72    st->clear.raster.bottom_edge_rule = 1;
  73    st->clear.raster.depth_clip = 1;
  74 }
  75
  76
  77 /**
  78  * Free per-context state for glClear.
  79  */
  80 void
  81 st_destroy_clear(struct st_context *st)
  82 {
  83    if (st->clear.fs) {
  84       cso_delete_fragment_shader(st->cso_context, st->clear.fs);
  85       st->clear.fs = NULL;
  86    }
  87    if (st->clear.vs) {
  88       cso_delete_vertex_shader(st->cso_context, st->clear.vs);
  89       st->clear.vs = NULL;
  90    }
  91    if (st->clear.vs_layered) {
  92       cso_delete_vertex_shader(st->cso_context, st->clear.vs_layered);
  93       st->clear.vs_layered = NULL;
  94    }
  95    if (st->clear.gs_layered) {
  96       cso_delete_geometry_shader(st->cso_context, st->clear.gs_layered);
  97       st->clear.gs_layered = NULL;
  98    }
  99 }
 100
 101
 102 /**
 103  * Helper function to set the fragment shaders.
 104  */
 105 static inline void
 106 set_fragment_shader(struct st_context *st)
 107 {
 108    if (!st->clear.fs)
 109       st->clear.fs =
 110          util_make_fragment_passthrough_shader(st->pipe, TGSI_SEMANTIC_GENERIC,
 111                                                TGSI_INTERPOLATE_CONSTANT,
 112                                                TRUE);
 113
 114    cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
 115 }
 116
 117
 118 /**
 119  * Helper function to set the vertex shader.
 120  */
 121 static inline void
 122 set_vertex_shader(struct st_context *st)
 123 {
 124    /* vertex shader - still required to provide the linkage between
 125     * fragment shader input semantics and vertex_element/buffers.
 126     */
 127    if (!st->clear.vs)
 128    {
 129       const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
 130                                       TGSI_SEMANTIC_GENERIC };
 131       const uint semantic_indexes[] = { 0, 0 };
 132       st->clear.vs = util_make_vertex_passthrough_shader(st->pipe, 2,
 133                                                          semantic_names,
 134                                                          semantic_indexes,
 135                                                          FALSE);
 136    }
 137
 138    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
 139    cso_set_geometry_shader_handle(st->cso_context, NULL);
 140 }
 141
 142
 143 static void
 144 set_vertex_shader_layered(struct st_context *st)
 145 {
 146    struct pipe_context *pipe = st->pipe;
 147
 148    if (!pipe->screen->get_param(pipe->screen, PIPE_CAP_TGSI_INSTANCEID)) {
 149       assert(!"Got layered clear, but VS instancing is unsupported");
 150       set_vertex_shader(st);
 151       return;
 152    }
 153
 154    if (!st->clear.vs_layered) {
 155       bool vs_layer =
 156          pipe->screen->get_param(pipe->screen, PIPE_CAP_TGSI_VS_LAYER_VIEWPORT);
 157       if (vs_layer) {
 158          st->clear.vs_layered = util_make_layered_clear_vertex_shader(pipe);
 159       } else {
 160          st->clear.vs_layered = util_make_layered_clear_helper_vertex_shader(pipe);
 161          st->clear.gs_layered = util_make_layered_clear_geometry_shader(pipe);
 162       }
 163    }
 164
 165    cso_set_vertex_shader_handle(st->cso_context, st->clear.vs_layered);
 166    cso_set_geometry_shader_handle(st->cso_context, st->clear.gs_layered);
 167 }
 168
 169
 170 /**
 171  * Do glClear by drawing a quadrilateral.
 172  * The vertices of the quad will be computed from the
 173  * ctx->DrawBuffer->_X/Ymin/max fields.
 174  */
 175 static void
 176 clear_with_quad(struct gl_context *ctx, unsigned clear_buffers)
 177 {
 178    struct st_context *st = st_context(ctx);
 179    struct cso_context *cso = st->cso_context;
 180    const struct gl_framebuffer *fb = ctx->DrawBuffer;
 181    const GLfloat fb_width = (GLfloat) fb->Width;
 182    const GLfloat fb_height = (GLfloat) fb->Height;
 183
 184    _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
 185
 186    const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin / fb_width * 2.0f - 1.0f;
 187    const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax / fb_width * 2.0f - 1.0f;
 188    const GLfloat y0 = (GLfloat) ctx->DrawBuffer->_Ymin / fb_height * 2.0f - 1.0f;
 189    const GLfloat y1 = (GLfloat) ctx->DrawBuffer->_Ymax / fb_height * 2.0f - 1.0f;
 190    unsigned num_layers = st->state.fb_num_layers;
 191
 192    /*
 193    printf("%s %s%s%s %f,%f %f,%f\n", __func__,
 194           color ? "color, " : "",
 195           depth ? "depth, " : "",
 196           stencil ? "stencil" : "",
 197           x0, y0,
 198           x1, y1);
 199    */
 200
 201    cso_save_state(cso, (CSO_BIT_BLEND |
 202                         CSO_BIT_STENCIL_REF |
 203                         CSO_BIT_DEPTH_STENCIL_ALPHA |
 204                         CSO_BIT_RASTERIZER |
 205                         CSO_BIT_SAMPLE_MASK |
 206                         CSO_BIT_MIN_SAMPLES |
 207                         CSO_BIT_VIEWPORT |
 208                         CSO_BIT_STREAM_OUTPUTS |
 209                         CSO_BIT_VERTEX_ELEMENTS |
 210                         CSO_BIT_AUX_VERTEX_BUFFER_SLOT |
 211                         CSO_BIT_PAUSE_QUERIES |
 212                         CSO_BITS_ALL_SHADERS));
 213
 214    /* blend state: RGBA masking */
 215    {
 216       struct pipe_blend_state blend;
 217       memset(&blend, 0, sizeof(blend));
 218       if (clear_buffers & PIPE_CLEAR_COLOR) {
 219          int num_buffers = ctx->Extensions.EXT_draw_buffers2 ?
 220                            ctx->DrawBuffer->_NumColorDrawBuffers : 1;
 221          int i;
 222
 223          blend.independent_blend_enable = num_buffers > 1;
 224
 225          for (i = 0; i < num_buffers; i++) {
 226             if (!(clear_buffers & (PIPE_CLEAR_COLOR0 << i)))
 227                continue;
 228
 229             blend.rt[i].colormask = GET_COLORMASK(ctx->Color.ColorMask, i);
 230          }
 231
 232          if (ctx->Color.DitherFlag)
 233             blend.dither = 1;
 234       }
 235       cso_set_blend(cso, &blend);
 236    }
 237
 238    /* depth_stencil state: always pass/set to ref value */
 239    {
 240       struct pipe_depth_stencil_alpha_state depth_stencil;
 241       memset(&depth_stencil, 0, sizeof(depth_stencil));
 242       if (clear_buffers & PIPE_CLEAR_DEPTH) {
 243          depth_stencil.depth.enabled = 1;
 244          depth_stencil.depth.writemask = 1;
 245          depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
 246       }
 247
 248       if (clear_buffers & PIPE_CLEAR_STENCIL) {
 249          struct pipe_stencil_ref stencil_ref;
 250          memset(&stencil_ref, 0, sizeof(stencil_ref));
 251          depth_stencil.stencil[0].enabled = 1;
 252          depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
 253          depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
 254          depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
 255          depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
 256          depth_stencil.stencil[0].valuemask = 0xff;
 257          depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
 258          stencil_ref.ref_value[0] = ctx->Stencil.Clear;
 259          cso_set_stencil_ref(cso, &stencil_ref);
 260       }
 261
 262       cso_set_depth_stencil_alpha(cso, &depth_stencil);
 263    }
 264
 265    cso_set_vertex_elements(cso, 2, st->util_velems);
 266    cso_set_stream_outputs(cso, 0, NULL, NULL);
 267    cso_set_sample_mask(cso, ~0);
 268    cso_set_min_samples(cso, 1);
 269    cso_set_rasterizer(cso, &st->clear.raster);
 270
 271    /* viewport state: viewport matching window dims */
 272    cso_set_viewport_dims(st->cso_context, fb_width, fb_height,
 273                          st_fb_orientation(fb) == Y_0_TOP);
 274
 275    set_fragment_shader(st);
 276    cso_set_tessctrl_shader_handle(cso, NULL);
 277    cso_set_tesseval_shader_handle(cso, NULL);
 278
 279    if (num_layers > 1)
 280       set_vertex_shader_layered(st);
 281    else
 282       set_vertex_shader(st);
 283
 284    /* draw quad matching scissor rect.
 285     *
 286     * Note: if we're only clearing depth/stencil we still setup vertices
 287     * with color, but they'll be ignored.
 288     *
 289     * We can't translate the clear color to the colorbuffer format,
 290     * because different colorbuffers may have different formats.
 291     */
 292    if (!st_draw_quad(st, x0, y0, x1, y1,
 293                      ctx->Depth.Clear * 2.0f - 1.0f,
 294                      0.0f, 0.0f, 0.0f, 0.0f,
 295                      (const float *) &ctx->Color.ClearColor.f,
 296                      num_layers)) {
 297       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glClear");
 298    }
 299
 300    /* Restore pipe state */
 301    cso_restore_state(cso);
 302 }
 303
 304
 305 /**
 306  * Return if the scissor must be enabled during the clear.
 307  */
 308 static inline GLboolean
 309 is_scissor_enabled(struct gl_context *ctx, struct gl_renderbuffer *rb)
 310 {
 311    const struct gl_scissor_rect *scissor = &ctx->Scissor.ScissorArray[0];
 312
 313    return (ctx->Scissor.EnableFlags & 1) &&
 314           (scissor->X > 0 ||
 315            scissor->Y > 0 ||
 316            scissor->X + scissor->Width < (int)rb->Width ||
 317            scissor->Y + scissor->Height < (int)rb->Height);
 318 }
 319
 320 /**
 321  * Return if window rectangles must be enabled during the clear.
 322  */
 323 static inline bool
 324 is_window_rectangle_enabled(struct gl_context *ctx)
 325 {
 326    if (ctx->DrawBuffer == ctx->WinSysDrawBuffer)
 327       return false;
 328    return ctx->Scissor.NumWindowRects > 0 ||
 329       ctx->Scissor.WindowRectMode == GL_INCLUSIVE_EXT;
 330 }
 331
 332
 333 /**
 334  * Return if all of the stencil bits are masked.
 335  */
 336 static inline GLboolean
 337 is_stencil_disabled(struct gl_context *ctx, struct gl_renderbuffer *rb)
 338 {
 339    const GLuint stencilMax = 0xff;
 340
 341    assert(_mesa_get_format_bits(rb->Format, GL_STENCIL_BITS) > 0);
 342    return (ctx->Stencil.WriteMask[0] & stencilMax) == 0;
 343 }
 344
 345
 346 /**
 347  * Return if any of the stencil bits are masked.
 348  */
 349 static inline GLboolean
 350 is_stencil_masked(struct gl_context *ctx, struct gl_renderbuffer *rb)
 351 {
 352    const GLuint stencilMax = 0xff;
 353
 354    assert(_mesa_get_format_bits(rb->Format, GL_STENCIL_BITS) > 0);
 355    return (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 356 }
 357
 358
 359 /**
 360  * Called via ctx->Driver.Clear()
 361  */
 362 static void
 363 st_Clear(struct gl_context *ctx, GLbitfield mask)
 364 {
 365    struct st_context *st = st_context(ctx);
 366    struct gl_renderbuffer *depthRb
 367       = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
 368    struct gl_renderbuffer *stencilRb
 369       = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
 370    GLbitfield quad_buffers = 0x0;
 371    GLbitfield clear_buffers = 0x0;
 372    GLuint i;
 373
 374    st_flush_bitmap_cache(st);
 375    st_invalidate_readpix_cache(st);
 376
 377    /* This makes sure the pipe has the latest scissor, etc values */
 378    st_validate_state(st, ST_PIPELINE_CLEAR);
 379
 380    if (mask & BUFFER_BITS_COLOR) {
 381       for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
 382          gl_buffer_index b = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
 383
 384          if (b != BUFFER_NONE && mask & (1 << b)) {
 385             struct gl_renderbuffer *rb
 386                = ctx->DrawBuffer->Attachment[b].Renderbuffer;
 387             struct st_renderbuffer *strb = st_renderbuffer(rb);
 388             int colormask_index = ctx->Extensions.EXT_draw_buffers2 ? i : 0;
 389
 390             if (!strb || !strb->surface)
 391                continue;
 392
 393             if (!GET_COLORMASK(ctx->Color.ColorMask, colormask_index))
 394                continue;
 395
 396             if (is_scissor_enabled(ctx, rb) ||
 397                 is_window_rectangle_enabled(ctx) ||
 398                 GET_COLORMASK(ctx->Color.ColorMask, colormask_index) != 0xf)
 399                quad_buffers |= PIPE_CLEAR_COLOR0 << i;
 400             else
 401                clear_buffers |= PIPE_CLEAR_COLOR0 << i;
 402          }
 403       }
 404    }
 405
 406    if (mask & BUFFER_BIT_DEPTH) {
 407       struct st_renderbuffer *strb = st_renderbuffer(depthRb);
 408
 409       if (strb->surface && ctx->Depth.Mask) {
 410          if (is_scissor_enabled(ctx, depthRb) ||
 411              is_window_rectangle_enabled(ctx))
 412             quad_buffers |= PIPE_CLEAR_DEPTH;
 413          else
 414             clear_buffers |= PIPE_CLEAR_DEPTH;
 415       }
 416    }
 417    if (mask & BUFFER_BIT_STENCIL) {
 418       struct st_renderbuffer *strb = st_renderbuffer(stencilRb);
 419
 420       if (strb->surface && !is_stencil_disabled(ctx, stencilRb)) {
 421          if (is_scissor_enabled(ctx, stencilRb) ||
 422              is_window_rectangle_enabled(ctx) ||
 423              is_stencil_masked(ctx, stencilRb))
 424             quad_buffers |= PIPE_CLEAR_STENCIL;
 425          else
 426             clear_buffers |= PIPE_CLEAR_STENCIL;
 427       }
 428    }
 429
 430    /* Always clear depth and stencil together.
 431     * This can only happen when the stencil writemask is not a full mask.
 432     */
 433    if (quad_buffers & PIPE_CLEAR_DEPTHSTENCIL &&
 434        clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) {
 435       quad_buffers |= clear_buffers & PIPE_CLEAR_DEPTHSTENCIL;
 436       clear_buffers &= ~PIPE_CLEAR_DEPTHSTENCIL;
 437    }
 438
 439    /* Only use quad-based clearing for the renderbuffers which cannot
 440     * use pipe->clear. We want to always use pipe->clear for the other
 441     * renderbuffers, because it's likely to be faster.
 442     */
 443    if (quad_buffers) {
 444       clear_with_quad(ctx, quad_buffers);
 445    }
 446    if (clear_buffers) {
 447       /* We can't translate the clear color to the colorbuffer format,
 448        * because different colorbuffers may have different formats.
 449        */
 450       st->pipe->clear(st->pipe, clear_buffers,
 451                       (union pipe_color_union*)&ctx->Color.ClearColor,
 452                       ctx->Depth.Clear, ctx->Stencil.Clear);
 453    }
 454    if (mask & BUFFER_BIT_ACCUM)
 455       _mesa_clear_accum_buffer(ctx);
 456 }
 457
 458
 459 void
 460 st_init_clear_functions(struct dd_function_table *functions)
 461 {
 462    functions->Clear = st_Clear;
 463 }