src/mesa/state_tracker/st_cb_drawpixels.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   *   Brian Paul
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35 #include "main/bufferobj.h"
  36 #include "main/macros.h"
  37 #include "main/texformat.h"
  38 #include "shader/program.h"
  39 #include "shader/prog_parameter.h"
  40 #include "shader/prog_print.h"
  41
  42 #include "st_context.h"
  43 #include "st_atom.h"
  44 #include "st_atom_constbuf.h"
  45 #include "st_draw.h"
  46 #include "st_program.h"
  47 #include "st_cb_drawpixels.h"
  48 #include "st_cb_readpixels.h"
  49 #include "st_cb_fbo.h"
  50 #include "st_cb_texture.h"
  51 #include "st_draw.h"
  52 #include "st_format.h"
  53 #include "st_mesa_to_tgsi.h"
  54 #include "st_texture.h"
  55 #include "pipe/p_context.h"
  56 #include "pipe/p_defines.h"
  57 #include "pipe/p_inlines.h"
  58 #include "util/p_tile.h"
  59 #include "util/u_draw_quad.h"
  60 #include "shader/prog_instruction.h"
  61 #include "cso_cache/cso_context.h"
  62
  63
  64 /**
  65  * Check if the given program is:
  66  * 0: MOVE result.color, fragment.color;
  67  * 1: END;
  68  */
  69 static GLboolean
  70 is_passthrough_program(const struct gl_fragment_program *prog)
  71 {
  72    if (prog->Base.NumInstructions == 2) {
  73       const struct prog_instruction *inst = prog->Base.Instructions;
  74       if (inst[0].Opcode == OPCODE_MOV &&
  75           inst[1].Opcode == OPCODE_END &&
  76           inst[0].DstReg.File == PROGRAM_OUTPUT &&
  77           inst[0].DstReg.Index == FRAG_RESULT_COLR &&
  78           inst[0].DstReg.WriteMask == WRITEMASK_XYZW &&
  79           inst[0].SrcReg[0].File == PROGRAM_INPUT &&
  80           inst[0].SrcReg[0].Index == FRAG_ATTRIB_COL0 &&
  81           inst[0].SrcReg[0].Swizzle == SWIZZLE_XYZW) {
  82          return GL_TRUE;
  83       }
  84    }
  85    return GL_FALSE;
  86 }
  87
  88
  89
  90 /**
  91  * Make fragment shader for glDraw/CopyPixels.  This shader is made
  92  * by combining the pixel transfer shader with the user-defined shader.
  93  */
  94 static struct st_fragment_program *
  95 combined_drawpix_fragment_program(GLcontext *ctx)
  96 {
  97    struct st_context *st = ctx->st;
  98    struct st_fragment_program *stfp;
  99
 100    if (st->pixel_xfer.program->serialNo == st->pixel_xfer.xfer_prog_sn
 101        && st->fp->serialNo == st->pixel_xfer.user_prog_sn) {
 102       /* the pixel tranfer program has not changed and the user-defined
 103        * program has not changed, so re-use the combined program.
 104        */
 105       stfp = st->pixel_xfer.combined_prog;
 106    }
 107    else {
 108       /* Concatenate the pixel transfer program with the current user-
 109        * defined program.
 110        */
 111       if (is_passthrough_program(&st->fp->Base)) {
 112          stfp = (struct st_fragment_program *)
 113             _mesa_clone_program(ctx, &st->pixel_xfer.program->Base.Base);
 114       }
 115       else {
 116 #if 0
 117          printf("Base program:\n");
 118          _mesa_print_program(&st->fp->Base.Base);
 119          printf("DrawPix program:\n");
 120          _mesa_print_program(&st->pixel_xfer.program->Base.Base);
 121 #endif
 122          stfp = (struct st_fragment_program *)
 123             _mesa_combine_programs(ctx,
 124                                    &st->pixel_xfer.program->Base.Base,
 125                                    &st->fp->Base.Base);
 126       }
 127
 128 #if 0
 129       {
 130          struct gl_program *p = &stfp->Base.Base;
 131          printf("Combined DrawPixels program:\n");
 132          _mesa_print_program(p);
 133          printf("InputsRead: 0x%x\n", p->InputsRead);
 134          printf("OutputsWritten: 0x%x\n", p->OutputsWritten);
 135          _mesa_print_parameter_list(p->Parameters);
 136       }
 137 #endif
 138
 139       /* translate to TGSI tokens */
 140       st_translate_fragment_program(st, stfp, NULL);
 141
 142       /* save new program, update serial numbers */
 143       st->pixel_xfer.xfer_prog_sn = st->pixel_xfer.program->serialNo;
 144       st->pixel_xfer.user_prog_sn = st->fp->serialNo;
 145       st->pixel_xfer.combined_prog_sn = stfp->serialNo;
 146       st->pixel_xfer.combined_prog = stfp;
 147    }
 148
 149    /* Ideally we'd have updated the pipe constants during the normal
 150     * st/atom mechanism.  But we can't since this is specific to glDrawPixels.
 151     */
 152    st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);
 153
 154    return stfp;
 155 }
 156
 157
 158 /**
 159  * Create fragment shader that does a TEX() instruction to get a Z
 160  * value, then writes to FRAG_RESULT_DEPR.
 161  * Pass fragment color through as-is.
 162  */
 163 static struct st_fragment_program *
 164 make_fragment_shader_z(struct st_context *st)
 165 {
 166    GLcontext *ctx = st->ctx;
 167    /* only make programs once and re-use */
 168    static struct st_fragment_program *stfp = NULL;
 169    struct gl_program *p;
 170    GLuint ic = 0;
 171
 172    if (stfp)
 173       return stfp;
 174
 175    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 176    if (!p)
 177       return NULL;
 178
 179    p->NumInstructions = 3;
 180
 181    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 182    if (!p->Instructions) {
 183       ctx->Driver.DeleteProgram(ctx, p);
 184       return NULL;
 185    }
 186    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 187
 188    /* TEX result.depth, fragment.texcoord[0], texture[0], 2D; */
 189    p->Instructions[ic].Opcode = OPCODE_TEX;
 190    p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
 191    p->Instructions[ic].DstReg.Index = FRAG_RESULT_DEPR;
 192    p->Instructions[ic].DstReg.WriteMask = WRITEMASK_Z;
 193    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 194    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 195    p->Instructions[ic].TexSrcUnit = 0;
 196    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 197    ic++;
 198
 199    /* MOV result.color, fragment.color */
 200    p->Instructions[ic].Opcode = OPCODE_MOV;
 201    p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
 202    p->Instructions[ic].DstReg.Index = FRAG_RESULT_COLR;
 203    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 204    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_COL0;
 205    ic++;
 206
 207    /* END; */
 208    p->Instructions[ic++].Opcode = OPCODE_END;
 209
 210    assert(ic == p->NumInstructions);
 211
 212    p->InputsRead = FRAG_BIT_TEX0 | FRAG_BIT_COL0;
 213    p->OutputsWritten = (1 << FRAG_RESULT_COLR) | (1 << FRAG_RESULT_DEPR);
 214    p->SamplersUsed = 0x1;  /* sampler 0 (bit 0) is used */
 215
 216    stfp = (struct st_fragment_program *) p;
 217    st_translate_fragment_program(st, stfp, NULL);
 218
 219    return stfp;
 220 }
 221
 222
 223
 224 /**
 225  * Create a simple vertex shader that just passes through the
 226  * vertex position and texcoord (and optionally, color).
 227  */
 228 static struct st_vertex_program *
 229 st_make_passthrough_vertex_shader(struct st_context *st, GLboolean passColor)
 230 {
 231    /* only make programs once and re-use */
 232    static struct st_vertex_program *progs[2] = { NULL, NULL };
 233    GLcontext *ctx = st->ctx;
 234    struct st_vertex_program *stvp;
 235    struct gl_program *p;
 236    GLuint ic = 0;
 237
 238    if (progs[passColor])
 239       return progs[passColor];
 240
 241    p = ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
 242    if (!p)
 243       return NULL;
 244
 245    if (passColor)
 246       p->NumInstructions = 4;
 247    else
 248       p->NumInstructions = 3;
 249
 250    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 251    if (!p->Instructions) {
 252       ctx->Driver.DeleteProgram(ctx, p);
 253       return NULL;
 254    }
 255    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 256    /* MOV result.pos, vertex.pos; */
 257    p->Instructions[0].Opcode = OPCODE_MOV;
 258    p->Instructions[0].DstReg.File = PROGRAM_OUTPUT;
 259    p->Instructions[0].DstReg.Index = VERT_RESULT_HPOS;
 260    p->Instructions[0].SrcReg[0].File = PROGRAM_INPUT;
 261    p->Instructions[0].SrcReg[0].Index = VERT_ATTRIB_POS;
 262    /* MOV result.texcoord0, vertex.texcoord0; */
 263    p->Instructions[1].Opcode = OPCODE_MOV;
 264    p->Instructions[1].DstReg.File = PROGRAM_OUTPUT;
 265    p->Instructions[1].DstReg.Index = VERT_RESULT_TEX0;
 266    p->Instructions[1].SrcReg[0].File = PROGRAM_INPUT;
 267    p->Instructions[1].SrcReg[0].Index = VERT_ATTRIB_TEX0;
 268    ic = 2;
 269    if (passColor) {
 270       /* MOV result.color0, vertex.color0; */
 271       p->Instructions[ic].Opcode = OPCODE_MOV;
 272       p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
 273       p->Instructions[ic].DstReg.Index = VERT_RESULT_COL0;
 274       p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 275       p->Instructions[ic].SrcReg[0].Index = VERT_ATTRIB_COLOR0;
 276       ic++;
 277    }
 278
 279    /* END; */
 280    p->Instructions[ic].Opcode = OPCODE_END;
 281    ic++;
 282
 283    assert(ic == p->NumInstructions);
 284
 285    p->InputsRead = VERT_BIT_POS | VERT_BIT_TEX0;
 286    p->OutputsWritten = ((1 << VERT_RESULT_TEX0) |
 287                         (1 << VERT_RESULT_HPOS));
 288    if (passColor) {
 289       p->InputsRead |= VERT_BIT_COLOR0;
 290       p->OutputsWritten |= (1 << VERT_RESULT_COL0);
 291    }
 292
 293    stvp = (struct st_vertex_program *) p;
 294    st_translate_vertex_program(st, stvp, NULL);
 295
 296    progs[passColor] = stvp;
 297
 298    return stvp;
 299 }
 300
 301
 302 static GLenum
 303 _mesa_base_format(GLenum format)
 304 {
 305    switch (format) {
 306    case GL_DEPTH_COMPONENT:
 307       return GL_DEPTH_COMPONENT;
 308    case GL_STENCIL_INDEX:
 309       return GL_STENCIL_INDEX;
 310    default:
 311       return GL_RGBA;
 312    }
 313 }
 314
 315
 316 /**
 317  * Make texture containing an image for glDrawPixels image.
 318  * If 'pixels' is NULL, leave the texture image data undefined.
 319  */
 320 static struct pipe_texture *
 321 make_texture(struct st_context *st,
 322              GLsizei width, GLsizei height, GLenum format, GLenum type,
 323              const struct gl_pixelstore_attrib *unpack,
 324              const GLvoid *pixels)
 325 {
 326    GLcontext *ctx = st->ctx;
 327    struct pipe_context *pipe = st->pipe;
 328    struct pipe_screen *screen = pipe->screen;
 329    const struct gl_texture_format *mformat;
 330    struct pipe_texture *pt;
 331    enum pipe_format pipeFormat;
 332    GLuint cpp;
 333    GLenum baseFormat;
 334
 335    baseFormat = _mesa_base_format(format);
 336
 337    mformat = st_ChooseTextureFormat(ctx, baseFormat, format, type);
 338    assert(mformat);
 339
 340    pipeFormat = st_mesa_format_to_pipe_format(mformat->MesaFormat);
 341    assert(pipeFormat);
 342    cpp = st_sizeof_format(pipeFormat);
 343
 344    pixels = _mesa_map_drawpix_pbo(ctx, unpack, pixels);
 345    if (!pixels)
 346       return NULL;
 347
 348    pt = st_texture_create(st, PIPE_TEXTURE_2D, pipeFormat, 0, width, height,
 349                           1, 0);
 350    if (!pt) {
 351       _mesa_unmap_drawpix_pbo(ctx, unpack);
 352       return NULL;
 353    }
 354
 355    {
 356       struct pipe_surface *surface;
 357       static const GLuint dstImageOffsets = 0;
 358       GLboolean success;
 359       GLubyte *dest;
 360       const GLbitfield imageTransferStateSave = ctx->_ImageTransferState;
 361
 362       /* we'll do pixel transfer in a fragment shader */
 363       ctx->_ImageTransferState = 0x0;
 364
 365       surface = screen->get_tex_surface(screen, pt, 0, 0, 0);
 366
 367       /* map texture surface */
 368       dest = pipe_surface_map(surface);
 369
 370       /* Put image into texture surface.
 371        * Note that the image is actually going to be upside down in
 372        * the texture.  We deal with that with texcoords.
 373        */
 374       success = mformat->StoreImage(ctx, 2,           /* dims */
 375                                     baseFormat,       /* baseInternalFormat */
 376                                     mformat,          /* gl_texture_format */
 377                                     dest,             /* dest */
 378                                     0, 0, 0,          /* dstX/Y/Zoffset */
 379                                     surface->pitch * cpp, /* dstRowStride, bytes */
 380                                     &dstImageOffsets, /* dstImageOffsets */
 381                                     width, height, 1, /* size */
 382                                     format, type,     /* src format/type */
 383                                     pixels,           /* data source */
 384                                     unpack);
 385
 386       /* unmap */
 387       pipe_surface_unmap(surface);
 388       pipe_surface_reference(&surface, NULL);
 389       pipe->texture_update(pipe, pt, 0, 0x1);
 390
 391       assert(success);
 392
 393       /* restore */
 394       ctx->_ImageTransferState = imageTransferStateSave;
 395    }
 396
 397    _mesa_unmap_drawpix_pbo(ctx, unpack);
 398
 399    return pt;
 400 }
 401
 402
 403 /**
 404  * Draw quad with texcoords and optional color.
 405  * Coords are window coords with y=0=bottom.
 406  * \param color  may be null
 407  * \param invertTex  if true, flip texcoords vertically
 408  */
 409 static void
 410 draw_quad(GLcontext *ctx, GLfloat x0, GLfloat y0, GLfloat z,
 411           GLfloat x1, GLfloat y1, const GLfloat *color,
 412           GLboolean invertTex)
 413 {
 414    struct st_context *st = ctx->st;
 415    struct pipe_context *pipe = ctx->st->pipe;
 416    GLfloat verts[4][3][4]; /* four verts, three attribs, XYZW */
 417
 418    /* setup vertex data */
 419    {
 420       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 421       const GLfloat fb_width = fb->Width;
 422       const GLfloat fb_height = fb->Height;
 423       const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 424       const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 425       const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 426       const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 427       const GLfloat sLeft = 0.0F, sRight = 1.0F;
 428       const GLfloat tTop = invertTex, tBot = 1.0 - tTop;
 429       GLuint tex, i;
 430
 431       /* upper-left */
 432       verts[0][0][0] = clip_x0;    /* v[0].attr[0].x */
 433       verts[0][0][1] = clip_y0;    /* v[0].attr[0].y */
 434
 435       /* upper-right */
 436       verts[1][0][0] = clip_x1;
 437       verts[1][0][1] = clip_y0;
 438
 439       /* lower-right */
 440       verts[2][0][0] = clip_x1;
 441       verts[2][0][1] = clip_y1;
 442
 443       /* lower-left */
 444       verts[3][0][0] = clip_x0;
 445       verts[3][0][1] = clip_y1;
 446
 447       tex = color ? 2 : 1;
 448       verts[0][tex][0] = sLeft; /* v[0].attr[tex].s */
 449       verts[0][tex][1] = tTop;  /* v[0].attr[tex].t */
 450       verts[1][tex][0] = sRight;
 451       verts[1][tex][1] = tTop;
 452       verts[2][tex][0] = sRight;
 453       verts[2][tex][1] = tBot;
 454       verts[3][tex][0] = sLeft;
 455       verts[3][tex][1] = tBot;
 456
 457       /* same for all verts: */
 458       if (color) {
 459          for (i = 0; i < 4; i++) {
 460             verts[i][0][2] = z;   /*Z*/
 461             verts[i][0][3] = 1.0; /*W*/
 462             verts[i][1][0] = color[0];
 463             verts[i][1][1] = color[1];
 464             verts[i][1][2] = color[2];
 465             verts[i][1][3] = color[3];
 466             verts[i][2][2] = 0.0; /*R*/
 467             verts[i][2][3] = 1.0; /*Q*/
 468          }
 469       }
 470       else {
 471          for (i = 0; i < 4; i++) {
 472             verts[i][0][2] = z;   /*Z*/
 473             verts[i][0][3] = 1.0; /*W*/
 474             verts[i][1][2] = 0.0; /*R*/
 475             verts[i][1][3] = 1.0; /*Q*/
 476          }
 477       }
 478    }
 479
 480    {
 481       struct pipe_buffer *buf;
 482       ubyte *map;
 483
 484       /* allocate/load buffer object with vertex data */
 485       buf = pipe_buffer_create(pipe,32, PIPE_BUFFER_USAGE_VERTEX,
 486                                sizeof(verts));
 487       map = pipe_buffer_map(pipe, buf, PIPE_BUFFER_USAGE_CPU_WRITE);
 488       memcpy(map, verts, sizeof(verts));
 489       pipe_buffer_unmap(pipe, buf);
 490
 491       util_draw_vertex_buffer(pipe, buf,
 492                               PIPE_PRIM_QUADS,
 493                               4,  /* verts */
 494                               3); /* attribs/vert */
 495
 496       pipe_buffer_destroy(pipe, buf);
 497    }
 498 }
 499
 500
 501
 502 static void
 503 draw_textured_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 504                    GLsizei width, GLsizei height,
 505                    GLfloat zoomX, GLfloat zoomY,
 506                    struct pipe_texture *pt,
 507                    struct st_vertex_program *stvp,
 508                    struct st_fragment_program *stfp,
 509                    const GLfloat *color,
 510                    GLboolean invertTex)
 511 {
 512    struct st_context *st = ctx->st;
 513    struct pipe_context *pipe = ctx->st->pipe;
 514    struct cso_context *cso = ctx->st->cso_context;
 515    GLfloat x0, y0, x1, y1;
 516    GLuint maxSize;
 517
 518    /* limit checks */
 519    /* XXX if DrawPixels image is larger than max texture size, break
 520     * it up into chunks.
 521     */
 522    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 523    assert(width <= maxSize);
 524    assert(height <= maxSize);
 525
 526    cso_save_rasterizer(cso);
 527    cso_save_viewport(cso);
 528    cso_save_samplers(cso);
 529    cso_save_sampler_textures(cso);
 530    cso_save_fragment_shader(cso);
 531    cso_save_vertex_shader(cso);
 532
 533    /* rasterizer state: just scissor */
 534    {
 535       struct pipe_rasterizer_state rasterizer;
 536       memset(&rasterizer, 0, sizeof(rasterizer));
 537       rasterizer.gl_rasterization_rules = 1;
 538       rasterizer.scissor = ctx->Scissor.Enabled;
 539       cso_set_rasterizer(cso, &rasterizer);
 540    }
 541
 542    /* fragment shader state: TEX lookup program */
 543    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 544
 545    /* vertex shader state: position + texcoord pass-through */
 546    cso_set_vertex_shader_handle(cso, stvp->driver_shader);
 547
 548
 549    /* texture sampling state: */
 550    {
 551       struct pipe_sampler_state sampler;
 552       memset(&sampler, 0, sizeof(sampler));
 553       sampler.wrap_s = PIPE_TEX_WRAP_CLAMP;
 554       sampler.wrap_t = PIPE_TEX_WRAP_CLAMP;
 555       sampler.wrap_r = PIPE_TEX_WRAP_CLAMP;
 556       sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 557       sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 558       sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 559       sampler.normalized_coords = 1;
 560
 561       cso_single_sampler(cso, 0, &sampler);
 562       if (st->pixel_xfer.pixelmap_enabled) {
 563          cso_single_sampler(cso, 1, &sampler);
 564       }
 565       cso_single_sampler_done(cso);
 566    }
 567
 568    /* viewport state: viewport matching window dims */
 569    {
 570       const float width = ctx->DrawBuffer->Width;
 571       const float height = ctx->DrawBuffer->Height;
 572       struct pipe_viewport_state vp;
 573       vp.scale[0] =  0.5 * width;
 574       vp.scale[1] = -0.5 * height;
 575       vp.scale[2] = 1.0;
 576       vp.scale[3] = 1.0;
 577       vp.translate[0] = 0.5 * width;
 578       vp.translate[1] = 0.5 * height;
 579       vp.translate[2] = 0.0;
 580       vp.translate[3] = 0.0;
 581       cso_set_viewport(cso, &vp);
 582    }
 583
 584    /* texture state: */
 585    if (st->pixel_xfer.pixelmap_enabled) {
 586       struct pipe_texture *textures[2];
 587       textures[0] = pt;
 588       textures[1] = st->pixel_xfer.pixelmap_texture;
 589       pipe->set_sampler_textures(pipe, 2, textures);
 590    }
 591    else {
 592       pipe->set_sampler_textures(pipe, 1, &pt);
 593    }
 594
 595    /* Compute window coords (y=0=bottom) with pixel zoom.
 596     * Recall that these coords are transformed by the current
 597     * vertex shader and viewport transformation.
 598     */
 599    x0 = x;
 600    x1 = x + width * ctx->Pixel.ZoomX;
 601    y0 = y;
 602    y1 = y + height * ctx->Pixel.ZoomY;
 603    draw_quad(ctx, x0, y0, z, x1, y1, color, invertTex);
 604
 605    /* restore state */
 606    cso_restore_rasterizer(cso);
 607    cso_restore_viewport(cso);
 608    cso_restore_samplers(cso);
 609    cso_restore_sampler_textures(cso);
 610    cso_restore_fragment_shader(cso);
 611    cso_restore_vertex_shader(cso);
 612 }
 613
 614
 615 /**
 616  * Check if a GL format/type combination is a match to the given pipe format.
 617  * XXX probably move this to a re-usable place.
 618  */
 619 static GLboolean
 620 compatible_formats(GLenum format, GLenum type, enum pipe_format pipeFormat)
 621 {
 622    static const GLuint one = 1;
 623    GLubyte littleEndian = *((GLubyte *) &one);
 624
 625    if (pipeFormat == PIPE_FORMAT_R8G8B8A8_UNORM &&
 626        format == GL_RGBA &&
 627        type == GL_UNSIGNED_BYTE &&
 628        !littleEndian) {
 629       return GL_TRUE;
 630    }
 631    else if (pipeFormat == PIPE_FORMAT_R8G8B8A8_UNORM &&
 632             format == GL_ABGR_EXT &&
 633             type == GL_UNSIGNED_BYTE &&
 634             littleEndian) {
 635       return GL_TRUE;
 636    }
 637    else if (pipeFormat == PIPE_FORMAT_A8R8G8B8_UNORM &&
 638             format == GL_BGRA &&
 639             type == GL_UNSIGNED_BYTE &&
 640             littleEndian) {
 641       return GL_TRUE;
 642    }
 643    else if (pipeFormat == PIPE_FORMAT_R5G6B5_UNORM &&
 644             format == GL_RGB &&
 645             type == GL_UNSIGNED_SHORT_5_6_5) {
 646       /* endian don't care */
 647       return GL_TRUE;
 648    }
 649    else if (pipeFormat == PIPE_FORMAT_R5G6B5_UNORM &&
 650             format == GL_BGR &&
 651             type == GL_UNSIGNED_SHORT_5_6_5_REV) {
 652       /* endian don't care */
 653       return GL_TRUE;
 654    }
 655    else if (pipeFormat == PIPE_FORMAT_S8_UNORM &&
 656             format == GL_STENCIL_INDEX &&
 657             type == GL_UNSIGNED_BYTE) {
 658       return GL_TRUE;
 659    }
 660    else if (pipeFormat == PIPE_FORMAT_Z32_UNORM &&
 661             format == GL_DEPTH_COMPONENT &&
 662             type == GL_UNSIGNED_INT) {
 663       return GL_TRUE;
 664    }
 665    /* XXX add more cases */
 666    else {
 667       return GL_FALSE;
 668    }
 669 }
 670
 671
 672 /**
 673  * Check if any per-fragment ops are enabled.
 674  * XXX probably move this to a re-usable place.
 675  */
 676 static GLboolean
 677 any_fragment_ops(const struct st_context *st)
 678 {
 679    if (st->state.depth_stencil.alpha.enabled ||
 680        st->state.depth_stencil.depth.enabled ||
 681        st->state.blend.blend_enable ||
 682        st->state.blend.logicop_enable)
 683       /* XXX more checks */
 684       return GL_TRUE;
 685    else
 686       return GL_FALSE;
 687 }
 688
 689
 690 /**
 691  * Check if any pixel transfer ops are enabled.
 692  * XXX probably move this to a re-usable place.
 693  */
 694 static GLboolean
 695 any_pixel_transfer_ops(const struct st_context *st)
 696 {
 697    if (st->ctx->Pixel.RedScale != 1.0 ||
 698        st->ctx->Pixel.RedBias != 0.0 ||
 699        st->ctx->Pixel.GreenScale != 1.0 ||
 700        st->ctx->Pixel.GreenBias != 0.0 ||
 701        st->ctx->Pixel.BlueScale != 1.0 ||
 702        st->ctx->Pixel.BlueBias != 0.0 ||
 703        st->ctx->Pixel.AlphaScale != 1.0 ||
 704        st->ctx->Pixel.AlphaBias != 0.0 ||
 705        st->ctx->Pixel.MapColorFlag)
 706       /* XXX more checks */
 707       return GL_TRUE;
 708    else
 709       return GL_FALSE;
 710 }
 711
 712
 713 /**
 714  * Draw image with a blit, or other non-textured quad method.
 715  */
 716 static void
 717 draw_blit(struct st_context *st,
 718           GLsizei width, GLsizei height,
 719           GLenum format, GLenum type, const GLvoid *pixels)
 720 {
 721
 722
 723 }
 724
 725
 726 static void
 727 draw_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
 728                     GLsizei width, GLsizei height, GLenum type,
 729                     const struct gl_pixelstore_attrib *unpack,
 730                     const GLvoid *pixels)
 731 {
 732    struct st_context *st = ctx->st;
 733    struct pipe_context *pipe = st->pipe;
 734    struct pipe_surface *ps = st->state.framebuffer.zsbuf;
 735    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 736    GLint skipPixels;
 737    ubyte *stmap;
 738
 739    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 740
 741    /* map the stencil buffer */
 742    stmap = pipe_surface_map(ps);
 743
 744    /* if width > MAX_WIDTH, have to process image in chunks */
 745    skipPixels = 0;
 746    while (skipPixels < width) {
 747       const GLint spanX = x + skipPixels;
 748       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 749       GLint row;
 750       for (row = 0; row < height; row++) {
 751          GLint spanY = y + row;
 752          GLubyte values[MAX_WIDTH];
 753          GLenum destType = GL_UNSIGNED_BYTE;
 754          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 755                                                       width, height,
 756                                                       GL_COLOR_INDEX, type,
 757                                                       row, skipPixels);
 758          _mesa_unpack_stencil_span(ctx, spanWidth, destType, values,
 759                                    type, source, unpack,
 760                                    ctx->_ImageTransferState);
 761          if (zoom) {
 762             /*
 763             _swrast_write_zoomed_stencil_span(ctx, x, y, spanWidth,
 764                                               spanX, spanY, values);
 765             */
 766          }
 767          else {
 768             if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 769                spanY = ctx->DrawBuffer->Height - spanY - 1;
 770             }
 771
 772             switch (ps->format) {
 773             case PIPE_FORMAT_S8_UNORM:
 774                {
 775                   ubyte *dest = stmap + spanY * ps->pitch + spanX;
 776                   memcpy(dest, values, spanWidth);
 777                }
 778                break;
 779             case PIPE_FORMAT_S8Z24_UNORM:
 780                {
 781                   uint *dest = (uint *) stmap + spanY * ps->pitch + spanX;
 782                   GLint k;
 783                   for (k = 0; k < spanWidth; k++) {
 784                      uint p = dest[k];
 785                      p = (p & 0xffffff) | (values[k] << 24);
 786                      dest[k] = p;
 787                   }
 788                }
 789                break;
 790             default:
 791                assert(0);
 792             }
 793          }
 794       }
 795       skipPixels += spanWidth;
 796    }
 797
 798    /* unmap the stencil buffer */
 799    pipe_surface_unmap(ps);
 800 }
 801
 802
 803 /**
 804  * Called via ctx->Driver.DrawPixels()
 805  */
 806 static void
 807 st_DrawPixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 808               GLenum format, GLenum type,
 809               const struct gl_pixelstore_attrib *unpack, const GLvoid *pixels)
 810 {
 811    struct st_fragment_program *stfp;
 812    struct st_vertex_program *stvp;
 813    struct st_context *st = ctx->st;
 814    struct pipe_surface *ps;
 815    GLuint bufferFormat;
 816    const GLfloat *color;
 817
 818    if (format == GL_STENCIL_INDEX) {
 819       draw_stencil_pixels(ctx, x, y, width, height, type, unpack, pixels);
 820       return;
 821    }
 822
 823    st_validate_state(st);
 824
 825    if (format == GL_DEPTH_COMPONENT) {
 826       ps = st->state.framebuffer.zsbuf;
 827       stfp = make_fragment_shader_z(ctx->st);
 828       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_TRUE);
 829       color = ctx->Current.RasterColor;
 830    }
 831    else if (format == GL_STENCIL_INDEX) {
 832       ps = st->state.framebuffer.zsbuf;
 833       /* XXX special case - can't use texture map */
 834       color = NULL;
 835    }
 836    else {
 837       ps = st->state.framebuffer.cbufs[0];
 838       stfp = combined_drawpix_fragment_program(ctx);
 839       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_FALSE);
 840       color = NULL;
 841    }
 842
 843    bufferFormat = ps->format;
 844
 845    if (1/*any_fragment_ops(st) ||
 846        any_pixel_transfer_ops(st) ||
 847        !compatible_formats(format, type, ps->format)*/) {
 848       /* textured quad */
 849       struct pipe_texture *pt
 850          = make_texture(ctx->st, width, height, format, type, unpack, pixels);
 851       if (pt) {
 852          draw_textured_quad(ctx, x, y, ctx->Current.RasterPos[2],
 853                             width, height, ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,
 854                             pt, stvp, stfp, color, GL_FALSE);
 855          pipe_texture_reference(&pt, NULL);
 856       }
 857    }
 858    else {
 859       /* blit */
 860       draw_blit(st, width, height, format, type, pixels);
 861    }
 862 }
 863
 864
 865
 866 static void
 867 copy_stencil_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 868                     GLsizei width, GLsizei height,
 869                     GLint dstx, GLint dsty)
 870 {
 871    struct st_renderbuffer *rbDraw = st_renderbuffer(ctx->DrawBuffer->_StencilBuffer);
 872    struct pipe_surface *psDraw = rbDraw->surface;
 873    ubyte *drawMap;
 874    ubyte *buffer;
 875    int i;
 876
 877    buffer = malloc(width * height * sizeof(ubyte));
 878    if (!buffer) {
 879       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels(stencil)");
 880       return;
 881    }
 882
 883    /* this will do stencil pixel transfer ops */
 884    st_read_stencil_pixels(ctx, srcx, srcy, width, height, GL_UNSIGNED_BYTE,
 885                           &ctx->DefaultPacking, buffer);
 886
 887    /* map the stencil buffer */
 888    drawMap = pipe_surface_map(psDraw);
 889
 890    /* draw */
 891    /* XXX PixelZoom not handled yet */
 892    for (i = 0; i < height; i++) {
 893       ubyte *dst;
 894       const ubyte *src;
 895       int y;
 896
 897       y = dsty + i;
 898
 899       if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 900          y = ctx->DrawBuffer->Height - y - 1;
 901       }
 902
 903       dst = drawMap + (y * psDraw->pitch + dstx) * psDraw->cpp;
 904       src = buffer + i * width;
 905
 906       switch (psDraw->format) {
 907       case PIPE_FORMAT_S8Z24_UNORM:
 908          {
 909             uint *dst4 = (uint *) dst;
 910             int j;
 911             for (j = 0; j < width; j++) {
 912                *dst4 = (*dst4 & 0xffffff) | (src[j] << 24);
 913                dst4++;
 914             }
 915          }
 916          break;
 917       case PIPE_FORMAT_S8_UNORM:
 918          memcpy(dst, src, width);
 919          break;
 920       default:
 921          assert(0);
 922       }
 923    }
 924
 925    free(buffer);
 926
 927    /* unmap the stencil buffer */
 928    pipe_surface_unmap(psDraw);
 929 }
 930
 931
 932 static void
 933 st_CopyPixels(GLcontext *ctx, GLint srcx, GLint srcy,
 934               GLsizei width, GLsizei height,
 935               GLint dstx, GLint dsty, GLenum type)
 936 {
 937    struct st_context *st = ctx->st;
 938    struct pipe_context *pipe = st->pipe;
 939    struct pipe_screen *screen = pipe->screen;
 940    struct st_renderbuffer *rbRead;
 941    struct st_vertex_program *stvp;
 942    struct st_fragment_program *stfp;
 943    struct pipe_surface *psRead;
 944    struct pipe_surface *psTex;
 945    struct pipe_texture *pt;
 946    GLfloat *color;
 947    enum pipe_format srcFormat, texFormat;
 948
 949    /* make sure rendering has completed */
 950    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 951
 952    st_validate_state(st);
 953
 954    if (type == GL_STENCIL) {
 955       /* can't use texturing to do stencil */
 956       copy_stencil_pixels(ctx, srcx, srcy, width, height, dstx, dsty);
 957       return;
 958    }
 959
 960    if (type == GL_COLOR) {
 961       rbRead = st_get_color_read_renderbuffer(ctx);
 962       color = NULL;
 963       stfp = combined_drawpix_fragment_program(ctx);
 964       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_FALSE);
 965    }
 966    else {
 967       assert(type == GL_DEPTH);
 968       rbRead = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
 969       color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 970       stfp = make_fragment_shader_z(ctx->st);
 971       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_TRUE);
 972    }
 973
 974    psRead = rbRead->surface;
 975    srcFormat = psRead->format;
 976
 977    if (screen->is_format_supported(screen, srcFormat, PIPE_TEXTURE)) {
 978       texFormat = srcFormat;
 979    }
 980    else {
 981       /* srcFormat can't be used as a texture format */
 982       if (type == GL_DEPTH) {
 983          texFormat = st_choose_format(pipe, GL_DEPTH_COMPONENT, PIPE_TEXTURE);
 984          assert(texFormat != PIPE_FORMAT_NONE); /* XXX no depth texture formats??? */
 985       }
 986       else {
 987          /* todo */
 988          assert(0);
 989       }
 990    }
 991
 992    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, texFormat, 0,
 993                           width, height, 1, 0);
 994    if (!pt)
 995       return;
 996
 997    psTex = screen->get_tex_surface(screen, pt, 0, 0, 0);
 998
 999    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
1000       srcy = ctx->DrawBuffer->Height - srcy - height;
1001    }
1002
1003    if (srcFormat == texFormat) {
1004       /* copy source framebuffer surface into mipmap/texture */
1005       pipe->surface_copy(pipe,
1006                          FALSE,
1007                          psTex, /* dest */
1008                          0, 0, /* destx/y */
1009                          psRead,
1010                          srcx, srcy, width, height);
1011    }
1012    else if (type == GL_COLOR) {
1013       /* alternate path using get/put_tile() */
1014       GLfloat *buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
1015
1016       pipe_get_tile_rgba(pipe, psRead, srcx, srcy, width, height, buf);
1017       pipe_put_tile_rgba(pipe, psTex, 0, 0, width, height, buf);
1018
1019       free(buf);
1020    }
1021    else {
1022       /* GL_DEPTH */
1023       GLuint *buf = (GLuint *) malloc(width * height * sizeof(GLuint));
1024       pipe_get_tile_z(pipe, psRead, srcx, srcy, width, height, buf);
1025       pipe_put_tile_z(pipe, psTex, 0, 0, width, height, buf);
1026       free(buf);
1027    }
1028
1029    /* draw textured quad */
1030    draw_textured_quad(ctx, dstx, dsty, ctx->Current.RasterPos[2],
1031                       width, height, ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,
1032                       pt, stvp, stfp, color, GL_TRUE);
1033
1034    pipe_surface_reference(&psTex, NULL);
1035    pipe_texture_reference(&pt, NULL);
1036 }
1037
1038
1039
1040 void st_init_drawpixels_functions(struct dd_function_table *functions)
1041 {
1042    functions->DrawPixels = st_DrawPixels;
1043    functions->CopyPixels = st_CopyPixels;
1044 }