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                           PIPE_TEXTURE_USAGE_SAMPLER);
 351    if (!pt) {
 352       _mesa_unmap_drawpix_pbo(ctx, unpack);
 353       return NULL;
 354    }
 355
 356    {
 357       struct pipe_surface *surface;
 358       static const GLuint dstImageOffsets = 0;
 359       GLboolean success;
 360       GLubyte *dest;
 361       const GLbitfield imageTransferStateSave = ctx->_ImageTransferState;
 362
 363       /* we'll do pixel transfer in a fragment shader */
 364       ctx->_ImageTransferState = 0x0;
 365
 366       surface = screen->get_tex_surface(screen, pt, 0, 0, 0,
 367                                         PIPE_BUFFER_USAGE_CPU_WRITE);
 368
 369       /* map texture surface */
 370       dest = screen->surface_map(screen, surface,
 371                                  PIPE_BUFFER_USAGE_CPU_WRITE);
 372
 373       /* Put image into texture surface.
 374        * Note that the image is actually going to be upside down in
 375        * the texture.  We deal with that with texcoords.
 376        */
 377       success = mformat->StoreImage(ctx, 2,           /* dims */
 378                                     baseFormat,       /* baseInternalFormat */
 379                                     mformat,          /* gl_texture_format */
 380                                     dest,             /* dest */
 381                                     0, 0, 0,          /* dstX/Y/Zoffset */
 382                                     surface->pitch * cpp, /* dstRowStride, bytes */
 383                                     &dstImageOffsets, /* dstImageOffsets */
 384                                     width, height, 1, /* size */
 385                                     format, type,     /* src format/type */
 386                                     pixels,           /* data source */
 387                                     unpack);
 388
 389       /* unmap */
 390       screen->surface_unmap(screen, surface);
 391       pipe_surface_reference(&surface, NULL);
 392
 393       assert(success);
 394
 395       /* restore */
 396       ctx->_ImageTransferState = imageTransferStateSave;
 397    }
 398
 399    _mesa_unmap_drawpix_pbo(ctx, unpack);
 400
 401    return pt;
 402 }
 403
 404
 405 /**
 406  * Draw quad with texcoords and optional color.
 407  * Coords are window coords with y=0=bottom.
 408  * \param color  may be null
 409  * \param invertTex  if true, flip texcoords vertically
 410  */
 411 static void
 412 draw_quad(GLcontext *ctx, GLfloat x0, GLfloat y0, GLfloat z,
 413           GLfloat x1, GLfloat y1, const GLfloat *color,
 414           GLboolean invertTex)
 415 {
 416    struct st_context *st = ctx->st;
 417    struct pipe_context *pipe = ctx->st->pipe;
 418    GLfloat verts[4][3][4]; /* four verts, three attribs, XYZW */
 419
 420    /* setup vertex data */
 421    {
 422       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 423       const GLfloat fb_width = fb->Width;
 424       const GLfloat fb_height = fb->Height;
 425       const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 426       const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 427       const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 428       const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 429       const GLfloat sLeft = 0.0F, sRight = 1.0F;
 430       const GLfloat tTop = invertTex, tBot = 1.0 - tTop;
 431       GLuint tex, i;
 432
 433       /* upper-left */
 434       verts[0][0][0] = clip_x0;    /* v[0].attr[0].x */
 435       verts[0][0][1] = clip_y0;    /* v[0].attr[0].y */
 436
 437       /* upper-right */
 438       verts[1][0][0] = clip_x1;
 439       verts[1][0][1] = clip_y0;
 440
 441       /* lower-right */
 442       verts[2][0][0] = clip_x1;
 443       verts[2][0][1] = clip_y1;
 444
 445       /* lower-left */
 446       verts[3][0][0] = clip_x0;
 447       verts[3][0][1] = clip_y1;
 448
 449       tex = color ? 2 : 1;
 450       verts[0][tex][0] = sLeft; /* v[0].attr[tex].s */
 451       verts[0][tex][1] = tTop;  /* v[0].attr[tex].t */
 452       verts[1][tex][0] = sRight;
 453       verts[1][tex][1] = tTop;
 454       verts[2][tex][0] = sRight;
 455       verts[2][tex][1] = tBot;
 456       verts[3][tex][0] = sLeft;
 457       verts[3][tex][1] = tBot;
 458
 459       /* same for all verts: */
 460       if (color) {
 461          for (i = 0; i < 4; i++) {
 462             verts[i][0][2] = z;   /*Z*/
 463             verts[i][0][3] = 1.0; /*W*/
 464             verts[i][1][0] = color[0];
 465             verts[i][1][1] = color[1];
 466             verts[i][1][2] = color[2];
 467             verts[i][1][3] = color[3];
 468             verts[i][2][2] = 0.0; /*R*/
 469             verts[i][2][3] = 1.0; /*Q*/
 470          }
 471       }
 472       else {
 473          for (i = 0; i < 4; i++) {
 474             verts[i][0][2] = z;   /*Z*/
 475             verts[i][0][3] = 1.0; /*W*/
 476             verts[i][1][2] = 0.0; /*R*/
 477             verts[i][1][3] = 1.0; /*Q*/
 478          }
 479       }
 480    }
 481
 482    {
 483       struct pipe_buffer *buf;
 484       ubyte *map;
 485
 486       /* allocate/load buffer object with vertex data */
 487       buf = pipe_buffer_create(pipe,32, PIPE_BUFFER_USAGE_VERTEX,
 488                                sizeof(verts));
 489       map = pipe_buffer_map(pipe, buf, PIPE_BUFFER_USAGE_CPU_WRITE);
 490       memcpy(map, verts, sizeof(verts));
 491       pipe_buffer_unmap(pipe, buf);
 492
 493       util_draw_vertex_buffer(pipe, buf,
 494                               PIPE_PRIM_QUADS,
 495                               4,  /* verts */
 496                               3); /* attribs/vert */
 497
 498       pipe_buffer_destroy(pipe, buf);
 499    }
 500 }
 501
 502
 503
 504 static void
 505 draw_textured_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 506                    GLsizei width, GLsizei height,
 507                    GLfloat zoomX, GLfloat zoomY,
 508                    struct pipe_texture *pt,
 509                    struct st_vertex_program *stvp,
 510                    struct st_fragment_program *stfp,
 511                    const GLfloat *color,
 512                    GLboolean invertTex)
 513 {
 514    struct st_context *st = ctx->st;
 515    struct pipe_context *pipe = ctx->st->pipe;
 516    struct cso_context *cso = ctx->st->cso_context;
 517    GLfloat x0, y0, x1, y1;
 518    GLuint maxSize;
 519
 520    /* limit checks */
 521    /* XXX if DrawPixels image is larger than max texture size, break
 522     * it up into chunks.
 523     */
 524    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 525    assert(width <= maxSize);
 526    assert(height <= maxSize);
 527
 528    cso_save_rasterizer(cso);
 529    cso_save_viewport(cso);
 530    cso_save_samplers(cso);
 531    cso_save_sampler_textures(cso);
 532    cso_save_fragment_shader(cso);
 533    cso_save_vertex_shader(cso);
 534
 535    /* rasterizer state: just scissor */
 536    {
 537       struct pipe_rasterizer_state rasterizer;
 538       memset(&rasterizer, 0, sizeof(rasterizer));
 539       rasterizer.gl_rasterization_rules = 1;
 540       rasterizer.scissor = ctx->Scissor.Enabled;
 541       cso_set_rasterizer(cso, &rasterizer);
 542    }
 543
 544    /* fragment shader state: TEX lookup program */
 545    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 546
 547    /* vertex shader state: position + texcoord pass-through */
 548    cso_set_vertex_shader_handle(cso, stvp->driver_shader);
 549
 550
 551    /* texture sampling state: */
 552    {
 553       struct pipe_sampler_state sampler;
 554       memset(&sampler, 0, sizeof(sampler));
 555       sampler.wrap_s = PIPE_TEX_WRAP_CLAMP;
 556       sampler.wrap_t = PIPE_TEX_WRAP_CLAMP;
 557       sampler.wrap_r = PIPE_TEX_WRAP_CLAMP;
 558       sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 559       sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 560       sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 561       sampler.normalized_coords = 1;
 562
 563       cso_single_sampler(cso, 0, &sampler);
 564       if (st->pixel_xfer.pixelmap_enabled) {
 565          cso_single_sampler(cso, 1, &sampler);
 566       }
 567       cso_single_sampler_done(cso);
 568    }
 569
 570    /* viewport state: viewport matching window dims */
 571    {
 572       const float width = ctx->DrawBuffer->Width;
 573       const float height = ctx->DrawBuffer->Height;
 574       struct pipe_viewport_state vp;
 575       vp.scale[0] =  0.5 * width;
 576       vp.scale[1] = -0.5 * height;
 577       vp.scale[2] = 1.0;
 578       vp.scale[3] = 1.0;
 579       vp.translate[0] = 0.5 * width;
 580       vp.translate[1] = 0.5 * height;
 581       vp.translate[2] = 0.0;
 582       vp.translate[3] = 0.0;
 583       cso_set_viewport(cso, &vp);
 584    }
 585
 586    /* texture state: */
 587    if (st->pixel_xfer.pixelmap_enabled) {
 588       struct pipe_texture *textures[2];
 589       textures[0] = pt;
 590       textures[1] = st->pixel_xfer.pixelmap_texture;
 591       pipe->set_sampler_textures(pipe, 2, textures);
 592    }
 593    else {
 594       pipe->set_sampler_textures(pipe, 1, &pt);
 595    }
 596
 597    /* Compute window coords (y=0=bottom) with pixel zoom.
 598     * Recall that these coords are transformed by the current
 599     * vertex shader and viewport transformation.
 600     */
 601    x0 = x;
 602    x1 = x + width * ctx->Pixel.ZoomX;
 603    y0 = y;
 604    y1 = y + height * ctx->Pixel.ZoomY;
 605    draw_quad(ctx, x0, y0, z, x1, y1, color, invertTex);
 606
 607    /* restore state */
 608    cso_restore_rasterizer(cso);
 609    cso_restore_viewport(cso);
 610    cso_restore_samplers(cso);
 611    cso_restore_sampler_textures(cso);
 612    cso_restore_fragment_shader(cso);
 613    cso_restore_vertex_shader(cso);
 614 }
 615
 616
 617 /**
 618  * Check if a GL format/type combination is a match to the given pipe format.
 619  * XXX probably move this to a re-usable place.
 620  */
 621 static GLboolean
 622 compatible_formats(GLenum format, GLenum type, enum pipe_format pipeFormat)
 623 {
 624    static const GLuint one = 1;
 625    GLubyte littleEndian = *((GLubyte *) &one);
 626
 627    if (pipeFormat == PIPE_FORMAT_R8G8B8A8_UNORM &&
 628        format == GL_RGBA &&
 629        type == GL_UNSIGNED_BYTE &&
 630        !littleEndian) {
 631       return GL_TRUE;
 632    }
 633    else if (pipeFormat == PIPE_FORMAT_R8G8B8A8_UNORM &&
 634             format == GL_ABGR_EXT &&
 635             type == GL_UNSIGNED_BYTE &&
 636             littleEndian) {
 637       return GL_TRUE;
 638    }
 639    else if (pipeFormat == PIPE_FORMAT_A8R8G8B8_UNORM &&
 640             format == GL_BGRA &&
 641             type == GL_UNSIGNED_BYTE &&
 642             littleEndian) {
 643       return GL_TRUE;
 644    }
 645    else if (pipeFormat == PIPE_FORMAT_R5G6B5_UNORM &&
 646             format == GL_RGB &&
 647             type == GL_UNSIGNED_SHORT_5_6_5) {
 648       /* endian don't care */
 649       return GL_TRUE;
 650    }
 651    else if (pipeFormat == PIPE_FORMAT_R5G6B5_UNORM &&
 652             format == GL_BGR &&
 653             type == GL_UNSIGNED_SHORT_5_6_5_REV) {
 654       /* endian don't care */
 655       return GL_TRUE;
 656    }
 657    else if (pipeFormat == PIPE_FORMAT_S8_UNORM &&
 658             format == GL_STENCIL_INDEX &&
 659             type == GL_UNSIGNED_BYTE) {
 660       return GL_TRUE;
 661    }
 662    else if (pipeFormat == PIPE_FORMAT_Z32_UNORM &&
 663             format == GL_DEPTH_COMPONENT &&
 664             type == GL_UNSIGNED_INT) {
 665       return GL_TRUE;
 666    }
 667    /* XXX add more cases */
 668    else {
 669       return GL_FALSE;
 670    }
 671 }
 672
 673
 674 /**
 675  * Check if any per-fragment ops are enabled.
 676  * XXX probably move this to a re-usable place.
 677  */
 678 static GLboolean
 679 any_fragment_ops(const struct st_context *st)
 680 {
 681    if (st->state.depth_stencil.alpha.enabled ||
 682        st->state.depth_stencil.depth.enabled ||
 683        st->state.blend.blend_enable ||
 684        st->state.blend.logicop_enable)
 685       /* XXX more checks */
 686       return GL_TRUE;
 687    else
 688       return GL_FALSE;
 689 }
 690
 691
 692 /**
 693  * Check if any pixel transfer ops are enabled.
 694  * XXX probably move this to a re-usable place.
 695  */
 696 static GLboolean
 697 any_pixel_transfer_ops(const struct st_context *st)
 698 {
 699    if (st->ctx->Pixel.RedScale != 1.0 ||
 700        st->ctx->Pixel.RedBias != 0.0 ||
 701        st->ctx->Pixel.GreenScale != 1.0 ||
 702        st->ctx->Pixel.GreenBias != 0.0 ||
 703        st->ctx->Pixel.BlueScale != 1.0 ||
 704        st->ctx->Pixel.BlueBias != 0.0 ||
 705        st->ctx->Pixel.AlphaScale != 1.0 ||
 706        st->ctx->Pixel.AlphaBias != 0.0 ||
 707        st->ctx->Pixel.MapColorFlag)
 708       /* XXX more checks */
 709       return GL_TRUE;
 710    else
 711       return GL_FALSE;
 712 }
 713
 714
 715 /**
 716  * Draw image with a blit, or other non-textured quad method.
 717  */
 718 static void
 719 draw_blit(struct st_context *st,
 720           GLsizei width, GLsizei height,
 721           GLenum format, GLenum type, const GLvoid *pixels)
 722 {
 723
 724
 725 }
 726
 727
 728 static void
 729 draw_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
 730                     GLsizei width, GLsizei height, GLenum type,
 731                     const struct gl_pixelstore_attrib *unpack,
 732                     const GLvoid *pixels)
 733 {
 734    struct st_context *st = ctx->st;
 735    struct pipe_context *pipe = st->pipe;
 736    struct pipe_screen *screen = pipe->screen;
 737    struct pipe_surface *ps = st->state.framebuffer.zsbuf;
 738    const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
 739    GLint skipPixels;
 740    ubyte *stmap;
 741
 742    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 743
 744    /* map the stencil buffer */
 745    stmap = screen->surface_map(screen, ps,
 746                                PIPE_BUFFER_USAGE_CPU_WRITE);
 747
 748    /* if width > MAX_WIDTH, have to process image in chunks */
 749    skipPixels = 0;
 750    while (skipPixels < width) {
 751       const GLint spanX = x + skipPixels;
 752       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 753       GLint row;
 754       for (row = 0; row < height; row++) {
 755          GLint spanY = y + row;
 756          GLubyte values[MAX_WIDTH];
 757          GLenum destType = GL_UNSIGNED_BYTE;
 758          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 759                                                       width, height,
 760                                                       GL_COLOR_INDEX, type,
 761                                                       row, skipPixels);
 762          _mesa_unpack_stencil_span(ctx, spanWidth, destType, values,
 763                                    type, source, unpack,
 764                                    ctx->_ImageTransferState);
 765          if (zoom) {
 766             /*
 767             _swrast_write_zoomed_stencil_span(ctx, x, y, spanWidth,
 768                                               spanX, spanY, values);
 769             */
 770          }
 771          else {
 772             if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 773                spanY = ctx->DrawBuffer->Height - spanY - 1;
 774             }
 775
 776             switch (ps->format) {
 777             case PIPE_FORMAT_U_S8:
 778                {
 779                   ubyte *dest = stmap + spanY * ps->pitch + spanX;
 780                   memcpy(dest, values, spanWidth);
 781                }
 782                break;
 783             case PIPE_FORMAT_S8Z24_UNORM:
 784                {
 785                   uint *dest = (uint *) stmap + spanY * ps->pitch + spanX;
 786                   GLint k;
 787                   for (k = 0; k < spanWidth; k++) {
 788                      uint p = dest[k];
 789                      p = (p & 0xffffff) | (values[k] << 24);
 790                      dest[k] = p;
 791                   }
 792                }
 793                break;
 794             default:
 795                assert(0);
 796             }
 797          }
 798       }
 799       skipPixels += spanWidth;
 800    }
 801
 802    /* unmap the stencil buffer */
 803    screen->surface_unmap(screen, ps);
 804 }
 805
 806
 807 /**
 808  * Called via ctx->Driver.DrawPixels()
 809  */
 810 static void
 811 st_DrawPixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 812               GLenum format, GLenum type,
 813               const struct gl_pixelstore_attrib *unpack, const GLvoid *pixels)
 814 {
 815    struct st_fragment_program *stfp;
 816    struct st_vertex_program *stvp;
 817    struct st_context *st = ctx->st;
 818    struct pipe_surface *ps;
 819    GLuint bufferFormat;
 820    const GLfloat *color;
 821
 822    if (format == GL_STENCIL_INDEX) {
 823       draw_stencil_pixels(ctx, x, y, width, height, type, unpack, pixels);
 824       return;
 825    }
 826
 827    st_validate_state(st);
 828
 829    if (format == GL_DEPTH_COMPONENT) {
 830       ps = st->state.framebuffer.zsbuf;
 831       stfp = make_fragment_shader_z(ctx->st);
 832       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_TRUE);
 833       color = ctx->Current.RasterColor;
 834    }
 835    else if (format == GL_STENCIL_INDEX) {
 836       ps = st->state.framebuffer.zsbuf;
 837       /* XXX special case - can't use texture map */
 838       color = NULL;
 839    }
 840    else {
 841       ps = st->state.framebuffer.cbufs[0];
 842       stfp = combined_drawpix_fragment_program(ctx);
 843       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_FALSE);
 844       color = NULL;
 845    }
 846
 847    bufferFormat = ps->format;
 848
 849    if (1/*any_fragment_ops(st) ||
 850        any_pixel_transfer_ops(st) ||
 851        !compatible_formats(format, type, ps->format)*/) {
 852       /* textured quad */
 853       struct pipe_texture *pt
 854          = make_texture(ctx->st, width, height, format, type, unpack, pixels);
 855       if (pt) {
 856          draw_textured_quad(ctx, x, y, ctx->Current.RasterPos[2],
 857                             width, height, ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,
 858                             pt, stvp, stfp, color, GL_FALSE);
 859          pipe_texture_reference(&pt, NULL);
 860       }
 861    }
 862    else {
 863       /* blit */
 864       draw_blit(st, width, height, format, type, pixels);
 865    }
 866 }
 867
 868
 869
 870 static void
 871 copy_stencil_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 872                     GLsizei width, GLsizei height,
 873                     GLint dstx, GLint dsty)
 874 {
 875    struct st_renderbuffer *rbDraw = st_renderbuffer(ctx->DrawBuffer->_StencilBuffer);
 876    struct pipe_screen *screen = ctx->st->pipe->screen;
 877    struct pipe_surface *psDraw = rbDraw->surface;
 878    ubyte *drawMap;
 879    ubyte *buffer;
 880    int i;
 881
 882    buffer = malloc(width * height * sizeof(ubyte));
 883    if (!buffer) {
 884       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels(stencil)");
 885       return;
 886    }
 887
 888    /* this will do stencil pixel transfer ops */
 889    st_read_stencil_pixels(ctx, srcx, srcy, width, height, GL_UNSIGNED_BYTE,
 890                           &ctx->DefaultPacking, buffer);
 891
 892    /* map the stencil buffer */
 893    drawMap = screen->surface_map(screen, psDraw, PIPE_BUFFER_USAGE_CPU_WRITE);
 894
 895    /* draw */
 896    /* XXX PixelZoom not handled yet */
 897    for (i = 0; i < height; i++) {
 898       ubyte *dst;
 899       const ubyte *src;
 900       int y;
 901
 902       y = dsty + i;
 903
 904       if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 905          y = ctx->DrawBuffer->Height - y - 1;
 906       }
 907
 908       dst = drawMap + (y * psDraw->pitch + dstx) * psDraw->cpp;
 909       src = buffer + i * width;
 910
 911       switch (psDraw->format) {
 912       case PIPE_FORMAT_S8Z24_UNORM:
 913          {
 914             uint *dst4 = (uint *) dst;
 915             int j;
 916             for (j = 0; j < width; j++) {
 917                *dst4 = (*dst4 & 0xffffff) | (src[j] << 24);
 918                dst4++;
 919             }
 920          }
 921          break;
 922       case PIPE_FORMAT_U_S8:
 923          memcpy(dst, src, width);
 924          break;
 925       default:
 926          assert(0);
 927       }
 928    }
 929
 930    free(buffer);
 931
 932    /* unmap the stencil buffer */
 933    screen->surface_unmap(screen, psDraw);
 934 }
 935
 936
 937 static void
 938 st_CopyPixels(GLcontext *ctx, GLint srcx, GLint srcy,
 939               GLsizei width, GLsizei height,
 940               GLint dstx, GLint dsty, GLenum type)
 941 {
 942    struct st_context *st = ctx->st;
 943    struct pipe_context *pipe = st->pipe;
 944    struct pipe_screen *screen = pipe->screen;
 945    struct st_renderbuffer *rbRead;
 946    struct st_vertex_program *stvp;
 947    struct st_fragment_program *stfp;
 948    struct pipe_surface *psRead;
 949    struct pipe_surface *psTex;
 950    struct pipe_texture *pt;
 951    GLfloat *color;
 952    enum pipe_format srcFormat, texFormat;
 953
 954    /* make sure rendering has completed */
 955    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 956
 957    st_validate_state(st);
 958
 959    if (type == GL_STENCIL) {
 960       /* can't use texturing to do stencil */
 961       copy_stencil_pixels(ctx, srcx, srcy, width, height, dstx, dsty);
 962       return;
 963    }
 964
 965    if (type == GL_COLOR) {
 966       rbRead = st_get_color_read_renderbuffer(ctx);
 967       color = NULL;
 968       stfp = combined_drawpix_fragment_program(ctx);
 969       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_FALSE);
 970    }
 971    else {
 972       assert(type == GL_DEPTH);
 973       rbRead = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
 974       color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 975       stfp = make_fragment_shader_z(ctx->st);
 976       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_TRUE);
 977    }
 978
 979    psRead = rbRead->surface;
 980    srcFormat = psRead->format;
 981
 982    if (screen->is_format_supported(screen, srcFormat, PIPE_TEXTURE)) {
 983       texFormat = srcFormat;
 984    }
 985    else {
 986       /* srcFormat can't be used as a texture format */
 987       if (type == GL_DEPTH) {
 988          texFormat = st_choose_format(pipe, GL_DEPTH_COMPONENT, PIPE_TEXTURE);
 989          assert(texFormat != PIPE_FORMAT_NONE); /* XXX no depth texture formats??? */
 990       }
 991       else {
 992          /* todo */
 993          assert(0);
 994       }
 995    }
 996
 997    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, texFormat, 0,
 998                           width, height, 1, 0,
 999                           PIPE_TEXTURE_USAGE_SAMPLER);
1000    if (!pt)
1001       return;
1002
1003    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
1004       srcy = ctx->DrawBuffer->Height - srcy - height;
1005    }
1006
1007    if (srcFormat == texFormat) {
1008       psTex = screen->get_tex_surface(screen, pt, 0, 0, 0,
1009                                       PIPE_BUFFER_USAGE_GPU_WRITE );
1010
1011       /* copy source framebuffer surface into mipmap/texture */
1012       pipe->surface_copy(pipe,
1013                          FALSE,
1014                          psTex, /* dest */
1015                          0, 0, /* destx/y */
1016                          psRead,
1017                          srcx, srcy, width, height);
1018    }
1019    else {
1020       psTex = screen->get_tex_surface(screen, pt, 0, 0, 0,
1021                                       PIPE_BUFFER_USAGE_CPU_WRITE );
1022
1023       if (type == GL_COLOR) {
1024          /* alternate path using get/put_tile() */
1025          GLfloat *buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
1026
1027          pipe_get_tile_rgba(pipe, psRead, srcx, srcy, width, height, buf);
1028          pipe_put_tile_rgba(pipe, psTex, 0, 0, width, height, buf);
1029
1030          free(buf);
1031       }
1032       else {
1033          /* GL_DEPTH */
1034          GLuint *buf = (GLuint *) malloc(width * height * sizeof(GLuint));
1035          pipe_get_tile_z(pipe, psRead, srcx, srcy, width, height, buf);
1036          pipe_put_tile_z(pipe, psTex, 0, 0, width, height, buf);
1037          free(buf);
1038       }
1039    }
1040
1041    pipe_surface_reference(&psTex, NULL);
1042
1043    /* draw textured quad */
1044    draw_textured_quad(ctx, dstx, dsty, ctx->Current.RasterPos[2],
1045                       width, height, ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,
1046                       pt, stvp, stfp, color, GL_TRUE);
1047
1048    pipe_texture_reference(&pt, NULL);
1049 }
1050
1051
1052
1053 void st_init_drawpixels_functions(struct dd_function_table *functions)
1054 {
1055    functions->DrawPixels = st_DrawPixels;
1056    functions->CopyPixels = st_CopyPixels;
1057 }