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    struct gl_program *p;
 168    GLuint ic = 0;
 169
 170    if (st->drawpix.z_shader) {
 171       return st->drawpix.z_shader;
 172    }
 173
 174    /*
 175     * Create shader now
 176     */
 177    p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 178    if (!p)
 179       return NULL;
 180
 181    p->NumInstructions = 3;
 182
 183    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 184    if (!p->Instructions) {
 185       ctx->Driver.DeleteProgram(ctx, p);
 186       return NULL;
 187    }
 188    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 189
 190    /* TEX result.depth, fragment.texcoord[0], texture[0], 2D; */
 191    p->Instructions[ic].Opcode = OPCODE_TEX;
 192    p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
 193    p->Instructions[ic].DstReg.Index = FRAG_RESULT_DEPR;
 194    p->Instructions[ic].DstReg.WriteMask = WRITEMASK_Z;
 195    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 196    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 197    p->Instructions[ic].TexSrcUnit = 0;
 198    p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 199    ic++;
 200
 201    /* MOV result.color, fragment.color */
 202    p->Instructions[ic].Opcode = OPCODE_MOV;
 203    p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
 204    p->Instructions[ic].DstReg.Index = FRAG_RESULT_COLR;
 205    p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 206    p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_COL0;
 207    ic++;
 208
 209    /* END; */
 210    p->Instructions[ic++].Opcode = OPCODE_END;
 211
 212    assert(ic == p->NumInstructions);
 213
 214    p->InputsRead = FRAG_BIT_TEX0 | FRAG_BIT_COL0;
 215    p->OutputsWritten = (1 << FRAG_RESULT_COLR) | (1 << FRAG_RESULT_DEPR);
 216    p->SamplersUsed = 0x1;  /* sampler 0 (bit 0) is used */
 217
 218    st->drawpix.z_shader = (struct st_fragment_program *) p;
 219    st_translate_fragment_program(st, st->drawpix.z_shader, NULL);
 220
 221    return st->drawpix.z_shader;
 222 }
 223
 224
 225
 226 /**
 227  * Create a simple vertex shader that just passes through the
 228  * vertex position and texcoord (and optionally, color).
 229  */
 230 static struct st_vertex_program *
 231 st_make_passthrough_vertex_shader(struct st_context *st, GLboolean passColor)
 232 {
 233    GLcontext *ctx = st->ctx;
 234    struct st_vertex_program *stvp;
 235    struct gl_program *p;
 236    GLuint ic = 0;
 237
 238    if (st->drawpix.vert_shaders[passColor])
 239       return st->drawpix.vert_shaders[passColor];
 240
 241    /*
 242     * Create shader now
 243     */
 244    p = ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
 245    if (!p)
 246       return NULL;
 247
 248    if (passColor)
 249       p->NumInstructions = 4;
 250    else
 251       p->NumInstructions = 3;
 252
 253    p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
 254    if (!p->Instructions) {
 255       ctx->Driver.DeleteProgram(ctx, p);
 256       return NULL;
 257    }
 258    _mesa_init_instructions(p->Instructions, p->NumInstructions);
 259    /* MOV result.pos, vertex.pos; */
 260    p->Instructions[0].Opcode = OPCODE_MOV;
 261    p->Instructions[0].DstReg.File = PROGRAM_OUTPUT;
 262    p->Instructions[0].DstReg.Index = VERT_RESULT_HPOS;
 263    p->Instructions[0].SrcReg[0].File = PROGRAM_INPUT;
 264    p->Instructions[0].SrcReg[0].Index = VERT_ATTRIB_POS;
 265    /* MOV result.texcoord0, vertex.texcoord0; */
 266    p->Instructions[1].Opcode = OPCODE_MOV;
 267    p->Instructions[1].DstReg.File = PROGRAM_OUTPUT;
 268    p->Instructions[1].DstReg.Index = VERT_RESULT_TEX0;
 269    p->Instructions[1].SrcReg[0].File = PROGRAM_INPUT;
 270    p->Instructions[1].SrcReg[0].Index = VERT_ATTRIB_TEX0;
 271    ic = 2;
 272    if (passColor) {
 273       /* MOV result.color0, vertex.color0; */
 274       p->Instructions[ic].Opcode = OPCODE_MOV;
 275       p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
 276       p->Instructions[ic].DstReg.Index = VERT_RESULT_COL0;
 277       p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
 278       p->Instructions[ic].SrcReg[0].Index = VERT_ATTRIB_COLOR0;
 279       ic++;
 280    }
 281
 282    /* END; */
 283    p->Instructions[ic].Opcode = OPCODE_END;
 284    ic++;
 285
 286    assert(ic == p->NumInstructions);
 287
 288    p->InputsRead = VERT_BIT_POS | VERT_BIT_TEX0;
 289    p->OutputsWritten = ((1 << VERT_RESULT_TEX0) |
 290                         (1 << VERT_RESULT_HPOS));
 291    if (passColor) {
 292       p->InputsRead |= VERT_BIT_COLOR0;
 293       p->OutputsWritten |= (1 << VERT_RESULT_COL0);
 294    }
 295
 296    stvp = (struct st_vertex_program *) p;
 297    st_translate_vertex_program(st, stvp, NULL);
 298
 299    st->drawpix.vert_shaders[passColor] = stvp;
 300
 301    return stvp;
 302 }
 303
 304
 305 static GLenum
 306 _mesa_base_format(GLenum format)
 307 {
 308    switch (format) {
 309    case GL_DEPTH_COMPONENT:
 310       return GL_DEPTH_COMPONENT;
 311    case GL_STENCIL_INDEX:
 312       return GL_STENCIL_INDEX;
 313    default:
 314       return GL_RGBA;
 315    }
 316 }
 317
 318
 319 /**
 320  * Make texture containing an image for glDrawPixels image.
 321  * If 'pixels' is NULL, leave the texture image data undefined.
 322  */
 323 static struct pipe_texture *
 324 make_texture(struct st_context *st,
 325              GLsizei width, GLsizei height, GLenum format, GLenum type,
 326              const struct gl_pixelstore_attrib *unpack,
 327              const GLvoid *pixels)
 328 {
 329    GLcontext *ctx = st->ctx;
 330    struct pipe_context *pipe = st->pipe;
 331    struct pipe_screen *screen = pipe->screen;
 332    const struct gl_texture_format *mformat;
 333    struct pipe_texture *pt;
 334    enum pipe_format pipeFormat;
 335    GLuint cpp;
 336    GLenum baseFormat;
 337
 338    baseFormat = _mesa_base_format(format);
 339
 340    mformat = st_ChooseTextureFormat(ctx, baseFormat, format, type);
 341    assert(mformat);
 342
 343    pipeFormat = st_mesa_format_to_pipe_format(mformat->MesaFormat);
 344    assert(pipeFormat);
 345    cpp = st_sizeof_format(pipeFormat);
 346
 347    pixels = _mesa_map_drawpix_pbo(ctx, unpack, pixels);
 348    if (!pixels)
 349       return NULL;
 350
 351    pt = st_texture_create(st, PIPE_TEXTURE_2D, pipeFormat, 0, width, height,
 352                           1, 0);
 353    if (!pt) {
 354       _mesa_unmap_drawpix_pbo(ctx, unpack);
 355       return NULL;
 356    }
 357
 358    {
 359       struct pipe_surface *surface;
 360       static const GLuint dstImageOffsets = 0;
 361       GLboolean success;
 362       GLubyte *dest;
 363       const GLbitfield imageTransferStateSave = ctx->_ImageTransferState;
 364
 365       /* we'll do pixel transfer in a fragment shader */
 366       ctx->_ImageTransferState = 0x0;
 367
 368       surface = screen->get_tex_surface(screen, pt, 0, 0, 0);
 369
 370       /* map texture surface */
 371       dest = pipe_surface_map(surface);
 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       pipe_surface_unmap(surface);
 391       pipe_surface_reference(&surface, NULL);
 392       pipe->texture_update(pipe, pt, 0, 0x1);
 393
 394       assert(success);
 395
 396       /* restore */
 397       ctx->_ImageTransferState = imageTransferStateSave;
 398    }
 399
 400    _mesa_unmap_drawpix_pbo(ctx, unpack);
 401
 402    return pt;
 403 }
 404
 405
 406 /**
 407  * Draw quad with texcoords and optional color.
 408  * Coords are window coords with y=0=bottom.
 409  * \param color  may be null
 410  * \param invertTex  if true, flip texcoords vertically
 411  */
 412 static void
 413 draw_quad(GLcontext *ctx, GLfloat x0, GLfloat y0, GLfloat z,
 414           GLfloat x1, GLfloat y1, const GLfloat *color,
 415           GLboolean invertTex)
 416 {
 417    struct st_context *st = ctx->st;
 418    struct pipe_context *pipe = ctx->st->pipe;
 419    GLfloat verts[4][3][4]; /* four verts, three attribs, XYZW */
 420
 421    /* setup vertex data */
 422    {
 423       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 424       const GLfloat fb_width = fb->Width;
 425       const GLfloat fb_height = fb->Height;
 426       const GLfloat clip_x0 = x0 / fb_width * 2.0 - 1.0;
 427       const GLfloat clip_y0 = y0 / fb_height * 2.0 - 1.0;
 428       const GLfloat clip_x1 = x1 / fb_width * 2.0 - 1.0;
 429       const GLfloat clip_y1 = y1 / fb_height * 2.0 - 1.0;
 430       const GLfloat sLeft = 0.0F, sRight = 1.0F;
 431       const GLfloat tTop = invertTex, tBot = 1.0 - tTop;
 432       GLuint tex, i;
 433
 434       /* upper-left */
 435       verts[0][0][0] = clip_x0;    /* v[0].attr[0].x */
 436       verts[0][0][1] = clip_y0;    /* v[0].attr[0].y */
 437
 438       /* upper-right */
 439       verts[1][0][0] = clip_x1;
 440       verts[1][0][1] = clip_y0;
 441
 442       /* lower-right */
 443       verts[2][0][0] = clip_x1;
 444       verts[2][0][1] = clip_y1;
 445
 446       /* lower-left */
 447       verts[3][0][0] = clip_x0;
 448       verts[3][0][1] = clip_y1;
 449
 450       tex = color ? 2 : 1;
 451       verts[0][tex][0] = sLeft; /* v[0].attr[tex].s */
 452       verts[0][tex][1] = tTop;  /* v[0].attr[tex].t */
 453       verts[1][tex][0] = sRight;
 454       verts[1][tex][1] = tTop;
 455       verts[2][tex][0] = sRight;
 456       verts[2][tex][1] = tBot;
 457       verts[3][tex][0] = sLeft;
 458       verts[3][tex][1] = tBot;
 459
 460       /* same for all verts: */
 461       if (color) {
 462          for (i = 0; i < 4; i++) {
 463             verts[i][0][2] = z;   /*Z*/
 464             verts[i][0][3] = 1.0; /*W*/
 465             verts[i][1][0] = color[0];
 466             verts[i][1][1] = color[1];
 467             verts[i][1][2] = color[2];
 468             verts[i][1][3] = color[3];
 469             verts[i][2][2] = 0.0; /*R*/
 470             verts[i][2][3] = 1.0; /*Q*/
 471          }
 472       }
 473       else {
 474          for (i = 0; i < 4; i++) {
 475             verts[i][0][2] = z;   /*Z*/
 476             verts[i][0][3] = 1.0; /*W*/
 477             verts[i][1][2] = 0.0; /*R*/
 478             verts[i][1][3] = 1.0; /*Q*/
 479          }
 480       }
 481    }
 482
 483    {
 484       struct pipe_buffer *buf;
 485       ubyte *map;
 486
 487       /* allocate/load buffer object with vertex data */
 488       buf = pipe_buffer_create(pipe,32, PIPE_BUFFER_USAGE_VERTEX,
 489                                sizeof(verts));
 490       map = pipe_buffer_map(pipe, buf, PIPE_BUFFER_USAGE_CPU_WRITE);
 491       memcpy(map, verts, sizeof(verts));
 492       pipe_buffer_unmap(pipe, buf);
 493
 494       util_draw_vertex_buffer(pipe, buf,
 495                               PIPE_PRIM_QUADS,
 496                               4,  /* verts */
 497                               3); /* attribs/vert */
 498
 499       pipe_buffer_destroy(pipe, buf);
 500    }
 501 }
 502
 503
 504
 505 static void
 506 draw_textured_quad(GLcontext *ctx, GLint x, GLint y, GLfloat z,
 507                    GLsizei width, GLsizei height,
 508                    GLfloat zoomX, GLfloat zoomY,
 509                    struct pipe_texture *pt,
 510                    struct st_vertex_program *stvp,
 511                    struct st_fragment_program *stfp,
 512                    const GLfloat *color,
 513                    GLboolean invertTex)
 514 {
 515    struct st_context *st = ctx->st;
 516    struct pipe_context *pipe = ctx->st->pipe;
 517    struct cso_context *cso = ctx->st->cso_context;
 518    GLfloat x0, y0, x1, y1;
 519    GLuint maxSize;
 520
 521    /* limit checks */
 522    /* XXX if DrawPixels image is larger than max texture size, break
 523     * it up into chunks.
 524     */
 525    maxSize = 1 << (pipe->screen->get_param(pipe->screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
 526    assert(width <= maxSize);
 527    assert(height <= maxSize);
 528
 529    cso_save_rasterizer(cso);
 530    cso_save_viewport(cso);
 531    cso_save_samplers(cso);
 532    cso_save_sampler_textures(cso);
 533    cso_save_fragment_shader(cso);
 534    cso_save_vertex_shader(cso);
 535
 536    /* rasterizer state: just scissor */
 537    {
 538       struct pipe_rasterizer_state rasterizer;
 539       memset(&rasterizer, 0, sizeof(rasterizer));
 540       rasterizer.gl_rasterization_rules = 1;
 541       rasterizer.scissor = ctx->Scissor.Enabled;
 542       cso_set_rasterizer(cso, &rasterizer);
 543    }
 544
 545    /* fragment shader state: TEX lookup program */
 546    cso_set_fragment_shader_handle(cso, stfp->driver_shader);
 547
 548    /* vertex shader state: position + texcoord pass-through */
 549    cso_set_vertex_shader_handle(cso, stvp->driver_shader);
 550
 551
 552    /* texture sampling state: */
 553    {
 554       struct pipe_sampler_state sampler;
 555       memset(&sampler, 0, sizeof(sampler));
 556       sampler.wrap_s = PIPE_TEX_WRAP_CLAMP;
 557       sampler.wrap_t = PIPE_TEX_WRAP_CLAMP;
 558       sampler.wrap_r = PIPE_TEX_WRAP_CLAMP;
 559       sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 560       sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 561       sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 562       sampler.normalized_coords = 1;
 563
 564       cso_single_sampler(cso, 0, &sampler);
 565       if (st->pixel_xfer.pixelmap_enabled) {
 566          cso_single_sampler(cso, 1, &sampler);
 567       }
 568       cso_single_sampler_done(cso);
 569    }
 570
 571    /* viewport state: viewport matching window dims */
 572    {
 573       const float width = ctx->DrawBuffer->Width;
 574       const float height = ctx->DrawBuffer->Height;
 575       struct pipe_viewport_state vp;
 576       vp.scale[0] =  0.5 * width;
 577       vp.scale[1] = -0.5 * height;
 578       vp.scale[2] = 1.0;
 579       vp.scale[3] = 1.0;
 580       vp.translate[0] = 0.5 * width;
 581       vp.translate[1] = 0.5 * height;
 582       vp.translate[2] = 0.0;
 583       vp.translate[3] = 0.0;
 584       cso_set_viewport(cso, &vp);
 585    }
 586
 587    /* texture state: */
 588    if (st->pixel_xfer.pixelmap_enabled) {
 589       struct pipe_texture *textures[2];
 590       textures[0] = pt;
 591       textures[1] = st->pixel_xfer.pixelmap_texture;
 592       pipe->set_sampler_textures(pipe, 2, textures);
 593    }
 594    else {
 595       pipe->set_sampler_textures(pipe, 1, &pt);
 596    }
 597
 598    /* Compute window coords (y=0=bottom) with pixel zoom.
 599     * Recall that these coords are transformed by the current
 600     * vertex shader and viewport transformation.
 601     */
 602    x0 = x;
 603    x1 = x + width * ctx->Pixel.ZoomX;
 604    y0 = y;
 605    y1 = y + height * ctx->Pixel.ZoomY;
 606    draw_quad(ctx, x0, y0, z, x1, y1, color, invertTex);
 607
 608    /* restore state */
 609    cso_restore_rasterizer(cso);
 610    cso_restore_viewport(cso);
 611    cso_restore_samplers(cso);
 612    cso_restore_sampler_textures(cso);
 613    cso_restore_fragment_shader(cso);
 614    cso_restore_vertex_shader(cso);
 615 }
 616
 617
 618 /**
 619  * Check if a GL format/type combination is a match to the given pipe format.
 620  * XXX probably move this to a re-usable place.
 621  */
 622 static GLboolean
 623 compatible_formats(GLenum format, GLenum type, enum pipe_format pipeFormat)
 624 {
 625    static const GLuint one = 1;
 626    GLubyte littleEndian = *((GLubyte *) &one);
 627
 628    if (pipeFormat == PIPE_FORMAT_R8G8B8A8_UNORM &&
 629        format == GL_RGBA &&
 630        type == GL_UNSIGNED_BYTE &&
 631        !littleEndian) {
 632       return GL_TRUE;
 633    }
 634    else if (pipeFormat == PIPE_FORMAT_R8G8B8A8_UNORM &&
 635             format == GL_ABGR_EXT &&
 636             type == GL_UNSIGNED_BYTE &&
 637             littleEndian) {
 638       return GL_TRUE;
 639    }
 640    else if (pipeFormat == PIPE_FORMAT_A8R8G8B8_UNORM &&
 641             format == GL_BGRA &&
 642             type == GL_UNSIGNED_BYTE &&
 643             littleEndian) {
 644       return GL_TRUE;
 645    }
 646    else if (pipeFormat == PIPE_FORMAT_R5G6B5_UNORM &&
 647             format == GL_RGB &&
 648             type == GL_UNSIGNED_SHORT_5_6_5) {
 649       /* endian don't care */
 650       return GL_TRUE;
 651    }
 652    else if (pipeFormat == PIPE_FORMAT_R5G6B5_UNORM &&
 653             format == GL_BGR &&
 654             type == GL_UNSIGNED_SHORT_5_6_5_REV) {
 655       /* endian don't care */
 656       return GL_TRUE;
 657    }
 658    else if (pipeFormat == PIPE_FORMAT_S8_UNORM &&
 659             format == GL_STENCIL_INDEX &&
 660             type == GL_UNSIGNED_BYTE) {
 661       return GL_TRUE;
 662    }
 663    else if (pipeFormat == PIPE_FORMAT_Z32_UNORM &&
 664             format == GL_DEPTH_COMPONENT &&
 665             type == GL_UNSIGNED_INT) {
 666       return GL_TRUE;
 667    }
 668    /* XXX add more cases */
 669    else {
 670       return GL_FALSE;
 671    }
 672 }
 673
 674
 675 /**
 676  * Check if any per-fragment ops are enabled.
 677  * XXX probably move this to a re-usable place.
 678  */
 679 static GLboolean
 680 any_fragment_ops(const struct st_context *st)
 681 {
 682    if (st->state.depth_stencil.alpha.enabled ||
 683        st->state.depth_stencil.depth.enabled ||
 684        st->state.blend.blend_enable ||
 685        st->state.blend.logicop_enable)
 686       /* XXX more checks */
 687       return GL_TRUE;
 688    else
 689       return GL_FALSE;
 690 }
 691
 692
 693 /**
 694  * Check if any pixel transfer ops are enabled.
 695  * XXX probably move this to a re-usable place.
 696  */
 697 static GLboolean
 698 any_pixel_transfer_ops(const struct st_context *st)
 699 {
 700    if (st->ctx->Pixel.RedScale != 1.0 ||
 701        st->ctx->Pixel.RedBias != 0.0 ||
 702        st->ctx->Pixel.GreenScale != 1.0 ||
 703        st->ctx->Pixel.GreenBias != 0.0 ||
 704        st->ctx->Pixel.BlueScale != 1.0 ||
 705        st->ctx->Pixel.BlueBias != 0.0 ||
 706        st->ctx->Pixel.AlphaScale != 1.0 ||
 707        st->ctx->Pixel.AlphaBias != 0.0 ||
 708        st->ctx->Pixel.MapColorFlag)
 709       /* XXX more checks */
 710       return GL_TRUE;
 711    else
 712       return GL_FALSE;
 713 }
 714
 715
 716 /**
 717  * Draw image with a blit, or other non-textured quad method.
 718  */
 719 static void
 720 draw_blit(struct st_context *st,
 721           GLsizei width, GLsizei height,
 722           GLenum format, GLenum type, const GLvoid *pixels)
 723 {
 724
 725
 726 }
 727
 728
 729 static void
 730 draw_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
 731                     GLsizei width, GLsizei height, GLenum type,
 732                     const struct gl_pixelstore_attrib *unpack,
 733                     const GLvoid *pixels)
 734 {
 735    struct st_context *st = ctx->st;
 736    struct pipe_context *pipe = st->pipe;
 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 = pipe_surface_map(ps);
 746
 747    /* if width > MAX_WIDTH, have to process image in chunks */
 748    skipPixels = 0;
 749    while (skipPixels < width) {
 750       const GLint spanX = x + skipPixels;
 751       const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
 752       GLint row;
 753       for (row = 0; row < height; row++) {
 754          GLint spanY = y + row;
 755          GLubyte values[MAX_WIDTH];
 756          GLenum destType = GL_UNSIGNED_BYTE;
 757          const GLvoid *source = _mesa_image_address2d(unpack, pixels,
 758                                                       width, height,
 759                                                       GL_COLOR_INDEX, type,
 760                                                       row, skipPixels);
 761          _mesa_unpack_stencil_span(ctx, spanWidth, destType, values,
 762                                    type, source, unpack,
 763                                    ctx->_ImageTransferState);
 764          if (zoom) {
 765             /*
 766             _swrast_write_zoomed_stencil_span(ctx, x, y, spanWidth,
 767                                               spanX, spanY, values);
 768             */
 769          }
 770          else {
 771             if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 772                spanY = ctx->DrawBuffer->Height - spanY - 1;
 773             }
 774
 775             switch (ps->format) {
 776             case PIPE_FORMAT_S8_UNORM:
 777                {
 778                   ubyte *dest = stmap + spanY * ps->pitch + spanX;
 779                   memcpy(dest, values, spanWidth);
 780                }
 781                break;
 782             case PIPE_FORMAT_S8Z24_UNORM:
 783                {
 784                   uint *dest = (uint *) stmap + spanY * ps->pitch + spanX;
 785                   GLint k;
 786                   for (k = 0; k < spanWidth; k++) {
 787                      uint p = dest[k];
 788                      p = (p & 0xffffff) | (values[k] << 24);
 789                      dest[k] = p;
 790                   }
 791                }
 792                break;
 793             default:
 794                assert(0);
 795             }
 796          }
 797       }
 798       skipPixels += spanWidth;
 799    }
 800
 801    /* unmap the stencil buffer */
 802    pipe_surface_unmap(ps);
 803 }
 804
 805
 806 /**
 807  * Called via ctx->Driver.DrawPixels()
 808  */
 809 static void
 810 st_DrawPixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height,
 811               GLenum format, GLenum type,
 812               const struct gl_pixelstore_attrib *unpack, const GLvoid *pixels)
 813 {
 814    struct st_fragment_program *stfp;
 815    struct st_vertex_program *stvp;
 816    struct st_context *st = ctx->st;
 817    struct pipe_surface *ps;
 818    GLuint bufferFormat;
 819    const GLfloat *color;
 820
 821    if (format == GL_STENCIL_INDEX) {
 822       draw_stencil_pixels(ctx, x, y, width, height, type, unpack, pixels);
 823       return;
 824    }
 825
 826    st_validate_state(st);
 827
 828    if (format == GL_DEPTH_COMPONENT) {
 829       ps = st->state.framebuffer.zsbuf;
 830       stfp = make_fragment_shader_z(ctx->st);
 831       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_TRUE);
 832       color = ctx->Current.RasterColor;
 833    }
 834    else if (format == GL_STENCIL_INDEX) {
 835       ps = st->state.framebuffer.zsbuf;
 836       /* XXX special case - can't use texture map */
 837       color = NULL;
 838    }
 839    else {
 840       ps = st->state.framebuffer.cbufs[0];
 841       stfp = combined_drawpix_fragment_program(ctx);
 842       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_FALSE);
 843       color = NULL;
 844    }
 845
 846    bufferFormat = ps->format;
 847
 848    if (1/*any_fragment_ops(st) ||
 849        any_pixel_transfer_ops(st) ||
 850        !compatible_formats(format, type, ps->format)*/) {
 851       /* textured quad */
 852       struct pipe_texture *pt
 853          = make_texture(ctx->st, width, height, format, type, unpack, pixels);
 854       if (pt) {
 855          draw_textured_quad(ctx, x, y, ctx->Current.RasterPos[2],
 856                             width, height, ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,
 857                             pt, stvp, stfp, color, GL_FALSE);
 858          pipe_texture_reference(&pt, NULL);
 859       }
 860    }
 861    else {
 862       /* blit */
 863       draw_blit(st, width, height, format, type, pixels);
 864    }
 865 }
 866
 867
 868
 869 static void
 870 copy_stencil_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 871                     GLsizei width, GLsizei height,
 872                     GLint dstx, GLint dsty)
 873 {
 874    struct st_renderbuffer *rbDraw = st_renderbuffer(ctx->DrawBuffer->_StencilBuffer);
 875    struct pipe_surface *psDraw = rbDraw->surface;
 876    ubyte *drawMap;
 877    ubyte *buffer;
 878    int i;
 879
 880    buffer = malloc(width * height * sizeof(ubyte));
 881    if (!buffer) {
 882       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels(stencil)");
 883       return;
 884    }
 885
 886    /* this will do stencil pixel transfer ops */
 887    st_read_stencil_pixels(ctx, srcx, srcy, width, height, GL_UNSIGNED_BYTE,
 888                           &ctx->DefaultPacking, buffer);
 889
 890    /* map the stencil buffer */
 891    drawMap = pipe_surface_map(psDraw);
 892
 893    /* draw */
 894    /* XXX PixelZoom not handled yet */
 895    for (i = 0; i < height; i++) {
 896       ubyte *dst;
 897       const ubyte *src;
 898       int y;
 899
 900       y = dsty + i;
 901
 902       if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
 903          y = ctx->DrawBuffer->Height - y - 1;
 904       }
 905
 906       dst = drawMap + (y * psDraw->pitch + dstx) * psDraw->cpp;
 907       src = buffer + i * width;
 908
 909       switch (psDraw->format) {
 910       case PIPE_FORMAT_S8Z24_UNORM:
 911          {
 912             uint *dst4 = (uint *) dst;
 913             int j;
 914             for (j = 0; j < width; j++) {
 915                *dst4 = (*dst4 & 0xffffff) | (src[j] << 24);
 916                dst4++;
 917             }
 918          }
 919          break;
 920       case PIPE_FORMAT_S8_UNORM:
 921          memcpy(dst, src, width);
 922          break;
 923       default:
 924          assert(0);
 925       }
 926    }
 927
 928    free(buffer);
 929
 930    /* unmap the stencil buffer */
 931    pipe_surface_unmap(psDraw);
 932 }
 933
 934
 935 static void
 936 st_CopyPixels(GLcontext *ctx, GLint srcx, GLint srcy,
 937               GLsizei width, GLsizei height,
 938               GLint dstx, GLint dsty, GLenum type)
 939 {
 940    struct st_context *st = ctx->st;
 941    struct pipe_context *pipe = st->pipe;
 942    struct pipe_screen *screen = pipe->screen;
 943    struct st_renderbuffer *rbRead;
 944    struct st_vertex_program *stvp;
 945    struct st_fragment_program *stfp;
 946    struct pipe_surface *psRead;
 947    struct pipe_surface *psTex;
 948    struct pipe_texture *pt;
 949    GLfloat *color;
 950    enum pipe_format srcFormat, texFormat;
 951
 952    /* make sure rendering has completed */
 953    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 954
 955    st_validate_state(st);
 956
 957    if (type == GL_STENCIL) {
 958       /* can't use texturing to do stencil */
 959       copy_stencil_pixels(ctx, srcx, srcy, width, height, dstx, dsty);
 960       return;
 961    }
 962
 963    if (type == GL_COLOR) {
 964       rbRead = st_get_color_read_renderbuffer(ctx);
 965       color = NULL;
 966       stfp = combined_drawpix_fragment_program(ctx);
 967       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_FALSE);
 968    }
 969    else {
 970       assert(type == GL_DEPTH);
 971       rbRead = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
 972       color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 973       stfp = make_fragment_shader_z(ctx->st);
 974       stvp = st_make_passthrough_vertex_shader(ctx->st, GL_TRUE);
 975    }
 976
 977    psRead = rbRead->surface;
 978    srcFormat = psRead->format;
 979
 980    if (screen->is_format_supported(screen, srcFormat, PIPE_TEXTURE)) {
 981       texFormat = srcFormat;
 982    }
 983    else {
 984       /* srcFormat can't be used as a texture format */
 985       if (type == GL_DEPTH) {
 986          texFormat = st_choose_format(pipe, GL_DEPTH_COMPONENT, PIPE_TEXTURE);
 987          assert(texFormat != PIPE_FORMAT_NONE); /* XXX no depth texture formats??? */
 988       }
 989       else {
 990          /* todo */
 991          assert(0);
 992       }
 993    }
 994
 995    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, texFormat, 0,
 996                           width, height, 1, 0);
 997    if (!pt)
 998       return;
 999
1000    psTex = screen->get_tex_surface(screen, pt, 0, 0, 0);
1001
1002    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
1003       srcy = ctx->DrawBuffer->Height - srcy - height;
1004    }
1005
1006    if (srcFormat == texFormat) {
1007       /* copy source framebuffer surface into mipmap/texture */
1008       pipe->surface_copy(pipe,
1009                          FALSE,
1010                          psTex, /* dest */
1011                          0, 0, /* destx/y */
1012                          psRead,
1013                          srcx, srcy, width, height);
1014    }
1015    else if (type == GL_COLOR) {
1016       /* alternate path using get/put_tile() */
1017       GLfloat *buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
1018
1019       pipe_get_tile_rgba(pipe, psRead, srcx, srcy, width, height, buf);
1020       pipe_put_tile_rgba(pipe, psTex, 0, 0, width, height, buf);
1021
1022       free(buf);
1023    }
1024    else {
1025       /* GL_DEPTH */
1026       GLuint *buf = (GLuint *) malloc(width * height * sizeof(GLuint));
1027       pipe_get_tile_z(pipe, psRead, srcx, srcy, width, height, buf);
1028       pipe_put_tile_z(pipe, psTex, 0, 0, width, height, buf);
1029       free(buf);
1030    }
1031
1032    /* draw textured quad */
1033    draw_textured_quad(ctx, dstx, dsty, ctx->Current.RasterPos[2],
1034                       width, height, ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,
1035                       pt, stvp, stfp, color, GL_TRUE);
1036
1037    pipe_surface_reference(&psTex, NULL);
1038    pipe_texture_reference(&pt, NULL);
1039 }
1040
1041
1042
1043 void st_init_drawpixels_functions(struct dd_function_table *functions)
1044 {
1045    functions->DrawPixels = st_DrawPixels;
1046    functions->CopyPixels = st_CopyPixels;
1047 }
1048
1049
1050 void
1051 st_destroy_drawpix(struct st_context *st)
1052 {
1053    st_reference_fragprog(st, &st->drawpix.z_shader, NULL);
1054    st_reference_fragprog(st, &st->pixel_xfer.combined_prog, NULL);
1055    st_reference_vertprog(st, &st->drawpix.vert_shaders[0], NULL);
1056    st_reference_vertprog(st, &st->drawpix.vert_shaders[1], NULL);
1057 }
1058
1059