src/mesa/drivers/dri/i915/intel_pixel_bitmap.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 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 portionsalloc
  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 #include "glheader.h"
  29 #include "enums.h"
  30 #include "image.h"
  31 #include "colormac.h"
  32 #include "mtypes.h"
  33 #include "macros.h"
  34 #include "bufferobj.h"
  35 #include "swrast/swrast.h"
  36
  37 #include "intel_screen.h"
  38 #include "intel_context.h"
  39 #include "intel_ioctl.h"
  40 #include "intel_batchbuffer.h"
  41 #include "intel_blit.h"
  42 #include "intel_regions.h"
  43 #include "intel_buffer_objects.h"
  44
  45
  46
  47 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  48
  49
  50 /* Unlike the other intel_pixel_* functions, the expectation here is
  51  * that the incoming data is not in a PBO.  With the XY_TEXT blit
  52  * method, there's no benefit haveing it in a PBO, but we could
  53  * implement a path based on XY_MONO_SRC_COPY_BLIT which might benefit
  54  * PBO bitmaps.  I think they are probably pretty rare though - I
  55  * wonder if Xgl uses them?
  56  */
  57 static const GLubyte *map_pbo( GLcontext *ctx,
  58                                GLsizei width, GLsizei height,
  59                                const struct gl_pixelstore_attrib *unpack,
  60                                const GLubyte *bitmap )
  61 {
  62    GLubyte *buf;
  63
  64    if (!_mesa_validate_pbo_access(2, unpack, width, height, 1,
  65                                   GL_COLOR_INDEX, GL_BITMAP,
  66                                   (GLvoid *) bitmap)) {
  67       _mesa_error(ctx, GL_INVALID_OPERATION,"glBitmap(invalid PBO access)");
  68       return NULL;
  69    }
  70
  71    buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
  72                                            GL_READ_ONLY_ARB,
  73                                            unpack->BufferObj);
  74    if (!buf) {
  75       _mesa_error(ctx, GL_INVALID_OPERATION, "glBitmap(PBO is mapped)");
  76       return NULL;
  77    }
  78
  79    return ADD_POINTERS(buf, bitmap);
  80 }
  81
  82 static GLboolean test_bit( const GLubyte *src,
  83                             GLuint bit )
  84 {
  85    return (src[bit/8] & (1<<(bit % 8))) ? 1 : 0;
  86 }
  87
  88 static void set_bit( GLubyte *dest,
  89                           GLuint bit )
  90 {
  91    dest[bit/8] |= 1 << (bit % 8);
  92 }
  93
  94 static int align(int x, int align)
  95 {
  96    return (x + align - 1) & ~(align - 1);
  97 }
  98
  99 /* Extract a rectangle's worth of data from the bitmap.  Called
 100  * per-cliprect.
 101  */
 102 static GLuint get_bitmap_rect(GLsizei width, GLsizei height,
 103                               const struct gl_pixelstore_attrib *unpack,
 104                               const GLubyte *bitmap,
 105                               GLuint x, GLuint y,
 106                               GLuint w, GLuint h,
 107                               GLubyte *dest,
 108                               GLuint row_align,
 109                               GLboolean invert)
 110 {
 111    GLuint src_offset = (x + unpack->SkipPixels) & 0x7;
 112    GLuint mask = unpack->LsbFirst ? 0 : 7;
 113    GLuint bit = 0;
 114    GLint row, col;
 115    GLint first, last;
 116    GLint incr;
 117    GLuint count = 0;
 118
 119    if (INTEL_DEBUG & DEBUG_PIXEL)
 120       _mesa_printf("%s %d,%d %dx%d bitmap %dx%d skip %d src_offset %d mask %d\n",
 121                    __FUNCTION__, x,y,w,h,width,height,unpack->SkipPixels, src_offset, mask);
 122
 123    if (invert) {
 124       first = h-1;
 125       last = 0;
 126       incr = -1;
 127    }
 128    else {
 129       first = 0;
 130       last = h-1;
 131       incr = 1;
 132    }
 133
 134    /* Require that dest be pre-zero'd.
 135     */
 136    for (row = first; row != (last+incr); row += incr) {
 137       const GLubyte *rowsrc = _mesa_image_address2d(unpack, bitmap,
 138                                                     width, height,
 139                                                     GL_COLOR_INDEX, GL_BITMAP,
 140                                                     y + row, x);
 141
 142       for (col = 0; col < w; col++, bit++) {
 143          if (test_bit(rowsrc, (col + src_offset) ^ mask)) {
 144             set_bit(dest, bit ^ 7);
 145             count++;
 146          }
 147       }
 148
 149       if (row_align)
 150          bit = (bit + row_align - 1) & ~(row_align - 1);
 151    }
 152
 153    return count;
 154 }
 155
 156
 157
 158
 159 /*
 160  * Render a bitmap.
 161  */
 162 static GLboolean
 163 do_blit_bitmap( GLcontext *ctx,
 164                 GLint dstx, GLint dsty,
 165                 GLsizei width, GLsizei height,
 166                 const struct gl_pixelstore_attrib *unpack,
 167                 const GLubyte *bitmap )
 168 {
 169    struct intel_context *intel = intel_context(ctx);
 170    struct intel_region *dst = intel_drawbuf_region(intel);
 171
 172    union {
 173       GLuint ui;
 174       GLubyte ub[4];
 175    } color;
 176
 177
 178    if (unpack->BufferObj->Name) {
 179       bitmap = map_pbo(ctx, width, height, unpack, bitmap);
 180       if (bitmap == NULL)
 181          return GL_TRUE;        /* even though this is an error, we're done */
 182    }
 183
 184    UNCLAMPED_FLOAT_TO_CHAN(color.ub[0], ctx->Current.RasterColor[2]);
 185    UNCLAMPED_FLOAT_TO_CHAN(color.ub[1], ctx->Current.RasterColor[1]);
 186    UNCLAMPED_FLOAT_TO_CHAN(color.ub[2], ctx->Current.RasterColor[0]);
 187    UNCLAMPED_FLOAT_TO_CHAN(color.ub[3], ctx->Current.RasterColor[3]);
 188
 189    /* Does zoom apply to bitmaps?
 190     */
 191    if (!intel_check_blit_fragment_ops(ctx) ||
 192        ctx->Pixel.ZoomX != 1.0F ||
 193        ctx->Pixel.ZoomY != 1.0F)
 194       return GL_FALSE;
 195
 196    LOCK_HARDWARE(intel);
 197
 198    if (intel->driDrawable->numClipRects) {
 199       __DRIdrawablePrivate *dPriv = intel->driDrawable;
 200       drm_clip_rect_t *box = dPriv->pClipRects;
 201       drm_clip_rect_t dest_rect;
 202       GLint nbox = dPriv->numClipRects;
 203       GLint srcx = 0, srcy = 0;
 204       GLint orig_screen_x1, orig_screen_y2;
 205       GLuint i;
 206
 207
 208       orig_screen_x1 = dPriv->x + dstx;
 209       orig_screen_y2 = dPriv->y + (dPriv->h - dsty);
 210
 211       /* Do scissoring in GL coordinates:
 212        */
 213 x      if (ctx->Scissor.Enabled)
 214       {
 215          GLint x = ctx->Scissor.X;
 216          GLint y = ctx->Scissor.Y;
 217          GLuint w = ctx->Scissor.Width;
 218          GLuint h = ctx->Scissor.Height;
 219
 220          if (!_mesa_clip_to_region(x, y, x+w-1, y+h-1, &dstx, &dsty, &width, &height))
 221             goto out;
 222       }
 223
 224       /* Convert from GL to hardware coordinates:
 225        */
 226       dsty = dPriv->y + (dPriv->h - dsty - height);
 227       dstx = dPriv->x + dstx;
 228
 229       dest_rect.x1 = dstx;
 230       dest_rect.y1 = dsty;
 231       dest_rect.x2 = dstx + width;
 232       dest_rect.y2 = dsty + height;
 233
 234       for (i = 0; i < nbox; i++) {
 235          drm_clip_rect_t rect;
 236          int box_w, box_h;
 237          GLint px, py;
 238          GLuint stipple[32];
 239
 240          if (!intel_intersect_cliprects(&rect, &dest_rect, &box[i]))
 241             continue;
 242
 243          /* Now go back to GL coordinates to figure out what subset of
 244           * the bitmap we are uploading for this cliprect:
 245           */
 246          box_w = rect.x2 - rect.x1;
 247          box_h = rect.y2 - rect.y1;
 248          srcx = rect.x1 - orig_screen_x1;
 249          srcy = orig_screen_y2 - rect.y2;
 250
 251
 252 #define DY 32
 253 #define DX 32
 254
 255          /* Then, finally, chop it all into chunks that can be
 256           * digested by hardware:
 257           */
 258          for (py = 0; py < box_h; py += DY) {
 259             for (px = 0; px < box_w; px += DX) {
 260                int h = MIN2(DY, box_h - py);
 261                int w = MIN2(DX, box_w - px);
 262                GLuint sz = align(align(w,8) * h, 64)/8;
 263
 264                assert(sz <= sizeof(stipple));
 265                memset(stipple, 0, sz);
 266
 267                /* May need to adjust this when padding has been introduced in
 268                 * sz above:
 269                 */
 270                if (get_bitmap_rect(width, height, unpack,
 271                                    bitmap,
 272                                    srcx + px, srcy + py, w, h,
 273                                    (GLubyte *)stipple,
 274                                    8,
 275                                    GL_TRUE) == 0)
 276                   continue;
 277
 278                /*
 279                 */
 280                intelEmitImmediateColorExpandBlit( intel,
 281                                                   dst->cpp,
 282                                                   (GLubyte *)stipple,
 283                                                   sz,
 284                                                   color.ui,
 285                                                   dst->pitch,
 286                                                   dst->buffer,
 287                                                   0,
 288                                                   dst->tiled,
 289                                                   rect.x1 + px,
 290                                                   rect.y2 - (py + h),
 291                                                   w, h);
 292             }
 293          }
 294       }
 295       intel->need_flush = GL_TRUE;
 296    out:
 297       intel_batchbuffer_flush(intel->batch);
 298    }
 299    UNLOCK_HARDWARE(intel);
 300
 301
 302    if (unpack->BufferObj->Name) {
 303       /* done with PBO so unmap it now */
 304       ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
 305                               unpack->BufferObj);
 306    }
 307
 308    return GL_TRUE;
 309 }
 310
 311
 312
 313
 314
 315 /* There are a large number of possible ways to implement bitmap on
 316  * this hardware, most of them have some sort of drawback.  Here are a
 317  * few that spring to mind:
 318  *
 319  * Blit:
 320  *    - XY_MONO_SRC_BLT_CMD
 321  *         - use XY_SETUP_CLIP_BLT for cliprect clipping.
 322  *    - XY_TEXT_BLT
 323  *    - XY_TEXT_IMMEDIATE_BLT
 324  *         - blit per cliprect, subject to maximum immediate data size.
 325  *    - XY_COLOR_BLT
 326  *         - per pixel or run of pixels
 327  *    - XY_PIXEL_BLT
 328  *         - good for sparse bitmaps
 329  *
 330  * 3D engine:
 331  *    - Point per pixel
 332  *    - Translate bitmap to an alpha texture and render as a quad
 333  *    - Chop bitmap up into 32x32 squares and render w/polygon stipple.
 334  */
 335 void
 336 intelBitmap(GLcontext * ctx,
 337             GLint x, GLint y,
 338             GLsizei width, GLsizei height,
 339             const struct gl_pixelstore_attrib *unpack,
 340             const GLubyte * pixels)
 341 {
 342    if (do_blit_bitmap(ctx, x, y, width, height,
 343                           unpack, pixels))
 344       return;
 345
 346    if (INTEL_DEBUG & DEBUG_PIXEL)
 347       _mesa_printf("%s: fallback to swrast\n", __FUNCTION__);
 348
 349    _swrast_Bitmap(ctx, x, y, width, height, unpack, pixels);
 350 }