src/mesa/drivers/dri/intel/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 "main/glheader.h"
  29 #include "main/enums.h"
  30 #include "main/image.h"
  31 #include "main/colormac.h"
  32 #include "main/mtypes.h"
  33 #include "main/macros.h"
  34 #include "main/bufferobj.h"
  35 #include "main/polygon.h"
  36 #include "main/state.h"
  37 #include "main/texobj.h"
  38 #include "main/context.h"
  39 #include "swrast/swrast.h"
  40 #include "drivers/common/meta.h"
  41
  42 #include "intel_screen.h"
  43 #include "intel_context.h"
  44 #include "intel_batchbuffer.h"
  45 #include "intel_blit.h"
  46 #include "intel_regions.h"
  47 #include "intel_buffers.h"
  48 #include "intel_pixel.h"
  49 #include "intel_reg.h"
  50
  51
  52 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  53
  54
  55 /* Unlike the other intel_pixel_* functions, the expectation here is
  56  * that the incoming data is not in a PBO.  With the XY_TEXT blit
  57  * method, there's no benefit haveing it in a PBO, but we could
  58  * implement a path based on XY_MONO_SRC_COPY_BLIT which might benefit
  59  * PBO bitmaps.  I think they are probably pretty rare though - I
  60  * wonder if Xgl uses them?
  61  */
  62 static const GLubyte *map_pbo( GLcontext *ctx,
  63                                GLsizei width, GLsizei height,
  64                                const struct gl_pixelstore_attrib *unpack,
  65                                const GLubyte *bitmap )
  66 {
  67    GLubyte *buf;
  68
  69    if (!_mesa_validate_pbo_access(2, unpack, width, height, 1,
  70                                   GL_COLOR_INDEX, GL_BITMAP,
  71                                   (GLvoid *) bitmap)) {
  72       _mesa_error(ctx, GL_INVALID_OPERATION,"glBitmap(invalid PBO access)");
  73       return NULL;
  74    }
  75
  76    buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
  77                                            GL_READ_ONLY_ARB,
  78                                            unpack->BufferObj);
  79    if (!buf) {
  80       _mesa_error(ctx, GL_INVALID_OPERATION, "glBitmap(PBO is mapped)");
  81       return NULL;
  82    }
  83
  84    return ADD_POINTERS(buf, bitmap);
  85 }
  86
  87 static GLboolean test_bit( const GLubyte *src, GLuint bit )
  88 {
  89    return (src[bit/8] & (1<<(bit % 8))) ? 1 : 0;
  90 }
  91
  92 static void set_bit( GLubyte *dest, GLuint bit )
  93 {
  94    dest[bit/8] |= 1 << (bit % 8);
  95 }
  96
  97 /* Extract a rectangle's worth of data from the bitmap.  Called
  98  * per chunk of HW-sized bitmap.
  99  */
 100 static GLuint get_bitmap_rect(GLsizei width, GLsizei height,
 101                               const struct gl_pixelstore_attrib *unpack,
 102                               const GLubyte *bitmap,
 103                               GLuint x, GLuint y,
 104                               GLuint w, GLuint h,
 105                               GLubyte *dest,
 106                               GLuint row_align,
 107                               GLboolean invert)
 108 {
 109    GLuint src_offset = (x + unpack->SkipPixels) & 0x7;
 110    GLuint mask = unpack->LsbFirst ? 0 : 7;
 111    GLuint bit = 0;
 112    GLint row, col;
 113    GLint first, last;
 114    GLint incr;
 115    GLuint count = 0;
 116
 117    if (INTEL_DEBUG & DEBUG_PIXEL)
 118       printf("%s %d,%d %dx%d bitmap %dx%d skip %d src_offset %d mask %d\n",
 119                    __FUNCTION__, x,y,w,h,width,height,unpack->SkipPixels, src_offset, mask);
 120
 121    if (invert) {
 122       first = h-1;
 123       last = 0;
 124       incr = -1;
 125    }
 126    else {
 127       first = 0;
 128       last = h-1;
 129       incr = 1;
 130    }
 131
 132    /* Require that dest be pre-zero'd.
 133     */
 134    for (row = first; row != (last+incr); row += incr) {
 135       const GLubyte *rowsrc = _mesa_image_address2d(unpack, bitmap,
 136                                                     width, height,
 137                                                     GL_COLOR_INDEX, GL_BITMAP,
 138                                                     y + row, x);
 139
 140       for (col = 0; col < w; col++, bit++) {
 141          if (test_bit(rowsrc, (col + src_offset) ^ mask)) {
 142             set_bit(dest, bit ^ 7);
 143             count++;
 144          }
 145       }
 146
 147       if (row_align)
 148          bit = ALIGN(bit, row_align);
 149    }
 150
 151    return count;
 152 }
 153
 154 /**
 155  * Returns the low Y value of the vertical range given, flipped according to
 156  * whether the framebuffer is or not.
 157  */
 158 static INLINE int
 159 y_flip(struct gl_framebuffer *fb, int y, int height)
 160 {
 161    if (fb->Name != 0)
 162       return y;
 163    else
 164       return fb->Height - y - height;
 165 }
 166
 167 /*
 168  * Render a bitmap.
 169  */
 170 static GLboolean
 171 do_blit_bitmap( GLcontext *ctx,
 172                 GLint dstx, GLint dsty,
 173                 GLsizei width, GLsizei height,
 174                 const struct gl_pixelstore_attrib *unpack,
 175                 const GLubyte *bitmap )
 176 {
 177    struct intel_context *intel = intel_context(ctx);
 178    struct intel_region *dst = intel_drawbuf_region(intel);
 179    struct gl_framebuffer *fb = ctx->DrawBuffer;
 180    GLfloat tmpColor[4];
 181    GLubyte ubcolor[4];
 182    GLuint color;
 183    GLsizei bitmap_width = width;
 184    GLsizei bitmap_height = height;
 185    GLint px, py;
 186    GLuint stipple[32];
 187    GLint orig_dstx = dstx;
 188    GLint orig_dsty = dsty;
 189
 190    /* Update draw buffer bounds */
 191    _mesa_update_state(ctx);
 192
 193    if (ctx->Depth.Test) {
 194       /* The blit path produces incorrect results when depth testing is on.
 195        * It seems the blit Z coord is always 1.0 (the far plane) so fragments
 196        * will likely be obscured by other, closer geometry.
 197        */
 198       return GL_FALSE;
 199    }
 200
 201    if (!dst)
 202        return GL_FALSE;
 203
 204    if (_mesa_is_bufferobj(unpack->BufferObj)) {
 205       bitmap = map_pbo(ctx, width, height, unpack, bitmap);
 206       if (bitmap == NULL)
 207          return GL_TRUE;        /* even though this is an error, we're done */
 208    }
 209
 210    COPY_4V(tmpColor, ctx->Current.RasterColor);
 211
 212    if (NEED_SECONDARY_COLOR(ctx)) {
 213        ADD_3V(tmpColor, tmpColor, ctx->Current.RasterSecondaryColor);
 214    }
 215
 216    UNCLAMPED_FLOAT_TO_UBYTE(ubcolor[0], tmpColor[0]);
 217    UNCLAMPED_FLOAT_TO_UBYTE(ubcolor[1], tmpColor[1]);
 218    UNCLAMPED_FLOAT_TO_UBYTE(ubcolor[2], tmpColor[2]);
 219    UNCLAMPED_FLOAT_TO_UBYTE(ubcolor[3], tmpColor[3]);
 220
 221    if (dst->cpp == 2)
 222       color = PACK_COLOR_565(ubcolor[0], ubcolor[1], ubcolor[2]);
 223    else
 224       color = PACK_COLOR_8888(ubcolor[3], ubcolor[0], ubcolor[1], ubcolor[2]);
 225
 226    if (!intel_check_blit_fragment_ops(ctx, tmpColor[3] == 1.0F))
 227       return GL_FALSE;
 228
 229    intel_prepare_render(intel);
 230
 231    /* Clip to buffer bounds and scissor. */
 232    if (!_mesa_clip_to_region(fb->_Xmin, fb->_Ymin,
 233                              fb->_Xmax, fb->_Ymax,
 234                              &dstx, &dsty, &width, &height))
 235       goto out;
 236
 237    dsty = y_flip(fb, dsty, height);
 238
 239 #define DY 32
 240 #define DX 32
 241
 242    /* Chop it all into chunks that can be digested by hardware: */
 243    for (py = 0; py < height; py += DY) {
 244       for (px = 0; px < width; px += DX) {
 245          int h = MIN2(DY, height - py);
 246          int w = MIN2(DX, width - px);
 247          GLuint sz = ALIGN(ALIGN(w,8) * h, 64)/8;
 248          GLenum logic_op = ctx->Color.ColorLogicOpEnabled ?
 249             ctx->Color.LogicOp : GL_COPY;
 250
 251          assert(sz <= sizeof(stipple));
 252          memset(stipple, 0, sz);
 253
 254          /* May need to adjust this when padding has been introduced in
 255           * sz above:
 256           *
 257           * Have to translate destination coordinates back into source
 258           * coordinates.
 259           */
 260          if (get_bitmap_rect(bitmap_width, bitmap_height, unpack,
 261                              bitmap,
 262                              -orig_dstx + (dstx + px),
 263                              -orig_dsty + y_flip(fb, dsty + py, h),
 264                              w, h,
 265                              (GLubyte *)stipple,
 266                              8,
 267                              fb->Name == 0 ? GL_TRUE : GL_FALSE) == 0)
 268             continue;
 269
 270          if (!intelEmitImmediateColorExpandBlit(intel,
 271                                                 dst->cpp,
 272                                                 (GLubyte *)stipple,
 273                                                 sz,
 274                                                 color,
 275                                                 dst->pitch,
 276                                                 dst->buffer,
 277                                                 0,
 278                                                 dst->tiling,
 279                                                 dstx + px,
 280                                                 dsty + py,
 281                                                 w, h,
 282                                                 logic_op)) {
 283             return GL_FALSE;
 284          }
 285       }
 286    }
 287 out:
 288
 289    if (INTEL_DEBUG & DEBUG_SYNC)
 290       intel_batchbuffer_flush(intel->batch);
 291
 292    if (_mesa_is_bufferobj(unpack->BufferObj)) {
 293       /* done with PBO so unmap it now */
 294       ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
 295                               unpack->BufferObj);
 296    }
 297
 298    intel_check_front_buffer_rendering(intel);
 299
 300    return GL_TRUE;
 301 }
 302
 303 /* There are a large number of possible ways to implement bitmap on
 304  * this hardware, most of them have some sort of drawback.  Here are a
 305  * few that spring to mind:
 306  *
 307  * Blit:
 308  *    - XY_MONO_SRC_BLT_CMD
 309  *         - use XY_SETUP_CLIP_BLT for cliprect clipping.
 310  *    - XY_TEXT_BLT
 311  *    - XY_TEXT_IMMEDIATE_BLT
 312  *         - blit per cliprect, subject to maximum immediate data size.
 313  *    - XY_COLOR_BLT
 314  *         - per pixel or run of pixels
 315  *    - XY_PIXEL_BLT
 316  *         - good for sparse bitmaps
 317  *
 318  * 3D engine:
 319  *    - Point per pixel
 320  *    - Translate bitmap to an alpha texture and render as a quad
 321  *    - Chop bitmap up into 32x32 squares and render w/polygon stipple.
 322  */
 323 void
 324 intelBitmap(GLcontext * ctx,
 325             GLint x, GLint y,
 326             GLsizei width, GLsizei height,
 327             const struct gl_pixelstore_attrib *unpack,
 328             const GLubyte * pixels)
 329 {
 330    if (do_blit_bitmap(ctx, x, y, width, height,
 331                           unpack, pixels))
 332       return;
 333
 334    _mesa_meta_Bitmap(ctx, x, y, width, height, unpack, pixels);
 335 }