src/mesa/drivers/dri/mga/mgaspan.c

   1 /*
   2  * Copyright 2000-2001 VA Linux Systems, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  */
  27 /* $XFree86: xc/lib/GL/mesa/src/drv/mga/mgaspan.c,v 1.11 2002/10/30 12:51:36 alanh Exp $ */
  28
  29 #include "mtypes.h"
  30 #include "mgadd.h"
  31 #include "mgacontext.h"
  32 #include "mgaspan.h"
  33 #include "mgaioctl.h"
  34 #include "swrast/swrast.h"
  35
  36 #define DBG 0
  37
  38
  39 #define LOCAL_VARS                                      \
  40    __DRIdrawablePrivate *dPriv = mmesa->mesa_drawable;  \
  41    mgaScreenPrivate *mgaScreen = mmesa->mgaScreen;      \
  42    __DRIscreenPrivate *sPriv = mmesa->driScreen;        \
  43    GLuint pitch = mgaScreen->frontPitch;                \
  44    GLuint height = dPriv->h;                            \
  45    char *read_buf = (char *)(sPriv->pFB +               \
  46                         mmesa->readOffset +             \
  47                         dPriv->x * mgaScreen->cpp +     \
  48                         dPriv->y * pitch);              \
  49    char *buf = (char *)(sPriv->pFB +                    \
  50                         mmesa->drawOffset +             \
  51                         dPriv->x * mgaScreen->cpp +     \
  52                         dPriv->y * pitch);              \
  53    GLuint p;                                            \
  54    (void) read_buf; (void) buf; (void) p
  55
  56
  57
  58 #define LOCAL_DEPTH_VARS                                                \
  59    __DRIdrawablePrivate *dPriv = mmesa->mesa_drawable;                  \
  60    mgaScreenPrivate *mgaScreen = mmesa->mgaScreen;                      \
  61    __DRIscreenPrivate *sPriv = mmesa->driScreen;                        \
  62    GLuint pitch = mgaScreen->frontPitch;                                \
  63    GLuint height = dPriv->h;                                            \
  64    char *buf = (char *)(sPriv->pFB +                                    \
  65                         mgaScreen->depthOffset +                        \
  66                         dPriv->x * mgaScreen->cpp +                     \
  67                         dPriv->y * pitch)
  68
  69 #define LOCAL_STENCIL_VARS LOCAL_DEPTH_VARS
  70
  71 #define CLIPPIXEL(_x,_y) (_x >= minx && _x < maxx && \
  72                           _y >= miny && _y < maxy)
  73
  74 #define CLIPSPAN( _x, _y, _n, _x1, _n1, _i )                            \
  75    if ( _y < miny || _y >= maxy ) {                                     \
  76       _n1 = 0, _x1 = x;                                                 \
  77    } else {                                                             \
  78       _n1 = _n;                                                         \
  79       _x1 = _x;                                                         \
  80       if ( _x1 < minx ) _i += (minx-_x1), n1 -= (minx-_x1), _x1 = minx; \
  81       if ( _x1 + _n1 >= maxx ) n1 -= (_x1 + n1 - maxx);                 \
  82    }
  83
  84
  85 #define HW_LOCK()                               \
  86    mgaContextPtr mmesa = MGA_CONTEXT(ctx);      \
  87    FLUSH_BATCH(mmesa);                          \
  88    LOCK_HARDWARE_QUIESCENT(mmesa);
  89
  90
  91 #define HW_CLIPLOOP()                                           \
  92   do {                                                          \
  93     int _nc = mmesa->numClipRects;                              \
  94     while (_nc--) {                                             \
  95        int minx = mmesa->pClipRects[_nc].x1 - mmesa->drawX;     \
  96        int miny = mmesa->pClipRects[_nc].y1 - mmesa->drawY;     \
  97        int maxx = mmesa->pClipRects[_nc].x2 - mmesa->drawX;     \
  98        int maxy = mmesa->pClipRects[_nc].y2 - mmesa->drawY;
  99
 100 #define HW_ENDCLIPLOOP()                        \
 101     }                                           \
 102   } while (0)
 103
 104 #define HW_UNLOCK()                             \
 105     UNLOCK_HARDWARE(mmesa);
 106
 107
 108
 109
 110
 111
 112 #define Y_FLIP(_y) (height - _y - 1)
 113
 114 /* 16 bit, RGB565 color spanline and pixel functions
 115  */
 116
 117 #define GET_SRC_PTR(_x, _y) (read_buf + _x * 2 + _y * pitch)
 118 #define GET_DST_PTR(_x, _y) (     buf + _x * 2 + _y * pitch)
 119 #define SPANTMP_PIXEL_FMT GL_RGB
 120 #define SPANTMP_PIXEL_TYPE GL_UNSIGNED_SHORT_5_6_5
 121
 122 #define TAG(x)    mga##x##_565
 123 #define TAG2(x,y) mga##x##_565##y
 124 #include "spantmp2.h"
 125
 126 /* 32 bit, ARGB8888 color spanline and pixel functions
 127  */
 128
 129 #define GET_SRC_PTR(_x, _y) (read_buf + _x * 4 + _y * pitch)
 130 #define GET_DST_PTR(_x, _y) (     buf + _x * 4 + _y * pitch)
 131 #define SPANTMP_PIXEL_FMT GL_BGRA
 132 #define SPANTMP_PIXEL_TYPE GL_UNSIGNED_INT_8_8_8_8_REV
 133
 134 #define TAG(x)    mga##x##_8888
 135 #define TAG2(x,y) mga##x##_8888##y
 136 #include "spantmp2.h"
 137
 138
 139 /* 16 bit depthbuffer functions.
 140  */
 141 #define WRITE_DEPTH( _x, _y, d )        \
 142    *(GLushort *)(buf + _x*2 + _y*pitch) = d;
 143
 144 #define READ_DEPTH( d, _x, _y )         \
 145    d = *(GLushort *)(buf + _x*2 + _y*pitch);
 146
 147 #define TAG(x) mga##x##_16
 148 #include "depthtmp.h"
 149
 150
 151
 152
 153 /* 32 bit depthbuffer functions.
 154  */
 155 #define WRITE_DEPTH( _x, _y, d )        \
 156    *(GLuint *)(buf + _x*4 + _y*pitch) = d;
 157
 158 #define READ_DEPTH( d, _x, _y )         \
 159    d = *(GLuint *)(buf + _x*4 + _y*pitch);
 160
 161 #define TAG(x) mga##x##_32
 162 #include "depthtmp.h"
 163
 164
 165
 166 /* 24/8 bit interleaved depth/stencil functions
 167  */
 168 #define WRITE_DEPTH( _x, _y, d ) {                      \
 169    GLuint tmp = *(GLuint *)(buf + _x*4 + _y*pitch);     \
 170    tmp &= 0xff;                                         \
 171    tmp |= (d) << 8;                                     \
 172    *(GLuint *)(buf + _x*4 + _y*pitch) = tmp;            \
 173 }
 174
 175 #define READ_DEPTH( d, _x, _y ) {                               \
 176    d = (*(GLuint *)(buf + _x*4 + _y*pitch) & ~0xff) >> 8;       \
 177 }
 178
 179 #define TAG(x) mga##x##_24_8
 180 #include "depthtmp.h"
 181
 182 #define WRITE_STENCIL( _x, _y, d ) {                    \
 183    GLuint tmp = *(GLuint *)(buf + _x*4 + _y*pitch);     \
 184    tmp &= 0xffffff00;                                   \
 185    tmp |= d & 0xff;                                     \
 186    *(GLuint *)(buf + _x*4 + _y*pitch) = tmp;            \
 187 }
 188
 189 #define READ_STENCIL( d, _x, _y )               \
 190    d = *(GLuint *)(buf + _x*4 + _y*pitch) & 0xff;
 191
 192 #define TAG(x) mga##x##_24_8
 193 #include "stenciltmp.h"
 194
 195
 196
 197 /*
 198  * This function is called to specify which buffer to read and write
 199  * for software rasterization (swrast) fallbacks.  This doesn't necessarily
 200  * correspond to glDrawBuffer() or glReadBuffer() calls.
 201  */
 202 static void mgaDDSetBuffer(GLcontext *ctx, GLframebuffer *buffer,
 203                            GLuint bufferBit)
 204 {
 205    mgaContextPtr mmesa = MGA_CONTEXT(ctx);
 206    unsigned int   offset;
 207
 208    assert((bufferBit == DD_FRONT_LEFT_BIT) || (bufferBit == DD_BACK_LEFT_BIT));
 209
 210    offset = (bufferBit == DD_FRONT_LEFT_BIT)
 211        ? mmesa->mgaScreen->frontOffset
 212        : mmesa->mgaScreen->backOffset;
 213
 214    mmesa->drawOffset = offset;
 215    mmesa->readOffset = offset;
 216
 217    assert( (buffer == mmesa->driDrawable->driverPrivate)
 218            || (buffer == mmesa->driReadable->driverPrivate) );
 219
 220    mmesa->mesa_drawable = (buffer == mmesa->driDrawable->driverPrivate)
 221        ? mmesa->driDrawable : mmesa->driReadable;
 222 }
 223
 224 /**
 225  * Initialize the driver callbacks for the read / write span functions.
 226  *
 227  * \bug
 228  * To really support RGB888 and RGBA8888 visuals, we need separate read and
 229  * write routines for 888 and 8888.  We also need to determine whether or not
 230  * the visual has destination alpha.
 231  */
 232 void mgaDDInitSpanFuncs( GLcontext *ctx )
 233 {
 234    mgaContextPtr mmesa = MGA_CONTEXT(ctx);
 235    struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference(ctx);
 236
 237    swdd->SetBuffer = mgaDDSetBuffer;
 238
 239    switch (mmesa->mgaScreen->cpp) {
 240    case 2:
 241       mgaInitPointers_565( swdd );
 242
 243       swdd->ReadDepthSpan = mgaReadDepthSpan_16;
 244       swdd->WriteDepthSpan = mgaWriteDepthSpan_16;
 245       swdd->ReadDepthPixels = mgaReadDepthPixels_16;
 246       swdd->WriteDepthPixels = mgaWriteDepthPixels_16;
 247       break;
 248
 249    case 4:
 250       mgaInitPointers_8888( swdd );
 251
 252       if (!mmesa->hw_stencil) {
 253          swdd->ReadDepthSpan = mgaReadDepthSpan_32;
 254          swdd->WriteDepthSpan = mgaWriteDepthSpan_32;
 255          swdd->ReadDepthPixels = mgaReadDepthPixels_32;
 256          swdd->WriteDepthPixels = mgaWriteDepthPixels_32;
 257       } else {
 258          swdd->ReadDepthSpan = mgaReadDepthSpan_24_8;
 259          swdd->WriteDepthSpan = mgaWriteDepthSpan_24_8;
 260          swdd->ReadDepthPixels = mgaReadDepthPixels_24_8;
 261          swdd->WriteDepthPixels = mgaWriteDepthPixels_24_8;
 262
 263          swdd->ReadStencilSpan = mgaReadStencilSpan_24_8;
 264          swdd->WriteStencilSpan = mgaWriteStencilSpan_24_8;
 265          swdd->ReadStencilPixels = mgaReadStencilPixels_24_8;
 266          swdd->WriteStencilPixels = mgaWriteStencilPixels_24_8;
 267       }
 268       break;
 269    }
 270 }