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Diffstat (limited to 'src/mesa/drivers/dri/mga/mgapixel.c')
-rw-r--r--src/mesa/drivers/dri/mga/mgapixel.c690
1 files changed, 690 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/mga/mgapixel.c b/src/mesa/drivers/dri/mga/mgapixel.c
new file mode 100644
index 00000000000..0bc4b3fac5f
--- /dev/null
+++ b/src/mesa/drivers/dri/mga/mgapixel.c
@@ -0,0 +1,690 @@
+/*
+ * Copyright 2000 Compaq Computer Inc. and VA Linux Systems, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Keith Whitwell <[email protected]>
+ * Gareth Hughes <[email protected]>
+ */
+/* $XFree86: xc/lib/GL/mesa/src/drv/mga/mgapixel.c,v 1.9 2002/11/05 17:46:08 tsi Exp $ */
+
+#include "enums.h"
+#include "mtypes.h"
+#include "macros.h"
+#include "texutil.h"
+#include "mgadd.h"
+#include "mgacontext.h"
+#include "mgaioctl.h"
+#include "mgapixel.h"
+#include "mgabuffers.h"
+
+#include "xf86drm.h"
+#include "mga_common.h"
+
+#include "swrast/swrast.h"
+
+#define IS_AGP_MEM( mmesa, p ) \
+ ((unsigned long)mmesa->mgaScreen->buffers.map <= ((unsigned long)p) && \
+ (unsigned long)mmesa->mgaScreen->buffers.map + \
+ (unsigned long)mmesa->mgaScreen->buffers.size > ((unsigned long)p))
+#define AGP_OFFSET( mmesa, p ) \
+ (((unsigned long)p) - (unsigned long)mmesa->mgaScreen->buffers.map)
+
+
+#if defined(MESA_packed_depth_stencil)
+static GLboolean
+check_depth_stencil_24_8( const GLcontext *ctx, GLenum type,
+ const struct gl_pixelstore_attrib *packing,
+ const void *pixels, GLint sz,
+ GLint pitch )
+{
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+
+ return ( type == GL_UNSIGNED_INT_24_8_MESA &&
+ ctx->Visual->DepthBits == 24 &&
+ ctx->Visual->StencilBits == 8 &&
+ mmesa->mgaScreen->cpp == 4 &&
+ mmesa->hw_stencil &&
+ !ctx->Pixel.IndexShift &&
+ !ctx->Pixel.IndexOffset &&
+ !ctx->Pixel.MapStencilFlag &&
+ ctx->Pixel.DepthBias == 0.0 &&
+ ctx->Pixel.DepthScale == 1.0 &&
+ !packing->SwapBytes &&
+ pitch % 32 == 0 &&
+ pitch < 4096 );
+}
+#endif
+
+
+static GLboolean
+check_depth( const GLcontext *ctx, GLenum type,
+ const struct gl_pixelstore_attrib *packing,
+ const void *pixels, GLint sz, GLint pitch )
+{
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+
+ if ( IS_AGP_MEM( mmesa, pixels ) &&
+ !( ( type == GL_UNSIGNED_INT && mmesa->mgaScreen->cpp == 4 ) ||
+ ( type == GL_UNSIGNED_SHORT && mmesa->mgaScreen->cpp == 2 ) ) )
+ return GL_FALSE;
+
+ return ( ctx->Pixel.DepthBias == 0.0 &&
+ ctx->Pixel.DepthScale == 1.0 &&
+ !packing->SwapBytes &&
+ pitch % 32 == 0 &&
+ pitch < 4096 );
+}
+
+
+static GLboolean
+check_color( const GLcontext *ctx, GLenum type, GLenum format,
+ const struct gl_pixelstore_attrib *packing,
+ const void *pixels, GLint sz, GLint pitch )
+{
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+ GLuint cpp = mmesa->mgaScreen->cpp;
+
+ /* Can't do conversions on agp reads/draws.
+ */
+ if ( IS_AGP_MEM( mmesa, pixels ) &&
+ !( pitch % 32 == 0 && pitch < 4096 &&
+ ( ( type == GL_UNSIGNED_BYTE &&
+ cpp == 4 && format == GL_BGRA ) ||
+ ( type == GL_UNSIGNED_INT_8_8_8_8 &&
+ cpp == 4 && format == GL_BGRA ) ||
+ ( type == GL_UNSIGNED_SHORT_5_6_5_REV &&
+ cpp == 2 && format == GL_RGB ) ) ) )
+ return GL_FALSE;
+
+ return (!ctx->_ImageTransferState &&
+ !packing->SwapBytes &&
+ !packing->LsbFirst);
+}
+
+static GLboolean
+check_color_per_fragment_ops( const GLcontext *ctx )
+{
+ return (!( ctx->Color.AlphaEnabled ||
+ ctx->Depth.Test ||
+ ctx->Fog.Enabled ||
+ ctx->Scissor.Enabled ||
+ ctx->Stencil.Enabled ||
+ !ctx->Color.ColorMask[0] ||
+ !ctx->Color.ColorMask[1] ||
+ !ctx->Color.ColorMask[2] ||
+ !ctx->Color.ColorMask[3] ||
+ ctx->Color.ColorLogicOpEnabled ||
+ ctx->Texture.Unit[0]._ReallyEnabled ||
+ ctx->Depth.OcclusionTest
+ ) &&
+ ctx->Current.RasterPosValid &&
+ ctx->Pixel.ZoomX == 1.0F &&
+ (ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F));
+}
+
+static GLboolean
+check_depth_per_fragment_ops( const GLcontext *ctx )
+{
+ return ( ctx->Current.RasterPosValid &&
+ ctx->Color.ColorMask[RCOMP] == 0 &&
+ ctx->Color.ColorMask[BCOMP] == 0 &&
+ ctx->Color.ColorMask[GCOMP] == 0 &&
+ ctx->Color.ColorMask[ACOMP] == 0 &&
+ ctx->Pixel.ZoomX == 1.0F &&
+ ( ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F ) );
+}
+
+/* In addition to the requirements for depth:
+ */
+#if defined(MESA_packed_depth_stencil)
+static GLboolean
+check_stencil_per_fragment_ops( const GLcontext *ctx )
+{
+ return ( !ctx->Pixel.IndexShift &&
+ !ctx->Pixel.IndexOffset );
+}
+#endif
+
+
+static GLboolean
+clip_pixelrect( const GLcontext *ctx,
+ const GLframebuffer *buffer,
+ GLint *x, GLint *y,
+ GLsizei *width, GLsizei *height,
+ GLint *skipPixels, GLint *skipRows,
+ GLint *size )
+{
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+
+ *width = MIN2(*width, MAX_WIDTH); /* redundant? */
+
+ /* left clipping */
+ if (*x < buffer->_Xmin) {
+ *skipPixels += (buffer->_Xmin - *x);
+ *width -= (buffer->_Xmin - *x);
+ *x = buffer->_Xmin;
+ }
+
+ /* right clipping */
+ if (*x + *width > buffer->_Xmax)
+ *width -= (*x + *width - buffer->_Xmax - 1);
+
+ if (*width <= 0)
+ return GL_FALSE;
+
+ /* bottom clipping */
+ if (*y < buffer->_Ymin) {
+ *skipRows += (buffer->_Ymin - *y);
+ *height -= (buffer->_Ymin - *y);
+ *y = buffer->_Ymin;
+ }
+
+ /* top clipping */
+ if (*y + *height > buffer->_Ymax)
+ *height -= (*y + *height - buffer->_Ymax - 1);
+
+ if (*height <= 0)
+ return GL_FALSE;
+
+ *size = ((*y + *height - 1) * mmesa->mgaScreen->frontPitch +
+ (*x + *width - 1) * mmesa->mgaScreen->cpp);
+
+ return GL_TRUE;
+}
+
+static GLboolean
+mgaTryReadPixels( GLcontext *ctx,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *pack,
+ GLvoid *pixels )
+{
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+ GLint size, skipPixels, skipRows;
+ GLint pitch = pack->RowLength ? pack->RowLength : width;
+ GLboolean ok;
+
+ GLuint planemask;
+ GLuint source;
+#if 0
+ drmMGABlit blit;
+ GLuint dest;
+ GLint source_pitch, dest_pitch;
+ GLint delta_sx, delta_sy;
+ GLint delta_dx, delta_dy;
+ GLint blit_height, ydir;
+#endif
+
+ if (!clip_pixelrect(ctx, ctx->ReadBuffer,
+ &x, &y, &width, &height,
+ &skipPixels, &skipRows, &size)) {
+ return GL_TRUE;
+ }
+
+ /* Only accelerate reading to agp buffers.
+ */
+ if ( !IS_AGP_MEM(mmesa, (char *)pixels) ||
+ !IS_AGP_MEM(mmesa, (char *)pixels + size) )
+ return GL_FALSE;
+
+ switch (format) {
+#if defined(MESA_packed_depth_stencil)
+ case GL_DEPTH_STENCIL_MESA:
+ ok = check_depth_stencil_24_8(ctx, type, pack, pixels, size, pitch);
+ planemask = ~0;
+ source = mmesa->mgaScreen->depthOffset;
+ break;
+#endif
+
+ case GL_DEPTH_COMPONENT:
+ ok = check_depth(ctx, type, pack, pixels, size, pitch);
+
+ /* Can't accelerate at this depth -- planemask does the wrong
+ * thing; it doesn't clear the low order bits in the
+ * destination, instead it leaves them untouched.
+ *
+ * Could get the acclerator to solid fill the destination with
+ * zeros first... Or get the cpu to do it...
+ */
+ if (ctx->Visual.depthBits == 24)
+ return GL_FALSE;
+
+ planemask = ~0;
+ source = mmesa->mgaScreen->depthOffset;
+ break;
+
+ case GL_RGB:
+ case GL_BGRA:
+ ok = check_color(ctx, type, format, pack, pixels, size, pitch);
+ planemask = ~0;
+ source = (mmesa->draw_buffer == MGA_FRONT ?
+ mmesa->mgaScreen->frontOffset :
+ mmesa->mgaScreen->backOffset);
+ break;
+
+ default:
+ return GL_FALSE;
+ }
+
+ if (!ok) {
+ return GL_FALSE;
+ }
+
+
+ LOCK_HARDWARE( mmesa );
+
+#if 0
+ {
+ __DRIdrawablePrivate *dPriv = mmesa->driDrawable;
+ int nbox, retcode, i;
+
+ UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );
+
+ if (mmesa->dirty_cliprects & MGA_FRONT)
+ mgaUpdateRects( mmesa, MGA_FRONT );
+
+ nbox = dPriv->numClipRects;
+
+ y = dPriv->h - y - height;
+ x += mmesa->drawX;
+ y += mmesa->drawY;
+
+ dest = ((mmesa->mgaScreen->agp.handle + AGP_OFFSET(mmesa, pixels)) |
+ DO_dstmap_sys | DO_dstacc_agp);
+ source_pitch = mmesa->mgaScreen->frontPitch / mmesa->mgaScreen->cpp;
+ dest_pitch = pitch;
+ delta_sx = 0;
+ delta_sy = 0;
+ delta_dx = -x;
+ delta_dy = -y;
+ blit_height = 2*y + height;
+ ydir = -1;
+
+ if (0) fprintf(stderr, "XX doing readpixel blit src_pitch %d dst_pitch %d\n",
+ source_pitch, dest_pitch);
+
+
+
+ for (i = 0 ; i < nbox ; )
+ {
+ int nr = MIN2(i + MGA_NR_SAREA_CLIPRECTS, dPriv->numClipRects);
+ XF86DRIClipRectRec *box = dPriv->pClipRects;
+ drm_clip_rect_t *b = mmesa->sarea->boxes;
+ int n = 0;
+
+ for ( ; i < nr ; i++) {
+ GLint bx = box[i].x1;
+ GLint by = box[i].y1;
+ GLint bw = box[i].x2 - bx;
+ GLint bh = box[i].y2 - by;
+
+ if (bx < x) bw -= x - bx, bx = x;
+ if (by < y) bh -= y - by, by = y;
+ if (bx + bw > x + width) bw = x + width - bx;
+ if (by + bh > y + height) bh = y + height - by;
+ if (bw <= 0) continue;
+ if (bh <= 0) continue;
+
+ b->x1 = bx;
+ b->y1 = by;
+ b->x2 = bx + bw;
+ b->y2 = by + bh;
+ b++;
+ n++;
+ }
+
+ mmesa->sarea->nbox = n;
+
+ if (n && (retcode = drmCommandWrite( mmesa->driFd, DRM_MGA_BLIT,
+ &blit, sizeof(drmMGABlit)))) {
+ fprintf(stderr, "blit ioctl failed, retcode = %d\n", retcode);
+ UNLOCK_HARDWARE( mmesa );
+ exit(1);
+ }
+ }
+
+ UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );
+ }
+#endif
+
+ UNLOCK_HARDWARE( mmesa );
+
+ return GL_TRUE;
+}
+
+static void
+mgaDDReadPixels( GLcontext *ctx,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *pack,
+ GLvoid *pixels )
+{
+ if (!mgaTryReadPixels( ctx, x, y, width, height, format, type, pack, pixels))
+ _swrast_ReadPixels( ctx, x, y, width, height, format, type, pack, pixels);
+}
+
+
+
+
+static void do_draw_pix( GLcontext *ctx,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ GLint pitch,
+ const void *pixels,
+ GLuint dest, GLuint planemask)
+{
+#if 0
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+ drmMGABlit blit;
+ __DRIdrawablePrivate *dPriv = mmesa->driDrawable;
+ XF86DRIClipRectPtr pbox = dPriv->pClipRects;
+ int nbox = dPriv->numClipRects;
+ int retcode, i;
+
+ y = dPriv->h - y - height;
+ x += mmesa->drawX;
+ y += mmesa->drawY;
+
+ blit.dest = dest;
+ blit.planemask = planemask;
+ blit.source = ((mmesa->mgaScreen->agp.handle + AGP_OFFSET(mmesa, pixels))
+ | SO_srcmap_sys | SO_srcacc_agp);
+ blit.dest_pitch = mmesa->mgaScreen->frontPitch / mmesa->mgaScreen->cpp;
+ blit.source_pitch = pitch;
+ blit.delta_sx = -x;
+ blit.delta_sy = -y;
+ blit.delta_dx = 0;
+ blit.delta_dy = 0;
+ if (ctx->Pixel.ZoomY == -1) {
+ blit.height = height;
+ blit.ydir = 1;
+ } else {
+ blit.height = height;
+ blit.ydir = -1;
+ }
+
+ if (0) fprintf(stderr,
+ "doing drawpixel blit src_pitch %d dst_pitch %d\n",
+ blit.source_pitch, blit.dest_pitch);
+
+ for (i = 0 ; i < nbox ; )
+ {
+ int nr = MIN2(i + MGA_NR_SAREA_CLIPRECTS, dPriv->numClipRects);
+ XF86DRIClipRectRec *box = mmesa->pClipRects;
+ drm_clip_rect_t *b = mmesa->sarea->boxes;
+ int n = 0;
+
+ for ( ; i < nr ; i++) {
+ GLint bx = box[i].x1;
+ GLint by = box[i].y1;
+ GLint bw = box[i].x2 - bx;
+ GLint bh = box[i].y2 - by;
+
+ if (bx < x) bw -= x - bx, bx = x;
+ if (by < y) bh -= y - by, by = y;
+ if (bx + bw > x + width) bw = x + width - bx;
+ if (by + bh > y + height) bh = y + height - by;
+ if (bw <= 0) continue;
+ if (bh <= 0) continue;
+
+ b->x1 = bx;
+ b->y1 = by;
+ b->x2 = bx + bw;
+ b->y2 = by + bh;
+ b++;
+ n++;
+ }
+
+ mmesa->sarea->nbox = n;
+
+ if (n && (retcode = drmCommandWrite( mmesa->driFd, DRM_MGA_BLIT,
+ &blit, sizeof(drmMGABlit)))) {
+ fprintf(stderr, "blit ioctl failed, retcode = %d\n", retcode);
+ UNLOCK_HARDWARE( mmesa );
+ exit(1);
+ }
+ }
+#endif
+}
+
+
+
+
+static GLboolean
+mgaTryDrawPixels( GLcontext *ctx,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLvoid *pixels )
+{
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+ GLint size, skipPixels, skipRows;
+ GLint pitch = unpack->RowLength ? unpack->RowLength : width;
+ GLuint dest, planemask;
+ GLuint cpp = mmesa->mgaScreen->cpp;
+
+ if (!clip_pixelrect(ctx, ctx->DrawBuffer,
+ &x, &y, &width, &height,
+ &skipPixels, &skipRows, &size)) {
+ return GL_TRUE;
+ }
+
+
+ switch (format) {
+#if defined(MESA_packed_depth_stencil)
+ case GL_DEPTH_STENCIL_MESA:
+ dest = mmesa->mgaScreen->depthOffset;
+ planemask = ~0;
+ if (!check_depth_stencil_24_8(ctx, type, unpack, pixels, size, pitch) ||
+ !check_depth_per_fragment_ops(ctx) ||
+ !check_stencil_per_fragment_ops(ctx))
+ return GL_FALSE;
+ break;
+#endif
+
+ case GL_DEPTH_COMPONENT:
+ dest = mmesa->mgaScreen->depthOffset;
+
+ if (ctx->Visual.depthBits == 24)
+ planemask = ~0xff;
+ else
+ planemask = ~0;
+
+ if (!check_depth(ctx, type, unpack, pixels, size, pitch) ||
+ !check_depth_per_fragment_ops(ctx))
+ return GL_FALSE;
+ break;
+
+ case GL_RGB:
+ case GL_BGRA:
+ dest = (mmesa->draw_buffer == MGA_FRONT ?
+ mmesa->mgaScreen->frontOffset :
+ mmesa->mgaScreen->backOffset);
+
+ planemask = mgaPackColor(cpp,
+ ctx->Color.ColorMask[RCOMP],
+ ctx->Color.ColorMask[GCOMP],
+ ctx->Color.ColorMask[BCOMP],
+ ctx->Color.ColorMask[ACOMP]);
+
+ if (cpp == 2)
+ planemask |= planemask << 16;
+
+ if (!check_color(ctx, type, format, unpack, pixels, size, pitch)) {
+ return GL_FALSE;
+ }
+ if (!check_color_per_fragment_ops(ctx)) {
+ return GL_FALSE;
+ }
+ break;
+
+ default:
+ return GL_FALSE;
+ }
+
+ LOCK_HARDWARE_QUIESCENT( mmesa );
+
+ if (mmesa->dirty_cliprects & MGA_FRONT)
+ mgaUpdateRects( mmesa, MGA_FRONT );
+
+ if ( IS_AGP_MEM(mmesa, (char *)pixels) &&
+ IS_AGP_MEM(mmesa, (char *)pixels + size) )
+ {
+ do_draw_pix( ctx, x, y, width, height, pitch, pixels,
+ dest, planemask );
+ UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );
+ }
+ else
+ {
+ /* Pixels is in regular memory -- get dma buffers and perform
+ * upload through them.
+ */
+/* drmBufPtr buf = mgaGetBufferLocked(mmesa); */
+ GLuint bufferpitch = (width*cpp+31)&~31;
+
+ char *address = 0; /* mmesa->mgaScreen->agp.map; */
+
+ do {
+/* GLuint rows = MIN2( height, MGA_DMA_BUF_SZ / bufferpitch ); */
+ GLuint rows = height;
+
+
+ if (0) fprintf(stderr, "trying to upload %d rows (pitch %d)\n",
+ rows, bufferpitch);
+
+ /* The texture conversion code is so slow that there is only
+ * negligble speedup when the buffers/images don't exactly
+ * match:
+ */
+#if 0
+ if (cpp == 2) {
+ if (!_mesa_convert_texsubimage2d( MESA_FORMAT_RGB565,
+ 0, 0, width, rows,
+ bufferpitch, format, type,
+ unpack, pixels, address )) {
+/* mgaReleaseBufLocked( mmesa, buf ); */
+ UNLOCK_HARDWARE(mmesa);
+ return GL_FALSE;
+ }
+ } else {
+ if (!_mesa_convert_texsubimage2d( MESA_FORMAT_ARGB8888,
+ 0, 0, width, rows,
+ bufferpitch, format, type,
+ unpack, pixels, address )) {
+/* mgaReleaseBufLocked( mmesa, buf ); */
+ UNLOCK_HARDWARE(mmesa);
+ return GL_FALSE;
+ }
+ }
+#else
+ memcpy( address, pixels, rows*bufferpitch );
+#endif
+
+ do_draw_pix( ctx, x, y, width, rows,
+ bufferpitch/cpp, address, dest, planemask );
+
+ /* Fix me -- use multiple buffers to avoid flush.
+ */
+ UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );
+
+ pixels = (void *)((char *) pixels + rows * pitch);
+ height -= rows;
+ y += rows;
+ } while (height);
+
+/* mgaReleaseBufLocked( mmesa, buf ); */
+ }
+
+ UNLOCK_HARDWARE( mmesa );
+ mmesa->dirty |= MGA_UPLOAD_CLIPRECTS;
+
+ return GL_TRUE;
+}
+
+static void
+mgaDDDrawPixels( GLcontext *ctx,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *unpack,
+ const GLvoid *pixels )
+{
+ if (!mgaTryDrawPixels( ctx, x, y, width, height, format, type,
+ unpack, pixels ))
+ _swrast_DrawPixels( ctx, x, y, width, height, format, type,
+ unpack, pixels );
+}
+
+
+
+/* Stub functions - not a real allocator, always returns pointer to
+ * the same block of agp space which isn't used for anything else at
+ * present.
+ */
+#if defined(MESA_hacked_agp_allocator)
+static void mgaDDFreeAgpMemory( GLcontext *ctx, void *ptr )
+{
+ (void) ptr;
+}
+
+static void *mgaDDAllocateAgpMemory( GLcontext *ctx, GLsizei size )
+{
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+
+ if (size < mmesa->mgaScreen->textureSize[MGA_AGP_HEAP])
+ return mmesa->mgaScreen->texVirtual[MGA_AGP_HEAP];
+ else
+ return 0;
+}
+
+static GLint mgaDDGetAgpOffset( GLcontext *ctx, const void *ptr )
+{
+ mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+
+ if (!IS_AGP_MEM(mmesa, ptr))
+ return -1;
+
+ return AGP_OFFSET(mmesa, ptr);
+}
+#endif
+
+
+void mgaDDInitPixelFuncs( GLcontext *ctx )
+{
+#if defined (MESA_experimetal_agp_allocator)
+ ctx->Driver.AllocateAgpMemory = mgaDDAllocateAgpMemory;
+ ctx->Driver.GetAgpOffset = mgaDDGetAgpOffset;
+ ctx->Driver.FreeAgpMemory = mgaDDFreeAgpMemory;
+#endif
+
+ /* Pixel path fallbacks.
+ */
+ ctx->Driver.Accum = _swrast_Accum;
+ ctx->Driver.Bitmap = _swrast_Bitmap;
+ ctx->Driver.CopyPixels = _swrast_CopyPixels;
+ ctx->Driver.DrawPixels = _swrast_DrawPixels;
+ ctx->Driver.ReadPixels = _swrast_ReadPixels;
+
+ if (getenv("MGA_BLIT_PIXELS")) {
+ ctx->Driver.ReadPixels = mgaDDReadPixels; /* requires agp dest */
+ ctx->Driver.DrawPixels = mgaDDDrawPixels; /* works with agp/normal mem */
+ }
+}
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