[mach64] Halve max w/h for hardware-accelerated operations.

EXA hits these limits for some operations on offscreen pixmaps and GTPRO seems
to support the reduced limits.

2 files changed, 25 insertions, 9 deletions

diff --git a/src/atimach64.c b/src/atimach64.c
index 5cb991d..cc3a3cb 100644
--- a/src/atimach64.c
+++ b/src/atimach64.c
@@ -84,7 +84,6 @@ ATIMach64PreInit
 )
 {
     CARD32 bus_cntl, config_cntl;
-    int    tmp;
 
 #ifndef AVOID_CPIO
 
@@ -258,12 +257,29 @@ ATIMach64PreInit
         pATIHW->src_cntl = SRC_LINE_X_DIR;
 
         /* Initialise scissor, allowing for offscreen areas */
-        pATIHW->sc_right = (pATI->displayWidth * pATI->XModifier) - 1;
-        tmp = pATI->displayWidth * pATI->bitsPerPixel;
-        tmp = (((pScreenInfo->videoRam * (1024 * 8)) + tmp - 1) / tmp) - 1;
-        if (tmp > ATIMach64MaxY)
-            tmp = ATIMach64MaxY;
-        pATIHW->sc_bottom = tmp;
+#ifdef USE_XAA
+        if (!pATI->useEXA)
+        {
+            int width, height, total;
+
+            pATIHW->sc_right = (pATI->displayWidth * pATI->XModifier) - 1;
+            width = pATI->displayWidth * pATI->bitsPerPixel;
+            total = pScreenInfo->videoRam * (1024 * 8);
+            height = (total + width - 1) / width;
+            if (height > ATIMach64MaxY + 1)
+                height = ATIMach64MaxY + 1;
+            pATIHW->sc_bottom = height - 1;
+        }
+#endif /* USE_XAA */
+
+#ifdef USE_EXA
+        if (pATI->useEXA)
+        {
+            pATIHW->sc_right = ATIMach64MaxX;
+            pATIHW->sc_bottom = ATIMach64MaxY;
+        }
+#endif /* USE_EXA */
+
         pATI->sc_left_right = SetWord(pATI->NewHW.sc_right, 1) |
             SetWord(pATI->NewHW.sc_left, 0);
         pATI->sc_top_bottom = SetWord(pATI->NewHW.sc_bottom, 1) |
diff --git a/src/atimach64accel.h b/src/atimach64accel.h
index 2917b7a..973f2ba 100644
--- a/src/atimach64accel.h
+++ b/src/atimach64accel.h
@@ -29,8 +29,8 @@
 #include "xaa.h"
 #include "exa.h"
 
-#define ATIMach64MaxX  8191
-#define ATIMach64MaxY 32767
+#define ATIMach64MaxX  4095
+#define ATIMach64MaxY 16383
 
 #ifdef USE_EXA
 extern Bool ATIMach64ExaInit(ScreenPtr);