[PATCH 2/2] radeon: avoid rounding errors in texture coords for textured xv on EG+

[Roland Scheidegger]

make sure the division is done with floats, otherwise the coordinate
can be wrong up to 1 texel.
Particularly visible with clipping and small source scaled up (since one
texel can be a shift of several pixels) but could be seen even unscaled.
Should provide more accurate coords without clipping too depending on the
scale factor probably.
This is a straight port of 688c8a54a00b01e73a11970ad2abe858f8c7c5c4
when I apparently forgot the eg code...
---
 src/evergreen_textured_videofuncs.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/evergreen_textured_videofuncs.c b/src/evergreen_textured_videofuncs.c
index 7c5d15d..0643ac6 100644
--- a/src/evergreen_textured_videofuncs.c
+++ b/src/evergreen_textured_videofuncs.c
@@ -481,7 +481,7 @@ EVERGREENDisplayTexturedVideo(ScrnInfoPtr pScrn, RADEONPortPrivPtr pPriv)
     }
 
     while (nBox--) {
-	int srcX, srcY, srcw, srch;
+	float srcX, srcY, srcw, srch;
 	int dstX, dstY, dstw, dsth;
 	float *vb;
 
@@ -493,13 +493,13 @@ EVERGREENDisplayTexturedVideo(ScrnInfoPtr pScrn, RADEONPortPrivPtr pPriv)
 
 	srcX = pPriv->src_x;
 	srcX += ((pBox->x1 - pPriv->drw_x) *
-		 pPriv->src_w) / pPriv->dst_w;
+		 pPriv->src_w) / (float)pPriv->dst_w;
 	srcY = pPriv->src_y;
 	srcY += ((pBox->y1 - pPriv->drw_y) *
-		 pPriv->src_h) / pPriv->dst_h;
+		 pPriv->src_h) / (float)pPriv->dst_h;
 
-	srcw = (pPriv->src_w * dstw) / pPriv->dst_w;
-	srch = (pPriv->src_h * dsth) / pPriv->dst_h;
+	srcw = (pPriv->src_w * dstw) / (float)pPriv->dst_w;
+	srch = (pPriv->src_h * dsth) / (float)pPriv->dst_h;
 
 	vb = radeon_vbo_space(pScrn, &accel_state->vbo, 16);
 
-- 
1.7.7