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Fix some failures from the fixed-to-float script in cogl-texture

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The script converted calls to COGL_FIXED_MUL(x,y) to (x*y). However
this fails for cases like this:

 COGL_FIXED_MUL(a + b, c)

which become

 (a + b * c)

The meaning of this is of course different because multiplication has
a higher precedence than addition.

This was causing breakages in cogl_texture_quad_sw when the vertex
coordinates are not in increasing order. This was the case in
test-backface-culling when NPOTs are not available.
This commit is contained in:
Neil Roberts 2009-01-22 17:42:26 +00:00
parent 047161ea96
commit 634cdeab1f
2 changed files with 16 additions and 24 deletions
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20
clutter/cogl/gl/cogl-texture.c
View File

@ -2072,8 +2072,8 @@ _cogl_texture_quad_sw (CoglTexture *tex,
tw = (float)(tex->bitmap.width);
th = (float)(tex->bitmap.height);
tqx = (x2 - x1 / (tw * (tx2 - tx1)));
tqy = (y2 - y1 / (th * (ty2 - ty1)));
tqx = (x2 - x1) / (tw * (tx2 - tx1));
tqy = (y2 - y1) / (th * (ty2 - ty1));
/* Integral texture coordinate for first tile */
first_tx = (float)(floorf (tx1));
@ -2088,8 +2088,8 @@ _cogl_texture_quad_sw (CoglTexture *tex,
ty2 = (ty2 * th);
/* Quad coordinate of the first tile */
first_qx = x1 - (tx1 - first_tx * tqx);
first_qy = y1 - (ty1 - first_ty * tqy);
first_qx = x1 - (tx1 - first_tx) * tqx;
first_qy = y1 - (ty1 - first_ty) * tqy;
/* Iterate until whole quad height covered */
@ -2102,11 +2102,9 @@ _cogl_texture_quad_sw (CoglTexture *tex,
if (!iter_y.intersects) continue;
/* Span-quad intersection in quad coordinates */
slice_qy1 = first_qy +
(iter_y.intersect_start - first_ty * tqy);
slice_qy1 = first_qy + (iter_y.intersect_start - first_ty) * tqy;
slice_qy2 = first_qy +
(iter_y.intersect_end - first_ty * tqy);
slice_qy2 = first_qy + (iter_y.intersect_end - first_ty) * tqy;
/* Localize slice texture coordinates */
slice_ty1 = iter_y.intersect_start - iter_y.pos;
@ -2130,11 +2128,9 @@ _cogl_texture_quad_sw (CoglTexture *tex,
if (!iter_x.intersects) continue;
/* Span-quad intersection in quad coordinates */
slice_qx1 = first_qx +
(iter_x.intersect_start - first_tx * tqx);
slice_qx1 = first_qx + (iter_x.intersect_start - first_tx) * tqx;
slice_qx2 = first_qx +
(iter_x.intersect_end - first_tx * tqx);
slice_qx2 = first_qx + (iter_x.intersect_end - first_tx) * tqx;
/* Localize slice texture coordinates */
slice_tx1 = iter_x.intersect_start - iter_x.pos;

20
clutter/cogl/gles/cogl-texture.c
View File

@ -2202,8 +2202,8 @@ _cogl_texture_quad_sw (CoglTexture *tex,
tw = (float)(tex->bitmap.width);
th = (float)(tex->bitmap.height);
tqx = (x2 - x1 / (tw * (tx2 - tx1)));
tqy = (y2 - y1 / (th * (ty2 - ty1)));
tqx = (x2 - x1) / (tw * (tx2 - tx1));
tqy = (y2 - y1) / (th * (ty2 - ty1));
/* Integral texture coordinate for first tile */
first_tx = (float)(floorf (tx1));
@ -2218,8 +2218,8 @@ _cogl_texture_quad_sw (CoglTexture *tex,
ty2 = (ty2 * th);
/* Quad coordinate of the first tile */
first_qx = x1 - (tx1 - first_tx * tqx);
first_qy = y1 - (ty1 - first_ty * tqy);
first_qx = x1 - (tx1 - first_tx) * tqx;
first_qy = y1 - (ty1 - first_ty) * tqy;
/* Iterate until whole quad height covered */
@ -2232,11 +2232,9 @@ _cogl_texture_quad_sw (CoglTexture *tex,
if (!iter_y.intersects) continue;
/* Span-quad intersection in quad coordinates */
slice_qy1 = first_qy +
(iter_y.intersect_start - first_ty * tqy);
slice_qy1 = first_qy + (iter_y.intersect_start - first_ty) * tqy;
slice_qy2 = first_qy +
(iter_y.intersect_end - first_ty * tqy);
slice_qy2 = first_qy + (iter_y.intersect_end - first_ty) * tqy;
/* Localize slice texture coordinates */
slice_ty1 = iter_y.intersect_start - iter_y.pos;
@ -2257,11 +2255,9 @@ _cogl_texture_quad_sw (CoglTexture *tex,
if (!iter_x.intersects) continue;
/* Span-quad intersection in quad coordinates */
slice_qx1 = first_qx +
(iter_x.intersect_start - first_tx * tqx);
slice_qx1 = first_qx + (iter_x.intersect_start - first_tx) * tqx;
slice_qx2 = first_qx +
(iter_x.intersect_end - first_tx * tqx);
slice_qx2 = first_qx + (iter_x.intersect_end - first_tx) * tqx;
/* Localize slice texture coordinates */
slice_tx1 = iter_x.intersect_start - iter_x.pos;