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glamor: Eliminate diagonal tearing in xv

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This uses a single large triangle and a scissor to draw the video
instead of two triangles.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Keith Packard 2014-07-28 11:10:15 -07:00
parent 29eaa61cb2
commit 8a60d1c3f4
1 changed files with 8 additions and 5 deletions
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13
glamor/glamor_xv.c
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@ -336,6 +336,7 @@ glamor_xv_render(glamor_port_private *port_priv)
GL_FALSE, 2 * sizeof(float), vertices);
glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
glEnable(GL_SCISSOR_TEST);
for (i = 0; i < nBox; i++) {
float off_x = box[i].x1 - port_priv->drw_x;
float off_y = box[i].y1 - port_priv->drw_y;
@ -356,23 +357,25 @@ glamor_xv_render(glamor_port_private *port_priv)
glamor_set_normalize_vcoords(pixmap_priv,
dst_xscale, dst_yscale,
dstx,
dstx - dstw,
dsty,
dstx + dstw,
dsty + dsth,
dsty + dsth * 2,
vertices);
glamor_set_normalize_tcoords(src_pixmap_priv[0],
src_xscale[0],
src_yscale[0],
srcx,
srcx - srcw,
srcy,
srcx + srcw,
srcy + srch,
srcy + srch * 2,
texcoords);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glScissor(dstx, dsty, dstw, dsth);
glDrawArrays(GL_TRIANGLE_FAN, 0, 3);
}
glDisable(GL_SCISSOR_TEST);
glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
glDisableVertexAttribArray(GLAMOR_VERTEX_SOURCE);