Commit Graph

5 Commits

Author SHA1 Message Date
Adam Jackson
5aa8ed93ce test-cogl-sub-texture: Allow single-bit rendering error
Signed-off-by: Adam Jackson <ajax@redhat.com>

http://bugzilla.clutter-project.org/show_bug.cgi?id=2640
2011-05-14 01:12:44 +01:00
Robert Bragg
4ca1e491da tests: don't delay/skip frames due to glReadPixel concerns
This greatly speeds up running all the conformance tests by no longer
delaying many of the tests for a number of dummy frames to be painted.

We used to skip frames because we thought there was a problem with the
driver's glReadPixels implementation. Although we have seen driver
issues at times the real reason the delay was needed was because
resizing the stage usually happens asynchronously (because a non
synchronous X request is used by clutter_stage_set_size()). We now force
all X requests to be synchronized for the conformance tests so this is
no longer a problem and we can avoid these hacks.
2010-07-08 22:40:35 +01:00
Neil Roberts
4be4f56bdf cogl-sub-texture: Optimise taking a sub texture of a sub texture
When creating a Cogl sub-texture, if the full texture is also a sub
texture it will now just offset the x and y and reference the full
texture instead. This avoids one level of indirection when rendering
the texture which reduces the chances of getting rounding errors in
the calculations.
2010-02-12 16:57:17 +00:00
Neil Roberts
36f18e5ac5 cogl: Make CoglSubTexture only work for quad rendering
The sub texture backend doesn't work well as a completely general
texture backend because for example when rendering with cogl_polygon
it needs to be able to tranform arbitrary texture coordinates without
reference to the other coordintes. This can't be done when the texture
coordinates are a multiple of one because sometimes the coordinate
should represent the left or top edge and sometimes it should
represent the bottom or top edge. For example if the s coordinates are
0 and 1 then 1 represents the right edge but if they are 1 and 2 then
1 represents the left edge.

Instead the sub-textures are now documented not to support coordinates
outside the range [0,1]. The coordinates for the sub-region are now
represented as integers as this helps avoid rounding issues. The
region can no longer be a super-region of the texture as this
simplifies the code quite a lot.

There are two new texture virtual functions:

transform_quad_coords_to_gl - This transforms two pairs of coordinates
     representing a quad. It will return FALSE if the coordinates can
     not be transformed. The sub texture backend uses this to detect
     coordinates that require repeating which causes cogl-primitives
     to use manual repeating.

ensure_non_quad_rendering - This is used in cogl_polygon and
     cogl_vertex_buffer to inform the texture backend that
     transform_quad_to_gl is going to be used. The atlas backend
     migrates the texture out of the atlas when it hits this.
2010-01-18 09:22:04 +00:00
Neil Roberts
27c4eb483d cogl: Add a conformance test for sub textures
This tests creating a sub texture from a larger texture using various
different texture coordinates. It also tries to read back the texture
data using cogl_texture_get_data.
2009-12-02 22:03:16 +00:00