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36f18e5ac5
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.
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| .. | ||
| ADDING_NEW_TESTS | ||
| Makefile.am | ||
| test-actor-destroy.c | ||
| test-actor-invariants.c | ||
| test-actor-size.c | ||
| test-anchors.c | ||
| test-binding-pool.c | ||
| test-clutter-rectangle.c | ||
| test-clutter-text.c | ||
| test-clutter-units.c | ||
| test-cogl-backface-culling.c | ||
| test-cogl-blend-strings.c | ||
| test-cogl-fixed.c | ||
| test-cogl-materials.c | ||
| test-cogl-multitexture.c | ||
| test-cogl-npot-texture.c | ||
| test-cogl-offscreen.c | ||
| test-cogl-premult.c | ||
| test-cogl-readpixels.c | ||
| test-cogl-sub-texture.c | ||
| test-cogl-texture-mipmaps.c | ||
| test-cogl-vertex-buffer-contiguous.c | ||
| test-cogl-vertex-buffer-interleved.c | ||
| test-cogl-vertex-buffer-mutability.c | ||
| test-cogl-viewport.c | ||
| test-color.c | ||
| test-conform-common.c | ||
| test-conform-common.h | ||
| test-conform-main.c | ||
| test-group.c | ||
| test-launcher.sh | ||
| test-model.c | ||
| test-paint-opacity.c | ||
| test-path.c | ||
| test-pick.c | ||
| test-script-parser.c | ||
| test-text-cache.c | ||
| test-texture-fbo.c | ||
| test-timeline-interpolate.c | ||
| test-timeline-rewind.c | ||
| test-timeline.c | ||