Opened 3 weeks ago
#15486 new defect
TINYGL: triangles always override zbuffer from lines?
Reported by: | neuromancer | Owned by: | |
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Priority: | normal | Component: | Graphics |
Version: | Keywords: | ||
Cc: | Game: |
Description
It seems that when using TinyGL, rendering a line on top of a triangle can cause the line to be invisible, depending on the order of the rendering calls. In theory, the rendering order should not matter when depth testing/writing is enabled.
This can be reproduced in the freescape engine, removing workaround for this issue located here: https://github.com/scummvm/scummvm/compare/638af45da0ad...79f7d38f3694#diff-be1a69b059b2d0790b564279ad27cce15d58d9dfe2e7d9d6e9ef7c81c5f5c0f4R362-R373
To reproduce, modify the the affected code to render first planar, then non-planar objects:
for (auto &pair : offsetMap) { pair._key->draw(gfx, pair._value); } for (auto &obj : nonPlanarObjects) { obj->draw(gfx); }
Then, load the Total Eclipse CPC demo (https://downloads.scummvm.org/frs/demos/freescape/totaleclipse-cpc-demo.zip), switch the render to software, start the game and examine the plane from different angles.
I have attached two images with and without the workaround.
Attachments (2)
Change History (2)
by , 3 weeks ago
Attachment: | scummvm-totaleclipse-demo-cpc-00001.png added |
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by , 3 weeks ago
Attachment: | scummvm-totaleclipse-demo-cpc-00000.png added |
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