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Document lines with overlapping vertices

This commit is contained in:
wheremyfoodat 2022-08-29 04:16:43 +03:00
parent 9db9fafd62
commit bc58f2b8dc
2 changed files with 5 additions and 4 deletions
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6
docs/cpuspecifications.md
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@ -351,12 +351,12 @@ Note that the instruction following the branch will always be executed.<br/>
bgez rs,dest if rs>=0 then pc=$+4+(-8000h..+7FFFh)*4 bgez rs,dest if rs>=0 then pc=$+4+(-8000h..+7FFFh)*4
bgtz rs,dest if rs>0 then pc=$+4+(-8000h..+7FFFh)*4 bgtz rs,dest if rs>0 then pc=$+4+(-8000h..+7FFFh)*4
blez rs,dest if rs<=0 then pc=$+4+(-8000h..+7FFFh)*4 blez rs,dest if rs<=0 then pc=$+4+(-8000h..+7FFFh)*4
bltzal rs,dest ra=$+8; if rs<0 then pc=$+4+(..)*4 bltzal rs,dest if rs<0 then pc=$+4+(..)*4; ra=$+8;
bgezal rs,dest ra=$+8; if rs>=0 then pc=$+4+(..)*4 bgezal rs,dest if rs>=0 then pc=$+4+(..)*4; ra=$+8;
``` ```
jr/jalr can be used to jump to an unaligned address, in which case an address error (AdEL) exception will be raised on the next instruction fetch.<br/> jr/jalr can be used to jump to an unaligned address, in which case an address error (AdEL) exception will be raised on the next instruction fetch.<br/>
Additionally, bltzal/bgezal will always place the return address in $ra, whether or not the branch is taken<br/> Additionally, bltzal/bgezal will always place the return address in $ra, whether or not the branch is taken. Additionally, if `rs` is $ra, then the value used for the comparison is $ra's value before linking.<br/>
#### JALR cautions #### JALR cautions
Caution: The JALR source code syntax varies (IDT79R3041 specs say "jalr rs,rd", Caution: The JALR source code syntax varies (IDT79R3041 specs say "jalr rs,rd",

3
docs/graphicsprocessingunitgpu.md
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@ -231,8 +231,9 @@ Vertex YYYYXXXX - required, two signed 16 bits values
When polyline mode is active, at least two vertices must be sent to the GPU. When polyline mode is active, at least two vertices must be sent to the GPU.
The vertex list is terminated by the bits 12-15 and 28-31 equaling `0x5`, or The vertex list is terminated by the bits 12-15 and 28-31 equaling `0x5`, or
`(word & 0xF000F000) == 0x50005000`. The terminator value occurs on the first `(word & 0xF000F000) == 0x50005000`. The terminator value occurs on the first
word of the vertex (i.e. the color word if it's a gouraud shaded). word of the vertex (i.e. the color word if it's a gouraud shaded).<br/>
If the 2 vertices in a line overlap, then the GPU will draw a 1x1 rectangle in the location of the 2 vertices using the colour of the first vertex.
#### Note #### Note
Lines are displayed up to \<including\> their lower-right coordinates (ie. Lines are displayed up to \<including\> their lower-right coordinates (ie.