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https://github.com/open-goal/jak-project.git
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8ba010ca97
* [WIP] initial sprite distort implementation * Clean up * More clean up + document sprite distort VU program * Format code * Address CI issues * Adjust hacks in distort fragment shader * oops * Optimize sprite distort rendering down to one draw call ~2x speed up * Format file * Clean up distort rendering and add separate profile scopes * Fix glVertexAttribPointer * Fix sprite distort getting messed up when the viewable area doesn't fit the window perfectly * Add debug option to disable sprite distort * One evil space to fail CI... * oops * Increase sprite-aux-list size when PC_BIG_MEMORY is true * Address lints
95 lines
5.7 KiB
Plaintext
95 lines
5.7 KiB
Plaintext
;; VU memory:
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;; 0: GS vertex data (buffer 1)
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;; 176: GS vertex data (buffer 2)
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;; 352: sinetables.entry[128]
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;; 480: sinetables.ientry[9]
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;; 489: sinetables.giftag
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;; 490: sinetables.color
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;; 511: num sprites
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;; 512: sprite data
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;; Init
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lq.xyzw vf01, 489(vi00) | nop ;; Load giftag
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lq.xyzw vf05, 490(vi00) | nop ;; Load color
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ilw.x vi01, 511(vi00) | nop ;; Load number of sprites
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iaddiu vi04, vi00, 0x200 | nop ;; Address of sprite data (512)
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iaddi vi02, vi00, 0x0 | nop
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;; Loop for each sprite
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L1:
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ilw.w vi07, 1(vi04) | nop ;; Get sprite.flag
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;; The flag represents the 'resolution' of the sprite,
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;; which is a circle. The vertices are constructed below
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;; by creating "pie-slices" of a circle where the number
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;; of slices is the value of flag. In practice, flag
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;; can range from 3-11.
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ior vi05, vi02, vi00 | nop
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ilw.x vi06, 477(vi07) | nop ;; Get ptr to sinetables.entry
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;; addr = sinetables.ientry[flag - 3]
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;; The smallest value of flag is 3 and 3 + 477 = 480,
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;; which is sinetables.ientry.
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;; The values in ientry are an index of entry + 352,
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;; which gives the address of an entry element.
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sqi.xyzw vf01, vi05 | nop ;; Write giftag to GS data
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iaddiu vi08, vi07, 0x4000 | nop
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iaddiu vi08, vi08, 0x4000 | nop
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isw.x vi08, -1(vi05) | nop ;; Set giftag.nloop to flag (number of slices)
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lqi.xyzw vf02, vi04 | nop ;; Get sprite.xyz
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lqi.xyzw vf03, vi04 | nop ;; Get sprite.st
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lqi.xyzw vf04, vi04 | nop ;; Get sprite.rgba
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nop | ftoi4.xyzw vf14, vf02
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;; Loop the number of times denoted by sprite.flag
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;; Here, we build the GS data for a single distort sprite
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L2:
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lqi.xyzw vf06, vi06 | nop ;; Load 4 sine table vectors
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lqi.xyzw vf07, vi06 | nop
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lq.xyzw vf08, 0(vi06) | nop
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lq.xyzw vf09, 1(vi06) | nop
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iaddi vi07, vi07, -0x1 | muly.xyzw vf10, vf06, vf04 ;; Decrement loop count
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nop | mulz.xyzw vf11, vf07, vf04 ;; Calculate vertex positions, texture coords, and color
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nop | muly.xyzw vf12, vf08, vf04
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nop | mulz.xyzw vf13, vf09, vf04
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nop | mulx.xyzw vf06, vf06, vf04
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nop | mulx.xyzw vf07, vf07, vf04
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nop | mulx.xyzw vf08, vf08, vf04
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nop | mulx.xyzw vf09, vf09, vf04
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nop | add.xyzw vf10, vf10, vf02
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nop | add.xyzw vf11, vf11, vf03
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nop | add.xyzw vf12, vf12, vf02
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nop | add.xyzw vf13, vf13, vf03
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nop | add.xyzw vf06, vf06, vf02
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nop | add.xyzw vf07, vf07, vf03
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nop | add.xyzw vf08, vf08, vf02
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nop | add.xyzw vf09, vf09, vf03
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nop | ftoi4.xyzw vf10, vf10
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nop | ftoi4.xyzw vf12, vf12
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nop | ftoi4.xyzw vf06, vf06
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nop | ftoi4.xyzw vf08, vf08
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sqi.xyzw vf07, vi05 | nop ;; Write the 5 vertexes for this "pie-slice" to GS data
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sqi.xyzw vf05, vi05 | nop
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sqi.xyzw vf06, vi05 | nop
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sqi.xyzw vf09, vi05 | nop
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sqi.xyzw vf05, vi05 | nop
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sqi.xyzw vf08, vi05 | nop
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sqi.xyzw vf11, vi05 | nop
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sqi.xyzw vf05, vi05 | nop
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sqi.xyzw vf10, vi05 | nop
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sqi.xyzw vf13, vi05 | nop
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sqi.xyzw vf05, vi05 | nop
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sqi.xyzw vf12, vi05 | nop
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sqi.xyzw vf03, vi05 | nop
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sqi.xyzw vf05, vi05 | nop
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ibne vi00, vi07, L2 | nop ;; Repeat for remaining slices
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sqi.xyzw vf14, vi05 | nop
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;; Finally, tell the GS to draw the current sprite and switch
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;; to the other buffer for the next sprite
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xgkick vi02 | nop ;; Draw sprite
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iaddi vi01, vi01, -0x1 | nop
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iaddiu vi03, vi00, 0xb0 | nop ;; Switch buffer
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ibne vi00, vi01, L1 | nop ;; Loop for remaining sprites
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isub vi02, vi03, vi02 | nop
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nop | nop :e
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nop | nop
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