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N64: Slightly optimise clipping path

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UnknownShadow200 2025-07-19 10:35:28 +10:00
parent 952824356e
commit 00a1a49405
1 changed files with 24 additions and 43 deletions
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53
misc/n64/rsp_gpu.S
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@ -66,7 +66,6 @@ GL_STATE:
.align 4
CLIP_CODE_FACTORS: .half 1, 1, GUARD_BAND_FACTOR, GUARD_BAND_FACTOR
DRAW_TRI_RA: .word 0
.bss
.align 3
@ -371,6 +370,7 @@ GPUCmd_DrawQuad:
#define v1_cflags t2
#define v2_cflags t3
#define v3_cflags t4
// t5 is used by GL_ClipTriangle
addi src_ptr, rspq_dmem_buf_ptr, %lo(RSPQ_DMEM_BUFFER) - 64
li vtx, %lo(VERTEX_CACHE)
@ -493,11 +493,6 @@ GPUCmd_DrawQuad:
#undef vcspos_i
#undef vcspos_f
#define vtx1 a1
#define vtx2 a2
#define vtx3 a3
#define vtx4 a0
// ########################
// Trivial rejection check
// ########################
@ -534,43 +529,30 @@ GPUCmd_DrawQuad:
or tmp, v2_cflags
or tmp, v3_cflags
beqz tmp, DrawQuadForRDP
nop
#undef tmp
#undef v0_cflags
#undef v1_cflags
#undef v2_cflags
#undef v3_cflags
// If all 4 vertices are inside guardband, no need to clip
beqz tmp, DrawQuadForRDP
move t5, tmp // GL_ClipTriangle expects this in t5 instead
#undef tmp
// ###########################
// Slow clipped triangle path
// Slow clipped triangles path
// ###########################
li a1, %lo(VERTEX_CACHE) + V0_OFFSET
li a2, %lo(VERTEX_CACHE) + V1_OFFSET
li a3, %lo(VERTEX_CACHE) + V2_OFFSET
jal DrawClippedQuad
li a0, %lo(VERTEX_CACHE) + V3_OFFSET
#define vtx1 a1
#define vtx2 a2
#define vtx3 a3
#define vtx4 a0
j RSPQ_Loop
nop
.endfunc
################################################################
# DrawClippedTriangle - Breaks a triangle into one or more clipped tris
################################################################
.func DrawClippedQuad
DrawClippedQuad:
sw ra, %lo(DRAW_TRI_RA) // TODO find a register for this
lbu t0, SCREEN_VTX_CLIP_CODE(vtx1)
lbu t1, SCREEN_VTX_CLIP_CODE(vtx2)
lbu t2, SCREEN_VTX_CLIP_CODE(vtx3)
lbu t3, SCREEN_VTX_CLIP_CODE(vtx4)
or t5, t0, t1
or t5, t2
or t5, t3
li vtx1, %lo(VERTEX_CACHE) + V0_OFFSET
li vtx2, %lo(VERTEX_CACHE) + V1_OFFSET
li vtx3, %lo(VERTEX_CACHE) + V2_OFFSET
li vtx4, %lo(VERTEX_CACHE) + V3_OFFSET
// t5 = which guardband planes need to be clipped against
move s1, zero
jal GL_ClipTriangle
move s2, zero
@ -600,8 +582,7 @@ gl_draw_single_triangle:
addi s1, 2
gl_draw_triangle_end:
lw ra, %lo(DRAW_TRI_RA)
jr ra
j RSPQ_Loop
nop
.endfunc