271 lines
6.1 KiB
NASM
271 lines
6.1 KiB
NASM
include "inc/F3DEX2.inc"
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include "inc/dlist.inc"
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constant FOV90(0)
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macro _g(variable c, variable a, variable b) {
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WriteDL((c << 24) | a, b)
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}
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framecount:
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dw 0
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SmoothStep16:
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// a0: s15.16?
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// v0: s15.16
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// v1: lower 16 bits
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// t9 = abs(a0)
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bgez a0,+
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addu t9, r0, a0
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subu t9, r0, a0
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+
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// t9 = triangle_wave(t9)
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// note that every minimum and maximum value is repeated once
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li t0, 0x1FFFF // period of 2
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and t9, t0
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lli t0, 0xFFFF
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subu t9, t0, t9
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bgez t9,+
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subiu t1, r0, 1
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subu t9, t1, t9
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+
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subu t9, t0, t9
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// t8 = t9 * t9
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multu t9, t9
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mflo t8
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srl t8, 16
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// t7 = 3 - 2 * t9
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sll t7, t9, 1 // times two
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subu t7, r0, t7 // negate
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li t0, 3 << 16
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addu t7, t0
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// t6 = t8 * t7
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// instead do a u0.15 * u2.15 multiply to avoid overflow:
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srl t8, 1
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srl t7, 1
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multu t8, t7
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mflo t6
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srl v0, t6, 14
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sll v1, t6, 1
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jr ra
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nop
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WriteDList:
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// a0: pointer to receive F3DZEX instructions
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// a1: use alt color buffer (boolean)
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subiu sp, 0x20
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sw ra, 0x10(sp)
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sw s0, 0x14(sp)
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sw s1, 0x18(sp)
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sw s2, 0x1C(sp)
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bnez a1,+
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nop
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la a1, VIDEO_C_IMAGE
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j ++
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nop
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+
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la a1, VIDEO_C_IMAGE_ALT
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+
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or s0, a0, r0
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or s1, a1, r0
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// move the object around based on framecount
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la t8, framecount
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lw t9, 0(t8)
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sll a0, t9, 16 + 7
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srl a0, 15
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jal SmoothStep16
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nop
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or s2, v0, r0
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la t8, framecount
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lw t9, 0(t8)
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sll a0, t9, 16 + 7
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srl a0, 15
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jal SmoothStep16
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subiu a0, 0x7FFF
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subu s2, r0, s2
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addiu s2, 0x7FFF
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sll s2, 1
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subu v0, r0, v0
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addiu v0, 0x7FFF
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sll v0, 1
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// s2: cos-like
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// v0: sin-like
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la t8, view_mat1
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sh s2, MAT_XX_FRAC(t8)
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sra t9, s2, 16
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sh t9, MAT_XX(t8)
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subu v0, r0, v0
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sh v0, MAT_XZ_FRAC(t8)
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sra t9, v0, 16
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sh t9, MAT_XZ(t8)
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subu v0, r0, v0
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sh v0, MAT_ZX_FRAC(t8)
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sra t9, v0, 16
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sh t9, MAT_ZX(t8)
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sh s2, MAT_ZZ_FRAC(t8)
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sra t9, s2, 16
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sh t9, MAT_ZZ(t8)
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or a0, s0, r0
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// init
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gPipeSync()
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gSetSegment0(0) // set to 0 so that 00-prefixed addresses are absolute.
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gTextureOff()
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gSetCombine(15,15,31,4,7,7,7,4, 15,15,31,4,7,7,7,4)
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gSetScissor(0, 0, 0, WIDTH, HEIGHT) // TODO: use mode enum
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gSetBlendColor(0,0,0,0)
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gClipRatio(2)
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gSetZImage(VIDEO_Z_IMAGE)
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// this overwrites our color image address so we must do it first:
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gClearZImage(WIDTH, HEIGHT, VIDEO_Z_IMAGE)
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gPipeSync()
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WriteCB(G_SETCIMB_UPPER_WORD | (WIDTH - 1), s1)
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if HICOLOR {
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gSetFillColor(0x444444FF) // dark gray
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} else {
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gSetFillColor(0x42114211) // dark gray
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}
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gFillRect(0, 0, WIDTH - 1, HEIGHT - 1)
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gPipeSync()
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if HICOLOR {
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gSetFillColor(0xFFFFFFFF) // white
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} else {
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gSetFillColor(0xFFFFFFFF) // white
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}
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gPipeSync()
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// note that all the coordinates are inclusive!
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if HIRES {
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gFillRect(312, 232, 327, 247)
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} else {
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gFillRect(156, 116, 163, 123)
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}
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gPipeSync()
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gViewport(viewport)
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gPerspNorm(PERSPECTIVE_NORMALIZATION)
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gMatrix(view_mat0, G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_PROJECTION)
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gMatrix(view_mat1, G_MTX_NOPUSH | G_MTX_MUL | G_MTX_PROJECTION)
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gPipeSync()
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gSetCombine(15,15,31,4,7,7,7,4, 15,15,31,4,7,7,7,4)
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gSetOtherMode(G_PM_NPRIMITIVE | G_CYC_1CYCLE | G_TP_NONE | G_TD_CLAMP | G_TL_TILE | G_TT_NONE | G_TF_AVERAGE | G_TC_FILT | G_CK_NONE | G_CD_MAGICSQ | G_AD_PATTERN, G_AC_NONE | G_ZS_PIXEL | Z_CMP | Z_UPD)
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// CULL_FRONT is dying on N64?
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gGeometryMode(0, G_ZBUFFER | G_SHADE | G_CULL_FRONT | G_SHADING_SMOOTH)
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gSetSegment6(model)
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gMatrix(model_mat, G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW)
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gDisplayList((6 << 24) | MODEL_START)
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// finish.
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gFullSync()
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gEndList()
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la t8, framecount
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lw t9, 0(t8)
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addiu t9, 1
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sw t9, 0(t8)
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lw ra, 0x10(sp)
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lw s0, 0x14(sp)
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lw s1, 0x18(sp)
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lw s2, 0x1C(sp)
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jr ra
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addiu sp, 0x20
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print {dpos} / 8, "\n"
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align(8)
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viewport:
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// note that the third parameters here affect the range of Z-buffering.
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dh WIDTH/2*4, HEIGHT/2*4, 0x3FF, 0 // scale
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dh WIDTH/2*4, HEIGHT/2*4, 0x000, 0 // translation
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view_mat0:
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if FOV90 {
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Mat.X($0000'C000, $0000'0000, $0000'0000, $0000'0000)
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Mat.Y($0000'0000, $0001'0000, $0000'0000, $0000'0000)
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} else {
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Mat.X($0001'4C8D, $0000'0000, $0000'0000, $0000'0000)
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Mat.Y($0000'0000, $0001'BB67, $0000'0000, $0000'0000)
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}
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Mat.Z($0000'0000, $0000'0000, $FFFE'FF00, $FFFF'0000)
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Mat.W($0000'0000, $0000'0000, $FFFD'FF00, $0000'0000)
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Mat.rix()
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constant PERSPECTIVE_NORMALIZATION($00FF)
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view_mat1:
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Mat.X($0001'0000, $0000'0000, $0000'0000, $0000'0000)
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Mat.Y($0000'0000, $0001'0000, $0000'0000, $0000'0000)
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Mat.Z($0000'0000, $0000'0000, $0001'0000, $0000'0000)
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if FOV90 {
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Mat.W($0000'0000, $FFD4'0000, $FF80'0000, $0001'0000)
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} else {
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Mat.W($0000'0000, $FFD4'0000, $FF40'0000, $0001'0000)
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}
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Mat.rix()
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model_mat:
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MatObject(0,0,0, 0x0800)
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identity:
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MatEye()
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macro _g(variable c, variable a, variable b) {
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dw (c << 24) | a, b
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}
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if 0 {
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model: // a colorful cube
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constant S(0x400)
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// TODO: write a macro for this struct
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dh -S, -S, -S, 0, 0, 0, 0x0000, 0x00FF
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dh -S, -S, +S, 0, 0, 0, 0x0000, 0xFFFF
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dh -S, +S, -S, 0, 0, 0, 0x00FF, 0x00FF
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dh -S, +S, +S, 0, 0, 0, 0x00FF, 0xFFFF
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dh +S, -S, -S, 0, 0, 0, 0xFF00, 0x00FF
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dh +S, -S, +S, 0, 0, 0, 0xFF00, 0xFFFF
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dh +S, +S, -S, 0, 0, 0, 0xFFFF, 0x00FF
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dh +S, +S, +S, 0, 0, 0, 0xFFFF, 0xFFFF
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constant MODEL_START(pc() - model)
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gPipeSync()
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gVertex(0x06000000, 8, 0)
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gQuadTri(0, 1, 3, 2)
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gQuadTri(1, 5, 7, 3)
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gQuadTri(5, 4, 6, 7)
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gQuadTri(4, 0, 2, 6)
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gQuadTri(4, 5, 1, 0)
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gQuadTri(2, 3, 7, 6)
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gEndList()
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} else {
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constant MODEL_START(0x32B0)
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insert model, "res/teapot.F3D"
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}
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