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cobra.c: Latest research (nw)
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Ville Linde
parent
27d8a12745
commit
990898dcf1
@ -171,28 +171,104 @@
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0xb0 0xb4 0xb8 0xbc
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0x00114: High word: framebuffer pitch? Low word: framebuffer pixel size?
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0x00118: High word: FB pixel read X pos, Low word: FB pixel read Y pos
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0x00118: xxxxxxxx xxxxxxxx -------- -------- Framebuffer pixel read X pos
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-------- -------- xxxxxxxx xxxxxxxx Framebuffer pixel read Y pos
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0x0011c: Same as above?
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0x00458: Set to 0x02100000 (0xff) by texselect()
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0x40018: Set to 0x0001040a (0xc0) by mode_stipple()
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0x02904: -------- ------xx xx------ -------- Tex mag filter?
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-------- -------- --xxxx-- -------- Tex min filter?
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0x02908: -------- ----xxx- -------- -------- Tex wrap S (0 = repeat, 1 = mirror, 2 = clamp)
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-------- -------x xx------ -------- Tex wrap T
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0x02910: xxxx---- -------- -------- -------- Texture width shift (size = 1 << X)
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----xxxx -------- -------- -------- Texture height shift (size = 1 << X)
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-------- ----x--- -------- -------- ?
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-------- -------- -x------ -------- ?
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-------- -------- -------- xxx----- Texture format (texel size, 2 = 4-bit, 3 = 8-bit, 4 = 16-bit)
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-------- -------- -------- ---xxx-- Texture format param
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0x02914: --xxxxxx xxxxxxxx xx------ -------- ? (texture param, set to 0x1243)
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0x40018: Set to 0x0001040a (0xc0) by mode_stipple() (bits 24..27 = stipple pattern?)
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0x400d0: Set to 0x80000000 (0x80) by mode_stipple()
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0x400f4: Set to 0x40000000 (0x80) by texselect()
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0x40114: Set to 0x00080000 (0x10) by mode_scissor()
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0x40138: Set to 0x88800000 (0xe0) by mode_viewclip()
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0x40160: Some viewport register? (high word: 192, low word: 150)
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0x40164: Some viewport register? (high word: 352, low word: 275)
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0x40170: Some viewport register? (high word: 160, low word: 125)
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0x40174: Some viewport register? (high word: 320, low word: 250)
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0x40198: Set to 0x80800000 (0xa0) by mode_alphatest()
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0x4019c: Set to 0x88000000 (0xc0) by mode_fog()
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0x8001c: Set to 0xc1d60060 (0xfe) by mode_stenciltest()
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0x80020: Set to 0x00020000 (0x10) by mode_depthtest()
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0x80050: Set to 0x04445500 (0x7c) by mode_blend()
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0x40160: xxxxxxxx xxxxxxxx -------- -------- Scissor Left
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-------- -------- xxxxxxxx xxxxxxxx Scissor Top
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0x40164: xxxxxxxx xxxxxxxx -------- -------- Scissor Right
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-------- -------- xxxxxxxx xxxxxxxx Scissor Bottom
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0x40170: xxxxxxxx xxxxxxxx -------- -------- Viewport Left
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-------- -------- xxxxxxxx xxxxxxxx Viewport Top
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0x40174: xxxxxxxx xxxxxxxx -------- -------- Viewport Right
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-------- -------- xxxxxxxx xxxxxxxx Viewport Bottom
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0x40198: x------- -------- -------- -------- Alpha test enable?
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-------- xxx----- -------- -------- Alpha test function (0 = never, 1 = less, 2 = lequal, 3 = greater,
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4 = gequal, 5 = equal, 6 = notequal, 7 = always)
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0x4019c: Set to 0x88000000 (0xc0) by mode_fog() (bit 31: 0 = linear fog, 1 = table fog)
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0x401bc: Texture env mode
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xxx----- -------- -------- -------- ?
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---xxx-- -------- -------- -------- ?
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0x8001c: (mask 0xfe) 0xc1d60060 = (not equal, 6) Stencil register
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0xca9b0010 = (not equal, 1)
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0x037dfff0 = (never)
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0x2616fff0 = (greater)
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0x459cfff0 = (greater/equal)
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0x6672fff0 = (less)
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0x8827fff0 = (less/equal)
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0xa92b0100 = (equal, 16)
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-------- -------- xxxxxxxx xxxx---- Stencil reference value?
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xxx----- -------- -------- -------- Stencil function?
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0x80020: -------- ----xxx- -------- -------- Depth test function (7 = always?)
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0x80050: (mask 0x7c) 0x04445500 = (As, 1-As) Blend register
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0x04111100 = (1, 1)
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0x04441100 = (As, 1)
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0x04114400 = (1, As)
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0x04681100 = (Cd, 1)
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0x04680000 = (Cd, 0)
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0x04002400 = (0, Cs)
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0x04e11100 = (Ad, 1-Ad)
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0x04889900 = (pseudo-fog)
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-----x-- -------- -------- -------- Blend enable?
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-------- xxxx---- -------- -------- source factor?
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-------- ----xxxx -------- -------- source?
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-------- -------- xxxx---- -------- dest factor?
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-------- -------- ----xxxx -------- dest?
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0x80054: Set to 0x02400000 (0xe0) by mode_stencilmod()
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0x800a4: x------- -------- -------- -------- Logic op enable?
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-----xxx x------- -------- -------- Logic op (0 = clear, 1 = and, 2 = and reverse, 3 = copy,
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4 = and inverted, 5 = noop, 6 = xor, 7 = or inverted,
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8 = nor, 9 = equiv, 10 = invert, 11 = or reverse,
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12 = copy inverted, 13 = or inverted, 14 = nand, 15 = set)
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0x80114: (0xcc) by mode_colormask()
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0x80118: (0xcc) by mode_colormask()
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0x8011c: (0xe0) by mode_stencilmask()
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0x8011c: xxxxxxxx xxxx---- -------- -------- Stencil mask
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0x80120: -------- -------- xxxxxxxx xxxxxxxx Depth mask register
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0xc0c00..fff: Texture RAM readback
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0xc3020: Start address for texram writes?
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0xc3028: Reads address from texram?
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@ -233,10 +309,6 @@ public:
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m_zbuffer = auto_bitmap_ind32_alloc(machine, 1024, 1024);
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m_stencil = auto_bitmap_ind32_alloc(machine, 1024, 1024);
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// TODO: these are probably set by some 3D registers
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m_texture_width = 128;
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m_texture_height = 8;
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m_gfx_regmask = auto_alloc_array(machine, UINT32, 0x100);
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for (int i=0; i < 0x100; i++)
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{
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@ -275,8 +347,6 @@ private:
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bitmap_ind32 *m_stencil;
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UINT32 *m_texture_ram;
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int m_texture_width;
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int m_texture_height;
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UINT32 *m_gfx_gram;
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UINT32 *m_gfx_regmask;
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@ -435,15 +505,18 @@ void cobra_renderer::render_texture_scan(INT32 scanline, const extent_t &extent,
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float dv = extent.param[1].dpdx;
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UINT32 *fb = &m_framebuffer->pix32(scanline);
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int texture_width = 1 << ((m_gfx_gram[0x2910/4] >> 28) & 0xf);
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int texture_height = 1 << ((m_gfx_gram[0x2910/4] >> 24) & 0xf);
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for (int x = extent.startx; x < extent.stopx; x++)
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{
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int iu, iv;
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UINT32 texel;
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iu = (int)(u * m_texture_width);
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iv = (int)(v * m_texture_height);
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iu = (int)(u * texture_width);
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iv = (int)(v * texture_height);
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texel = m_texture_ram[((iv * m_texture_width) + iu) / 2];
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texel = m_texture_ram[((iv * texture_width) + iu) / 2];
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if (iu & 1)
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{
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@ -1377,6 +1450,7 @@ static void sub_unknown_dma_w(device_t *device, int width, UINT32 data)
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static ADDRESS_MAP_START( cobra_sub_map, AS_PROGRAM, 32, cobra_state )
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AM_RANGE(0x00000000, 0x003fffff) AM_MIRROR(0x80000000) AM_RAM // Main RAM
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AM_RANGE(0x70000000, 0x7003ffff) AM_MIRROR(0x80000000) AM_READWRITE(sub_comram_r, sub_comram_w) // Double buffered shared RAM between Main and Sub
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// AM_RANGE(0x78000000, 0x780000ff) AM_MIRROR(0x80000000) AM_NOP // SCSI controller (unused)
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AM_RANGE(0x78040000, 0x7804ffff) AM_MIRROR(0x80000000) AM_DEVREADWRITE16_LEGACY("rfsnd", rf5c400_r, rf5c400_w, 0xffffffff)
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AM_RANGE(0x78080000, 0x7808000f) AM_MIRROR(0x80000000) AM_READWRITE(sub_ata0_r, sub_ata0_w)
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AM_RANGE(0x780c0010, 0x780c001f) AM_MIRROR(0x80000000) AM_READWRITE(sub_ata1_r, sub_ata1_w)
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@ -1533,6 +1607,7 @@ void cobra_renderer::gfx_fifo_exec(running_machine &machine)
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w2 = cobra->m_gfx_re_command_word2;
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}
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switch ((w1 >> 24) & 0xff)
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{
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@ -1650,7 +1725,7 @@ void cobra_renderer::gfx_fifo_exec(running_machine &machine)
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// 0x00: -------- -------- -------- xxxxxxxx Number of units (amount of bits is uncertain)
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//
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// 0x01: -x------ -------- -------- -------- Has extra flags word (used by lines only)
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// 0x01: --x----- -------- -------- -------- Has extra unknown float
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// 0x01: --x----- -------- -------- -------- Has extra unknown float (seems to be fog-related?)
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// 0x01: ---x---- -------- -------- -------- Always 1?
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// 0x01: -------- xx------ -------- -------- ?
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// 0x01: -------- --x----- -------- -------- Has texture coords
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@ -1697,11 +1772,11 @@ void cobra_renderer::gfx_fifo_exec(running_machine &machine)
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fifo_in->pop(NULL, &vert[i].x); // X coord
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fifo_in->pop(NULL, &vert[i].y); // Y coord
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fifo_in->pop(NULL, &in); // coord?
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fifo_in->pop(NULL, &in); // coord?
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fifo_in->pop(NULL, &in); // Z coord
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if (w2 & 0x00200000) // texture coords
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{
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fifo_in->pop(NULL, &in); // ? (float 0.0f ... 1.0f)
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fifo_in->pop(NULL, &in); // W coord (1 / Z)
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fifo_in->pop(NULL, &vert[i].p[0]); // U coord
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fifo_in->pop(NULL, &vert[i].p[1]); // V coord
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}
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@ -1862,6 +1937,9 @@ void cobra_renderer::gfx_fifo_exec(running_machine &machine)
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}
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}
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// flush fifo_out so we have fresh data at top
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fifo_out->flush();
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fifo_out->push(NULL, buffer[x+0]);
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fifo_out->push(NULL, buffer[x+1]);
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fifo_out->push(NULL, buffer[x+2]);
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