// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/*************************************************************************
Driver for Gaelco 3D games
driver by Aaron Giles
**************************************************************************/
#include "emu.h"
#include "includes/gaelco3d.h"
#include "cpu/tms32031/tms32031.h"
#include "video/rgbutil.h"
#define MAX_POLYGONS 4096
#define MAX_POLYDATA (MAX_POLYGONS * 21)
#define MAX_VERTICES 32
#define DISPLAY_TEXTURE 0
#define LOG_POLYGONS 0
#define DISPLAY_STATS 0
#define IS_POLYEND(x) (((x) ^ ((x) >> 1)) & 0x4000)
gaelco3d_state::gaelco3d_renderer::gaelco3d_renderer(gaelco3d_state &state)
: poly_manager<float, gaelco3d_object_data, 1, 2000>(state.machine()),
m_state(state),
m_screenbits(state.m_screen->width(), state.m_screen->height()),
m_zbuffer(state.m_screen->width(), state.m_screen->height()),
m_polygons(0),
m_texture_size(state.memregion("gfx1")->bytes()),
m_texmask_size(state.memregion("gfx2")->bytes() * 8),
m_texture(std::make_unique<uint8_t[]>(m_texture_size)),
m_texmask(std::make_unique<uint8_t[]>(m_texmask_size))
{
state.machine().save().save_item(NAME(m_screenbits));
state.machine().save().save_item(NAME(m_zbuffer));
/* first expand the pixel data */
uint8_t *src = state.memregion("gfx1")->base();
uint8_t *dst = m_texture.get();
for (int y = 0; y < m_texture_size/4096; y += 2)
for (int x = 0; x < 4096; x += 2)
{
dst[(y + 0) * 4096 + (x + 1)] = src[0*m_texture_size/4 + (y/2) * 2048 + (x/2)];
dst[(y + 1) * 4096 + (x + 1)] = src[1*m_texture_size/4 + (y/2) * 2048 + (x/2)];
dst[(y + 0) * 4096 + (x + 0)] = src[2*m_texture_size/4 + (y/2) * 2048 + (x/2)];
dst[(y + 1) * 4096 + (x + 0)] = src[3*m_texture_size/4 + (y/2) * 2048 + (x/2)];
}
/* then expand the mask data */
src = state.memregion("gfx2")->base();
dst = m_texmask.get();
for (int y = 0; y < m_texmask_size/4096; y++)
for (int x = 0; x < 4096; x++)
dst[y * 4096 + x] = (src[(x / 1024) * (m_texmask_size/8/4) + (y * 1024 + x % 1024) / 8] >> (x % 8)) & 1;
}
/*************************************
*
* Video init
*
*************************************/
void gaelco3d_state::video_start()
{
m_poly = std::make_unique<gaelco3d_renderer>(*this);
m_palette = std::make_unique<rgb_t[]>(32768);
m_polydata_buffer = std::make_unique<uint32_t[]>(MAX_POLYDATA);
/* save states */
save_pointer(NAME(m_palette), 32768);
save_pointer(NAME(m_polydata_buffer), MAX_POLYDATA);
save_item(NAME(m_polydata_count));
save_item(NAME(m_lastscan));
}
/*************************************
*
* Polygon rendering
*
*************************************/
/*
Polygon data stream format:
data[0] (float) = scale factor to map Z to fixed Z buffer value
data[1] (float) = dvoz/dy (change in v/z per Y)
data[2] (float) = dvoz/dx (change in v/z per X)
data[3] (float) = dooz/dy (change in 1/z per Y)
data[4] (float) = dooz/dx (change in 1/z per X)
data[5] (float) = duoz/dy (change in u/z per Y)
data[6] (float) = duoz/dx (change in u/z per X)
data[7] (float) = voz origin (value of v/z at coordinate (0,0))
data[8] (float) = ooz origin (value of 1/z at coordinate (0,0))
data[9] (float) = uoz origin (value of u/z at coordinate (0,0))
data[10] (int) = palette base (bits 14-8)
data[11] (int) = texture address
data[12] (int) = start point (bits 15-8 = X coordinate, bits 12-0 = Y coordinate)
data[13] (int) = next point (bits 15-8 = X coordinate, bits 12-0 = Y coordinate)
data[14] (int) = 16.16 dx/dy from previous point to this point
(repeat these two for each additional point in the fan)
*/
void gaelco3d_state::gaelco3d_renderer::render_poly(screen_device &screen, uint32_t *polydata)
{
float midx = screen.width() / 2;
float midy = screen.height() / 2;
float z0 = tms3203x_device::fp_to_float(polydata[0]);
float voz_dy = tms3203x_device::fp_to_float(polydata[1]) * 256.0f;
float voz_dx = tms3203x_device::fp_to_float(polydata[2]) * 256.0f;
float ooz_dy = tms3203x_device::fp_to_float(polydata[3]);
float ooz_dx = tms3203x_device::fp_to_float(polydata[4]);
float uoz_dy = tms3203x_device::fp_to_float(polydata[5]) * 256.0f;
float uoz_dx = tms3203x_device::fp_to_float(polydata[6]) * 256.0f;
float voz_base = tms3203x_device::fp_to_float(polydata[7]) * 256.0f - midx * voz_dx - midy * voz_dy;
float ooz_base = tms3203x_device::fp_to_float(polydata[8]) - midx * ooz_dx - midy * ooz_dy;
float uoz_base = tms3203x_device::fp_to_float(polydata[9]) * 256.0f - midx * uoz_dx - midy * uoz_dy;
gaelco3d_object_data &object = object_data_alloc();
int color = (polydata[10] & 0x7f) << 8;
vertex_t vert[MAX_VERTICES];
uint32_t data;
int vertnum;
if (LOG_POLYGONS)
{
int t;
m_state.logerror("poly: %12.2f %12.2f %12.2f %12.2f %12.2f %12.2f %12.2f %12.2f %12.2f %12.2f %08X %08X (%4d,%4d) %08X",
(double)tms3203x_device::fp_to_float(polydata[0]),
(double)tms3203x_device::fp_to_float(polydata[1]),
(double)tms3203x_device::fp_to_float(polydata[2]),
(double)tms3203x_device::fp_to_float(polydata[3]),
(double)tms3203x_device::fp_to_float(polydata[4]),
(double)tms3203x_device::fp_to_float(polydata[5]),
(double)tms3203x_device::fp_to_float(polydata[6]),
(double)tms3203x_device::fp_to_float(polydata[7]),
(double)tms3203x_device::fp_to_float(polydata[8]),
(double)tms3203x_device::fp_to_float(polydata[9]),
polydata[10],
polydata[11],
(int16_t)(polydata[12] >> 16), (int16_t)(polydata[12] << 2) >> 2, polydata[12]);
m_state.logerror(" (%4d,%4d) %08X %08X", (int16_t)(polydata[13] >> 16), (int16_t)(polydata[13] << 2) >> 2, polydata[13], polydata[14]);
for (t = 15; !IS_POLYEND(polydata[t - 2]); t += 2)
m_state.logerror(" (%4d,%4d) %08X %08X", (int16_t)(polydata[t] >> 16), (int16_t)(polydata[t] << 2) >> 2, polydata[t], polydata[t+1]);
m_state.logerror("\n");
}
/* fill in object data */
object.tex = polydata[11];
object.color = color;
object.ooz_dx = ooz_dx;
object.ooz_dy = ooz_dy;
object.ooz_base = ooz_base;
object.uoz_dx = uoz_dx;
object.uoz_dy = uoz_dy;
object.uoz_base = uoz_base;
object.voz_dx = voz_dx;
object.voz_dy = voz_dy;
object.voz_base = voz_base;
object.z0 = z0;
/* extract vertices */
data = 0;
for (vertnum = 0; vertnum < ARRAY_LENGTH(vert) && !IS_POLYEND(data); vertnum++)
{
/* extract vertex data */
data = polydata[13 + vertnum * 2];
vert[vertnum].x = midx + (float)((int32_t)data >> 16) + 0.5f;
vert[vertnum].y = midy + (float)((int32_t)(data << 18) >> 18) + 0.5f;
}
/* if we have a valid number of verts, render them */
if (vertnum >= 3)
{
const rectangle &visarea = screen.visible_area();
/* special case: no Z buffering and no perspective correction */
if (color != 0x7f00 && z0 < 0 && ooz_dx == 0 && ooz_dy == 0)
render_triangle_fan(visarea, render_delegate(&gaelco3d_renderer::render_noz_noperspective, this), 0, vertnum, &vert[0]);
/* general case: non-alpha blended */
else if (color != 0x7f00)
render_triangle_fan(visarea, render_delegate(&gaelco3d_renderer::render_normal, this), 0, vertnum, &vert[0]);
/* color 0x7f seems to be hard-coded as a 50% alpha blend */
else
render_triangle_fan(visarea, render_delegate(&gaelco3d_renderer::render_alphablend, this), 0, vertnum, &vert[0]);
m_polygons += vertnum - 2;
}
}
void gaelco3d_state::gaelco3d_renderer::render_noz_noperspective(int32_t scanline, const extent_t &extent, const gaelco3d_object_data &object, int threadid)
{
float zbase = recip_approx(object.ooz_base);
float uoz_step = object.uoz_dx * zbase;
float voz_step = object.voz_dx * zbase;
int zbufval = (int)(-object.z0 * zbase);
offs_t endmask = m_texture_size - 1;
const rgb_t *palsource = m_state.m_palette.get() + object.color;
uint32_t tex = object.tex;
uint16_t *dest = &m_screenbits.pix16(scanline);
uint16_t *zbuf = &m_zbuffer.pix16(scanline);
int startx = extent.startx;
float uoz = (object.uoz_base + scanline * object.uoz_dy + startx * object.uoz_dx) * zbase;
float voz = (object.voz_base + scanline * object.voz_dy + startx * object.voz_dx) * zbase;
int x;
for (x = startx; x < extent.stopx; x++)
{
int u = (int)uoz;
int v = (int)voz;
int pixeloffs = (tex + (v >> 8) * 4096 + (u >> 8)) & endmask;
if (pixeloffs >= m_texmask_size || !m_texmask[pixeloffs])
{
uint32_t rgb00 = palsource[m_texture[pixeloffs]];
uint32_t rgb01 = palsource[m_texture[(pixeloffs + 1) & endmask]];
uint32_t rgb10 = palsource[m_texture[(pixeloffs + 4096) & endmask]];
uint32_t rgb11 = palsource[m_texture[(pixeloffs + 4097) & endmask]];
const uint32_t filtered = rgbaint_t::bilinear_filter(rgb00, rgb01, rgb10, rgb11, u, v);
dest[x] = (filtered & 0x1f) | ((filtered & 0x1ff800) >> 6);
zbuf[x] = zbufval;
}
/* advance texture params to the next pixel */
uoz += uoz_step;
voz += voz_step;
}
}
void gaelco3d_state::gaelco3d_renderer::render_normal(int32_t scanline, const extent_t &extent, const gaelco3d_object_data &object, int threadid)
{
float ooz_dx = object.ooz_dx;
float uoz_dx = object.uoz_dx;
float voz_dx = object.voz_dx;
offs_t endmask = m_texture_size - 1;
const rgb_t *palsource = m_state.m_palette.get() + object.color;
uint32_t tex = object.tex;
float z0 = object.z0;
uint16_t *dest = &m_screenbits.pix16(scanline);
uint16_t *zbuf = &m_zbuffer.pix16(scanline);
int startx = extent.startx;
float ooz = object.ooz_base + scanline * object.ooz_dy + startx * ooz_dx;
float uoz = object.uoz_base + scanline * object.uoz_dy + startx * uoz_dx;
float voz = object.voz_base + scanline * object.voz_dy + startx * voz_dx;
int x;
for (x = startx; x < extent.stopx; x++)
{
if (ooz > 0)
{
/* compute Z and check the Z buffer value first */
float z = recip_approx(ooz);
int zbufval = (int)(z0 * z);
if (zbufval < zbuf[x])
{
int u = (int)(uoz * z);
int v = (int)(voz * z);
int pixeloffs = (tex + (v >> 8) * 4096 + (u >> 8)) & endmask;
if (pixeloffs >= m_texmask_size || !m_texmask[pixeloffs])
{
uint32_t rgb00 = palsource[m_texture[pixeloffs]];
uint32_t rgb01 = palsource[m_texture[(pixeloffs + 1) & endmask]];
uint32_t rgb10 = palsource[m_texture[(pixeloffs + 4096) & endmask]];
uint32_t rgb11 = palsource[m_texture[(pixeloffs + 4097) & endmask]];
const uint32_t filtered = rgbaint_t::bilinear_filter(rgb00, rgb01, rgb10, rgb11, u, v);
dest[x] = (filtered & 0x1f) | ((filtered & 0x1ff800) >> 6);
zbuf[x] = (zbufval < 0) ? -zbufval : zbufval;
}
}
}
/* advance texture params to the next pixel */
ooz += ooz_dx;
uoz += uoz_dx;
voz += voz_dx;
}
}
void gaelco3d_state::gaelco3d_renderer::render_alphablend(int32_t scanline, const extent_t &extent, const gaelco3d_object_data &object, int threadid)
{
float ooz_dx = object.ooz_dx;
float uoz_dx = object.uoz_dx;
float voz_dx = object.voz_dx;
offs_t endmask = m_texture_size - 1;
const rgb_t *palsource = m_state.m_palette.get() + object.color;
uint32_t tex = object.tex;
float z0 = object.z0;
uint16_t *dest = &m_screenbits.pix16(scanline);
uint16_t *zbuf = &m_zbuffer.pix16(scanline);
int startx = extent.startx;
float ooz = object.ooz_base + object.ooz_dy * scanline + startx * ooz_dx;
float uoz = object.uoz_base + object.uoz_dy * scanline + startx * uoz_dx;
float voz = object.voz_base + object.voz_dy * scanline + startx * voz_dx;
int x;
for (x = startx; x < extent.stopx; x++)
{
if (ooz > 0)
{
/* compute Z and check the Z buffer value first */
float z = recip_approx(ooz);
int zbufval = (int)(z0 * z);
if (zbufval < zbuf[x])
{
int u = (int)(uoz * z);
int v = (int)(voz * z);
int pixeloffs = (tex + (v >> 8) * 4096 + (u >> 8)) & endmask;
if (pixeloffs >= m_texmask_size || !m_texmask[pixeloffs])
{
uint32_t rgb00 = palsource[m_texture[pixeloffs]];
uint32_t rgb01 = palsource[m_texture[(pixeloffs + 1) & endmask]];
uint32_t rgb10 = palsource[m_texture[(pixeloffs + 4096) & endmask]];
uint32_t rgb11 = palsource[m_texture[(pixeloffs + 4097) & endmask]];
const uint32_t filtered = rgbaint_t::bilinear_filter(rgb00, rgb01, rgb10, rgb11, u, v) >> 1;
dest[x] = ((filtered & 0x0f) | ((filtered & 0x0f7800) >> 6)) + ((dest[x] >> 1) & 0x3def);
zbuf[x] = (zbufval < 0) ? -zbufval : zbufval;
}
}
}
/* advance texture params to the next pixel */
ooz += ooz_dx;
uoz += uoz_dx;
voz += voz_dx;
}
}
/*************************************
*
* Scene rendering
*
*************************************/
void gaelco3d_state::gaelco3d_render(screen_device &screen)
{
/* wait for any queued stuff to complete */
m_poly->wait("Time to render");
#if DISPLAY_STATS
{
int scan = screen.vpos();
popmessage("Polys = %4d Timeleft = %3d", m_poly->polygons(), (m_lastscan < scan) ? (scan - m_lastscan) : (scan + (m_lastscan - screen.visible_area().max_y)));
}
#endif
m_polydata_count = 0;
m_lastscan = -1;
}
/*************************************
*
* Renderer access
*
*************************************/
WRITE32_MEMBER(gaelco3d_state::gaelco3d_render_w)
{
/* append the data to our buffer */
m_polydata_buffer[m_polydata_count++] = data;
if (m_polydata_count >= MAX_POLYDATA)
fatalerror("Out of polygon buffer &space!\n");
/* if we've accumulated a completed poly set of data, queue it */
if (!machine().video().skip_this_frame())
{
if (m_polydata_count >= 18 && (m_polydata_count % 2) == 1 && IS_POLYEND(m_polydata_buffer[m_polydata_count - 2]))
{
m_poly->render_poly(*m_screen, &m_polydata_buffer[0]);
m_polydata_count = 0;
}
m_video_changed = true;
}
#if DISPLAY_STATS
m_lastscan = m_screen->vpos();
#endif
}
/*************************************
*
* Palette access
*
*************************************/
WRITE16_MEMBER(gaelco3d_state::gaelco3d_paletteram_w)
{
m_poly->wait("Palette change");
COMBINE_DATA(&m_paletteram16[offset]);
m_palette[offset] = ((m_paletteram16[offset] & 0x7fe0) << 6) | (m_paletteram16[offset] & 0x1f);
}
WRITE32_MEMBER(gaelco3d_state::gaelco3d_paletteram_020_w)
{
m_poly->wait("Palette change");
COMBINE_DATA(&m_paletteram32[offset]);
m_palette[offset*2+0] = ((m_paletteram32[offset] & 0x7fe00000) >> 10) | ((m_paletteram32[offset] & 0x1f0000) >> 16);
m_palette[offset*2+1] = ((m_paletteram32[offset] & 0x7fe0) << 6) | (m_paletteram32[offset] & 0x1f);
}
/*************************************
*
* Video update
*
*************************************/
uint32_t gaelco3d_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int ret;
/*
if (DISPLAY_TEXTURE && (machine().input().code_pressed(KEYCODE_Z) || machine().input().code_pressed(KEYCODE_X)))
{
static int xv = 0, yv = 0x1000;
uint8_t *base = m_texture;
int length = m_texture_size;
if (machine().input().code_pressed(KEYCODE_X))
{
base = m_texmask;
length = m_texmask_size;
}
if (machine().input().code_pressed(KEYCODE_LEFT) && xv >= 4)
xv -= 4;
if (machine().input().code_pressed(KEYCODE_RIGHT) && xv < 4096 - 4)
xv += 4;
if (machine().input().code_pressed(KEYCODE_UP) && yv >= 4)
yv -= 4;
if (machine().input().code_pressed(KEYCODE_DOWN) && yv < 0x40000)
yv += 4;
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
uint16_t *dest = &bitmap.pix16(y);
for (x = cliprect.min_x; x <= cliprect.max_x; x++)
{
int offs = (yv + y - cliprect.min_y) * 4096 + xv + x - cliprect.min_x;
if (offs < length)
dest[x] = base[offs];
else
dest[x] = 0;
}
}
popmessage("(%04X,%04X)", xv, yv);
}
else*/
{
if (m_video_changed)
copybitmap(bitmap, m_poly->screenbits(), 0,1, 0,0, cliprect);
ret = m_video_changed;
m_video_changed = false;
}
logerror("---update---\n");
return (!ret);
}