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Diffstat (limited to 'docs/release/src/devices/video/vector.cpp')
-rw-r--r-- | docs/release/src/devices/video/vector.cpp | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/docs/release/src/devices/video/vector.cpp b/docs/release/src/devices/video/vector.cpp new file mode 100644 index 00000000000..fcb7baf0c51 --- /dev/null +++ b/docs/release/src/devices/video/vector.cpp @@ -0,0 +1,200 @@ +// license:BSD-3-Clause +// copyright-holders:Brad Oliver,Aaron Giles,Bernd Wiebelt,Allard van der Bas +/****************************************************************************** + * + * vector.c + * + * anti-alias code by Andrew Caldwell + * (still more to add) + * + * 040227 Fixed miny clip scaling which was breaking in mhavoc. AREK + * 010903 added support for direct RGB modes MLR + * 980611 use translucent vectors. Thanks to Peter Hirschberg + * and Neil Bradley for the inspiration. BW + * 980307 added cleverer dirty handling. BW, ASG + * fixed antialias table .ac + * 980221 rewrote anti-alias line draw routine + * added inline assembly multiply fuction for 8086 based machines + * beam diameter added to draw routine + * beam diameter is accurate in anti-alias line draw (Tcosin) + * flicker added .ac + * 980203 moved LBO's routines for drawing into a buffer of vertices + * from avgdvg.c to this location. Scaling is now initialized + * by calling vector_init(...). BW + * 980202 moved out of msdos.c ASG + * 980124 added anti-alias line draw routine + * modified avgdvg.c and sega.c to support new line draw routine + * added two new tables Tinten and Tmerge (for 256 color support) + * added find_color routine to build above tables .ac + * + * Vector Team + * + * Brad Oliver + * Aaron Giles + * Bernd Wiebelt + * Allard van der Bas + * Al Kossow (VECSIM) + * Hedley Rainnie (VECSIM) + * Eric Smith (VECSIM) + * Neil Bradley (technical advice) + * Andrew Caldwell (anti-aliasing) + * + **************************************************************************** */ + +#include "emu.h" +#include "emuopts.h" +#include "rendutil.h" +#include "vector.h" + + +#define VECTOR_WIDTH_DENOM 512 +// mhavocpe +#define MAX_POINTS 20000 + +float vector_options::s_flicker = 0.0f; +float vector_options::s_beam_width_min = 0.0f; +float vector_options::s_beam_width_max = 0.0f; +float vector_options::s_beam_intensity_weight = 0.0f; + +void vector_options::init(emu_options& options) +{ + s_beam_width_min = options.beam_width_min(); + s_beam_width_max = options.beam_width_max(); + s_beam_intensity_weight = options.beam_intensity_weight(); + s_flicker = options.flicker(); +} + +// device type definition +DEFINE_DEVICE_TYPE(VECTOR, vector_device, "vector_device", "VECTOR") + +vector_device::vector_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, VECTOR, tag, owner, clock), + device_video_interface(mconfig, *this), + m_vector_list(nullptr), + m_min_intensity(255), + m_max_intensity(0) +{ +} + +void vector_device::device_start() +{ + vector_options::init(machine().options()); + + m_vector_index = 0; + + /* allocate memory for tables */ + m_vector_list = make_unique_clear<point[]>(MAX_POINTS); +} + +/* + * www.dinodini.wordpress.com/2010/04/05/normalized-tunable-sigmoid-functions/ + */ +float vector_device::normalized_sigmoid(float n, float k) +{ + // valid for n and k in range of -1.0 and 1.0 + return (n - n * k) / (k - fabs(n) * 2.0f * k + 1.0f); +} + + +/* + * Adds a line end point to the vertices list. The vector processor emulation + * needs to call this. + */ +void vector_device::add_point(int x, int y, rgb_t color, int intensity) +{ + point *newpoint; + + intensity = std::max(0, std::min(255, intensity)); + + m_min_intensity = intensity > 0 ? std::min(m_min_intensity, intensity) : m_min_intensity; + m_max_intensity = intensity > 0 ? std::max(m_max_intensity, intensity) : m_max_intensity; + + if (vector_options::s_flicker && (intensity > 0)) + { + float random = (float)(machine().rand() & 255) / 255.0f; // random value between 0.0 and 1.0 + + intensity -= (int)(intensity * random * vector_options::s_flicker); + + intensity = std::max(0, std::min(255, intensity)); + } + + newpoint = &m_vector_list[m_vector_index]; + newpoint->x = x; + newpoint->y = y; + newpoint->col = color; + newpoint->intensity = intensity; + + m_vector_index++; + if (m_vector_index >= MAX_POINTS) + { + m_vector_index--; + logerror("*** Warning! Vector list overflow!\n"); + } +} + + +/* + * The vector CPU creates a new display list. We save the old display list, + * but only once per refresh. + */ +void vector_device::clear_list(void) +{ + m_vector_index = 0; +} + + +uint32_t vector_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) +{ + uint32_t flags = PRIMFLAG_ANTIALIAS(1) | PRIMFLAG_BLENDMODE(BLENDMODE_ADD) | PRIMFLAG_VECTOR(1); + const rectangle &visarea = screen.visible_area(); + float xscale = 1.0f / (65536 * visarea.width()); + float yscale = 1.0f / (65536 * visarea.height()); + float xoffs = (float)visarea.min_x; + float yoffs = (float)visarea.min_y; + + point *curpoint; + int lastx = 0; + int lasty = 0; + + curpoint = m_vector_list.get(); + + screen.container().empty(); + screen.container().add_rect(0.0f, 0.0f, 1.0f, 1.0f, rgb_t(0xff,0x00,0x00,0x00), PRIMFLAG_BLENDMODE(BLENDMODE_ALPHA) | PRIMFLAG_VECTORBUF(1)); + + for (int i = 0; i < m_vector_index; i++) + { + render_bounds coords; + + float intensity = (float)curpoint->intensity / 255.0f; + float intensity_weight = normalized_sigmoid(intensity, vector_options::s_beam_intensity_weight); + + // check for static intensity + float beam_width = m_min_intensity == m_max_intensity + ? vector_options::s_beam_width_min + : vector_options::s_beam_width_min + intensity_weight * (vector_options::s_beam_width_max - vector_options::s_beam_width_min); + + // normalize width + beam_width *= 1.0f / (float)VECTOR_WIDTH_DENOM; + + coords.x0 = ((float)lastx - xoffs) * xscale; + coords.y0 = ((float)lasty - yoffs) * yscale; + coords.x1 = ((float)curpoint->x - xoffs) * xscale; + coords.y1 = ((float)curpoint->y - yoffs) * yscale; + + if (curpoint->intensity != 0) + { + screen.container().add_line( + coords.x0, coords.y0, coords.x1, coords.y1, + beam_width, + (curpoint->intensity << 24) | (curpoint->col & 0xffffff), + flags); + } + + lastx = curpoint->x; + lasty = curpoint->y; + + curpoint++; + } + + return 0; +} |