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+// 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;
+}