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-rw-r--r--src/emu/video/vector.cpp373
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diff --git a/src/emu/video/vector.cpp b/src/emu/video/vector.cpp
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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
+ *
+ **************************************************************************** */
+
+#include "emu.h"
+#include "emuopts.h"
+#include "rendutil.h"
+#include "vector.h"
+
+
+#define FLT_EPSILON 1E-5
+
+#define VECTOR_WIDTH_DENOM 512
+
+#define MAX_POINTS 10000
+
+#define VECTOR_TEAM \
+ "-* Vector Heads *-\n" \
+ "Brad Oliver\n" \
+ "Aaron Giles\n" \
+ "Bernd Wiebelt\n" \
+ "Allard van der Bas\n" \
+ "Al Kossow (VECSIM)\n" \
+ "Hedley Rainnie (VECSIM)\n" \
+ "Eric Smith (VECSIM)\n" \
+ "Neil Bradley (technical advice)\n" \
+ "Andrew Caldwell (anti-aliasing)\n" \
+ "- *** -\n"
+
+#if 0
+
+#define TEXTURE_LENGTH_BUCKETS 32
+#define TEXTURE_INTENSITY_BUCKETS 4
+#define TEXTURE_WIDTH 16
+
+#define MAX_INTENSITY 2
+#define VECTOR_BLEED (0.25f)
+#define VECTOR_INT_SCALE (255.0f * 1.5f)
+
+
+struct vector_texture
+{
+ render_texture * texture;
+ bitmap_argb32 * bitmap;
+};
+
+static vector_texture *vectortex[TEXTURE_INTENSITY_BUCKETS][TEXTURE_LENGTH_BUCKETS];
+
+
+static render_texture *get_vector_texture(float dx, float dy, float intensity)
+{
+ float length = sqrt(dx * dx + dy * dy);
+ int lbucket = length * (float)TEXTURE_LENGTH_BUCKETS;
+ int ibucket = (intensity / (float)MAX_INTENSITY) * (float)TEXTURE_INTENSITY_BUCKETS;
+ vector_texture *tex;
+ int height, x, y;
+ float totalint;
+
+ if (lbucket > TEXTURE_LENGTH_BUCKETS)
+ lbucket = TEXTURE_LENGTH_BUCKETS;
+ if (ibucket > TEXTURE_INTENSITY_BUCKETS)
+ ibucket = TEXTURE_INTENSITY_BUCKETS;
+
+ tex = &vectortex[ibucket][lbucket];
+ if (tex->texture != NULL)
+ return tex->texture;
+
+ height = lbucket * VECTOR_WIDTH_DENOM / TEXTURE_LENGTH_BUCKETS;
+ tex->bitmap = global_alloc(bitmap_argb32(TEXTURE_WIDTH, height));
+ tex->bitmap.fill(rgb_t(0xff,0xff,0xff,0xff));
+
+ totalint = 1.0f;
+ for (x = TEXTURE_WIDTH / 2 - 1; x >= 0; x--)
+ {
+ int intensity = (int)(totalint * (1.0f - VECTOR_BLEED) * VECTOR_INT_SCALE);
+ intensity = MIN(255, intensity);
+ totalint -= (float)intensity * (1.0f / VECTOR_INT_SCALE);
+
+ for (y = 0; y < height; y++)
+ {
+ UINT32 *pix;
+
+ pix = (UINT32 *)bitmap.base + y * bitmap.rowpixels + x;
+ *pix = rgb_t((*pix.a() * intensity) >> 8,0xff,0xff,0xff);
+
+ pix = (UINT32 *)bitmap.base + y * bitmap.rowpixels + (TEXTURE_WIDTH - 1 - x);
+ *pix = rgb_t((*pix.a() * intensity) >> 8,0xff,0xff,0xff);
+ }
+ }
+
+ tex->texture = render_texture_create();
+ return tex->texture;
+}
+
+#endif
+
+#define VCLEAN 0
+#define VDIRTY 1
+#define VCLIP 2
+
+// device type definition
+const device_type VECTOR = &device_creator<vector_device>;
+
+vector_device::vector_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source)
+ : device_t(mconfig, type, name, tag, owner, clock, shortname, source),
+ device_video_interface(mconfig, *this)
+{
+}
+
+vector_device::vector_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, VECTOR, "VECTOR", tag, owner, clock, "vector_device", __FILE__),
+ device_video_interface(mconfig, *this)
+{
+}
+
+float vector_device::m_flicker = 0.0f;
+float vector_device::m_beam_width_min = 0.0f;
+float vector_device::m_beam_width_max = 0.0f;
+float vector_device::m_beam_intensity_weight = 0.0f;
+int vector_device::m_vector_index;
+
+void vector_device::device_start()
+{
+ /* Grab the settings for this session */
+ m_beam_width_min = machine().options().beam_width_min();
+ m_beam_width_max = machine().options().beam_width_max();
+ m_beam_intensity_weight = machine().options().beam_intensity_weight();
+ m_flicker = machine().options().flicker();
+
+ m_vector_index = 0;
+
+ /* allocate memory for tables */
+ m_vector_list = auto_alloc_array_clear(machine(), point, MAX_POINTS);
+}
+
+void vector_device::set_flicker(float newval)
+{
+ m_flicker = newval;
+}
+
+float vector_device::get_flicker()
+{
+ return m_flicker;
+}
+
+void vector_device::set_beam_width_min(float newval)
+{
+ m_beam_width_min = newval;
+}
+
+float vector_device::get_beam_width_min()
+{
+ return m_beam_width_min;
+}
+
+void vector_device::set_beam_width_max(float newval)
+{
+ m_beam_width_max = newval;
+}
+
+float vector_device::get_beam_width_max()
+{
+ return m_beam_width_max;
+}
+
+void vector_device::set_beam_intensity_weight(float newval)
+{
+ m_beam_intensity_weight = newval;
+}
+
+float vector_device::get_beam_intensity_weight()
+{
+ return m_beam_intensity_weight;
+}
+
+
+/*
+ * 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;
+
+ if (intensity > 255)
+ {
+ intensity = 255;
+ }
+
+ if (m_flicker && (intensity > 0))
+ {
+ float random = (float)(machine().rand() & 255) / 255.0f; // random value between 0.0 and 1.0
+
+ intensity -= (int)(intensity * random * m_flicker);
+ if (intensity < 0)
+ {
+ intensity = 0;
+ }
+ if (intensity > 255)
+ {
+ intensity = 255;
+ }
+ }
+
+ newpoint = &m_vector_list[m_vector_index];
+ newpoint->x = x;
+ newpoint->y = y;
+ newpoint->col = color;
+ newpoint->intensity = intensity;
+ newpoint->status = VDIRTY; /* mark identical lines as clean later */
+
+ m_vector_index++;
+ if (m_vector_index >= MAX_POINTS)
+ {
+ m_vector_index--;
+ logerror("*** Warning! Vector list overflow!\n");
+ }
+}
+
+
+/*
+ * Add new clipping info to the list
+ */
+void vector_device::add_clip(int x1, int yy1, int x2, int y2)
+{
+ point *newpoint;
+
+ newpoint = &m_vector_list[m_vector_index];
+ newpoint->x = x1;
+ newpoint->y = yy1;
+ newpoint->arg1 = x2;
+ newpoint->arg2 = y2;
+ newpoint->status = VCLIP;
+
+ 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 vector_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+ UINT32 flags = PRIMFLAG_ANTIALIAS(screen.machine().options().antialias() ? 1 : 0) | 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;
+ float xratio = xscale / yscale;
+ float yratio = yscale / xscale;
+ xratio = (xratio < 1.0f) ? xratio : 1.0f;
+ xratio = (yratio < 1.0f) ? yratio : 1.0f;
+
+ point *curpoint;
+ render_bounds clip;
+ int lastx = 0;
+ int lasty = 0;
+
+ curpoint = m_vector_list;
+
+ 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));
+
+ clip.x0 = clip.y0 = 0.0f;
+ clip.x1 = clip.y1 = 1.0f;
+
+ for (int i = 0; i < m_vector_index; i++)
+ {
+ render_bounds coords;
+
+ if (curpoint->status == VCLIP)
+ {
+ coords.x0 = ((float)curpoint->x - xoffs) * xscale;
+ coords.y0 = ((float)curpoint->y - yoffs) * yscale;
+ coords.x1 = ((float)curpoint->arg1 - xoffs) * xscale;
+ coords.y1 = ((float)curpoint->arg2 - yoffs) * yscale;
+
+ clip.x0 = (coords.x0 > 0.0f) ? coords.x0 : 0.0f;
+ clip.y0 = (coords.y0 > 0.0f) ? coords.y0 : 0.0f;
+ clip.x1 = (coords.x1 < 1.0f) ? coords.x1 : 1.0f;
+ clip.y1 = (coords.y1 < 1.0f) ? coords.y1 : 1.0f;
+ }
+ else
+ {
+ float intensity = (float)curpoint->intensity / 255.0f;
+ float intensity_weight = normalized_sigmoid(intensity, m_beam_intensity_weight);
+
+ float beam_intensity_width = (m_beam_width_max - m_beam_width_min) * intensity_weight + m_beam_width_min;
+ float beam_width = beam_intensity_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;
+
+ // extend zero-length vector line (vector point) by quarter beam_width on both sides
+ if (fabs(coords.x0 - coords.x1) < FLT_EPSILON &&
+ fabs(coords.y0 - coords.y1) < FLT_EPSILON)
+ {
+ coords.x0 += xratio * beam_width * 0.25f;
+ coords.y0 += yratio * beam_width * 0.25f;
+ coords.x1 -= xratio * beam_width * 0.25f;
+ coords.y1 -= yratio * beam_width * 0.25f;
+ }
+
+ if (curpoint->intensity != 0 && !render_clip_line(&coords, &clip))
+ {
+ 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;
+}