summaryrefslogblamecommitdiffstatshomepage
path: root/src/mame/video/hyperspt.c
blob: 53ad27eaaca7291e4a8d3607f140b1c516cee4d9 (plain) (tree)
1
2
3
4
5
6
7
8
9







                                                                            
                
                         
                              


















                                                                            
 

                        
                                                                
                                                         
                                                     
              
 




                                                                  
 
                                     
                                                             


                                                   
         

                                     

                                   




                                                                  
                                     




                                                                  
                                    


                                                            
 
                                                                                       


                                                                        
                           

                     


                                                       
                                                                             
         

                        


                                                                
                                                                             
         



                                     
                                                                               

                                                             



                                     
                                                                               

                                                             



                                       
                                                               
         

                                                                   




                                        
                                                                      


                                                                                                                                                 
 
                                             



                       
                                                                      
 

                                                                                                         

 
                                                                                                 
 
                                                                      
                                              

                 
                                                                    


                                                   

                                                                              


                                                    
                                             




                                       
                                                                                                          



                                                                       
                                                  
                                       
                                    

                                     
                                                                                                    


                                            
                                                  
                                       
                                    

                                     
                                                                                                    


         
                         
 
                                                                                



                                      
                                                                                                       
                                                                           
                                                                       

         
                                                                  
                                                          



                  

                                              
                                                                      


                                                                                                                                                 
 
                                             



                    
                                                                      
 

                                                                                                               
 
/***************************************************************************

  video.c

  Functions to emulate the video hardware of the machine.

***************************************************************************/

#include "emu.h"
#include "video/resnet.h"
#include "includes/hyperspt.h"

/***************************************************************************

  Convert the color PROMs into a more useable format.

  Hyper Sports has one 32x8 palette PROM and two 256x4 lookup table PROMs
  (one for characters, one for sprites).
  The palette PROM is connected to the RGB output this way:

  bit 7 -- 220 ohm resistor  -- BLUE
        -- 470 ohm resistor  -- BLUE
        -- 220 ohm resistor  -- GREEN
        -- 470 ohm resistor  -- GREEN
        -- 1  kohm resistor  -- GREEN
        -- 220 ohm resistor  -- RED
        -- 470 ohm resistor  -- RED
  bit 0 -- 1  kohm resistor  -- RED

***************************************************************************/

PALETTE_INIT( hyperspt )
{
	static const int resistances_rg[3] = { 1000, 470, 220 };
	static const int resistances_b[2] = { 470, 220 };
	double rweights[3], gweights[3], bweights[2];
	int i;

	/* compute the color output resistor weights */
	compute_resistor_weights(0,	255, -1.0,
			3, &resistances_rg[0], rweights, 1000, 0,
			3, &resistances_rg[0], gweights, 1000, 0,
			2, &resistances_b[0],  bweights, 1000, 0);

	/* allocate the colortable */
	machine.colortable = colortable_alloc(machine, 0x20);

	/* create a lookup table for the palette */
	for (i = 0; i < 0x20; i++)
	{
		int bit0, bit1, bit2;
		int r, g, b;

		/* red component */
		bit0 = (color_prom[i] >> 0) & 0x01;
		bit1 = (color_prom[i] >> 1) & 0x01;
		bit2 = (color_prom[i] >> 2) & 0x01;
		r = combine_3_weights(rweights, bit0, bit1, bit2);

		/* green component */
		bit0 = (color_prom[i] >> 3) & 0x01;
		bit1 = (color_prom[i] >> 4) & 0x01;
		bit2 = (color_prom[i] >> 5) & 0x01;
		g = combine_3_weights(gweights, bit0, bit1, bit2);

		/* blue component */
		bit0 = (color_prom[i] >> 6) & 0x01;
		bit1 = (color_prom[i] >> 7) & 0x01;
		b = combine_2_weights(bweights, bit0, bit1);

		colortable_palette_set_color(machine.colortable, i, MAKE_RGB(r, g, b));
	}

	/* color_prom now points to the beginning of the lookup table */
	color_prom += 0x20;

	/* sprites */
	for (i = 0; i < 0x100; i++)
	{
		UINT8 ctabentry = color_prom[i] & 0x0f;
		colortable_entry_set_value(machine.colortable, i, ctabentry);
	}

	/* characters */
	for (i = 0x100; i < 0x200; i++)
	{
		UINT8 ctabentry = (color_prom[i] & 0x0f) | 0x10;
		colortable_entry_set_value(machine.colortable, i, ctabentry);
	}
}

WRITE8_HANDLER( hyperspt_videoram_w )
{
	hyperspt_state *state = space->machine().driver_data<hyperspt_state>();
	state->m_videoram[offset] = data;
	tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}

WRITE8_HANDLER( hyperspt_colorram_w )
{
	hyperspt_state *state = space->machine().driver_data<hyperspt_state>();
	state->m_colorram[offset] = data;
	tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}

WRITE8_HANDLER( hyperspt_flipscreen_w )
{
	if (flip_screen_get(space->machine()) != (data & 0x01))
	{
		flip_screen_set(space->machine(), data & 0x01);
		tilemap_mark_all_tiles_dirty_all(space->machine());
	}
}

static TILE_GET_INFO( get_bg_tile_info )
{
	hyperspt_state *state = machine.driver_data<hyperspt_state>();
	int code = state->m_videoram[tile_index] + ((state->m_colorram[tile_index] & 0x80) << 1) + ((state->m_colorram[tile_index] & 0x40) << 3);
	int color = state->m_colorram[tile_index] & 0x0f;
	int flags = ((state->m_colorram[tile_index] & 0x10) ? TILE_FLIPX : 0) | ((state->m_colorram[tile_index] & 0x20) ? TILE_FLIPY : 0);

	SET_TILE_INFO(1, code, color, flags);
}

VIDEO_START( hyperspt )
{
	hyperspt_state *state = machine.driver_data<hyperspt_state>();

	state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 64, 32);
	tilemap_set_scroll_rows(state->m_bg_tilemap, 32);
}

static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
	hyperspt_state *state = machine.driver_data<hyperspt_state>();
	UINT8 *spriteram = state->m_spriteram;
	int offs;

	for (offs = state->m_spriteram_size - 4;offs >= 0;offs -= 4)
	{
		int sx = spriteram[offs + 3];
		int sy = 240 - spriteram[offs + 1];
		int code = spriteram[offs + 2] + 8 * (spriteram[offs] & 0x20);
		int color = spriteram[offs] & 0x0f;
		int flipx = ~spriteram[offs] & 0x40;
		int flipy = spriteram[offs] & 0x80;

		if (flip_screen_get(machine))
		{
			sy = 240 - sy;
			flipy = !flipy;
		}

		/* Note that this adjustment must be done AFTER handling flip_screen_get(machine), thus */
		/* proving that this is a hardware related "feature" */

		sy += 1;

		drawgfx_transmask(bitmap,cliprect,
			machine.gfx[0],
			code, color,
			flipx, flipy,
			sx, sy,
			colortable_get_transpen_mask(machine.colortable, machine.gfx[0], color, 0));

		/* redraw with wraparound */

		drawgfx_transmask(bitmap,cliprect,
			machine.gfx[0],
			code, color,
			flipx, flipy,
			sx - 256, sy,
			colortable_get_transpen_mask(machine.colortable, machine.gfx[0], color, 0));
	}
}

SCREEN_UPDATE( hyperspt )
{
	hyperspt_state *state = screen->machine().driver_data<hyperspt_state>();
	int row;

	for (row = 0; row < 32; row++)
	{
		int scrollx = state->m_scroll[row * 2] + (state->m_scroll[(row * 2) + 1] & 0x01) * 256;
		if (flip_screen_get(screen->machine())) scrollx = -scrollx;
		tilemap_set_scrollx(state->m_bg_tilemap, row, scrollx);
	}

	tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
	draw_sprites(screen->machine(), bitmap, cliprect);
	return 0;
}

/* Road Fighter */
static TILE_GET_INFO( roadf_get_bg_tile_info )
{
	hyperspt_state *state = machine.driver_data<hyperspt_state>();
	int code = state->m_videoram[tile_index] + ((state->m_colorram[tile_index] & 0x80) << 1) + ((state->m_colorram[tile_index] & 0x60) << 4);
	int color = state->m_colorram[tile_index] & 0x0f;
	int flags = (state->m_colorram[tile_index] & 0x10) ? TILE_FLIPX : 0;

	SET_TILE_INFO(1, code, color, flags);
}

VIDEO_START( roadf )
{
	hyperspt_state *state = machine.driver_data<hyperspt_state>();

	state->m_bg_tilemap = tilemap_create(machine, roadf_get_bg_tile_info, tilemap_scan_rows, 8, 8, 64, 32);
	tilemap_set_scroll_rows(state->m_bg_tilemap, 32);
}