summaryrefslogblamecommitdiffstatshomepage
path: root/src/mame/video/tp84.cpp
blob: 7851d147b7da885b13a69aa156fe043b21aa10f3 (plain) (tree)
1
2
3
4
5
6
7
8
9
10

                                







                                                                            
                
                         
                          
 
 
 
 
 






                                             


                                               




                                           
                                     










                                                                        
                                                            
 
                                                               
                                                                      
 

                                                    
                                              
                                                        

                                                   
 

                                                
         
                                           





                                                     
                                                                               





                                                     
                                                                               





                                                     
                                                                               
 
                                                              

         
                                                                     
                            
 

                                                                     
         
                                           
                 
                                                                                                          
                                                                                                        
                 



         
                                           
 
                                                             
                           
                                                   
                                   

 
 
                                         
 
                             
                                

 
 
                                                  
 




                                                                                         
 
                                                    

 
                                                  
 




                                                                                         
 
                                                    

 
 
                              
 

                                                                                                                                                                        

 
 
                                                                              
 
                 
                                                           
 
                                               
         

                                                    
 



                                                                          
 
                                                                                                  
                                                                                                     
 


         
 
                                                                                                               
 
                                  
                                                         
 
                                                          
         
                                                     
 

                                                          
 

                                                                                                                      
         
 
                                                           
                                       
 
                                    

                                        
                                                       
 
                                       

                                        
                                                       
 
                 
 
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************

    video.c

    Functions to emulate the video hardware of the machine.

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

#include "emu.h"
#include "video/resnet.h"
#include "includes/tp84.h"





/*
-The colortable is divided in 2 part:
 -The characters colors
 -The sprites colors

-The characters colors are indexed like this:
 -2 bits from the characters
 -4 bits from the attribute in tp84_bg_colorram
 -2 bits from palette_bank (d3-d4)
 -3 bits from palette_bank (d0-d1-d2)
-So, there is 2048 bytes for the characters

-The sprites colors are indexed like this:
 -4 bits from the sprites (16 colors)
 -4 bits from the attribute of the sprites
 -3 bits from palette_bank (d0-d1-d2)
-So, there is 2048 bytes for the sprites

*/
/*
     The RGB signals are generated by 3 proms 256X4 (prom 2C, 2D and 1E)
        The resistors values are:
            1K  ohm
            470 ohm
            220 ohm
            100 ohm
*/
void tp84_state::tp84_palette(palette_device &palette) const
{
	const uint8_t *color_prom = memregion("proms")->base();
	static constexpr int resistances[4] = { 1000, 470, 220, 100 };

	// compute the color output resistor weights
	double weights[4];
	compute_resistor_weights(0, 255, -1.0,
			4, resistances, weights, 470, 0,
			0, nullptr, nullptr, 0, 0,
			0, nullptr, nullptr, 0, 0);

	// create a lookup table for the palette
	for (int i = 0; i < 0x100; i++)
	{
		int bit0, bit1, bit2, bit3;

		// red component
		bit0 = BIT(color_prom[i | 0x000], 0);
		bit1 = BIT(color_prom[i | 0x000], 1);
		bit2 = BIT(color_prom[i | 0x000], 2);
		bit3 = BIT(color_prom[i | 0x000], 3);
		int const r = combine_weights(weights, bit0, bit1, bit2, bit3);

		// green component
		bit0 = BIT(color_prom[i | 0x100], 0);
		bit1 = BIT(color_prom[i | 0x100], 1);
		bit2 = BIT(color_prom[i | 0x100], 2);
		bit3 = BIT(color_prom[i | 0x100], 3);
		int const g = combine_weights(weights, bit0, bit1, bit2, bit3);

		// blue component
		bit0 = BIT(color_prom[i | 0x200], 0);
		bit1 = BIT(color_prom[i | 0x200], 1);
		bit2 = BIT(color_prom[i | 0x200], 2);
		bit3 = BIT(color_prom[i | 0x200], 3);
		int const b = combine_weights(weights, bit0, bit1, bit2, bit3);

		palette.set_indirect_color(i, rgb_t(r, g, b));
	}

	// color_prom now points to the beginning of the lookup table
	color_prom += 0x300;

	// characters use colors 0x80-0xff, sprites use colors 0-0x7f
	for (int i = 0; i < 0x200; i++)
	{
		for (int j = 0; j < 8; j++)
		{
			uint8_t const ctabentry = ((~i & 0x100) >> 1) | (j << 4) | (color_prom[i] & 0x0f);
			palette.set_pen_indirect(((i & 0x100) << 3) | (j << 8) | (i & 0xff), ctabentry);
		}
	}
}


WRITE8_MEMBER(tp84_state::tp84_spriteram_w)
{
	/* the game multiplexes the sprites, so update now */
//  m_screen->update_now();
	m_screen->update_partial(m_screen->vpos());
	m_spriteram[offset] = data;
}


READ8_MEMBER(tp84_state::tp84_scanline_r)
{
	/* reads 1V - 128V */
	return m_screen->vpos();
}


TILE_GET_INFO_MEMBER(tp84_state::get_bg_tile_info)
{
	int code = ((m_bg_colorram[tile_index] & 0x30) << 4) | m_bg_videoram[tile_index];
	int color = ((*m_palette_bank & 0x07) << 6) |
				((*m_palette_bank & 0x18) << 1) |
				(m_bg_colorram[tile_index] & 0x0f);
	int flags = TILE_FLIPYX(m_bg_colorram[tile_index] >> 6);

	SET_TILE_INFO_MEMBER(0, code, color, flags);
}

TILE_GET_INFO_MEMBER(tp84_state::get_fg_tile_info)
{
	int code = ((m_fg_colorram[tile_index] & 0x30) << 4) | m_fg_videoram[tile_index];
	int color = ((*m_palette_bank & 0x07) << 6) |
				((*m_palette_bank & 0x18) << 1) |
				(m_fg_colorram[tile_index] & 0x0f);
	int flags = TILE_FLIPYX(m_fg_colorram[tile_index] >> 6);

	SET_TILE_INFO_MEMBER(0, code, color, flags);
}


void tp84_state::video_start()
{
	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(tp84_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
	m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(tp84_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
}


void tp84_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	int offs;
	int palette_base = ((*m_palette_bank & 0x07) << 4);

	for (offs = 0x5c; offs >= 0; offs -= 4)
	{
		int x = m_spriteram[offs];
		int y = 240 - m_spriteram[offs + 3];

		int code = m_spriteram[offs + 1];
		int color = palette_base | (m_spriteram[offs + 2] & 0x0f);
		int flip_x = ~m_spriteram[offs + 2] & 0x40;
		int flip_y =  m_spriteram[offs + 2] & 0x80;

		m_gfxdecode->gfx(1)->transmask(bitmap,cliprect, code, color, flip_x, flip_y, x, y,
				m_palette->transpen_mask(*m_gfxdecode->gfx(1), color, palette_base));

	}
}


uint32_t tp84_state::screen_update_tp84(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	rectangle clip = cliprect;
	const rectangle &visarea = screen.visible_area();

	if (cliprect.min_y == screen.visible_area().min_y)
	{
		machine().tilemap().mark_all_dirty();

		m_bg_tilemap->set_scrollx(0, *m_scroll_x);
		m_bg_tilemap->set_scrolly(0, *m_scroll_y);

		machine().tilemap().set_flip_all((m_flipscreen_x ? TILEMAP_FLIPX : 0) |
										(m_flipscreen_y ? TILEMAP_FLIPY : 0));
	}

	m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
	draw_sprites(bitmap, cliprect);

	/* draw top status region */
	clip.min_x = visarea.min_x;
	clip.max_x = visarea.min_x + 15;
	m_fg_tilemap->draw(screen, bitmap, clip, 0, 0);

	/* draw bottom status region */
	clip.min_x = visarea.max_x - 15;
	clip.max_x = visarea.max_x;
	m_fg_tilemap->draw(screen, bitmap, clip, 0, 0);

	return 0;
}