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annotate vdp.h @ 230:d3266cee02c9

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Implemented shadow hilight mode.
author Mike Pavone <pavone@retrodev.com>
date Mon, 22 Apr 2013 19:39:38 -0700
parents 7504200cac86
children e5e8b48ad157
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1 #ifndef VDP_H_
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2 #define VDP_H_
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3
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4 #include <stdint.h>
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5 #include <stdio.h>
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6
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7 #define VDP_REGS 24
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8 #define CRAM_SIZE 64
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9 #define VSRAM_SIZE 40
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10 #define VRAM_SIZE (64*1024)
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11 #define LINEBUF_SIZE 320
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12 #define FRAMEBUF_ENTRIES (320+27)*(240+27) //PAL active display + full border
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13 #define FRAMEBUF_SIZE (FRAMEBUF_ENTRIES*sizeof(uint16_t))
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14 #define MAX_DRAWS 40
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15 #define MAX_DRAWS_H32 32
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16 #define MAX_SPRITES_LINE 20
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17 #define MAX_SPRITES_LINE_H32 16
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18 #define MAX_SPRITES_FRAME 80
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19 #define MAX_SPRITES_FRAME_H32 64
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21 #define FBUF_SHADOW 0x0001
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22 #define FBUF_HILIGHT 0x0010
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23 #define FBUF_BIT_PRIORITY 0x1000
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24 #define FBUF_SRC_MASK 0xE000
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25 #define FBUF_SRC_A 0x0000
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26 #define FBUF_SRC_W 0x2000
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27 #define FBUF_SRC_B 0x4000
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28 #define FBUF_SRC_S 0x6000
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29 #define FBUF_SRC_BG 0x8000
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30
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31 #define MCLKS_LINE 3420
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32
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33 #define FLAG_DOT_OFLOW 0x1
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34 #define FLAG_CAN_MASK 0x2
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35 #define FLAG_MASKED 0x4
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36 #define FLAG_WINDOW 0x8
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37 #define FLAG_PENDING 0x10
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38 #define FLAG_UNUSED_SLOT 0x20
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39 #define FLAG_DMA_RUN 0x40
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40 #define FLAG_DMA_PROG 0x80
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41
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42 #define DISPLAY_ENABLE 0x40
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43
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44 enum {
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45 REG_MODE_1=0,
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46 REG_MODE_2,
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47 REG_SCROLL_A,
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48 REG_WINDOW,
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49 REG_SCROLL_B,
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50 REG_SAT,
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51 REG_BG_COLOR,
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52 REG_HINT=0xA,
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53 REG_MODE_3,
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54 REG_MODE_4,
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55 REG_HSCROLL,
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56 REG_AUTOINC=0xF,
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57 REG_SCROLL,
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58 REG_WINDOW_H,
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59 REG_WINDOW_V,
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60 REG_DMALEN_L,
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61 REG_DMALEN_H,
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62 REG_DMASRC_L,
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63 REG_DMASRC_M,
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64 REG_DMASRC_H
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65 } vdp_regs;
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66
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67 typedef struct {
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68 uint16_t address;
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69 int16_t x_pos;
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70 uint8_t pal_priority;
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71 uint8_t h_flip;
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72 } sprite_draw;
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74 typedef struct {
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75 uint8_t size;
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76 uint8_t index;
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77 int16_t y;
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78 } sprite_info;
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80 typedef struct {
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81 uint32_t cycle;
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82 uint16_t address;
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83 uint16_t value;
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84 uint8_t cd;
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85 uint8_t partial;
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86 } fifo_entry;
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87
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88 typedef struct {
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89 fifo_entry *fifo_cur;
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90 fifo_entry *fifo_end;
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91 uint16_t address;
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92 uint8_t cd;
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93 uint8_t flags;
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94 uint8_t regs[VDP_REGS];
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95 //cycle count in MCLKs
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96 uint32_t cycles;
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97 uint8_t *vdpmem;
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98 //stores 2-bit palette + 4-bit palette index + priority for current sprite line
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99 uint8_t *linebuf;
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100 //stores 12-bit color + shadow/highlight bits
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101 uint16_t *framebuf;
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102 uint16_t cram[CRAM_SIZE];
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103 uint16_t vsram[VSRAM_SIZE];
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104 uint8_t latched_mode;
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105 uint16_t hscroll_a;
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106 uint16_t hscroll_b;
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107 uint8_t sprite_index;
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108 uint8_t sprite_draws;
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109 int8_t slot_counter;
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110 int8_t cur_slot;
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111 sprite_draw sprite_draw_list[MAX_DRAWS];
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112 sprite_info sprite_info_list[MAX_SPRITES_LINE];
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113 uint16_t col_1;
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114 uint16_t col_2;
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115 uint16_t dma_val;
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116 uint8_t v_offset;
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117 uint8_t dma_cd;
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118 uint8_t *tmp_buf_a;
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119 uint8_t *tmp_buf_b;
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120 } vdp_context;
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121
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122 void init_vdp_context(vdp_context * context);
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123 void vdp_run_context(vdp_context * context, uint32_t target_cycles);
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124 //runs from current cycle count to VBLANK for the current mode, returns ending cycle count
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125 uint32_t vdp_run_to_vblank(vdp_context * context);
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126 //runs until the target cycle is reached or the current DMA operation has completed, whicever comes first
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127 void vdp_run_dma_done(vdp_context * context, uint32_t target_cycles);
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128 void vdp_load_savestate(vdp_context * context, FILE * state_file);
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129 void vdp_save_state(vdp_context * context, FILE * outfile);
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130 int vdp_control_port_write(vdp_context * context, uint16_t value);
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131 int vdp_data_port_write(vdp_context * context, uint16_t value);
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132 uint16_t vdp_control_port_read(vdp_context * context);
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133 uint16_t vdp_data_port_read(vdp_context * context);
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134 uint16_t vdp_hv_counter_read(vdp_context * context);
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135 void vdp_adjust_cycles(vdp_context * context, uint32_t deduction);
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136
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137 #endif //VDP_H_