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comparison vdp.h @ 471:f065769836e8

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Implement FIFO as a ring buffer so the behavior of reads from invalid CRAM and VSRAM bits can be implemented properly
author Mike Pavone <pavone@retrodev.com>
date Sun, 15 Sep 2013 22:20:43 -0700
parents 541c1ae8abf3
children 2e4a4188cfb0
comparison
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470:541c1ae8abf3 471:f065769836e8
108 uint8_t size; 108 uint8_t size;
109 uint8_t index; 109 uint8_t index;
110 int16_t y; 110 int16_t y;
111 } sprite_info; 111 } sprite_info;
112 112
113 #define FIFO_SIZE 4
114
113 typedef struct { 115 typedef struct {
114 uint32_t cycle; 116 uint32_t cycle;
115 uint16_t address; 117 uint16_t address;
116 uint16_t value; 118 uint16_t value;
117 uint8_t cd; 119 uint8_t cd;
118 uint8_t partial; 120 uint8_t partial;
119 } fifo_entry; 121 } fifo_entry;
120 122
121 typedef struct { 123 typedef struct {
122 fifo_entry *fifo_cur; 124 fifo_entry fifo[FIFO_SIZE];
123 fifo_entry *fifo_end; 125 int32_t fifo_write;
126 int32_t fifo_read;
124 uint16_t address; 127 uint16_t address;
125 uint8_t cd; 128 uint8_t cd;
126 uint8_t flags; 129 uint8_t flags;
127 uint8_t regs[VDP_REGS]; 130 uint8_t regs[VDP_REGS];
128 //cycle count in MCLKs 131 //cycle count in MCLKs