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#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include "jag_video.h"
enum {
VMODE_CRY,
VMODE_RGB24,
VMODE_DIRECT16,
VMODE_RGB16,
VMODE_VARIABLE
};
char *vmode_names[] = {
"CRY",
"RGB16",
"DIRECT16",
"VARIABLE"
};
jag_video *jag_video_init(void)
{
return calloc(1, sizeof(jag_video));
}
void jag_video_run(jag_video *context, uint32_t target_cycle)
{
context->cycles = target_cycle;
}
static uint8_t is_reg_writeable(uint32_t address)
{
return address < VID_HLPEN || address >= VID_OBJLIST1;
}
void jag_video_reg_write(jag_video *context, uint32_t address, uint16_t value)
{
uint32_t reg = (address >> 1 & 0x7F) - 2;
if (reg < JAG_VIDEO_REGS && is_reg_writeable(reg)) {
context->regs[reg] = value;
if (reg == VID_VMODE) {
context->pclock_div = (value >> 9 & 7) + 1;
context->pclock_counter = 0;
if (value & 0x10) {
context->mode = VMODE_VARIABLE;
} else {
context->mode = value >> 1 & 3;
}
printf("Mode %s, pixel clock divider: %d, time base generation: %s\n", vmode_names[context->mode], context->pclock_div, value & 1 ? "enabled" : "disabled");
}
switch (reg)
{
case VID_OBJLIST1:
printf("Object List Pointer 1: %X\n", value);
break;
case VID_OBJLIST2:
printf("Object List Pointer 2: %X\n", value);
break;
case VID_HPERIOD:
printf("Horizontal period: %d\n", value & 0x3FF);
break;
case VID_HBLANK_BEGIN:
printf("horizontal blanking begin: %d\n", value & 0x7FF);
break;
case VID_HBLANK_END:
printf("horizontal blanking end: %d\n", value & 0x7FF);
break;
case VID_HSYNC:
printf("horizontal sync start: %d\n", value & 0x7FF);
break;
case VID_HDISP_BEGIN1:
printf("horizontal display begin 1: %d\n", value & 0x7FF);
break;
case VID_HDISP_BEGIN2:
printf("horizontal display begin 2: %d\n", value & 0x7FF);
break;
case VID_HDISP_END:
printf("horizontal display end: %d\n", value & 0x7FF);
break;
case VID_VPERIOD:
printf("Vertical period: %d\n", value & 0x7FF);
break;
case VID_VBLANK_BEGIN:
printf("vertical blanking begin: %d\n", value & 0x7FF);
break;
case VID_VBLANK_END:
printf("vertical blanking end: %d\n", value & 0x7FF);
break;
case VID_VSYNC:
printf("vertical sync start: %d\n", value & 0x7FF);
break;
case VID_VDISP_BEGIN:
printf("vertical display begin: %d\n", value & 0x7FF);
break;
case VID_VDISP_END:
printf("vertical display end: %d\n", value & 0x7FF);
break;
}
} else {
fprintf(stderr, "Write to invalid video/object processor register %X:%X\n", address, value);
}
}
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