diff options
Diffstat (limited to 'jag_video.c')
| -rw-r--r-- | jag_video.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/jag_video.c b/jag_video.c index fd484b2..a50a34e 100644 --- a/jag_video.c +++ b/jag_video.c @@ -1,7 +1,23 @@ #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)); @@ -10,4 +26,78 @@ jag_video *jag_video_init(void) 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); + } } |