Mercurial > repos > blastem
view jag_video.c @ 1174:500d8deea802
Fix H32 VInt timing inconsistency
author | Michael Pavone <pavone@retrodev.com> |
---|---|
date | Mon, 16 Jan 2017 23:34:30 -0800 |
parents | 653558f6fa7a |
children |
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#include <stdint.h> #include <stdlib.h> #include <stdio.h> #include "jag_video.h" #include "jaguar.h" #include "render.h" enum { VMODE_CRY, VMODE_RGB24, VMODE_DIRECT16, VMODE_RGB16, VMODE_VARIABLE }; #define BIT_TBGEN 1 char *vmode_names[] = { "CRY", "RGB24", "RGB16", "DIRECT16", "VARIABLE" }; static uint8_t cry_red[9][16] = { {0, 34, 68, 102, 135, 169, 203, 237, 255, 255, 255, 255, 255, 255, 255, 255}, {0, 34, 68, 102, 135, 169, 203, 230, 247, 255, 255, 255, 255, 255, 255, 255}, {0, 34, 68, 102, 135, 170, 183, 197, 214, 235, 255, 255, 255, 255, 255, 255}, {0, 34, 68, 102, 130, 141, 153, 164, 181, 204, 227, 249, 255, 255, 255, 255}, {0, 34, 68, 95, 104, 113, 122, 131, 148, 173, 198, 223, 248, 255, 255, 255}, {0, 34, 64, 71, 78, 85, 91, 98, 115, 143, 170, 197, 224, 252, 255, 255}, {0, 34, 43, 47, 52, 56, 61, 65, 82, 112, 141, 171, 200, 230, 255, 255}, {0, 19, 21, 23, 26, 28, 30, 32, 49, 81, 113, 145, 177, 208, 240, 255}, {0, 0, 0, 0, 0, 0, 0, 0, 17, 51, 85, 119, 153, 187, 221, 255} }; static uint8_t cry_green[16][8] = { {0, 0, 0, 0, 0, 0, 0, 0}, {17, 19, 21, 23, 26, 28, 30, 32}, {34, 38, 43, 47, 52, 56, 61, 65}, {51, 57, 64, 71, 78, 85, 91, 98}, {68, 77, 86, 95, 104, 113, 122, 131}, {85, 96, 107, 119, 130, 141, 153, 164}, {102, 115, 129, 142, 156, 170, 183, 197}, {119, 134, 150, 166, 182, 198, 214, 230}, {136, 154, 172, 190, 208, 226, 244, 255}, {153, 173, 193, 214, 234, 255, 255, 255}, {170, 192, 215, 238, 255, 255, 255, 255}, {187, 211, 236, 255, 255, 255, 255, 255}, {204, 231, 255, 255, 255, 255, 255, 255}, {221, 250, 255, 255, 255, 255, 255, 255}, {238, 255, 255, 255, 255, 255, 255, 255}, {255, 255, 255, 255, 255, 255, 255, 255}, }; static uint32_t table_cry[0x10000]; static uint32_t table_rgb[0x10000]; static uint32_t table_variable[0x10000]; static uint32_t cry_to_rgb(uint16_t cry) { uint32_t y = cry & 0xFF; if (y) { uint8_t c = cry >> 8 & 0xF; uint8_t r = cry >> 12; uint32_t red = cry_red[c < 7 ? 0 : c - 7][r]; uint32_t green = cry_green[c][r < 8 ? r : 15 - r]; uint32_t blue = cry_red[c < 7 ? 0 : c - 7][15-r]; red = red * y / 255; blue = blue * y / 255; green = green * y / 255; return render_map_color(red, green, blue); } else { return render_map_color(0, 0, 0); } } static uint32_t rgb16_to_rgb(uint16_t rgb) { return render_map_color( rgb >> 8 & 0xF8, rgb << 2 & 0xFC, rgb >> 4 & 0xF8 ); } jag_video *jag_video_init(void) { static uint8_t table_init_done = 0; if (!table_init_done) { for (int i = 0; i < 0x10000; i++) { table_cry[i] = cry_to_rgb(i); table_rgb[i] = rgb16_to_rgb(i); table_variable[i] = i & 1 ? rgb16_to_rgb(i & 0xFFFE) : cry_to_rgb(i); } table_init_done = 1; } return calloc(1, sizeof(jag_video)); } static void copy_16(uint32_t *dst, uint32_t len, uint16_t *linebuffer, uint32_t *table) { for (; len; len--, dst++, linebuffer++) { *dst = table[*linebuffer]; } } static void copy_linebuffer(jag_video *context, uint16_t *linebuffer) { if (!context->output) { return; } uint32_t *dst = context->output; uint32_t len; if (context->regs[VID_HCOUNT] == context->regs[VID_HDISP_BEGIN1]) { if ( context->regs[VID_HDISP_BEGIN2] == context->regs[VID_HDISP_BEGIN1] || context->regs[VID_HDISP_BEGIN2] > (context->regs[VID_HPERIOD] | 0x400) ) { //only one line buffer per line, so copy the previous line in its entirety len = context->regs[VID_HDISP_END] - 0x400 + context->regs[VID_HPERIOD] - context->regs[VID_HDISP_BEGIN1] + 2; } else { //copy the second half of the previous line if (context->regs[VID_HDISP_BEGIN2] & 0x400) { //BEGIN2 is after the HCOUNT jump dst += context->regs[VID_HPERIOD] - context->regs[VID_HDISP_BEGIN1] + context->regs[VID_HDISP_BEGIN2] - 0x400 + 1; len = context->regs[VID_HDISP_END] - context->regs[VID_HDISP_BEGIN2] + 1; } else { //BEGIN2 is before the HCOUNT jump dst += context->regs[VID_HDISP_BEGIN2] - context->regs[VID_HDISP_BEGIN1]; len = context->regs[VID_HDISP_END] + context->regs[VID_HPERIOD] - context->regs[VID_HDISP_BEGIN2] + 2; } } context->output += context->output_pitch / sizeof(uint32_t); } else { //copy the first half of the current line if (context->regs[VID_HDISP_BEGIN2] & 0x400) { //BEGIN2 is after the HCOUNT jump len = context->regs[VID_HDISP_BEGIN2] - 0x400 + context->regs[VID_HPERIOD] - context->regs[VID_HDISP_BEGIN1] + 1; } else { //BEGIN2 is before the HCOUNT jump len = context->regs[VID_HDISP_BEGIN2] - context->regs[VID_HDISP_BEGIN1]; } } len /= context->pclock_div; switch (context->mode) { case VMODE_CRY: copy_16(dst, len, linebuffer, table_cry); break; case VMODE_RGB24: //TODO: Implement me break; case VMODE_DIRECT16: //TODO: Implement this once I better understand what would happen on hardware with composite output break; case VMODE_RGB16: copy_16(dst, len, linebuffer, table_rgb); break; case VMODE_VARIABLE: copy_16(dst, len, linebuffer, table_variable); break; } } enum { OBJ_IDLE, OBJ_FETCH_DESC1, OBJ_FETCH_DESC2, OBJ_FETCH_DESC3, OBJ_PROCESS, OBJ_HEIGHT_WB, OBJ_REMAINDER_WB, OBJ_GPU_WAIT }; enum { OBJ_BITMAP, OBJ_SCALED, OBJ_GPU, OBJ_BRANCH, OBJ_STOP }; uint32_t jag_cycles_to_halfline(jag_video *context, uint32_t target) { uint32_t cycles = context->regs[VID_HPERIOD] - (context->regs[VID_HCOUNT] & 0x3FF); uint32_t num_lines; if (context->regs[VID_VCOUNT] < target) { num_lines = target - 1 - context->regs[VID_VCOUNT]; } else { num_lines = target + context->regs[VID_VPERIOD] - context->regs[VID_VCOUNT]; } cycles += num_lines * context->regs[VID_HPERIOD]; return cycles; } uint32_t jag_next_vid_interrupt(jag_video *context) { if (context->regs[VID_VINT] > context->regs[VID_VPERIOD]) { return 0xFFFFFFF; } return context->cycles + jag_cycles_to_halfline(context, context->regs[VID_VINT]); } void op_run(jag_video *context) { while (context->op.cycles < context->cycles) { switch (context->op.state) { case OBJ_IDLE: case OBJ_GPU_WAIT: context->op.cycles = context->cycles; break; case OBJ_FETCH_DESC1: { uint32_t address = context->regs[VID_OBJLIST1] | context->regs[VID_OBJLIST2] << 16; uint64_t val = jag_read_phrase(context->system, address, &context->op.cycles); address += 8; context->regs[VID_OBJ0] = val >> 48; context->regs[VID_OBJ1] = val >> 32; context->regs[VID_OBJ2] = val >> 16; context->regs[VID_OBJ3] = val; context->op.type = val & 7; context->op.has_prefetch = 0; uint16_t ypos = val >> 3 & 0x7FF; switch (context->op.type) { case OBJ_BITMAP: case OBJ_SCALED: { uint16_t height = val >> 14 & 0x7FF; uint32_t link = (address & 0xC00007) | (val >> 21 & 0x3FFFF8); if ((ypos == 0x7FF || context->regs[VID_VCOUNT] >= ypos) && height) { context->op.state = OBJ_FETCH_DESC2; context->op.obj_start = address - 8; context->op.ypos = ypos; context->op.height = height; context->op.link = link; context->op.data_address = val >> 40 & 0xFFFFF8; context->op.cur_address = context->op.data_address; } else { //object is not visible on this line, advance to next object address = link; } break; } case OBJ_GPU: context->op.state = OBJ_GPU_WAIT; break; case OBJ_BRANCH: { uint8_t branch; switch(val >> 14 & 7) { case 0: branch = ypos == context->regs[VID_VCOUNT] || ypos == 0x7FF; break; case 1: branch = ypos > context->regs[VID_VCOUNT]; break; case 2: branch = ypos < context->regs[VID_VCOUNT]; break; case 3: branch = context->regs[VID_OBJFLAG] & 1; break; case 4: branch = (context->regs[VID_HCOUNT] & 0x400) != 0; break; default: branch = 0; fprintf(stderr, "Invalid branch CC type %d in object at %X\n", (int)(val >> 14 & 7), address-8); break; } if (branch) { address &= 0xC00007; address |= val >> 21 & 0x3FFFF8; } } case OBJ_STOP: //TODO: trigger interrupt context->op.state = OBJ_IDLE; break; } context->regs[VID_OBJLIST1] = address; context->regs[VID_OBJLIST2] = address >> 16; break; } case OBJ_FETCH_DESC2: { uint32_t address = context->regs[VID_OBJLIST1] | context->regs[VID_OBJLIST2] << 16; uint64_t val = jag_read_phrase(context->system, address, &context->op.cycles); address += 8; context->op.xpos = val & 0xFFF; if (context->op.xpos & 0x800) { context->op.xpos |= 0xF000; } context->op.increment = (val >> 15 & 0x7) * 8; context->op.bpp = 1 << (val >> 12 & 7); if (context->op.bpp == 32) { context->op.bpp = 24; } context->op.line_pitch = (val >> 18 & 0x3FF) * 8; if (context->op.bpp < 8) { context->op.pal_offset = val >> 37; if (context->op.bpp == 4) { context->op.pal_offset &= 0xF0; } else if(context->op.bpp == 2) { context->op.pal_offset &= 0xFC; } else { context->op.pal_offset &= 0xFE; } } else { context->op.pal_offset = 0; } context->op.line_phrases = val >> 28 & 0x3FF; context->op.hflip = (val & (1UL << 45)) != 0; context->op.addpixels = (val & (1UL << 46)) != 0; context->op.transparent = (val & (1UL << 47)) != 0; //TODO: do something with RELEASE flag context->op.leftclip = val >> 49; if (context->op.type == OBJ_SCALED) { context->op.state = OBJ_FETCH_DESC3; switch (context->op.bpp) { case 1: context->op.leftclip &= 0x3F; break; //documentation isn't clear exactly how this works for higher bpp values case 2: context->op.leftclip &= 0x3E; break; case 4: context->op.leftclip &= 0x3C; break; case 8: context->op.leftclip &= 0x38; break; case 16: context->op.leftclip &= 0x30; break; default: context->op.leftclip = 0x20; break; } } else { context->op.state = OBJ_PROCESS; address = context->op.link; switch (context->op.bpp) { case 1: context->op.leftclip &= 0x3E; break; case 2: context->op.leftclip &= 0x3C; break; //values for 4bpp and up are sort of a guess case 4: context->op.leftclip &= 0x38; break; case 8: context->op.leftclip &= 0x30; break; case 16: context->op.leftclip &= 0x20; break; default: context->op.leftclip = 0; break; } } if (context->op.xpos < 0) { int16_t pixels_per_phrase = 64 / context->op.bpp; int16_t clip = -context->op.xpos / pixels_per_phrase; int16_t rem = -context->op.xpos % pixels_per_phrase; if (clip >= context->op.line_phrases) { context->op.line_phrases = 0; } else { context->op.line_phrases -= clip; context->op.leftclip += rem * context->op.bpp; if (context->op.leftclip >= 64) { context->op.line_phrases--; context->op.leftclip -= 64; } } } else if (context->op.bpp < 32){ context->op.lb_offset = context->op.xpos; } else { context->op.lb_offset = context->op.xpos * 2; } if (context->op.lb_offset >= LINEBUFFER_WORDS || !context->op.line_phrases) { //ignore objects that are completely offscreen //not sure if that's how the hardware does it, but it would make sense context->op.state = OBJ_FETCH_DESC1; address = context->op.link; } context->regs[VID_OBJLIST1] = address; context->regs[VID_OBJLIST2] = address >> 16; break; } case OBJ_FETCH_DESC3: { uint32_t address = context->regs[VID_OBJLIST1] | context->regs[VID_OBJLIST2] << 16; uint64_t val = jag_read_phrase(context->system, address, &context->op.cycles); context->op.state = OBJ_PROCESS; context->op.hscale = val & 0xFF;; context->op.hremainder = val & 0xFF; context->op.vscale = val >> 8 & 0xFF; context->op.remainder = val >> 16 & 0xFF; context->regs[VID_OBJLIST1] = context->op.link; context->regs[VID_OBJLIST2] = context->op.link >> 16; break; } case OBJ_PROCESS: { uint32_t proc_cycles = 0; if (!context->op.has_prefetch && context->op.line_phrases) { context->op.prefetch = jag_read_phrase(context->system, context->op.cur_address, &proc_cycles); context->op.cur_address += context->op.increment; context->op.has_prefetch = 1; context->op.line_phrases--; } if (!proc_cycles) { //run at least one cycle of writes even if we didn't spend any time reading proc_cycles = 1; } while (proc_cycles) { if (context->op.im_bits) { uint32_t val = context->op.im_data >> (context->op.im_bits - context->op.bpp); val &= (1 << context->op.bpp) - 1; if (val || !context->op.transparent) { if (context->op.bpp < 16) { val = context->clut[val + context->op.pal_offset]; } if (context->op.bpp == 32) { context->write_line_buffer[context->op.lb_offset++] = val >> 16; } context->write_line_buffer[context->op.lb_offset++] = val; } else { context->op.lb_offset += context->op.bpp == 32 ? 2 : 1; } if (context->op.type == OBJ_SCALED) { context->op.hremainder -= 0x20; while (context->op.hremainder <= 0 && context->op.im_bits) { context->op.im_bits -= context->op.bpp; context->op.hremainder += context->op.hscale; } } else { context->op.im_bits -= context->op.bpp; } } if (context->op.im_bits && context->op.bpp < 32 && context->op.type == OBJ_BITMAP && context->op.lb_offset < LINEBUFFER_WORDS) { uint32_t val = context->op.im_data >> (context->op.im_bits - context->op.bpp); val &= (1 << context->op.bpp) - 1; if (val || !context->op.transparent) { val = context->clut[val + context->op.pal_offset]; context->write_line_buffer[context->op.lb_offset] = val; } context->op.lb_offset++; context->op.im_bits -= context->op.bpp; } context->op_cycles++; proc_cycles--; } if (!context->op.im_bits && context->op.has_prefetch) { context->op.im_data = context->op.prefetch; context->op.has_prefetch = 0; //docs say this is supposed to be a value in pixels //but given the "significant" bits part I'm guessing //this is actually how many bits are pre-shifted off //the first phrase read in a line context->op.im_bits = 64 - context->op.leftclip; context->op.leftclip = 0; } if (context->op.lb_offset == LINEBUFFER_WORDS || (!context->op.im_bits && !context->op.line_phrases)) { context->op.state = OBJ_HEIGHT_WB; } break; } case OBJ_HEIGHT_WB: { if (context->op.type == OBJ_BITMAP) { context->op.height--; context->op.data_address += context->op.line_pitch; context->op.state = OBJ_FETCH_DESC1; } else { context->op.remainder -= 0x20; context->op.state = OBJ_REMAINDER_WB; while (context->op.height && context->op.remainder <= 0) { context->op.height--; context->op.remainder += context->op.vscale; context->op.data_address += context->op.line_pitch; } } uint64_t val = context->op.type | context->op.ypos << 3 | context->op.height << 14 | ((uint64_t)context->op.link & 0x3FFFF8) << 21 | ((uint64_t)context->op.data_address) << 40; context->op.cycles += jag_write_phrase(context->system, context->op.obj_start, val); break; } case OBJ_REMAINDER_WB: { uint64_t val = context->op.hscale | context->op.vscale << 8 | context->op.remainder << 16; context->op.cycles += jag_write_phrase(context->system, context->op.obj_start+16, val); context->op.state = OBJ_FETCH_DESC1; break; } } } } void jag_video_run(jag_video *context, uint32_t target_cycle) { if (context->regs[VID_VMODE] & BIT_TBGEN) { while (context->cycles < target_cycle) { //TODO: Optimize this to not actually increment one step at a time if ( ( context->regs[VID_HCOUNT] == context->regs[VID_HDISP_BEGIN1] || context->regs[VID_HCOUNT] == context->regs[VID_HDISP_BEGIN2] ) && context->regs[VID_VCOUNT] >= context->regs[VID_VDISP_BEGIN] && context->regs[VID_VCOUNT] < context->regs[VID_VDISP_END] ) { //swap linebuffers, render linebuffer to framebuffer and kick off object processor if (context->write_line_buffer == context->line_buffer_a) { context->write_line_buffer = context->line_buffer_b; copy_linebuffer(context, context->line_buffer_a); } else { context->write_line_buffer = context->line_buffer_a; copy_linebuffer(context, context->line_buffer_b); } //clear new write line buffer with background color for (int i = 0; i < LINEBUFFER_WORDS; i++) { context->write_line_buffer[i] = context->regs[VID_BGCOLOR]; } //kick off object processor context->op.state = OBJ_FETCH_DESC1; } else if (context->regs[VID_HCOUNT] == context->regs[VID_HDISP_END]) { //stob object processor context->op.state = OBJ_IDLE; } context->cycles++; op_run(context); //advance counters if ( !context->output && context->regs[VID_VCOUNT] == context->regs[VID_VDISP_BEGIN] && context->regs[VID_HCOUNT] == context->regs[VID_HDISP_BEGIN1] ) { context->output = render_get_framebuffer(FRAMEBUFFER_ODD, &context->output_pitch); } else if (context->output && context->regs[VID_VCOUNT] >= context->regs[VID_VDISP_END]) { int width = (context->regs[VID_HPERIOD] - context->regs[VID_HDISP_BEGIN1] + context->regs[VID_HDISP_END] - 1024 + 2) / context->pclock_div; render_framebuffer_updated(FRAMEBUFFER_ODD, width); context->output = NULL; } if ((context->regs[VID_HCOUNT] & 0x3FF) == context->regs[VID_HPERIOD]) { //reset bottom 10 bits to zero, flip the 11th bit which represents which half of the line we're on context->regs[VID_HCOUNT] = (context->regs[VID_HCOUNT] & 0x400) ^ 0x400; //increment half-line counter if (context->regs[VID_VCOUNT] == context->regs[VID_VPERIOD]) { context->regs[VID_VCOUNT] = 0; } else { context->regs[VID_VCOUNT]++; if (context->regs[VID_VCOUNT] == context->regs[VID_VINT]) { context->cpu_int_pending |= BIT_CPU_VID_INT_ENABLED; } } } else { context->regs[VID_HCOUNT]++; } } } else { 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 & BIT_TBGEN ? "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); } }