Zack Buhman
511bfd1d0c
This is now provided by default in saturn/common.mk. Also updates moved header names, changed bit macro names, and changes to the common.mk build process.
76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
#include <stdint.h>
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#include "vdp2.h"
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#include "vdp1.h"
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void main()
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{
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// DISP: Please make sure to change this bit from 0 to 1 during V blank.
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vdp2.reg.TVMD = ( TVMD__DISP | TVMD__LSMD__NON_INTERLACE
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| TVMD__VRESO__240 | TVMD__HRESO__NORMAL_320);
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// VDP2 User's Manual:
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// "When sprite data is in an RGB format, sprite register 0 is selected"
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// "When the value of a priority number is 0h, it is read as transparent"
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//
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// The power-on value of PRISA is zero. Set the priority for sprite register 0
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// to some number greater than zero, so that the color data is not interpreted
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// as "transparent".
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vdp2.reg.PRISA = PRISA__S0PRIN(1); // Sprite register 0 Priority Number
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/* TVM settings must be performed from the second H-blank IN interrupt after the
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V-blank IN interrupt to the H-blank IN interrupt immediately after the V-blank
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OUT interrupt. */
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// "normal" display resolution, 16 bits per pixel, 512x256 framebuffer
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vdp1.reg.TVMR = TVMR__TVM__NORMAL;
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// swap framebuffers every 1 cycle; non-interlace
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vdp1.reg.FBCR = 0;
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// during a framebuffer erase cycle, write the color "black" to each pixel
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constexpr uint16_t black = 0x0000;
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vdp1.reg.EWDR = black;
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// the EWLR/EWRR macros use somewhat nontrivial math for the X coordinates
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// erase upper-left coordinate
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vdp1.reg.EWLR = EWLR__16BPP_X1(0) | EWLR__Y1(0);
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// erase lower-right coordinate
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vdp1.reg.EWRR = EWRR__16BPP_X3(319) | EWRR__Y3(239);
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vdp1.vram.cmd[0].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__SYSTEM_CLIP_COORDINATES;
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vdp1.vram.cmd[0].LINK = 0;
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vdp1.vram.cmd[0].XC = 319;
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vdp1.vram.cmd[0].YC = 239;
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vdp1.vram.cmd[1].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__LOCAL_COORDINATE;
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vdp1.vram.cmd[1].LINK = 0;
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vdp1.vram.cmd[1].XA = 0;
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vdp1.vram.cmd[1].YA = 0;
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constexpr uint16_t magenta = (31 << 10) | (31 << 0);
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vdp1.vram.cmd[2].CTRL = CTRL__JP__JUMP_NEXT | CTRL__COMM__POLYGON;
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vdp1.vram.cmd[2].LINK = 0;
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// "Set [ECD] to '1' for polygons, polylines, and lines"
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// "Be sure to set [SPD] to '1' for polygons, polylines, and lines"
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//
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// The "user clip mode" bit is not set in PMOD here, so setting "user clip
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// coordinates" has no effect on this draw command. However, "system clip
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// coordinates" and "local coordinates" are always applied, and must be set to
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// reasonable values.
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vdp1.vram.cmd[2].PMOD = PMOD__ECD | PMOD__SPD;
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vdp1.vram.cmd[2].COLR = COLR__RGB | magenta; // non-palettized (rgb15) color data
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vdp1.vram.cmd[2].XA = 100;
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vdp1.vram.cmd[2].YA = 50;
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vdp1.vram.cmd[2].XB = 150;
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vdp1.vram.cmd[2].YB = 100;
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vdp1.vram.cmd[2].XC = 100;
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vdp1.vram.cmd[2].YC = 150;
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vdp1.vram.cmd[2].XD = 50;
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vdp1.vram.cmd[2].YD = 100;
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vdp1.vram.cmd[3].CTRL = CTRL__END;
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// start drawing (execute the command list) on every frame
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vdp1.reg.PTMR = PTMR__PTM__FRAME_CHANGE;
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}
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