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Merged
mkalkbrenner merged 1 commit into from
Dec 25, 2025
Merged

plane history #28

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26 changes: 23 additions & 3 deletions src/dmdreader.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,7 @@ uint16_t source_pixelsperframe;
uint16_t source_dwordsperplane;
uint16_t source_bytesperplane;
uint16_t source_planesperframe;
uint16_t source_planehistoryperframe;
uint16_t source_dwordsperframe;
uint16_t source_bytesperframe;
uint16_t source_lineoversampling;
Expand All @@ -124,9 +125,9 @@ uint16_t source_mergeplanes;
// the buffers need to be aligned to 4 byte because we work with uint32_t
// pointers later. raw data read from DMD
uint8_t planebuf1[MAX_WIDTH * MAX_HEIGHT * MAX_BITSPERPIXEL *
MAX_PLANESPERFRAME / 8] __attribute__((aligned(4)));
MAX_PLANESPERFRAME / 8] __attribute__((aligned(4))) = {0};
uint8_t planebuf2[MAX_WIDTH * MAX_HEIGHT * MAX_BITSPERPIXEL *
MAX_PLANESPERFRAME / 8] __attribute__((aligned(4)));
MAX_PLANESPERFRAME / 8] __attribute__((aligned(4))) = {0};
uint8_t *currentPlaneBuffer = planebuf2;

// processed frame (merged planes)
Expand Down Expand Up @@ -453,6 +454,7 @@ convert_4bit_to_2bit_fast(uint32_t input) {
// -------------------------------

void switch_buffers() {
uint8_t *previousPlaneBuffer = currentPlaneBuffer;
// Switch to next plane and frame buffers
if (currentPlaneBuffer == planebuf1) {
currentPlaneBuffer = planebuf2;
Expand All @@ -463,6 +465,13 @@ void switch_buffers() {
current_framebuf = framebuf1;
framebuf_to_send = framebuf2;
}
if (source_planehistoryperframe > 0) {
memcpy(&currentPlaneBuffer[source_bytesperplane *
(source_planesperframe -
source_planehistoryperframe)],
previousPlaneBuffer,
source_bytesperplane * source_planehistoryperframe);
}
}

/**
Expand Down Expand Up @@ -741,6 +750,7 @@ void dmdreader_init() {
source_bitsperpixel = 2;
target_bitsperpixel = 2;
source_planesperframe = 3;
source_planehistoryperframe = 2;
source_lineoversampling = LINEOVERSAMPLING_NONE;
source_mergeplanes = MERGEPLANES_ADD;
break;
Expand All @@ -762,6 +772,7 @@ void dmdreader_init() {
// in Whitestar, there's only one plane, containg
// one LSB row followed by one MSB row and so on
source_planesperframe = 1;
source_planehistoryperframe = 0;
// in Whitestar each line is sent twice
source_lineoversampling = LINEOVERSAMPLING_2X;
source_mergeplanes = MERGEPLANES_NONE;
Expand All @@ -781,6 +792,7 @@ void dmdreader_init() {
source_bitsperpixel = 4;
target_bitsperpixel = 4;
source_planesperframe = 4; // in Spike there are 4 planes
source_planehistoryperframe = 0;
source_lineoversampling = LINEOVERSAMPLING_NONE; // no line oversampling
source_mergeplanes = MERGEPLANES_ADDSHIFT;
break;
Expand All @@ -798,6 +810,7 @@ void dmdreader_init() {
source_bitsperpixel = 4;
target_bitsperpixel = 4;
source_planesperframe = 1; // in SAM there is one plane
source_planehistoryperframe = 0;
// with 4x line oversampling
source_lineoversampling = LINEOVERSAMPLING_4X;
source_mergeplanes = MERGEPLANES_NONE;
Expand All @@ -819,6 +832,7 @@ void dmdreader_init() {
// in DE-Sega, there's only one plane,
// containg one LSB row followed by one MSB row and so on
source_planesperframe = 1;
source_planehistoryperframe = 0;
// in DE-Sega each line is sent twice
source_lineoversampling = LINEOVERSAMPLING_2X;
source_mergeplanes = MERGEPLANES_NONE;
Expand All @@ -840,6 +854,7 @@ void dmdreader_init() {
// in DE-Sega, there's only one plane,
// containg one LSB row followed by one MSB row and so on
source_planesperframe = 1;
source_planehistoryperframe = 0;
// in DE-Sega each line is sent twice
source_lineoversampling = LINEOVERSAMPLING_2X;
source_mergeplanes = MERGEPLANES_NONE;
Expand All @@ -860,6 +875,7 @@ void dmdreader_init() {
source_bitsperpixel = 4;
target_bitsperpixel = 2;
source_planesperframe = 6;
source_planehistoryperframe = 0;
source_lineoversampling = LINEOVERSAMPLING_NONE;
source_mergeplanes = MERGEPLANES_ADD;
break;
Expand All @@ -878,6 +894,7 @@ void dmdreader_init() {
source_bitsperpixel = 4;
target_bitsperpixel = 4;
source_planesperframe = 1; // in Alvin G there is one plane
source_planehistoryperframe = 0;
// with 4x line oversampling
source_lineoversampling = LINEOVERSAMPLING_4X;
source_mergeplanes = MERGEPLANES_NONE;
Expand All @@ -897,6 +914,7 @@ void dmdreader_init() {
source_bitsperpixel = 4;
target_bitsperpixel = 2;
source_planesperframe = 4;
source_planehistoryperframe = 0;
source_lineoversampling = LINEOVERSAMPLING_NONE;
source_mergeplanes = MERGEPLANES_ADD;
break;
Expand All @@ -916,6 +934,7 @@ void dmdreader_init() {
source_bitsperpixel = 4;
target_bitsperpixel = 2;
source_planesperframe = 4;
source_planehistoryperframe = 0;
source_lineoversampling = LINEOVERSAMPLING_NONE;
source_mergeplanes = MERGEPLANES_ADD;
break;
Expand All @@ -936,7 +955,8 @@ void dmdreader_init() {
source_dwordsperplane *= 4;
}
source_bytesperplane = source_bytes;
source_dwordsperframe = source_dwordsperplane * source_planesperframe;
source_dwordsperframe = source_dwordsperplane *
(source_planesperframe - source_planehistoryperframe);
source_bytesperframe = source_bytesperplane * source_planesperframe;
source_dwordsperline = source_width * source_bitsperpixel / 32;

Expand Down
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