mirror of
https://github.com/TomHarte/CLK.git
synced 2024-07-09 06:29:33 +00:00
Moves the stuff of generating pixels out of the main loop.
This commit is contained in:
Thomas Harte
parent
f8d46f8f3d
commit
17bf1a64bf
@ -10,8 +10,9 @@
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using namespace AppleII::Video;
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VideoBase::VideoBase() :
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crt_(new Outputs::CRT::CRT(910, 1, Outputs::CRT::DisplayType::NTSC60, 1)) {
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VideoBase::VideoBase(bool is_iie) :
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crt_(new Outputs::CRT::CRT(910, 1, Outputs::CRT::DisplayType::NTSC60, 1)),
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is_iie_(is_iie) {
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// Set a composite sampling function that assumes one byte per pixel input, and
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// accepts any non-zero value as being fully on, zero being fully off.
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@ -115,3 +116,180 @@ void VideoBase::set_character_rom(const std::vector<uint8_t> &character_rom) {
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}
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}
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}
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uint8_t *VideoBase::output_text(uint8_t *target, uint8_t *source, size_t length, size_t pixel_row) {
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const uint8_t inverses[] = {
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0xff,
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is_iie_ ? static_cast<uint8_t>(0xff) : static_cast<uint8_t>((flash_ / flash_length) * 0xff),
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is_iie_ ? static_cast<uint8_t>(0xff) : static_cast<uint8_t>(0x00),
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is_iie_ ? static_cast<uint8_t>(0xff) : static_cast<uint8_t>(0x00)
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};
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const int or_mask = alternative_character_set_ ? 0x100 : 0x000;
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const int and_mask = is_iie_ ? ~0 : 0x3f;
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for(size_t c = 0; c < length; ++c) {
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const int character = (source[c] | or_mask) & and_mask;
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const uint8_t xor_mask = inverses[character >> 6];
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const std::size_t character_address = static_cast<std::size_t>(character << 3) + pixel_row;
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const uint8_t character_pattern = character_rom_[character_address] ^ xor_mask;
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// The character ROM is output MSB to LSB rather than LSB to MSB.
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target[0] = character_pattern & 0x40;
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target[1] = character_pattern & 0x20;
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target[2] = character_pattern & 0x10;
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target[3] = character_pattern & 0x08;
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target[4] = character_pattern & 0x04;
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target[5] = character_pattern & 0x02;
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target[6] = character_pattern & 0x01;
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graphics_carry_ = character_pattern & 0x01;
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target += 7;
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}
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return target;
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}
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uint8_t *VideoBase::output_double_text(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, size_t pixel_row) {
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for(size_t c = 0; c < length; ++c) {
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const std::size_t character_addresses[2] = {
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static_cast<std::size_t>(
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auxiliary_source[c] << 3
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) + pixel_row,
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static_cast<std::size_t>(
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source[c] << 3
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) + pixel_row,
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};
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const size_t pattern_offset = alternative_character_set_ ? (256*8) : 0;
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const uint8_t character_patterns[2] = {
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character_rom_[character_addresses[0] + pattern_offset],
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character_rom_[character_addresses[1] + pattern_offset],
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};
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// The character ROM is output MSB to LSB rather than LSB to MSB.
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target[0] = character_patterns[0] & 0x40;
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target[1] = character_patterns[0] & 0x20;
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target[2] = character_patterns[0] & 0x10;
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target[3] = character_patterns[0] & 0x08;
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target[4] = character_patterns[0] & 0x04;
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target[5] = character_patterns[0] & 0x02;
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target[6] = character_patterns[0] & 0x01;
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target[7] = character_patterns[1] & 0x40;
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target[8] = character_patterns[1] & 0x20;
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target[9] = character_patterns[1] & 0x10;
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target[10] = character_patterns[1] & 0x08;
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target[11] = character_patterns[1] & 0x04;
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target[12] = character_patterns[1] & 0x02;
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target[13] = character_patterns[1] & 0x01;
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graphics_carry_ = character_patterns[1] & 0x01;
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target += 14;
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}
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return target;
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}
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uint8_t *VideoBase::output_low_resolution(uint8_t *target, uint8_t *source, size_t length, int row) {
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const int row_shift = row&4;
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for(size_t c = 0; c < length; ++c) {
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// Low-resolution graphics mode shifts the colour code on a loop, but has to account for whether this
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// 14-sample output window is starting at the beginning of a colour cycle or halfway through.
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if(c&1) {
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target[0] = target[4] = target[8] = target[12] = (source[c] >> row_shift) & 4;
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target[1] = target[5] = target[9] = target[13] = (source[c] >> row_shift) & 8;
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target[2] = target[6] = target[10] = (source[c] >> row_shift) & 1;
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target[3] = target[7] = target[11] = (source[c] >> row_shift) & 2;
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graphics_carry_ = (source[c] >> row_shift) & 8;
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} else {
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target[0] = target[4] = target[8] = target[12] = (source[c] >> row_shift) & 1;
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target[1] = target[5] = target[9] = target[13] = (source[c] >> row_shift) & 2;
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target[2] = target[6] = target[10] = (source[c] >> row_shift) & 4;
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target[3] = target[7] = target[11] = (source[c] >> row_shift) & 8;
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graphics_carry_ = (source[c] >> row_shift) & 2;
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}
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target += 14;
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}
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return target;
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}
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uint8_t *VideoBase::output_double_low_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, int row) {
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const int row_shift = row&4;
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for(size_t c = 0; c < length; ++c) {
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if(c&1) {
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target[0] = target[4] = (auxiliary_source[c] >> row_shift) & 2;
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target[1] = target[5] = (auxiliary_source[c] >> row_shift) & 4;
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target[2] = target[6] = (auxiliary_source[c] >> row_shift) & 8;
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target[3] = (auxiliary_source[c] >> row_shift) & 1;
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target[8] = target[12] = (source[c] >> row_shift) & 4;
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target[9] = target[13] = (source[c] >> row_shift) & 8;
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target[10] = (source[c] >> row_shift) & 1;
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target[7] = target[11] = (source[c] >> row_shift) & 2;
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graphics_carry_ = (source[c] >> row_shift) & 8;
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} else {
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target[0] = target[4] = (auxiliary_source[c] >> row_shift) & 8;
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target[1] = target[5] = (auxiliary_source[c] >> row_shift) & 1;
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target[2] = target[6] = (auxiliary_source[c] >> row_shift) & 2;
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target[3] = (auxiliary_source[c] >> row_shift) & 4;
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target[8] = target[12] = (source[c] >> row_shift) & 1;
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target[9] = target[13] = (source[c] >> row_shift) & 2;
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target[10] = (source[c] >> row_shift) & 4;
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target[7] = target[11] = (source[c] >> row_shift) & 8;
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graphics_carry_ = (source[c] >> row_shift) & 2;
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}
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target += 14;
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}
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return target;
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}
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uint8_t *VideoBase::output_high_resolution(uint8_t *target, uint8_t *source, size_t length) {
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for(size_t c = 0; c < length; ++c) {
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// High resolution graphics shift out LSB to MSB, optionally with a delay of half a pixel.
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// If there is a delay, the previous output level is held to bridge the gap.
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if(base_stream_[c] & 0x80) {
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target[0] = graphics_carry_;
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target[1] = target[2] = source[c] & 0x01;
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target[3] = target[4] = source[c] & 0x02;
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target[5] = target[6] = source[c] & 0x04;
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target[7] = target[8] = source[c] & 0x08;
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target[9] = target[10] = source[c] & 0x10;
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target[11] = target[12] = source[c] & 0x20;
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target[13] = source[c] & 0x40;
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} else {
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target[0] = target[1] = source[c] & 0x01;
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target[2] = target[3] = source[c] & 0x02;
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target[4] = target[5] = source[c] & 0x04;
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target[6] = target[7] = source[c] & 0x08;
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target[8] = target[9] = source[c] & 0x10;
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target[10] = target[11] = source[c] & 0x20;
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target[12] = target[13] = source[c] & 0x40;
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}
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graphics_carry_ = source[c] & 0x40;
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target += 14;
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}
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return target;
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}
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uint8_t *VideoBase::output_double_high_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length) {
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for(size_t c = 0; c < length; ++c) {
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target[0] = graphics_carry_;
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target[1] = auxiliary_source[c] & 0x01;
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target[2] = auxiliary_source[c] & 0x02;
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target[3] = auxiliary_source[c] & 0x04;
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target[4] = auxiliary_source[c] & 0x08;
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target[5] = auxiliary_source[c] & 0x10;
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target[6] = auxiliary_source[c] & 0x20;
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target[7] = auxiliary_source[c] & 0x40;
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target[8] = auxiliary_source[c] & 0x01;
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target[9] = auxiliary_source[c] & 0x02;
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target[10] = auxiliary_source[c] & 0x04;
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target[11] = auxiliary_source[c] & 0x08;
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target[12] = auxiliary_source[c] & 0x10;
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target[13] = auxiliary_source[c] & 0x20;
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graphics_carry_ = auxiliary_source[c] & 0x40;
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pixel_pointer_ += 14;
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}
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return target;
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}
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@ -33,7 +33,7 @@ class BusHandler {
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class VideoBase {
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public:
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VideoBase();
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VideoBase(bool is_iie);
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/// @returns The CRT this video feed is feeding.
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Outputs::CRT::CRT *get_crt();
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@ -190,13 +190,52 @@ class VideoBase {
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// without having to worry about a rolling buffer.
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std::array<uint8_t, 40> base_stream_;
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std::array<uint8_t, 40> auxiliary_stream_;
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bool is_iie_ = false;
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static const int flash_length = 8406;
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/*!
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Outputs 40-column text to @c target, using @c length bytes from @c source.
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@return One byte after the final value written to @c target.
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*/
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uint8_t *output_text(uint8_t *target, uint8_t *source, size_t length, size_t pixel_row);
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/*!
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Outputs 80-column text to @c target, drawing @c length columns from @c source and @c auxiliary_source.
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@return One byte after the final value written to @c target.
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*/
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uint8_t *output_double_text(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, size_t pixel_row);
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/*!
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Outputs 40-column low-resolution graphics to @c target, drawing @c length columns from @c source.
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@return One byte after the final value written to @c target.
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*/
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uint8_t *output_low_resolution(uint8_t *target, uint8_t *source, size_t length, int row);
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/*!
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Outputs 80-column low-resolution graphics to @c target, drawing @c length columns from @c source and @c auxiliary_source.
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@return One byte after the final value written to @c target.
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*/
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uint8_t *output_double_low_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length, int row);
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/*!
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Outputs 40-column high-resolution graphics to @c target, drawing @c length columns from @c source.
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@return One byte after the final value written to @c target.
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*/
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uint8_t *output_high_resolution(uint8_t *target, uint8_t *source, size_t length);
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/*!
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Outputs 80-column double-high-resolution graphics to @c target, drawing @c length columns from @c source.
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@return One byte after the final value written to @c target.
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*/
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uint8_t *output_double_high_resolution(uint8_t *target, uint8_t *source, uint8_t *auxiliary_source, size_t length);
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};
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template <class BusHandler, bool is_iie> class Video: public VideoBase {
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public:
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/// Constructs an instance of the video feed; a CRT is also created.
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Video(BusHandler &bus_handler) :
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VideoBase(),
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VideoBase(is_iie),
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bus_handler_(bus_handler) {}
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/*!
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@ -276,173 +315,54 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
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}
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switch(line_mode) {
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case GraphicsMode::Text: {
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const uint8_t inverses[] = {
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0xff,
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static_cast<uint8_t>((flash_ / flash_length) * 0xff),
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0x00,
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0x00
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};
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for(size_t c = column_; c < pixel_end; ++c) {
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int character = base_stream_[c];
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if(is_iie) {
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character |= alternative_character_set_ ? 0x100 : 0;
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} else {
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character &= 0x3f;
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}
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const uint8_t xor_mask = is_iie ? 0xff : inverses[character >> 6];
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const std::size_t character_address = static_cast<std::size_t>((character << 3) + pixel_row);
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const uint8_t character_pattern = character_rom_[character_address] ^ xor_mask;
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case GraphicsMode::Text:
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pixel_pointer_ = output_text(
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pixel_pointer_,
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&base_stream_[static_cast<size_t>(column_)],
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static_cast<size_t>(pixel_end - column_),
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static_cast<size_t>(pixel_row));
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break;
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// The character ROM is output MSB to LSB rather than LSB to MSB.
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pixel_pointer_[0] = character_pattern & 0x40;
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pixel_pointer_[1] = character_pattern & 0x20;
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pixel_pointer_[2] = character_pattern & 0x10;
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pixel_pointer_[3] = character_pattern & 0x08;
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pixel_pointer_[4] = character_pattern & 0x04;
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pixel_pointer_[5] = character_pattern & 0x02;
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pixel_pointer_[6] = character_pattern & 0x01;
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graphics_carry_ = character_pattern & 0x01;
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pixel_pointer_ += 7;
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}
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} break;
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case GraphicsMode::DoubleText:
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pixel_pointer_ = output_double_text(
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pixel_pointer_,
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&base_stream_[static_cast<size_t>(column_)],
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&auxiliary_stream_[static_cast<size_t>(column_)],
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static_cast<size_t>(pixel_end - column_),
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static_cast<size_t>(pixel_row));
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break;
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case GraphicsMode::DoubleText: {
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for(size_t c = column_; c < pixel_end; ++c) {
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const std::size_t character_addresses[2] = {
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static_cast<std::size_t>(
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(auxiliary_stream_[c] << 3) + pixel_row
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),
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static_cast<std::size_t>(
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(base_stream_[c] << 3) + pixel_row
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),
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};
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case GraphicsMode::LowRes:
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pixel_pointer_ = output_low_resolution(
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pixel_pointer_,
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&base_stream_[static_cast<size_t>(column_)],
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static_cast<size_t>(pixel_end - column_),
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pixel_row);
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break;
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const size_t pattern_offset = alternative_character_set_ ? (256*8) : 0;
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const uint8_t character_patterns[2] = {
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character_rom_[character_addresses[0] + pattern_offset],
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character_rom_[character_addresses[1] + pattern_offset],
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};
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case GraphicsMode::DoubleLowRes:
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pixel_pointer_ = output_double_low_resolution(
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pixel_pointer_,
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&base_stream_[static_cast<size_t>(column_)],
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&auxiliary_stream_[static_cast<size_t>(column_)],
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static_cast<size_t>(pixel_end - column_),
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pixel_row);
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break;
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// The character ROM is output MSB to LSB rather than LSB to MSB.
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pixel_pointer_[0] = character_patterns[0] & 0x40;
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pixel_pointer_[1] = character_patterns[0] & 0x20;
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pixel_pointer_[2] = character_patterns[0] & 0x10;
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pixel_pointer_[3] = character_patterns[0] & 0x08;
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pixel_pointer_[4] = character_patterns[0] & 0x04;
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pixel_pointer_[5] = character_patterns[0] & 0x02;
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pixel_pointer_[6] = character_patterns[0] & 0x01;
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pixel_pointer_[7] = character_patterns[1] & 0x40;
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pixel_pointer_[8] = character_patterns[1] & 0x20;
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pixel_pointer_[9] = character_patterns[1] & 0x10;
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pixel_pointer_[10] = character_patterns[1] & 0x08;
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pixel_pointer_[11] = character_patterns[1] & 0x04;
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pixel_pointer_[12] = character_patterns[1] & 0x02;
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pixel_pointer_[13] = character_patterns[1] & 0x01;
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graphics_carry_ = character_patterns[1] & 0x01;
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pixel_pointer_ += 14;
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}
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} break;
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case GraphicsMode::HighRes:
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pixel_pointer_ = output_high_resolution(
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pixel_pointer_,
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&base_stream_[static_cast<size_t>(column_)],
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static_cast<size_t>(pixel_end - column_));
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break;
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case GraphicsMode::DoubleLowRes: {
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const int row_shift = (row_&4);
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for(size_t c = column_; c < pixel_end; ++c) {
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if(c&1) {
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pixel_pointer_[0] = pixel_pointer_[4] = (auxiliary_stream_[c] >> row_shift) & 2;
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pixel_pointer_[1] = pixel_pointer_[5] = (auxiliary_stream_[c] >> row_shift) & 4;
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pixel_pointer_[2] = pixel_pointer_[6] = (auxiliary_stream_[c] >> row_shift) & 8;
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pixel_pointer_[3] = (auxiliary_stream_[c] >> row_shift) & 1;
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pixel_pointer_[8] = pixel_pointer_[12] = (base_stream_[c] >> row_shift) & 4;
|
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pixel_pointer_[9] = pixel_pointer_[13] = (base_stream_[c] >> row_shift) & 8;
|
||||
pixel_pointer_[10] = (base_stream_[c] >> row_shift) & 1;
|
||||
pixel_pointer_[7] = pixel_pointer_[11] = (base_stream_[c] >> row_shift) & 2;
|
||||
graphics_carry_ = (base_stream_[c] >> row_shift) & 8;
|
||||
} else {
|
||||
pixel_pointer_[0] = pixel_pointer_[4] = (auxiliary_stream_[c] >> row_shift) & 8;
|
||||
pixel_pointer_[1] = pixel_pointer_[5] = (auxiliary_stream_[c] >> row_shift) & 1;
|
||||
pixel_pointer_[2] = pixel_pointer_[6] = (auxiliary_stream_[c] >> row_shift) & 2;
|
||||
pixel_pointer_[3] = (auxiliary_stream_[c] >> row_shift) & 4;
|
||||
|
||||
pixel_pointer_[8] = pixel_pointer_[12] = (base_stream_[c] >> row_shift) & 1;
|
||||
pixel_pointer_[9] = pixel_pointer_[13] = (base_stream_[c] >> row_shift) & 2;
|
||||
pixel_pointer_[10] = (base_stream_[c] >> row_shift) & 4;
|
||||
pixel_pointer_[7] = pixel_pointer_[11] = (base_stream_[c] >> row_shift) & 8;
|
||||
graphics_carry_ = (base_stream_[c] >> row_shift) & 2;
|
||||
}
|
||||
pixel_pointer_ += 14;
|
||||
}
|
||||
} break;
|
||||
|
||||
case GraphicsMode::LowRes: {
|
||||
const int row_shift = (row_&4);
|
||||
for(size_t c = column_; c < pixel_end; ++c) {
|
||||
// Low-resolution graphics mode shifts the colour code on a loop, but has to account for whether this
|
||||
// 14-sample output window is starting at the beginning of a colour cycle or halfway through.
|
||||
if(c&1) {
|
||||
pixel_pointer_[0] = pixel_pointer_[4] = pixel_pointer_[8] = pixel_pointer_[12] = (base_stream_[c] >> row_shift) & 4;
|
||||
pixel_pointer_[1] = pixel_pointer_[5] = pixel_pointer_[9] = pixel_pointer_[13] = (base_stream_[c] >> row_shift) & 8;
|
||||
pixel_pointer_[2] = pixel_pointer_[6] = pixel_pointer_[10] = (base_stream_[c] >> row_shift) & 1;
|
||||
pixel_pointer_[3] = pixel_pointer_[7] = pixel_pointer_[11] = (base_stream_[c] >> row_shift) & 2;
|
||||
graphics_carry_ = (base_stream_[c] >> row_shift) & 8;
|
||||
} else {
|
||||
pixel_pointer_[0] = pixel_pointer_[4] = pixel_pointer_[8] = pixel_pointer_[12] = (base_stream_[c] >> row_shift) & 1;
|
||||
pixel_pointer_[1] = pixel_pointer_[5] = pixel_pointer_[9] = pixel_pointer_[13] = (base_stream_[c] >> row_shift) & 2;
|
||||
pixel_pointer_[2] = pixel_pointer_[6] = pixel_pointer_[10] = (base_stream_[c] >> row_shift) & 4;
|
||||
pixel_pointer_[3] = pixel_pointer_[7] = pixel_pointer_[11] = (base_stream_[c] >> row_shift) & 8;
|
||||
graphics_carry_ = (base_stream_[c] >> row_shift) & 2;
|
||||
}
|
||||
pixel_pointer_ += 14;
|
||||
}
|
||||
} break;
|
||||
|
||||
case GraphicsMode::HighRes: {
|
||||
for(size_t c = column_; c < pixel_end; ++c) {
|
||||
// High resolution graphics shift out LSB to MSB, optionally with a delay of half a pixel.
|
||||
// If there is a delay, the previous output level is held to bridge the gap.
|
||||
if(base_stream_[c] & 0x80) {
|
||||
pixel_pointer_[0] = graphics_carry_;
|
||||
pixel_pointer_[1] = pixel_pointer_[2] = base_stream_[c] & 0x01;
|
||||
pixel_pointer_[3] = pixel_pointer_[4] = base_stream_[c] & 0x02;
|
||||
pixel_pointer_[5] = pixel_pointer_[6] = base_stream_[c] & 0x04;
|
||||
pixel_pointer_[7] = pixel_pointer_[8] = base_stream_[c] & 0x08;
|
||||
pixel_pointer_[9] = pixel_pointer_[10] = base_stream_[c] & 0x10;
|
||||
pixel_pointer_[11] = pixel_pointer_[12] = base_stream_[c] & 0x20;
|
||||
pixel_pointer_[13] = base_stream_[c] & 0x40;
|
||||
} else {
|
||||
pixel_pointer_[0] = pixel_pointer_[1] = base_stream_[c] & 0x01;
|
||||
pixel_pointer_[2] = pixel_pointer_[3] = base_stream_[c] & 0x02;
|
||||
pixel_pointer_[4] = pixel_pointer_[5] = base_stream_[c] & 0x04;
|
||||
pixel_pointer_[6] = pixel_pointer_[7] = base_stream_[c] & 0x08;
|
||||
pixel_pointer_[8] = pixel_pointer_[9] = base_stream_[c] & 0x10;
|
||||
pixel_pointer_[10] = pixel_pointer_[11] = base_stream_[c] & 0x20;
|
||||
pixel_pointer_[12] = pixel_pointer_[13] = base_stream_[c] & 0x40;
|
||||
}
|
||||
graphics_carry_ = base_stream_[c] & 0x40;
|
||||
pixel_pointer_ += 14;
|
||||
}
|
||||
} break;
|
||||
|
||||
case GraphicsMode::DoubleHighRes: {
|
||||
for(size_t c = column_; c < pixel_end; ++c) {
|
||||
pixel_pointer_[0] = graphics_carry_;
|
||||
pixel_pointer_[1] = auxiliary_stream_[c] & 0x01;
|
||||
pixel_pointer_[2] = auxiliary_stream_[c] & 0x02;
|
||||
pixel_pointer_[3] = auxiliary_stream_[c] & 0x04;
|
||||
pixel_pointer_[4] = auxiliary_stream_[c] & 0x08;
|
||||
pixel_pointer_[5] = auxiliary_stream_[c] & 0x10;
|
||||
pixel_pointer_[6] = auxiliary_stream_[c] & 0x20;
|
||||
pixel_pointer_[7] = auxiliary_stream_[c] & 0x40;
|
||||
pixel_pointer_[8] = base_stream_[c] & 0x01;
|
||||
pixel_pointer_[9] = base_stream_[c] & 0x02;
|
||||
pixel_pointer_[10] = base_stream_[c] & 0x04;
|
||||
pixel_pointer_[11] = base_stream_[c] & 0x08;
|
||||
pixel_pointer_[12] = base_stream_[c] & 0x10;
|
||||
pixel_pointer_[13] = base_stream_[c] & 0x20;
|
||||
graphics_carry_ = base_stream_[c] & 0x40;
|
||||
pixel_pointer_ += 14;
|
||||
}
|
||||
} break;
|
||||
case GraphicsMode::DoubleHighRes:
|
||||
pixel_pointer_ = output_double_high_resolution(
|
||||
pixel_pointer_,
|
||||
&base_stream_[static_cast<size_t>(column_)],
|
||||
&auxiliary_stream_[static_cast<size_t>(column_)],
|
||||
static_cast<size_t>(pixel_end - column_));
|
||||
break;
|
||||
}
|
||||
|
||||
if(ending_column >= 40) {
|
||||
@ -588,7 +508,6 @@ template <class BusHandler, bool is_iie> class Video: public VideoBase {
|
||||
static_cast<uint16_t>(((video_page()+1) * 0x400) + row_address);
|
||||
}
|
||||
|
||||
static const int flash_length = 8406;
|
||||
BusHandler &bus_handler_;
|
||||
void output_data_to_column(int column) {
|
||||
int length = column - pixel_pointer_column_;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user