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110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
//
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// Video.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/04/2018.
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// Copyright © 2018 Thomas Harte. All rights reserved.
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//
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#include "Video.hpp"
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using namespace AppleII::Video;
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namespace {
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struct ScaledByteFiller {
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ScaledByteFiller() {
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VideoBase::setup_tables();
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}
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} throwaway;
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}
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VideoBase::VideoBase() :
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crt_(new Outputs::CRT::CRT(455, 1, Outputs::CRT::DisplayType::NTSC60, 1)) {
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// Set a composite sampling function that assumes 1bpp input, and uses just 7 bits per byte.
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crt_->set_composite_sampling_function(
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"float composite_sample(usampler2D sampler, vec2 coordinate, vec2 icoordinate, float phase, float amplitude)"
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"{"
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"uint texValue = texture(sampler, coordinate).r;"
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"texValue <<= uint(icoordinate.x * 7.0) % 7u;"
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"return float(texValue & 64u);"
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"}");
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// TODO: the above has precision issues. Fix!
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// Show only the centre 75% of the TV frame.
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crt_->set_video_signal(Outputs::CRT::VideoSignal::Composite);
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crt_->set_visible_area(Outputs::CRT::Rect(0.115f, 0.117f, 0.77f, 0.77f));
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}
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Outputs::CRT::CRT *VideoBase::get_crt() {
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return crt_.get();
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}
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uint16_t VideoBase::scaled_byte[256];
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uint16_t VideoBase::low_resolution_patterns[2][16];
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void VideoBase::setup_tables() {
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for(int c = 0; c < 128; ++c) {
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const uint16_t value =
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((c & 0x01) ? 0x0003 : 0x0000) |
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((c & 0x02) ? 0x000c : 0x0000) |
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((c & 0x04) ? 0x0030 : 0x0000) |
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((c & 0x08) ? 0x0140 : 0x0000) |
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((c & 0x10) ? 0x0600 : 0x0000) |
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((c & 0x20) ? 0x1800 : 0x0000) |
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((c & 0x40) ? 0x6000 : 0x0000);
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uint8_t *const table_entry = reinterpret_cast<uint8_t *>(&scaled_byte[c]);
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table_entry[1] = static_cast<uint8_t>(value & 0xff);
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table_entry[0] = static_cast<uint8_t>(value >> 8);
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}
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for(int c = 128; c < 256; ++c) {
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uint8_t *const source_table_entry = reinterpret_cast<uint8_t *>(&scaled_byte[c & 0x7f]);
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uint8_t *const destination_table_entry = reinterpret_cast<uint8_t *>(&scaled_byte[c]);
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destination_table_entry[0] = static_cast<uint8_t>(source_table_entry[0] >> 1);
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destination_table_entry[1] = static_cast<uint8_t>((source_table_entry[1] >> 1) | ((source_table_entry[0]&1) << 6));
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}
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for(int c = 0; c < 16; ++c) {
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uint8_t *table_entry = reinterpret_cast<uint8_t *>(&low_resolution_patterns[0][c]);
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table_entry[1] = static_cast<uint8_t>(c | (c << 4));
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table_entry[0] = static_cast<uint8_t>((c >> 3) | (c << 1) | (c << 5));
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table_entry = reinterpret_cast<uint8_t *>(&low_resolution_patterns[1][c]);
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table_entry[1] = static_cast<uint8_t>((c >> 2) | (c << 2) | (c << 6));
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table_entry[0] = static_cast<uint8_t>((c >> 1) | (c << 3));
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}
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}
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void VideoBase::set_graphics_mode() {
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use_graphics_mode_ = true;
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}
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void VideoBase::set_text_mode() {
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use_graphics_mode_ = false;
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}
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void VideoBase::set_mixed_mode(bool mixed_mode) {
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mixed_mode_ = mixed_mode;
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}
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void VideoBase::set_video_page(int page) {
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video_page_ = page;
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}
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void VideoBase::set_low_resolution() {
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graphics_mode_ = GraphicsMode::LowRes;
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}
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void VideoBase::set_high_resolution() {
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graphics_mode_ = GraphicsMode::HighRes;
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}
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void VideoBase::set_character_rom(const std::vector<uint8_t> &character_rom) {
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character_rom_ = character_rom;
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}
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