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76 lines
2.0 KiB
C++
76 lines
2.0 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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VideoBase::VideoBase() :
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crt_(new Outputs::CRT::CRT(910, 1, Outputs::CRT::DisplayType::NTSC60, 1)) {
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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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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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"return texture(sampler, coordinate).r;"
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"}");
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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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crt_->set_immediate_default_phase(0.0f);
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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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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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// Bytes in the character ROM are stored in reverse bit order. Reverse them
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// ahead of time so as to be able to use the same scaling table as for
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// high-resolution graphics.
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for(auto &byte : character_rom_) {
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byte =
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((byte & 0x40) ? 0x01 : 0x00) |
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((byte & 0x20) ? 0x02 : 0x00) |
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((byte & 0x10) ? 0x04 : 0x00) |
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((byte & 0x08) ? 0x08 : 0x00) |
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((byte & 0x04) ? 0x10 : 0x00) |
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((byte & 0x02) ? 0x20 : 0x00) |
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((byte & 0x01) ? 0x40 : 0x00) |
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(byte & 0x80);
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}
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}
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