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685 lines
23 KiB
C++
685 lines
23 KiB
C++
//
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// ScanTargetVertexArrayAttributs.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 11/11/2018.
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// Copyright © 2018 Thomas Harte. All rights reserved.
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//
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#include "ScanTarget.hpp"
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#include <cmath>
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#ifndef M_PI
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#define M_PI 3.1415926f
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#endif
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using namespace Outputs::Display::OpenGL;
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// MARK: - State setup for compiled shaders.
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void ScanTarget::set_uniforms(ShaderType type, Shader &target) const {
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// Slightly over-amping rowHeight here is a cheap way to make sure that lines
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// converge even allowing for the fact that they may not be spaced by exactly
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// the expected distance. Cf. the stencil-powered logic for making sure all
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// pixels are painted only exactly once per field.
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const auto modals = BufferingScanTarget::modals();
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switch(type) {
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case ShaderType::Composition: break;
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default:
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target.set_uniform("rowHeight", GLfloat(1.05f / modals.expected_vertical_lines));
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target.set_uniform("scale", GLfloat(modals.output_scale.x), GLfloat(modals.output_scale.y) * modals.aspect_ratio * (3.0f / 4.0f));
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target.set_uniform("phaseOffset", GLfloat(modals.input_data_tweaks.phase_linked_luminance_offset));
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const float clocks_per_angle = float(modals.cycles_per_line) * float(modals.colour_cycle_denominator) / float(modals.colour_cycle_numerator);
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GLfloat texture_offsets[4];
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GLfloat angles[4];
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for(int c = 0; c < 4; ++c) {
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GLfloat angle = (GLfloat(c) - 1.5f) / 4.0f;
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texture_offsets[c] = angle * clocks_per_angle;
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angles[c] = GLfloat(angle * 2.0f * M_PI);
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}
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target.set_uniform("textureCoordinateOffsets", 1, 4, texture_offsets);
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target.set_uniform("compositeAngleOffsets", 4, 1, angles);
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switch(modals.composite_colour_space) {
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case ColourSpace::YIQ: {
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const GLfloat rgbToYIQ[] = {0.299f, 0.596f, 0.211f, 0.587f, -0.274f, -0.523f, 0.114f, -0.322f, 0.312f};
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const GLfloat yiqToRGB[] = {1.0f, 1.0f, 1.0f, 0.956f, -0.272f, -1.106f, 0.621f, -0.647f, 1.703f};
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target.set_uniform_matrix("lumaChromaToRGB", 3, false, yiqToRGB);
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target.set_uniform_matrix("rgbToLumaChroma", 3, false, rgbToYIQ);
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} break;
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case ColourSpace::YUV: {
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const GLfloat rgbToYUV[] = {0.299f, -0.14713f, 0.615f, 0.587f, -0.28886f, -0.51499f, 0.114f, 0.436f, -0.10001f};
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const GLfloat yuvToRGB[] = {1.0f, 1.0f, 1.0f, 0.0f, -0.39465f, 2.03211f, 1.13983f, -0.58060f, 0.0f};
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target.set_uniform_matrix("lumaChromaToRGB", 3, false, yuvToRGB);
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target.set_uniform_matrix("rgbToLumaChroma", 3, false, rgbToYUV);
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} break;
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}
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break;
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}
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}
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void ScanTarget::set_sampling_window(int output_width, int, Shader &target) {
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const auto modals = BufferingScanTarget::modals();
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if(modals.display_type != DisplayType::CompositeColour) {
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const float one_pixel_width = float(modals.cycles_per_line) * modals.visible_area.size.width / float(output_width);
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const float clocks_per_angle = float(modals.cycles_per_line) * float(modals.colour_cycle_denominator) / float(modals.colour_cycle_numerator);
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GLfloat texture_offsets[4];
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GLfloat angles[4];
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for(int c = 0; c < 4; ++c) {
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texture_offsets[c] = 1.0f * (((one_pixel_width * float(c)) / 3.0f) - (one_pixel_width * 0.5f));
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angles[c] = GLfloat((texture_offsets[c] / clocks_per_angle) * 2.0f * M_PI);
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}
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target.set_uniform("textureCoordinateOffsets", 1, 4, texture_offsets);
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target.set_uniform("compositeAngleOffsets", 4, 1, angles);
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}
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}
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void ScanTarget::enable_vertex_attributes(ShaderType type, Shader &target) {
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#define rt_offset_of(field, source) (reinterpret_cast<uint8_t *>(&source.field) - reinterpret_cast<uint8_t *>(&source))
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// test_scan and test_line are here so that the byte offsets that need to be
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// calculated inside a loop can be done so validly; offsetof requires constant arguments.
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Scan test_scan;
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Line test_line;
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// Some GPUs require alignment and will need to copy vertex data to a
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// shadow buffer otherwise
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static_assert(sizeof(Scan) % 4 == 0);
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static_assert(sizeof(Line) % 4 == 0);
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switch(type) {
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case ShaderType::Composition:
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for(int c = 0; c < 2; ++c) {
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const std::string prefix = c ? "end" : "start";
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target.enable_vertex_attribute_with_pointer(
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prefix + "DataX",
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1, GL_UNSIGNED_SHORT, GL_FALSE,
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sizeof(Scan),
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reinterpret_cast<void *>(rt_offset_of(scan.end_points[c].data_offset, test_scan)),
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1);
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target.enable_vertex_attribute_with_pointer(
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prefix + "Clock",
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1, GL_UNSIGNED_SHORT, GL_FALSE,
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sizeof(Scan),
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reinterpret_cast<void *>(rt_offset_of(scan.end_points[c].cycles_since_end_of_horizontal_retrace, test_scan)),
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1);
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}
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target.enable_vertex_attribute_with_pointer(
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"dataY",
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1, GL_UNSIGNED_SHORT, GL_FALSE,
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sizeof(Scan),
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reinterpret_cast<void *>(offsetof(Scan, data_y)),
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1);
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target.enable_vertex_attribute_with_pointer(
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"lineY",
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1, GL_UNSIGNED_SHORT, GL_FALSE,
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sizeof(Scan),
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reinterpret_cast<void *>(offsetof(Scan, line)),
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1);
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break;
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default:
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for(int c = 0; c < 2; ++c) {
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const std::string prefix = c ? "end" : "start";
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if(type == ShaderType::Conversion) {
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target.enable_vertex_attribute_with_pointer(
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prefix + "Point",
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2, GL_UNSIGNED_SHORT, GL_FALSE,
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sizeof(Line),
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reinterpret_cast<void *>(rt_offset_of(end_points[c].x, test_line)),
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1);
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}
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target.enable_vertex_attribute_with_pointer(
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prefix + "Clock",
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1, GL_UNSIGNED_SHORT, GL_FALSE,
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sizeof(Line),
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reinterpret_cast<void *>(rt_offset_of(end_points[c].cycles_since_end_of_horizontal_retrace, test_line)),
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1);
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target.enable_vertex_attribute_with_pointer(
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prefix + "CompositeAngle",
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1, GL_SHORT, GL_FALSE,
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sizeof(Line),
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reinterpret_cast<void *>(rt_offset_of(end_points[c].composite_angle, test_line)),
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1);
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}
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target.enable_vertex_attribute_with_pointer(
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"lineY",
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1, GL_UNSIGNED_SHORT, GL_FALSE,
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sizeof(Line),
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reinterpret_cast<void *>(offsetof(Line, line)),
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1);
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target.enable_vertex_attribute_with_pointer(
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"lineCompositeAmplitude",
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1, GL_UNSIGNED_BYTE, GL_FALSE,
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sizeof(Line),
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reinterpret_cast<void *>(offsetof(Line, composite_amplitude)),
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1);
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break;
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}
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#undef rt_offset_of
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}
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std::vector<std::string> ScanTarget::bindings(ShaderType type) const {
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switch(type) {
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case ShaderType::Composition: return {
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"startDataX",
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"startClock",
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"endDataX",
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"endClock",
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"dataY",
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"lineY"
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};
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default: return {
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"startPoint",
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"endPoint",
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"startClock",
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"endClock",
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"lineY",
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"lineCompositeAmplitude",
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"startCompositeAngle",
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"endCompositeAngle"
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};
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}
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}
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// MARK: - Shader code.
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std::string ScanTarget::sampling_function() const {
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std::string fragment_shader;
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const auto modals = BufferingScanTarget::modals();
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const bool is_svideo = modals.display_type == DisplayType::SVideo;
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if(is_svideo) {
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fragment_shader +=
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"vec2 svideo_sample(vec2 coordinate, float angle) {";
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} else {
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fragment_shader +=
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"float composite_sample(vec2 coordinate, float angle) {";
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}
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switch(modals.input_data_type) {
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case InputDataType::Luminance1:
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case InputDataType::Luminance8:
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// Easy, just copy across.
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fragment_shader +=
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is_svideo ?
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"return vec2(textureLod(textureName, coordinate, 0).r, 0.0);" :
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"return textureLod(textureName, coordinate, 0).r;";
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break;
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case InputDataType::PhaseLinkedLuminance8:
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fragment_shader +=
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"uint iPhase = uint(step(sign(angle), 0.0) * 3) ^ uint(abs(angle * 2.0 / 3.141592654) ) & 3u;";
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fragment_shader +=
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is_svideo ?
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"return vec2(textureLod(textureName, coordinate, 0)[iPhase], 0.0);" :
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"return textureLod(textureName, coordinate, 0)[iPhase];";
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break;
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case InputDataType::Luminance8Phase8:
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fragment_shader +=
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"vec2 yc = textureLod(textureName, coordinate, 0).rg;"
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"float phaseOffset = 3.141592654 * 2.0 * 2.0 * yc.y;"
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"float rawChroma = step(yc.y, 0.75) * cos(angle + phaseOffset);";
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fragment_shader +=
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is_svideo ?
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"return vec2(yc.x, rawChroma);" :
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"return mix(yc.x, rawChroma, compositeAmplitude);";
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break;
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case InputDataType::Red1Green1Blue1:
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case InputDataType::Red2Green2Blue2:
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case InputDataType::Red4Green4Blue4:
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case InputDataType::Red8Green8Blue8:
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fragment_shader +=
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"vec3 colour = rgbToLumaChroma * textureLod(textureName, coordinate, 0).rgb;"
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"vec2 quadrature = vec2(cos(angle), sin(angle));";
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fragment_shader +=
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is_svideo ?
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"return vec2(colour.r, dot(quadrature, colour.gb));" :
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"return mix(colour.r, dot(quadrature, colour.gb), compositeAmplitude);";
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break;
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}
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fragment_shader += "}";
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return fragment_shader;
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}
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std::unique_ptr<Shader> ScanTarget::conversion_shader() const {
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const auto modals = BufferingScanTarget::modals();
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// Compose a vertex shader. If the display type is RGB, generate just the proper
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// geometry position, plus a solitary textureCoordinate.
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//
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// If the display type is anything other than RGB, also produce composite
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// angle and 1/composite amplitude as outputs.
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//
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// If the display type is composite colour, generate four textureCoordinates,
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// spanning a range of -135, -45, +45, +135 degrees.
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//
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// If the display type is S-Video, generate three textureCoordinates, at
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// -45, 0, +45.
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std::string vertex_shader =
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"#version 150\n"
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"uniform vec2 scale;"
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"uniform float rowHeight;"
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"in vec2 startPoint;"
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"in vec2 endPoint;"
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"in float startClock;"
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"in float startCompositeAngle;"
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"in float endClock;"
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"in float endCompositeAngle;"
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"in float lineY;"
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"in float lineCompositeAmplitude;"
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"uniform sampler2D textureName;"
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"uniform sampler2D qamTextureName;"
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"uniform vec2 origin;"
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"uniform vec2 size;"
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"uniform float textureCoordinateOffsets[4];"
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"out vec2 textureCoordinates[4];";
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std::string fragment_shader =
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"#version 150\n"
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"uniform sampler2D textureName;"
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"uniform sampler2D qamTextureName;"
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"in vec2 textureCoordinates[4];"
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"out vec4 fragColour;";
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if(modals.display_type != DisplayType::RGB) {
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vertex_shader +=
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"out float compositeAngle;"
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"out float compositeAmplitude;"
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"out float oneOverCompositeAmplitude;"
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"uniform float angleOffsets[4];";
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fragment_shader +=
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"in float compositeAngle;"
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"in float compositeAmplitude;"
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"in float oneOverCompositeAmplitude;"
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"uniform vec4 compositeAngleOffsets;";
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}
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if(modals.display_type == DisplayType::SVideo || modals.display_type == DisplayType::CompositeColour) {
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vertex_shader += "out vec2 qamTextureCoordinates[4];";
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fragment_shader += "in vec2 qamTextureCoordinates[4];";
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}
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// Add the code to generate a proper output position; this applies to all display types.
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vertex_shader +=
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"void main(void) {"
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"float lateral = float(gl_VertexID & 1);"
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"float longitudinal = float((gl_VertexID & 2) >> 1);"
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"vec2 centrePoint = mix(startPoint, vec2(endPoint.x, startPoint.y), lateral) / scale;"
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"vec2 height = normalize(vec2(endPoint.x, startPoint.y) - startPoint).yx * (longitudinal - 0.5) * rowHeight;"
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"vec2 eyePosition = vec2(-1.0, 1.0) + vec2(2.0, -2.0) * (((centrePoint + height) - origin) / size);"
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"gl_Position = vec4(eyePosition, 0.0, 1.0);";
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// For everything other than RGB, calculate the two composite outputs.
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if(modals.display_type != DisplayType::RGB) {
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vertex_shader +=
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"compositeAngle = (mix(startCompositeAngle, endCompositeAngle, lateral) / 32.0) * 3.141592654;"
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"compositeAmplitude = lineCompositeAmplitude / 255.0;"
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"oneOverCompositeAmplitude = mix(0.0, 255.0 / lineCompositeAmplitude, step(0.95, lineCompositeAmplitude));";
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}
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vertex_shader +=
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"float centreClock = mix(startClock, endClock, lateral);"
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"textureCoordinates[0] = vec2(centreClock + textureCoordinateOffsets[0], lineY + 0.5) / textureSize(textureName, 0);"
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"textureCoordinates[1] = vec2(centreClock + textureCoordinateOffsets[1], lineY + 0.5) / textureSize(textureName, 0);"
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"textureCoordinates[2] = vec2(centreClock + textureCoordinateOffsets[2], lineY + 0.5) / textureSize(textureName, 0);"
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"textureCoordinates[3] = vec2(centreClock + textureCoordinateOffsets[3], lineY + 0.5) / textureSize(textureName, 0);";
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if((modals.display_type == DisplayType::SVideo) || (modals.display_type == DisplayType::CompositeColour)) {
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vertex_shader +=
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"float centreCompositeAngle = abs(mix(startCompositeAngle, endCompositeAngle, lateral)) * 4.0 / 64.0;"
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"centreCompositeAngle = floor(centreCompositeAngle);"
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"qamTextureCoordinates[0] = vec2(centreCompositeAngle - 1.5, lineY + 0.5) / textureSize(textureName, 0);"
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"qamTextureCoordinates[1] = vec2(centreCompositeAngle - 0.5, lineY + 0.5) / textureSize(textureName, 0);"
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"qamTextureCoordinates[2] = vec2(centreCompositeAngle + 0.5, lineY + 0.5) / textureSize(textureName, 0);"
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"qamTextureCoordinates[3] = vec2(centreCompositeAngle + 1.5, lineY + 0.5) / textureSize(textureName, 0);";
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}
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vertex_shader += "}";
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// Compose a fragment shader.
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if(modals.display_type != DisplayType::RGB) {
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fragment_shader +=
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"uniform mat3 lumaChromaToRGB;"
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"uniform mat3 rgbToLumaChroma;";
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fragment_shader += sampling_function();
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}
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fragment_shader +=
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"void main(void) {"
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"vec3 fragColour3;";
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switch(modals.display_type) {
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case DisplayType::CompositeColour:
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fragment_shader += R"x(
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vec4 angles = compositeAngle + compositeAngleOffsets;
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// Sample four times over, at proper angle offsets.
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vec4 samples = vec4(
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composite_sample(textureCoordinates[0], angles.x),
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composite_sample(textureCoordinates[1], angles.y),
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composite_sample(textureCoordinates[2], angles.z),
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composite_sample(textureCoordinates[3], angles.w)
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);
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// The outer structure of the OpenGL scan target means in practice that
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// compositeAmplitude will be the same value across a piece of
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// geometry. I am therefore optimistic that this conditional will not
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// cause a divergence in fragment execution.
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if(compositeAmplitude < 0.01) {
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// Compute only a luminance for use if there's no colour information.
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fragColour3 = vec3(dot(samples, vec4(0.15, 0.35, 0.35, 0.15)));
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} else {
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// Take the average to calculate luminance, then subtract that from all four samples to
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// give chrominance.
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float luminance = dot(samples, vec4(0.25));
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// Split and average chrominance.
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vec2 chrominances[4] = vec2[4](
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textureLod(qamTextureName, qamTextureCoordinates[0], 0).gb,
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textureLod(qamTextureName, qamTextureCoordinates[1], 0).gb,
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textureLod(qamTextureName, qamTextureCoordinates[2], 0).gb,
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textureLod(qamTextureName, qamTextureCoordinates[3], 0).gb
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);
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vec2 channels = (chrominances[0] + chrominances[1] + chrominances[2] + chrominances[3])*0.5 - vec2(1.0);
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// Apply a colour space conversion to get RGB.
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fragColour3 = lumaChromaToRGB * vec3(luminance / (1.0 - compositeAmplitude), channels);
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}
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)x";
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break;
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case DisplayType::CompositeMonochrome:
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fragment_shader +=
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"vec4 angles = compositeAngle + compositeAngleOffsets;"
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"vec4 samples = vec4("
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"composite_sample(textureCoordinates[0], angles.x),"
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"composite_sample(textureCoordinates[1], angles.y),"
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"composite_sample(textureCoordinates[2], angles.z),"
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"composite_sample(textureCoordinates[3], angles.w)"
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");"
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"fragColour3 = vec3(dot(samples, vec4(0.15, 0.35, 0.35, 0.25)));";
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break;
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case DisplayType::RGB:
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fragment_shader +=
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"vec3 samples[4] = vec3[4]("
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"textureLod(textureName, textureCoordinates[0], 0).rgb,"
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"textureLod(textureName, textureCoordinates[1], 0).rgb,"
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"textureLod(textureName, textureCoordinates[2], 0).rgb,"
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"textureLod(textureName, textureCoordinates[3], 0).rgb"
|
|
");"
|
|
"fragColour3 = samples[0]*0.15 + samples[1]*0.35 + samples[2]*0.35 + samples[2]*0.15;";
|
|
break;
|
|
|
|
case DisplayType::SVideo:
|
|
fragment_shader +=
|
|
// Sample the S-Video stream to obtain luminance.
|
|
"vec4 angles = compositeAngle + compositeAngleOffsets;"
|
|
"vec4 samples = vec4("
|
|
"svideo_sample(textureCoordinates[0], angles.x).x,"
|
|
"svideo_sample(textureCoordinates[1], angles.y).x,"
|
|
"svideo_sample(textureCoordinates[2], angles.z).x,"
|
|
"svideo_sample(textureCoordinates[3], angles.w).x"
|
|
");"
|
|
"float luminance = dot(samples, vec4(0.15, 0.35, 0.35, 0.25));"
|
|
|
|
// Split and average chrominaxnce.
|
|
"vec2 chrominances[4] = vec2[4]("
|
|
"textureLod(qamTextureName, qamTextureCoordinates[0], 0).gb,"
|
|
"textureLod(qamTextureName, qamTextureCoordinates[1], 0).gb,"
|
|
"textureLod(qamTextureName, qamTextureCoordinates[2], 0).gb,"
|
|
"textureLod(qamTextureName, qamTextureCoordinates[3], 0).gb"
|
|
");"
|
|
"vec2 channels = (chrominances[0] + chrominances[1] + chrominances[2] + chrominances[3])*0.5 - vec2(1.0);"
|
|
|
|
// Apply a colour space conversion to get RGB.
|
|
"fragColour3 = lumaChromaToRGB * vec3(luminance, channels);";
|
|
break;
|
|
}
|
|
|
|
// Apply a brightness adjustment if requested.
|
|
if(fabs(modals.brightness - 1.0f) > 0.05f) {
|
|
fragment_shader += "fragColour3 = fragColour3 * " + std::to_string(modals.brightness) + ";";
|
|
}
|
|
|
|
// Apply a gamma correction if required.
|
|
if(fabs(output_gamma_ - modals.intended_gamma) > 0.05f) {
|
|
const float gamma_ratio = output_gamma_ / modals.intended_gamma;
|
|
fragment_shader += "fragColour3 = pow(fragColour3, vec3(" + std::to_string(gamma_ratio) + "));";
|
|
}
|
|
|
|
fragment_shader +=
|
|
"fragColour = vec4(fragColour3, 0.64);"
|
|
"}";
|
|
|
|
return std::make_unique<Shader>(
|
|
vertex_shader,
|
|
fragment_shader,
|
|
bindings(ShaderType::Conversion)
|
|
);
|
|
}
|
|
|
|
std::unique_ptr<Shader> ScanTarget::composition_shader() const {
|
|
const auto modals = BufferingScanTarget::modals();
|
|
const std::string vertex_shader =
|
|
R"x(#version 150
|
|
|
|
in float startDataX;
|
|
in float startClock;
|
|
|
|
in float endDataX;
|
|
in float endClock;
|
|
|
|
in float dataY;
|
|
in float lineY;
|
|
|
|
out vec2 textureCoordinate;
|
|
uniform usampler2D textureName;
|
|
|
|
void main(void) {
|
|
float lateral = float(gl_VertexID & 1);
|
|
float longitudinal = float((gl_VertexID & 2) >> 1);
|
|
|
|
textureCoordinate = vec2(mix(startDataX, endDataX, lateral), dataY + 0.5) / textureSize(textureName, 0);
|
|
vec2 eyePosition = vec2(mix(startClock, endClock, lateral), lineY + longitudinal) / vec2(2048.0, 2048.0);
|
|
gl_Position = vec4(eyePosition*2.0 - vec2(1.0), 0.0, 1.0);
|
|
}
|
|
)x";
|
|
|
|
std::string fragment_shader =
|
|
R"x(#version 150
|
|
|
|
out vec4 fragColour;
|
|
in vec2 textureCoordinate;
|
|
|
|
uniform usampler2D textureName;
|
|
|
|
void main(void) {
|
|
)x";
|
|
|
|
switch(modals.input_data_type) {
|
|
case InputDataType::Luminance1:
|
|
fragment_shader += "fragColour = textureLod(textureName, textureCoordinate, 0).rrrr;";
|
|
break;
|
|
|
|
case InputDataType::Luminance8:
|
|
fragment_shader += "fragColour = textureLod(textureName, textureCoordinate, 0).rrrr / vec4(255.0);";
|
|
break;
|
|
|
|
case InputDataType::PhaseLinkedLuminance8:
|
|
case InputDataType::Luminance8Phase8:
|
|
case InputDataType::Red8Green8Blue8:
|
|
fragment_shader += "fragColour = textureLod(textureName, textureCoordinate, 0) / vec4(255.0);";
|
|
break;
|
|
|
|
case InputDataType::Red1Green1Blue1:
|
|
fragment_shader += "fragColour = vec4(textureLod(textureName, textureCoordinate, 0).rrr & uvec3(4u, 2u, 1u), 1.0);";
|
|
break;
|
|
|
|
case InputDataType::Red2Green2Blue2:
|
|
fragment_shader +=
|
|
"uint textureValue = textureLod(textureName, textureCoordinate, 0).r;"
|
|
"fragColour = vec4(float((textureValue >> 4) & 3u), float((textureValue >> 2) & 3u), float(textureValue & 3u), 3.0) / 3.0;";
|
|
break;
|
|
|
|
case InputDataType::Red4Green4Blue4:
|
|
fragment_shader +=
|
|
"uvec2 textureValue = textureLod(textureName, textureCoordinate, 0).rg;"
|
|
"fragColour = vec4(float(textureValue.r) / 15.0, float(textureValue.g & 240u) / 240.0, float(textureValue.g & 15u) / 15.0, 1.0);";
|
|
break;
|
|
}
|
|
|
|
return std::make_unique<Shader>(
|
|
vertex_shader,
|
|
fragment_shader + "}",
|
|
bindings(ShaderType::Composition)
|
|
);
|
|
}
|
|
|
|
std::unique_ptr<Shader> ScanTarget::qam_separation_shader() const {
|
|
const auto modals = BufferingScanTarget::modals();
|
|
const bool is_svideo = modals.display_type == DisplayType::SVideo;
|
|
|
|
// Sets up texture coordinates to run between startClock and endClock, mapping to
|
|
// coordinates that correlate with four times the absolute value of the composite angle.
|
|
std::string vertex_shader =
|
|
"#version 150\n"
|
|
|
|
"in float startClock;"
|
|
"in float startCompositeAngle;"
|
|
"in float endClock;"
|
|
"in float endCompositeAngle;"
|
|
|
|
"in float lineY;"
|
|
"in float lineCompositeAmplitude;"
|
|
|
|
"uniform sampler2D textureName;"
|
|
"uniform float textureCoordinateOffsets[4];"
|
|
|
|
"out float compositeAngle;"
|
|
"out float compositeAmplitude;"
|
|
"out float oneOverCompositeAmplitude;";
|
|
|
|
std::string fragment_shader =
|
|
"#version 150\n"
|
|
|
|
"uniform sampler2D textureName;"
|
|
"uniform mat3 rgbToLumaChroma;"
|
|
|
|
"in float compositeAngle;"
|
|
"in float compositeAmplitude;"
|
|
"in float oneOverCompositeAmplitude;"
|
|
|
|
"out vec4 fragColour;"
|
|
"uniform vec4 compositeAngleOffsets;";
|
|
|
|
if(is_svideo) {
|
|
vertex_shader += "out vec2 textureCoordinate;";
|
|
fragment_shader += "in vec2 textureCoordinate;";
|
|
} else {
|
|
vertex_shader += "out vec2 textureCoordinates[4];";
|
|
fragment_shader += "in vec2 textureCoordinates[4];";
|
|
}
|
|
|
|
vertex_shader +=
|
|
"void main(void) {"
|
|
"float lateral = float(gl_VertexID & 1);"
|
|
"float longitudinal = float((gl_VertexID & 2) >> 1);"
|
|
"float centreClock = mix(startClock, endClock, lateral);"
|
|
|
|
"compositeAngle = mix(startCompositeAngle, endCompositeAngle, lateral) / 64.0;"
|
|
|
|
"float snappedCompositeAngle = floor(abs(compositeAngle) * 4.0);"
|
|
"vec2 eyePosition = vec2(snappedCompositeAngle, lineY + longitudinal) / vec2(2048.0, 2048.0);"
|
|
"gl_Position = vec4(eyePosition*2.0 - vec2(1.0), 0.0, 1.0);"
|
|
|
|
"compositeAngle = compositeAngle * 2.0 * 3.141592654;"
|
|
"compositeAmplitude = lineCompositeAmplitude / 255.0;"
|
|
"oneOverCompositeAmplitude = mix(0.0, 255.0 / lineCompositeAmplitude, step(0.95, lineCompositeAmplitude));";
|
|
|
|
if(is_svideo) {
|
|
vertex_shader +=
|
|
"textureCoordinate = vec2(centreClock, lineY + 0.5) / textureSize(textureName, 0);";
|
|
} else {
|
|
vertex_shader +=
|
|
"textureCoordinates[0] = vec2(centreClock + textureCoordinateOffsets[0], lineY + 0.5) / textureSize(textureName, 0);"
|
|
"textureCoordinates[1] = vec2(centreClock + textureCoordinateOffsets[1], lineY + 0.5) / textureSize(textureName, 0);"
|
|
"textureCoordinates[2] = vec2(centreClock + textureCoordinateOffsets[2], lineY + 0.5) / textureSize(textureName, 0);"
|
|
"textureCoordinates[3] = vec2(centreClock + textureCoordinateOffsets[3], lineY + 0.5) / textureSize(textureName, 0);";
|
|
}
|
|
|
|
vertex_shader += "}";
|
|
|
|
fragment_shader +=
|
|
sampling_function() +
|
|
"void main(void) {";
|
|
|
|
if(modals.display_type == DisplayType::SVideo) {
|
|
fragment_shader +=
|
|
"fragColour = vec4(svideo_sample(textureCoordinate, compositeAngle).rgg * vec3(1.0, cos(compositeAngle), sin(compositeAngle)), 1.0);";
|
|
} else {
|
|
fragment_shader +=
|
|
"vec4 angles = compositeAngle + compositeAngleOffsets;"
|
|
|
|
// Sample four times over, at proper angle offsets.
|
|
"vec4 samples = vec4("
|
|
"composite_sample(textureCoordinates[0], angles.x),"
|
|
"composite_sample(textureCoordinates[1], angles.y),"
|
|
"composite_sample(textureCoordinates[2], angles.z),"
|
|
"composite_sample(textureCoordinates[3], angles.w)"
|
|
");"
|
|
|
|
// Take the average to calculate luminance, then subtract that from all four samples to
|
|
// give chrominance.
|
|
"float luminance = dot(samples, vec4(0.25));"
|
|
"float chrominance = (dot(samples.yz, vec2(0.5)) - luminance) * oneOverCompositeAmplitude;"
|
|
|
|
// Pack that all up and send it on its way.
|
|
"fragColour = vec4(luminance, vec2(cos(compositeAngle), sin(compositeAngle)) * chrominance, 1.0);";
|
|
};
|
|
|
|
fragment_shader +=
|
|
"fragColour = fragColour*0.5 + vec4(0.5);"
|
|
"}";
|
|
|
|
return std::make_unique<Shader>(
|
|
vertex_shader,
|
|
fragment_shader,
|
|
bindings(ShaderType::QAMSeparation)
|
|
);
|
|
}
|