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556 lines
18 KiB
C++
556 lines
18 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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using namespace Outputs::Display::OpenGL;
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void Outputs::Display::OpenGL::ScanTarget::set_uniforms(ShaderType type, Shader &target) {
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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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switch(type) {
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default: break;
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case ShaderType::Conversion:
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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));
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target.set_uniform("phaseOffset", GLfloat(modals_.input_data_tweaks.phase_linked_luminance_offset));
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break;
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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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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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case ShaderType::Conversion:
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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 + "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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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::unique_ptr<Shader> ScanTarget::composition_shader() const {
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const std::string vertex_shader =
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"#version 150\n"
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"in float startDataX;"
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"in float startClock;"
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"in float endDataX;"
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"in float endClock;"
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"in float dataY;"
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"in float lineY;"
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"out vec2 textureCoordinate;"
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"uniform usampler2D textureName;"
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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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"textureCoordinate = vec2(mix(startDataX, endDataX, lateral), dataY + 0.5) / textureSize(textureName, 0);"
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"vec2 eyePosition = vec2(mix(startClock, endClock, lateral), lineY + longitudinal) / vec2(2048.0, 2048.0);"
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"gl_Position = vec4(eyePosition*2.0 - vec2(1.0), 0.0, 1.0);"
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"}";
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std::string fragment_shader =
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"#version 150\n"
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"out vec4 fragColour;"
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"in vec2 textureCoordinate;"
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"uniform usampler2D textureName;"
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"void main(void) {";
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switch(modals_.input_data_type) {
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case InputDataType::Luminance1:
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fragment_shader += "fragColour = textureLod(textureName, textureCoordinate, 0).rrrr;";
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break;
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case InputDataType::Luminance8:
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fragment_shader += "fragColour = textureLod(textureName, textureCoordinate, 0).rrrr / vec4(255.0);";
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break;
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case InputDataType::PhaseLinkedLuminance8:
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case InputDataType::Luminance8Phase8:
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case InputDataType::Red8Green8Blue8:
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fragment_shader += "fragColour = textureLod(textureName, textureCoordinate, 0) / vec4(255.0);";
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break;
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case InputDataType::Red1Green1Blue1:
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fragment_shader += "fragColour = vec4(textureLod(textureName, textureCoordinate, 0).rrr & uvec3(4u, 2u, 1u), 1.0);";
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break;
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case InputDataType::Red2Green2Blue2:
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fragment_shader +=
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"uint textureValue = textureLod(textureName, textureCoordinate, 0).r;"
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"fragColour = vec4(float((textureValue >> 4) & 3u), float((textureValue >> 2) & 3u), float(textureValue & 3u), 3.0) / 3.0;";
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break;
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case InputDataType::Red4Green4Blue4:
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fragment_shader +=
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"uvec2 textureValue = textureLod(textureName, textureCoordinate, 0).rg;"
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"fragColour = vec4(float(textureValue.r) / 15.0, float(textureValue.g & 240u) / 240.0, float(textureValue.g & 15u) / 15.0, 1.0);";
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break;
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}
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return std::unique_ptr<Shader>(new Shader(
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vertex_shader,
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fragment_shader + "}",
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{
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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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));
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}
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std::unique_ptr<Shader> ScanTarget::conversion_shader() const {
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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 vec2 origin;"
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"uniform vec2 size;";
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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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"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 textureCoordinateOffsets[7];"
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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[2];";
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}
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switch(modals_.display_type){
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case DisplayType::RGB:
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case DisplayType::CompositeMonochrome:
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vertex_shader += "out vec2 textureCoordinate;";
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fragment_shader += "in vec2 textureCoordinate;";
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break;
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case DisplayType::CompositeColour:
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case DisplayType::SVideo:
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vertex_shader +=
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"out vec2 textureCoordinates[7];";
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fragment_shader +=
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"in vec2 textureCoordinates[7];";
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break;
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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(0.01, lineCompositeAmplitude));";
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}
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// For RGB and monochrome composite, generate the single texture coordinate; otherwise generate either three
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// or four depending on the type of decoding to apply.
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switch(modals_.display_type){
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case DisplayType::RGB:
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case DisplayType::CompositeMonochrome:
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vertex_shader +=
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"textureCoordinate = vec2(mix(startClock, endClock, lateral), lineY + 0.5) / textureSize(textureName, 0);";
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break;
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case DisplayType::CompositeColour:
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case DisplayType::SVideo:
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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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"textureCoordinates[4] = vec2(centreClock + textureCoordinateOffsets[4], lineY + 0.5) / textureSize(textureName, 0);"
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"textureCoordinates[5] = vec2(centreClock + textureCoordinateOffsets[5], lineY + 0.5) / textureSize(textureName, 0);"
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"textureCoordinates[6] = vec2(centreClock + textureCoordinateOffsets[6], lineY + 0.5) / textureSize(textureName, 0);";
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break;
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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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}
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if(modals_.display_type == DisplayType::SVideo) {
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fragment_shader +=
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"vec2 svideo_sample(vec2 coordinate, float angle) {";
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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 += "return vec2(textureLod(textureName, coordinate, 0).r, 0.0);";
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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((angle * 2.0 / 3.141592654) ) & 3u;" // + phaseOffset*4.0
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"return vec2(textureLod(textureName, coordinate, 0)[iPhase], 0.0);";
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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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"return vec2(yc.x, rawChroma);";
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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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"return vec2(colour.r, dot(quadrature, colour.gb));";
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break;
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}
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fragment_shader += "}";
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}
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if(modals_.display_type == DisplayType::CompositeMonochrome || modals_.display_type == DisplayType::CompositeColour) {
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fragment_shader +=
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"float composite_sample(vec2 coordinate, float angle) {";
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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 += "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((angle * 2.0 / 3.141592654) ) & 3u;" // + phaseOffset*4.0
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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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"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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"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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}
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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::RGB:
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fragment_shader += "fragColour3 = textureLod(textureName, textureCoordinate, 0).rgb;";
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break;
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case DisplayType::SVideo:
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fragment_shader +=
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// Sample four times over, at proper angle offsets.
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"vec2 samples[4] = vec2[4]("
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"svideo_sample(textureCoordinates[0], angles[0]),"
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"svideo_sample(textureCoordinates[1], angles[1]),"
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"svideo_sample(textureCoordinates[2], angles[2]),"
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"svideo_sample(textureCoordinates[3], angles[3])"
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");"
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"vec4 chrominances = vec4("
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"samples[0].y,"
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"samples[1].y,"
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"samples[2].y,"
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"samples[3].y"
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");"
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// Split and average chrominance.
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"vec2 channels = vec2("
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"dot(cos(angles), chrominances),"
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"dot(sin(angles), chrominances)"
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") * vec2(0.25);"
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// Apply a colour space conversion to get RGB.
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"fragColour3 = lumaChromaToRGB * vec3(samples[1].x, channels);";
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break;
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case DisplayType::CompositeColour:
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fragment_shader +=
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"vec4 angles[2] = vec4[2]("
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"vec4(compositeAngle) + compositeAngleOffsets[0],"
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"vec4(compositeAngle) + compositeAngleOffsets[1]"
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");"
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// Sample four times over, at proper angle offsets.
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"vec4 samples[2] = vec4[2](vec4("
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"composite_sample(textureCoordinates[0], angles[0].x),"
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"composite_sample(textureCoordinates[1], angles[0].y),"
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"composite_sample(textureCoordinates[2], angles[0].z),"
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"composite_sample(textureCoordinates[3], angles[0].w)"
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"), vec4("
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"composite_sample(textureCoordinates[4], angles[1].x),"
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"composite_sample(textureCoordinates[5], angles[1].y),"
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"composite_sample(textureCoordinates[6], angles[1].z),"
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"0.0"
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"));"
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// Compute a luminance for use if there's no colour information, now, before
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// modifying samples.
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"float mono_luminance = dot(vec3(samples[0].zw, samples[1].x), vec3(0.15, 0.7, 0.15));"
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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 luminances[4] = float[4]("
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"dot(samples[0], vec4(0.25)),"
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"dot(vec4(samples[0].yzw, samples[1].x), vec4(0.25)),"
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"dot(vec4(samples[0].zw, samples[1].xy), vec4(0.25)),"
|
|
"dot(vec4(samples[0].w, samples[1].xyz), vec4(0.25))"
|
|
");"
|
|
|
|
// Split and average chrominance.
|
|
"vec4 chrominances = vec4("
|
|
"samples[0].y - luminances[0],"
|
|
"samples[0].z - luminances[1],"
|
|
"samples[0].w - luminances[2],"
|
|
"samples[1].x - luminances[3]"
|
|
");"
|
|
"vec4 chrominance_angles = vec4(angles[0].yzw, angles[1].x);"
|
|
"vec2 channels = vec2("
|
|
"dot(cos(chrominance_angles), chrominances),"
|
|
"dot(sin(chrominance_angles), chrominances)"
|
|
") * vec2(0.125 * oneOverCompositeAmplitude);"
|
|
|
|
// Apply a colour space conversion to get RGB.
|
|
"fragColour3 = mix("
|
|
"lumaChromaToRGB * vec3(luminances[2] / (1.0 - compositeAmplitude), channels),"
|
|
"vec3(mono_luminance),"
|
|
"step(oneOverCompositeAmplitude, 0.01)"
|
|
");";
|
|
break;
|
|
|
|
case DisplayType::CompositeMonochrome:
|
|
fragment_shader += "fragColour3 = vec3(composite_sample(textureCoordinate, compositeAngle));";
|
|
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);"
|
|
"}";
|
|
|
|
const auto shader = new Shader(
|
|
vertex_shader,
|
|
fragment_shader,
|
|
{
|
|
"startPoint",
|
|
"endPoint",
|
|
"startClock",
|
|
"endClock",
|
|
"lineY",
|
|
"lineCompositeAmplitude",
|
|
"startCompositeAngle",
|
|
"endCompositeAngle"
|
|
}
|
|
);
|
|
|
|
// If this isn't an RGB or composite colour shader, set the proper colour space.
|
|
if(modals_.display_type != DisplayType::RGB) {
|
|
const float clocks_per_angle = float(modals_.cycles_per_line) * float(modals_.colour_cycle_denominator) / float(modals_.colour_cycle_numerator);
|
|
GLfloat texture_offsets[7];
|
|
GLfloat angles[8];
|
|
for(int c = 0; c < 7; ++c) {
|
|
GLfloat angle = (GLfloat(c) - 3.5f) / 4.0f;
|
|
texture_offsets[c] = angle * clocks_per_angle;
|
|
angles[c] = GLfloat(angle * 2.0f * M_PI);
|
|
}
|
|
shader->set_uniform("textureCoordinateOffsets", 1, 7, texture_offsets);
|
|
shader->set_uniform("compositeAngleOffsets", 4, 2, angles);
|
|
|
|
switch(modals_.composite_colour_space) {
|
|
case ColourSpace::YIQ: {
|
|
const GLfloat rgbToYIQ[] = {0.299f, 0.596f, 0.211f, 0.587f, -0.274f, -0.523f, 0.114f, -0.322f, 0.312f};
|
|
const GLfloat yiqToRGB[] = {1.0f, 1.0f, 1.0f, 0.956f, -0.272f, -1.106f, 0.621f, -0.647f, 1.703f};
|
|
shader->set_uniform_matrix("lumaChromaToRGB", 3, false, yiqToRGB);
|
|
shader->set_uniform_matrix("rgbToLumaChroma", 3, false, rgbToYIQ);
|
|
} break;
|
|
|
|
case ColourSpace::YUV: {
|
|
const GLfloat rgbToYUV[] = {0.299f, -0.14713f, 0.615f, 0.587f, -0.28886f, -0.51499f, 0.114f, 0.436f, -0.10001f};
|
|
const GLfloat yuvToRGB[] = {1.0f, 1.0f, 1.0f, 0.0f, -0.39465f, 2.03211f, 1.13983f, -0.58060f, 0.0f};
|
|
shader->set_uniform_matrix("lumaChromaToRGB", 3, false, yuvToRGB);
|
|
shader->set_uniform_matrix("rgbToLumaChroma", 3, false, rgbToYUV);
|
|
} break;
|
|
}
|
|
}
|
|
|
|
return std::unique_ptr<Shader>(shader);
|
|
}
|