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352 lines
12 KiB
C++
352 lines
12 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 "../../SignalProcessing/FIRFilter.hpp"
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using namespace Outputs::Display::OpenGL;
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std::string ScanTarget::glsl_globals(ShaderType type) {
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switch(type) {
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case ShaderType::InputScan:
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case ShaderType::ProcessedScan:
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return
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"#version 150\n"
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"uniform vec2 scale;"
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"uniform mat3 lumaChromaToRGB;"
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"uniform mat3 rgbToLumaChroma;"
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"uniform float rowHeight;"
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"uniform float processingWidth;"
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"in vec2 startPoint;"
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"in float startDataX;"
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"in float startCompositeAngle;"
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"in vec2 endPoint;"
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"in float endDataX;"
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"in float endCompositeAngle;"
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"in float dataY;"
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"in float lineY;"
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"in float compositeAmplitude;"
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"uniform usampler2D textureName;";
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case ShaderType::Line:
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return
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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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"uniform float processingWidth;"
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"in vec2 startPoint;"
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"in vec2 endPoint;"
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"in float lineY;"
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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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}
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}
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std::vector<Shader::AttributeBinding> ScanTarget::attribute_bindings(ShaderType type) {
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switch(type) {
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case ShaderType::InputScan:
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case ShaderType::ProcessedScan:
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return {
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{"startPoint", 0},
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{"startDataX", 1},
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{"startCompositeAngle", 2},
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{"endPoint", 3},
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{"endDataX", 4},
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{"endCompositeAngle", 5},
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{"dataY", 6},
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{"lineY", 7},
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{"compositeAmplitude", 8},
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};
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case ShaderType::Line:
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return {
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{"startPoint", 0},
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{"endPoint", 1},
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{"lineY", 2},
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};
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}
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}
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std::string ScanTarget::glsl_default_vertex_shader(ShaderType type) {
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switch(type) {
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case ShaderType::InputScan:
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case ShaderType::ProcessedScan: {
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std::string result;
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if(type == ShaderType::InputScan) {
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result += "out vec2 textureCoordinate;";
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} else {
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result += "out vec2 textureCoordinates[11];";
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}
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result +=
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"out float compositeAngle;"
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"out float compositeAmplitudeOut;"
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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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"compositeAngle = (mix(startCompositeAngle, endCompositeAngle, lateral) / 32.0) * 3.141592654;"
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"compositeAmplitudeOut = compositeAmplitude / 255.0;";
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if(type == ShaderType::InputScan) {
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result +=
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"textureCoordinate = vec2(mix(startDataX, endDataX, lateral), dataY + 0.5) / textureSize(textureName, 0);"
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"vec2 eyePosition = vec2(mix(startPoint.x, endPoint.x, lateral) * processingWidth, lineY + longitudinal) / vec2(scale.x, 2048.0);";
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} else {
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result +=
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"vec2 sourcePosition = vec2(mix(startPoint.x, endPoint.x, lateral) * processingWidth, lineY + 0.5);"
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"vec2 eyePosition = (sourcePosition + vec2(0.0, longitudinal - 0.5)) / vec2(scale.x, 2048.0);"
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"sourcePosition /= vec2(scale.x, 2048.0);"
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"textureCoordinates[0] = sourcePosition + vec2(-5.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[1] = sourcePosition + vec2(-4.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[2] = sourcePosition + vec2(-3.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[3] = sourcePosition + vec2(-2.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[4] = sourcePosition + vec2(-1.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[5] = sourcePosition;"
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"textureCoordinates[6] = sourcePosition + vec2(1.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[7] = sourcePosition + vec2(2.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[8] = sourcePosition + vec2(3.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[9] = sourcePosition + vec2(4.0, 0.0) / textureSize(textureName, 0);"
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"textureCoordinates[10] = sourcePosition + vec2(5.0, 0.0) / textureSize(textureName, 0);"
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"eyePosition = eyePosition;";
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}
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return result +
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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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}
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case ShaderType::Line:
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return
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"out vec2 textureCoordinate;"
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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(lateral * processingWidth, lineY + 0.5) / vec2(1.0, textureSize(textureName, 0).y);"
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"vec2 centrePoint = mix(startPoint, endPoint, lateral) / scale;"
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"vec2 height = normalize(endPoint - 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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"}";
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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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switch(type) {
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case ShaderType::InputScan:
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case ShaderType::ProcessedScan:
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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(Scan),
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reinterpret_cast<void *>(offsetof(Scan, scan.end_points[c].x)),
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1);
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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 *>(offsetof(Scan, scan.end_points[c].data_offset)),
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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_UNSIGNED_SHORT, GL_FALSE,
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sizeof(Scan),
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reinterpret_cast<void *>(offsetof(Scan, scan.end_points[c].composite_angle)),
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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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target.enable_vertex_attribute_with_pointer(
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"compositeAmplitude",
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1, GL_UNSIGNED_BYTE, GL_FALSE,
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sizeof(Scan),
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reinterpret_cast<void *>(offsetof(Scan, scan.composite_amplitude)),
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1);
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break;
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case ShaderType::Line:
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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 *>(offsetof(Line, end_points[c].x)),
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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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break;
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}
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}
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std::unique_ptr<Shader> ScanTarget::input_shader(InputDataType input_data_type, DisplayType display_type) {
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std::string fragment_shader =
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"#version 150\n"
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"out vec3 fragColour;"
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"in vec2 textureCoordinate;"
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"in float compositeAngle;"
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"in float compositeAmplitudeOut;"
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"uniform mat3 lumaChromaToRGB;"
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"uniform mat3 rgbToLumaChroma;"
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"uniform usampler2D textureName;"
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"void main(void) {";
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DisplayType computed_display_type;
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switch(input_data_type) {
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case InputDataType::Luminance1:
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computed_display_type = DisplayType::CompositeMonochrome;
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fragment_shader += "fragColour = texture(textureName, textureCoordinate).rrr;";
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break;
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case InputDataType::Luminance8:
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computed_display_type = DisplayType::CompositeMonochrome;
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fragment_shader += "fragColour = vec3(texture(textureName, textureCoordinate).r / 255.0);";
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break;
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case InputDataType::Luminance8Phase8:
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computed_display_type = DisplayType::SVideo;
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fragment_shader +=
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"vec2 yc = texture(textureName, textureCoordinate).rg / vec2(255.0);"
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"float phaseOffset = 3.141592654 * 2.0 * 2.0 * yc.y;"
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"float chroma = step(yc.y, 0.75) * cos(compositeAngle + phaseOffset);"
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"fragColour = vec3(yc.x, chroma, 0.0);";
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break;
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case InputDataType::Red1Green1Blue1:
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computed_display_type = DisplayType::RGB;
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fragment_shader +=
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"uint textureValue = texture(textureName, textureCoordinate).r;"
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"fragColour = uvec3(textureValue) & uvec3(4u, 2u, 1u);";
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break;
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case InputDataType::Red2Green2Blue2:
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computed_display_type = DisplayType::RGB;
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fragment_shader +=
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"uint textureValue = texture(textureName, textureCoordinate).r;"
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"fragColour = vec3(float((textureValue >> 4) & 3u), float((textureValue >> 2) & 3u), float(textureValue & 3u)) / 3.0;";
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break;
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case InputDataType::Red4Green4Blue4:
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computed_display_type = DisplayType::RGB;
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fragment_shader +=
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"uvec2 textureValue = texture(textureName, textureCoordinate).rg;"
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"fragColour = vec3(float(textureValue.r) / 15.0, float(textureValue.g & 240u) / 240.0, float(textureValue.g & 15u) / 15.0);";
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break;
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case InputDataType::Red8Green8Blue8:
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computed_display_type = DisplayType::RGB;
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fragment_shader += "fragColour = texture(textureName, textureCoordinate).rgb / vec3(255.0);";
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break;
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}
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if(computed_display_type != display_type) {
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// If the input type is RGB but the output type isn't then
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// there'll definitely be an RGB to SVideo step.
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if(computed_display_type == DisplayType::RGB) {
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fragment_shader +=
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"vec3 composite_colour = rgbToLumaChroma * fragColour;"
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"vec2 quadrature = vec2(cos(compositeAngle), sin(compositeAngle));"
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"fragColour = vec3(composite_colour.r, 0.5 + dot(quadrature, composite_colour.gb)*0.5, 0.0);";
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}
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// If the output type isn't SVideo, add an SVideo to composite step.
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if(display_type != DisplayType::SVideo) {
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fragment_shader += "fragColour = vec3(mix(fragColour.r, 2.0*(fragColour.g - 0.5), compositeAmplitudeOut));";
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}
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}
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return std::unique_ptr<Shader>(new Shader(
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glsl_globals(ShaderType::InputScan) + glsl_default_vertex_shader(ShaderType::InputScan),
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fragment_shader + "}",
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attribute_bindings(ShaderType::InputScan)
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));
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}
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std::unique_ptr<Shader> ScanTarget::svideo_to_rgb_shader(int colour_cycle_numerator, int colour_cycle_denominator, int processing_width) {
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/*
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Composite to S-Video conversion is achieved by filtering the input signal to obtain luminance, and then subtracting that
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from the original to get chrominance.
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(Colour cycle numerator)/(Colour cycle denominator) gives the number of colour cycles in (processing_width / LineBufferWidth),
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there'll be at least four samples per colour clock and in practice at most just a shade more than 9.
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*/
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const float cycles_per_expanded_line = (float(colour_cycle_numerator) / float(colour_cycle_denominator)) / (float(processing_width) / float(LineBufferWidth));
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const SignalProcessing::FIRFilter filter(11, float(LineBufferWidth), 0.0f, cycles_per_expanded_line);
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const auto coefficients = filter.get_coefficients();
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auto shader = std::unique_ptr<Shader>(new Shader(
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glsl_globals(ShaderType::ProcessedScan) + glsl_default_vertex_shader(ShaderType::ProcessedScan),
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"#version 150\n"
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"in vec2 textureCoordinates[11];"
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"uniform float textureWeights[11];"
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"uniform usampler2D textureName;"
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"out vec3 fragColour;"
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"void main(void) {"
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"vec3 textureSample = vec3(texture(textureName, textureCoordinates[5]).rgb) / vec3(65536.0 * 16384.0);"
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"fragColour = textureSample;"
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"}",
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attribute_bindings(ShaderType::ProcessedScan)
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));
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shader->set_uniform("textureWeights", GLint(sizeof(GLfloat)), GLsizei(coefficients.size()), coefficients.data());
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return shader;
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}
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std::unique_ptr<Shader> ScanTarget::composite_to_svideo_shader(int colour_cycle_numerator, int colour_cycle_denominator, int processing_width) {
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const float cycles_per_expanded_line = (float(colour_cycle_numerator) / float(colour_cycle_denominator)) / (float(processing_width) / float(LineBufferWidth));
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const SignalProcessing::FIRFilter filter(11, float(LineBufferWidth), 0.0f, cycles_per_expanded_line * 0.5f);
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const auto coefficients = filter.get_coefficients();
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return nullptr;
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}
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