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132 lines
3.4 KiB
C++
132 lines
3.4 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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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::Scan:
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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 mat3 lumaChromaToRGB;"
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"uniform mat3 rgbToLumaChroma;"
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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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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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"in vec2 startPoint;"
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"in vec2 endPoint;";
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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::Scan:
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return
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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) / textureSize(textureName, 0);"
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"vec2 eyePosition = vec2(mix(startPoint.x, endPoint.x, lateral), lineY + longitudinal) / vec2(scale.x, 2048.0);"
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"gl_Position = vec4(eyePosition*2 - vec2(1.0), 0.0, 1.0);"
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"}";
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case ShaderType::Line:
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return
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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, endPoint, lateral) / scale;"
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"vec2 height = normalize(endPoint - startPoint).yx * (longitudinal - 0.5) * rowHeight;"
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"vec2 eyePosition = vec2(-0.9, 0.9) + vec2(1.8, -1.8) * (centrePoint + height);"
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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::Scan:
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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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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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break;
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}
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}
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