Add vector display screen type

Source/visualiser/LineFragmentShader.glsl

@@ -7,8 +7,10 @@ std::string lineFragmentShader = R"(
 
 uniform float uSize;
 uniform float uIntensity;
-uniform float uOffset;
-uniform float uScale;
+uniform vec2 uOffset;
+uniform vec2 uScale;
+uniform float uScreenType;
+uniform float uFishEye;
 uniform sampler2D uScreen;
 varying float vSize;
 varying vec4 uvl;
@@ -29,7 +31,15 @@ float erf(float x) {
                
                
 void main() {
-    vec2 texCoord =  (vTexCoord - 0.5) / uScale + 0.5 + uOffset;
+    // fish eye distortion
+    vec2 uv = vTexCoord - vec2(0.5);
+    float uva = atan(uv.x, uv.y);
+    float uvd = sqrt(dot(uv, uv));
+    uvd = uvd * (1.0 - uFishEye * uvd * uvd);
+    vec2 texCoord = vec2(0.5) + vec2(sin(uva), cos(uva)) * uvd;
+    
+    texCoord = (texCoord - uOffset - 0.5) * uScale + 0.5;
+
     float len = uvl.z;
     vec2 xy = uvl.xy;
     float brightness;
@@ -45,6 +55,7 @@ void main() {
     }
 
     brightness *= uvl.w;
+    
     gl_FragColor = 2.0 * texture2D(uScreen, texCoord) * brightness;
     gl_FragColor.a = 1.0;
 }

Source/visualiser/OutputFragmentShader.glsl

@@ -10,6 +10,7 @@ uniform float uNoise;
 uniform float uTime;
 uniform float uGlow;
 uniform float uAmbient;
+uniform float uFishEye;
 uniform float uRealScreen;
 uniform vec2 uOffset;
 uniform vec2 uScale;
@@ -29,11 +30,19 @@ float noise(in vec2 uv, in float time) {
 
 void main() {
     vec2 linePos = (vTexCoordCanvas - 0.5) / uScale + 0.5 + uOffset;
+    
+    // fish eye distortion
+    vec2 uv = linePos - vec2(0.5);
+    float uva = atan(uv.x, uv.y);
+    float uvd = sqrt(dot(uv, uv));
+    uvd = uvd * (1.0 + uFishEye * uvd * uvd);
+    linePos = vec2(0.5) + vec2(sin(uva), cos(uva)) * uvd;
+    
     vec4 line = texture2D(uTexture0, linePos);
     // r components have grid; g components do not.
     vec4 screen = texture2D(uTexture3, vTexCoord);
     vec4 tightGlow = texture2D(uTexture1, linePos);
-    vec4 scatter = texture2D(uTexture2, linePos) + (1.0 - uRealScreen) * max(uAmbient - 0.45, 0.0);
+    vec4 scatter = texture2D(uTexture2, linePos) + (1.0 - uRealScreen) * max(uAmbient - 0.35, 0.0);
     float light = line.r + uGlow * 1.5 * screen.g * screen.g * tightGlow.r;
     light += uGlow * 0.3 * scatter.g * (2.0 + 1.0 * screen.g + 0.5 * screen.r);
     float tlight = 1.0-pow(2.0, -uExposure*light);

Source/visualiser/VisualiserComponent.cpp

@@ -783,10 +783,10 @@ void VisualiserComponent::drawLine(const std::vector<float>& xPoints, const std:
     lineShader->setUniform("uFadeAmount", fadeAmount);
     lineShader->setUniform("uNEdges", (GLfloat) nEdges);
     
-    OsciPoint offset = settings.getScreenType() == ScreenType::Real ? REAL_SCREEN_OFFSET : OsciPoint();
-    OsciPoint scale = settings.getScreenType() == ScreenType::Real ? REAL_SCREEN_SCALE : OsciPoint(1);
-    lineShader->setUniform("uOffset", (float) offset.x, (float) offset.y);
-    lineShader->setUniform("uScale", (float) scale.x, (float) scale.y);
+    lineShader->setUniform("uScreenType", (GLfloat) screenType);
+    lineShader->setUniform("uFishEye", screenType == ScreenType::VectorDisplay ? VECTOR_DISPLAY_FISH_EYE : 0.0f);
+    setOffsetAndScale(lineShader.get());
+    
 
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vertexIndexBuffer);
     int nEdgesThisTime = xPoints.size() - 1;
@@ -860,17 +860,32 @@ void VisualiserComponent::drawCRT() {
     outputShader->setUniform("uTime", time);
     outputShader->setUniform("uGlow", (float) settings.getGlow());
     outputShader->setUniform("uAmbient", (float) settings.getAmbient());
-    OsciPoint offset = settings.getScreenType() == ScreenType::Real ? REAL_SCREEN_OFFSET : OsciPoint();
-    OsciPoint scale = settings.getScreenType() == ScreenType::Real ? REAL_SCREEN_SCALE : OsciPoint(1);
-    outputShader->setUniform("uOffset", (float) offset.x, (float) offset.y);
-    outputShader->setUniform("uScale", (float) scale.x, (float) scale.y);
-    outputShader->setUniform("uRealScreen", settings.getScreenType() == ScreenType::Real ? 1.0f : 0.0f);
+    outputShader->setUniform("uFishEye", screenType == ScreenType::VectorDisplay ? VECTOR_DISPLAY_FISH_EYE : 0.0f);
+    setOffsetAndScale(outputShader.get());
+    outputShader->setUniform("uRealScreen", settings.parameters.screenType->isRealisticDisplay() ? 1.0f : 0.0f);
     outputShader->setUniform("uResizeForCanvas", lineTexture.width / 1024.0f);
     juce::Colour colour = juce::Colour::fromHSV(settings.getHue() / 360.0f, 1.0, 1.0, 1.0);
     outputShader->setUniform("uColour", colour.getFloatRed(), colour.getFloatGreen(), colour.getFloatBlue());
     drawTexture(lineTexture, blur1Texture, blur3Texture, screenTexture);
 }
 
+void VisualiserComponent::setOffsetAndScale(juce::OpenGLShaderProgram* shader) {
+    OsciPoint offset;
+    OsciPoint scale;
+    if (settings.getScreenType() == ScreenType::Real) {
+        offset = REAL_SCREEN_OFFSET;
+        scale = REAL_SCREEN_SCALE;
+    } else if (settings.getScreenType() == ScreenType::VectorDisplay) {
+        offset = VECTOR_DISPLAY_OFFSET;
+        scale = VECTOR_DISPLAY_SCALE;
+    } else {
+        scale = { 1.0f };
+    }
+    shader->setUniform("uOffset", (float) offset.x, (float) offset.y);
+    checkGLErrors("test 4");
+    shader->setUniform("uScale", (float) scale.x, (float) scale.y);
+}
+
 Texture VisualiserComponent::createScreenTexture() {
     using namespace juce::gl;
     
@@ -878,6 +893,8 @@ Texture VisualiserComponent::createScreenTexture() {
         screenOpenGLTexture.loadImage(screenTextureImage);
     } else if (screenType == ScreenType::Real) {
         screenOpenGLTexture.loadImage(oscilloscopeImage);
+    } else if (screenType == ScreenType::VectorDisplay) {
+        screenOpenGLTexture.loadImage(vectorDisplayImage);
     } else {
         screenOpenGLTexture.loadImage(emptyScreenImage);
     }

Source/visualiser/VisualiserComponent.h

@@ -173,10 +173,15 @@ private:
     juce::Image screenTextureImage = juce::ImageFileFormat::loadFrom(BinaryData::noise_jpg, BinaryData::noise_jpgSize);
     juce::Image emptyScreenImage = juce::ImageFileFormat::loadFrom(BinaryData::empty_jpg, BinaryData::empty_jpgSize);
     juce::Image oscilloscopeImage = juce::ImageFileFormat::loadFrom(BinaryData::real_jpg, BinaryData::real_jpgSize);
+    juce::Image vectorDisplayImage = juce::ImageFileFormat::loadFrom(BinaryData::vector_display_jpg, BinaryData::vector_display_jpgSize);
     
     OsciPoint REAL_SCREEN_OFFSET = { 0.02, -0.15 };
     OsciPoint REAL_SCREEN_SCALE = { 0.6 };
     
+    OsciPoint VECTOR_DISPLAY_OFFSET = { 0.075, -0.045 };
+    OsciPoint VECTOR_DISPLAY_SCALE = { 0.6 };
+    float VECTOR_DISPLAY_FISH_EYE = 0.5;
+    
     Texture screenTexture;
     std::optional<Texture> targetTexture = std::nullopt;
     
@@ -198,6 +203,7 @@ private:
     chowdsp::ResamplingTypes::LanczosResampler<2048, 8> yResampler;
     chowdsp::ResamplingTypes::LanczosResampler<2048, 8> zResampler;
     
+    void setOffsetAndScale(juce::OpenGLShaderProgram* shader);
     void initialiseSharedTexture();
     void closeSharedTexture();
     Texture makeTexture(int width, int height);

Source/visualiser/VisualiserSettings.h

@@ -14,12 +14,13 @@ enum class ScreenType : int {
     Graticule = 2,
     Smudged = 3,
     SmudgedGraticule = 4,
-    Real = 5
+    Real = 5,
+    VectorDisplay = 6,
 };
 
 class ScreenTypeParameter : public IntParameter {
 public:
-    ScreenTypeParameter(juce::String name, juce::String id, int versionHint, ScreenType value) : IntParameter(name, id, versionHint, (int) value, 1, 5) {}
+    ScreenTypeParameter(juce::String name, juce::String id, int versionHint, ScreenType value) : IntParameter(name, id, versionHint, (int) value, 1, 6) {}
 
     juce::String getText(float value, int maximumStringLength = 100) const override {
         switch ((ScreenType)(int)getUnnormalisedValue(value)) {
@@ -33,6 +34,8 @@ public:
                 return "Smudged Graticule";
             case ScreenType::Real:
                 return "Real Oscilloscope";
+            case ScreenType::VectorDisplay:
+                return "Vector Display";
             default:
                 return "Unknown";
         }
@@ -50,6 +53,8 @@ public:
             unnormalisedValue = (int)ScreenType::SmudgedGraticule;
         } else if (text == "Real Oscilloscope") {
             unnormalisedValue = (int)ScreenType::Real;
+        } else if (text == "Vector Display") {
+            unnormalisedValue = (int)ScreenType::VectorDisplay;
         } else {
             unnormalisedValue = (int)ScreenType::Empty;
         }
@@ -63,6 +68,11 @@ public:
     void load(juce::XmlElement* xml) {
         setValueNotifyingHost(getValueForText(xml->getStringAttribute("screenType")));
     }
+    
+    bool isRealisticDisplay() {
+        ScreenType type = (ScreenType)(int)getValueUnnormalised();
+        return type == ScreenType::Real || type == ScreenType::VectorDisplay;
+    }
 };
 
 class VisualiserParameters {
@@ -133,7 +143,7 @@ public:
             "Ambient Light",
             "Controls how much ambient light is added to the oscilloscope display.",
             "ambient",
-            VERSION_HINT, 0.8, 0.0, 5.0
+            VERSION_HINT, 0.7, 0.0, 5.0
         )
     );
     std::shared_ptr<Effect> smoothEffect = std::make_shared<Effect>(

osci-render.jucer

@@ -35,6 +35,8 @@
         <FILE id="qpPhpN" name="empty.jpg" compile="0" resource="1" file="Resources/oscilloscope/empty.jpg"/>
         <FILE id="dNtZYs" name="noise.jpg" compile="0" resource="1" file="Resources/oscilloscope/noise.jpg"/>
         <FILE id="FyEDbA" name="real.jpg" compile="0" resource="1" file="Resources/oscilloscope/real.jpg"/>
+        <FILE id="QrCP4w" name="vector_display.jpg" compile="0" resource="1"
+              file="Resources/oscilloscope/vector_display.jpg"/>
       </GROUP>
       <GROUP id="{82BCD6F1-A8BF-F30B-5587-81EE70168883}" name="svg">
         <FILE id="rl17ZK" name="cog.svg" compile="0" resource="1" file="Resources/svg/cog.svg"/>

sosci.jucer

@@ -23,6 +23,9 @@
       <GROUP id="{F3C16D02-63B4-E3DA-7498-901173C37D6C}" name="oscilloscope">
         <FILE id="qpPhpN" name="empty.jpg" compile="0" resource="1" file="Resources/oscilloscope/empty.jpg"/>
         <FILE id="dNtZYs" name="noise.jpg" compile="0" resource="1" file="Resources/oscilloscope/noise.jpg"/>
+        <FILE id="xxXx4Q" name="real.jpg" compile="0" resource="1" file="Resources/oscilloscope/real.jpg"/>
+        <FILE id="bdQp0Q" name="vector_display.jpg" compile="0" resource="1"
+              file="Resources/oscilloscope/vector_display.jpg"/>
       </GROUP>
       <GROUP id="{82BCD6F1-A8BF-F30B-5587-81EE70168883}" name="svg">
         <FILE id="rl17ZK" name="cog.svg" compile="0" resource="1" file="Resources/svg/cog.svg"/>