Merge pull request #1299 from srcejon/spectrum_gradient

Spectrum fill/gradient

sdrbase/dsp/spectrumsettings.cpp

@@ -66,7 +66,8 @@ void SpectrumSettings::resetToDefaults()
 	m_useCalibration = false;
 	m_calibrationInterpMode = CalibInterpLinear;
     m_3DSpectrogramStyle = Outline;
-    m_3DSpectrogramColorMap = "Angel";
+    m_colorMap = "Angel";
+    m_spectrumStyle = Line;
 }
 
 QByteArray SpectrumSettings::serialize() const
@@ -104,7 +105,8 @@ QByteArray SpectrumSettings::serialize() const
 	s.writeS32(30, (int) m_calibrationInterpMode);
     s.writeBool(31, m_display3DSpectrogram);
     s.writeS32(32, (int) m_3DSpectrogramStyle);
-    s.writeString(33, m_3DSpectrogramColorMap);
+    s.writeString(33, m_colorMap);
+    s.writeS32(34, (int) m_spectrumStyle);
     s.writeS32(100, m_histogramMarkers.size());
 
 	for (int i = 0; i < m_histogramMarkers.size(); i++) {
@@ -204,7 +206,8 @@ bool SpectrumSettings::deserialize(const QByteArray& data)
 		m_calibrationInterpMode = (CalibrationInterpolationMode) tmp;
         d.readBool(31, &m_display3DSpectrogram, false);
         d.readS32(32, (int*)&m_3DSpectrogramStyle, (int)Outline);
-        d.readString(33, &m_3DSpectrogramColorMap, "Angel");
+        d.readString(33, &m_colorMap, "Angel");
+        d.readS32(34, (int*)&m_spectrumStyle, (int)Line);
 
 		int histogramMarkersSize;
 		d.readS32(100, &histogramMarkersSize, 0);

sdrbase/dsp/spectrumsettings.h

@@ -61,6 +61,13 @@ public:
         Shaded
     };
 
+    enum SpectrumStyle
+    {
+        Line,
+        Fill,
+        Gradient
+    };
+
 	int m_fftSize;
 	int m_fftOverlap;
 	FFTWindow::Function m_fftWindow;
@@ -97,7 +104,8 @@ public:
 	bool m_useCalibration;
 	CalibrationInterpolationMode m_calibrationInterpMode; //!< How is power interpolated between calibration points
     SpectrogramStyle m_3DSpectrogramStyle;
-    QString m_3DSpectrogramColorMap;
+    QString m_colorMap;
+    SpectrumStyle m_spectrumStyle;
 	static const int m_log2FFTSizeMin = 6;   // 64
 	static const int m_log2FFTSizeMax = 15;  // 32k
 

sdrbase/util/colormap.cpp

@@ -315,6 +315,7 @@ const float ColorMap::m_angel[m_size] =
     1.0, 1.0, 1.0,
     1.0, 1.0, 1.0,
     1.0, 1.0, 1.0,
+    1.0, 1.0, 1.0,
 };
 
 const float ColorMap::m_jet[m_size] =

sdrgui/CMakeLists.txt

@@ -44,6 +44,7 @@ set(sdrgui_SOURCES
     gui/glscope.cpp
     gui/glscopegui.cpp
     gui/glshadercolors.cpp
+    gui/glshadercolormap.cpp
     gui/glshadersimple.cpp
     gui/glshaderspectrogram.cpp
     gui/glshadertextured.cpp
@@ -145,6 +146,7 @@ set(sdrgui_HEADERS
     gui/glscope.h
     gui/glscopegui.h
     gui/glshadercolors.h
+    gui/glshadercolormap.h
     gui/glshadersimple.h
     gui/glshaderspectrogram.h
     gui/glshadertvarray.h

sdrgui/gui/glshadercolormap.cpp

@@ -0,0 +1,283 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2016 Edouard Griffiths, F4EXB                                   //
+// Copyright (C) 2022 Jon Beniston, M7RCE                                        //
+//                                                                               //
+// This program is free software; you can redistribute it and/or modify          //
+// it under the terms of the GNU General Public License as published by          //
+// the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
+//                                                                               //
+// This program is distributed in the hope that it will be useful,               //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#include <QOpenGLShaderProgram>
+#include <QOpenGLFunctions>
+#include <QOpenGLContext>
+#include <QImage>
+#include <QMatrix4x4>
+#include <QVector4D>
+#include <QDebug>
+
+#include "gui/glshadercolormap.h"
+#include "util/colormap.h"
+
+GLShaderColorMap::GLShaderColorMap() :
+    m_program(nullptr),
+    m_vao(nullptr),
+    m_verticesBuf(nullptr),
+    m_colorMapTexture(nullptr),
+    m_colorMapTextureId(0),
+    m_vertexLoc(0),
+    m_matrixLoc(0),
+    m_colorMapLoc(0),
+    m_scaleLoc(0),
+    m_alphaLoc(0),
+    m_useImmutableStorage(true)
+{ }
+
+GLShaderColorMap::~GLShaderColorMap()
+{
+    cleanup();
+}
+
+void GLShaderColorMap::initializeGL(int majorVersion, int minorVersion)
+{
+    initializeOpenGLFunctions();
+    m_useImmutableStorage = useImmutableStorage();
+    qDebug() << "GLShaderColorMap::initializeGL: m_useImmutableStorage: " << m_useImmutableStorage;
+
+    m_program = new QOpenGLShaderProgram;
+    if ((majorVersion > 3) || ((majorVersion == 3) && (minorVersion >= 3)))
+    {
+        if (!m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, m_vertexShaderSourceColorMap)) {
+            qDebug() << "GLShaderColorMap::initializeGL: error in vertex shader: " << m_program->log();
+        }
+        if (!m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, m_fragmentShaderSourceColorMap)) {
+            qDebug() << "GLShaderColorMap::initializeGL: error in fragment shader: " << m_program->log();
+        }
+
+        m_vao = new QOpenGLVertexArrayObject();
+        m_vao->create();
+        m_vao->bind();
+    }
+    else
+    {
+        if (!m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, m_vertexShaderSourceColorMap2)) {
+            qDebug() << "GLShaderColorMap::initializeGL: error in vertex shader: " << m_program->log();
+        }
+        if (!m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, m_fragmentShaderSourceColorMap2)) {
+            qDebug() << "GLShaderColorMap::initializeGL: error in fragment shader: " << m_program->log();
+        }
+    }
+
+    m_program->bindAttributeLocation("vertex", 0);
+
+    if (!m_program->link()) {
+        qDebug() << "GLShaderColorMap::initializeGL: error linking shader: " << m_program->log();
+    }
+
+    m_program->bind();
+    m_vertexLoc = m_program->attributeLocation("vertex");
+    m_matrixLoc = m_program->uniformLocation("uMatrix");
+    m_colorMapLoc = m_program->uniformLocation("colorMap");
+    m_scaleLoc = m_program->uniformLocation("scale");
+    m_alphaLoc = m_program->uniformLocation("alpha");
+    if (m_vao)
+    {
+        m_verticesBuf = new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer);
+        m_verticesBuf->setUsagePattern(QOpenGLBuffer::DynamicDraw);
+        m_verticesBuf->create();
+        m_vao->release();
+    }
+    m_program->release();
+}
+
+void GLShaderColorMap::initColorMapTexture(const QString &colorMapName)
+{
+    if (m_useImmutableStorage) {
+        initColorMapTextureImmutable(colorMapName);
+    } else {
+        initColorMapTextureMutable(colorMapName);
+    }
+}
+
+void GLShaderColorMap::initColorMapTextureImmutable(const QString &colorMapName)
+{
+    if (!m_colorMapTexture)
+    {
+        m_colorMapTexture = new QOpenGLTexture(QOpenGLTexture::Target1D);
+        m_colorMapTexture->setFormat(QOpenGLTexture::RGB32F);
+        m_colorMapTexture->setSize(256);
+        m_colorMapTexture->allocateStorage();
+        m_colorMapTexture->setMinificationFilter(QOpenGLTexture::Linear);
+        m_colorMapTexture->setMagnificationFilter(QOpenGLTexture::Linear);
+        m_colorMapTexture->setWrapMode(QOpenGLTexture::ClampToEdge);
+    }
+
+    GLfloat *colorMap = (GLfloat *)ColorMap::getColorMap(colorMapName);
+    if (colorMap) {
+        m_colorMapTexture->setData(QOpenGLTexture::RGB, QOpenGLTexture::Float32, colorMap);
+    } else {
+        qDebug() << "GLShaderColorMap::initColorMapTextureImmutable: colorMap " << colorMapName << " not supported";
+    }
+}
+
+void GLShaderColorMap::initColorMapTextureMutable(const QString &colorMapName)
+{
+    if (m_colorMapTextureId)
+    {
+        glDeleteTextures(1, &m_colorMapTextureId);
+        m_colorMapTextureId = 0;
+    }
+
+    glGenTextures(1, &m_colorMapTextureId);
+    glBindTexture(GL_TEXTURE_1D, m_colorMapTextureId);
+    GLfloat *colorMap = (GLfloat *)ColorMap::getColorMap(colorMapName);
+    if (colorMap) {
+        glTexImage1D(GL_TEXTURE_1D, 0, GL_RGB, 256, 0, GL_RGB, GL_FLOAT, colorMap);
+    } else {
+        qDebug() << "GLShaderColorMap::initColorMapTextureMutable: colorMap " << colorMapName << " not supported";
+    }
+
+    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, QOpenGLTexture::Repeat);
+    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, QOpenGLTexture::Repeat);
+}
+
+void GLShaderColorMap::drawSurfaceStrip(const QMatrix4x4& transformMatrix, GLfloat *vertices, int nbVertices, float scale, float alpha)
+{
+    QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
+    m_program->bind();
+    m_program->setUniformValue(m_matrixLoc, transformMatrix);
+    m_colorMapTexture->bind();
+    m_program->setUniformValue(m_colorMapLoc, 0); // Texture unit 0 for color map
+    m_program->setUniformValue(m_scaleLoc, scale);
+    m_program->setUniformValue(m_alphaLoc, alpha);
+    if (m_vao)
+    {
+        m_vao->bind();
+
+        m_verticesBuf->bind();
+        m_verticesBuf->allocate(vertices, nbVertices * 2 * sizeof(GL_FLOAT));
+        m_program->enableAttributeArray(m_vertexLoc);
+        m_program->setAttributeBuffer(m_vertexLoc, GL_FLOAT, 0, 2);
+    }
+    else
+    {
+        f->glEnableVertexAttribArray(m_vertexLoc);
+        f->glVertexAttribPointer(m_vertexLoc, 2, GL_FLOAT, GL_FALSE, 0, vertices);
+    }
+
+    f->glEnable(GL_BLEND);
+    f->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    f->glDrawArrays(GL_TRIANGLE_STRIP, 0, nbVertices);
+
+    if (m_vao)
+    {
+        m_vao->release();
+    }
+    else
+    {
+       f->glDisableVertexAttribArray(m_vertexLoc);
+    }
+    m_program->release();
+}
+
+void GLShaderColorMap::cleanup()
+{
+    delete m_program;
+    m_program = nullptr;
+    delete m_vao;
+    m_vao = nullptr;
+    delete m_verticesBuf;
+    m_verticesBuf = nullptr;
+    delete m_colorMapTexture;
+    m_colorMapTexture = nullptr;
+
+    if (!QOpenGLContext::currentContext()) {
+        return;
+    }
+
+    if (m_colorMapTextureId)
+    {
+        glDeleteTextures(1, &m_colorMapTextureId);
+        m_colorMapTextureId = 0;
+    }
+}
+
+bool GLShaderColorMap::useImmutableStorage()
+{
+    QOpenGLContext* ctx = QOpenGLContext::currentContext();
+    QSurfaceFormat sf = ctx->format();
+
+    if (sf.version() >= qMakePair(4, 2)
+        || ctx->hasExtension(QByteArrayLiteral("GL_ARB_texture_storage"))
+        || ctx->hasExtension(QByteArrayLiteral("GL_EXT_texture_storage")))
+    {
+        void (QOPENGLF_APIENTRYP glTexStorage2D)(
+            GLenum target, GLsizei levels, GLenum internalFormat, GLsizei width, GLsizei height);
+        glTexStorage2D = reinterpret_cast<void (QOPENGLF_APIENTRYP)(
+            GLenum, GLsizei, GLenum, GLsizei, GLsizei)>(ctx->getProcAddress("glTexStorage2D"));
+        int data = 0;
+        GLuint textureId;
+        glGenTextures(1, &textureId);
+        glBindTexture(GL_TEXTURE_2D, textureId);
+        glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 1, 1);
+        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE, &data);
+        GLenum err = glGetError();
+        glDeleteTextures(1, &textureId);
+        return err == GL_NO_ERROR;
+    }
+
+    return false;
+}
+
+const QString GLShaderColorMap::m_vertexShaderSourceColorMap2 = QString(
+        "uniform highp mat4 uMatrix;\n"
+        "attribute highp vec4 vertex;\n"
+        "varying float y;\n"
+        "void main() {\n"
+        "    gl_Position = uMatrix * vertex;\n"
+        "    y = vertex.y;\n"
+        "}\n"
+        );
+
+const QString GLShaderColorMap::m_vertexShaderSourceColorMap = QString(
+        "#version 330\n"
+        "uniform highp mat4 uMatrix;\n"
+        "in highp vec4 vertex;\n"
+        "out float y;\n"
+        "void main() {\n"
+        "    gl_Position = uMatrix * vertex;\n"
+        "    y = vertex.y;\n"
+        "}\n"
+        );
+
+const QString GLShaderColorMap::m_fragmentShaderSourceColorMap2 = QString(
+        "uniform float alpha;\n"
+        "uniform float scale;\n"
+        "uniform highp sampler1D colorMap;\n"
+        "varying float y;\n"
+        "void main() {\n"
+        "    gl_FragColor = vec4(texture1D(colorMap, 1.0-(y/scale)).rgb, alpha);\n"
+        "}\n"
+        );
+
+const QString GLShaderColorMap::m_fragmentShaderSourceColorMap = QString(
+        "#version 330\n"
+        "uniform float alpha;\n"
+        "uniform float scale;\n"
+        "uniform sampler1D colorMap;\n"
+        "in float y;\n"
+        "out vec4 fragColor;\n"
+        "void main() {\n"
+        "   fragColor = vec4(texture(colorMap, 1.0-(y/scale)).rgb, alpha);\n"
+        "}\n"
+        );

sdrgui/gui/glshadercolormap.h

@@ -0,0 +1,69 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2016 Edouard Griffiths, F4EXB                                   //
+// Copyright (C) 2022 Jon Beniston, M7RCE                                        //
+//                                                                               //
+// This program is free software; you can redistribute it and/or modify          //
+// it under the terms of the GNU General Public License as published by          //
+// the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
+//                                                                               //
+// This program is distributed in the hope that it will be useful,               //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDE_GUI_GLSHADERCOLORMAP_H_
+#define INCLUDE_GUI_GLSHADERCOLORMAP_H_
+
+#include <QString>
+#include <QOpenGLTexture>
+#include <QOpenGLFunctions>
+#include <QOpenGLVertexArrayObject>
+#include <QOpenGLBuffer>
+
+#include "export.h"
+
+class QOpenGLShaderProgram;
+class QMatrix4x4;
+class QVector4D;
+
+// Shader to fill with a gradient from a color map
+// Used for filling the area under the spectrum
+class SDRGUI_API GLShaderColorMap : protected QOpenGLFunctions
+{
+public:
+    GLShaderColorMap();
+    ~GLShaderColorMap();
+
+    void initializeGL(int majorVersion, int minorVersion);
+    void initColorMapTexture(const QString &colorMapName);
+    void drawSurfaceStrip(const QMatrix4x4& transformMatrix, GLfloat *vertices, int nbVertices, float scale, float alpha);
+    void cleanup();
+
+private:
+    void initColorMapTextureMutable(const QString &colorMapName);
+    void initColorMapTextureImmutable(const QString &colorMapName);
+    bool useImmutableStorage();
+
+    QOpenGLShaderProgram *m_program;
+    QOpenGLVertexArrayObject *m_vao;
+    QOpenGLBuffer *m_verticesBuf;
+    QOpenGLTexture *m_colorMapTexture;
+    unsigned int m_colorMapTextureId;
+    int m_vertexLoc;
+    int m_matrixLoc;
+    int m_colorMapLoc;
+    int m_scaleLoc;
+    int m_alphaLoc;
+    bool m_useImmutableStorage;
+    static const QString m_vertexShaderSourceColorMap2;
+    static const QString m_vertexShaderSourceColorMap;
+    static const QString m_fragmentShaderSourceColorMap2;
+    static const QString m_fragmentShaderSourceColorMap;
+};
+
+#endif /* INCLUDE_GUI_GLSHADERCOLORMAP_H_ */

sdrgui/gui/glshadersimple.cpp

@@ -111,6 +111,11 @@ void GLShaderSimple::drawSurface(const QMatrix4x4& transformMatrix, const QVecto
     draw(GL_TRIANGLE_FAN, transformMatrix, color, vertices, nbVertices, nbComponents);
 }
 
+void GLShaderSimple::drawSurfaceStrip(const QMatrix4x4& transformMatrix, const QVector4D& color, GLfloat *vertices, int nbVertices, int nbComponents)
+{
+    draw(GL_TRIANGLE_STRIP, transformMatrix, color, vertices, nbVertices, nbComponents);
+}
+
 void GLShaderSimple::draw(unsigned int mode, const QMatrix4x4& transformMatrix, const QVector4D& color, GLfloat *vertices, int nbVertices, int nbComponents)
 {
     QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();

sdrgui/gui/glshadersimple.h

@@ -42,6 +42,7 @@ public:
 	void drawSegments(const QMatrix4x4& transformMatrix, const QVector4D& color, GLfloat *vertices, int nbVertices, int nbComponents=2);
 	void drawContour(const QMatrix4x4& transformMatrix, const QVector4D& color, GLfloat *vertices, int nbVertices, int nbComponents=2);
 	void drawSurface(const QMatrix4x4& transformMatrix, const QVector4D& color, GLfloat *vertices, int nbVertices, int nbComponents=2);
+	void drawSurfaceStrip(const QMatrix4x4& transformMatrix, const QVector4D& color, GLfloat *vertices, int nbVertices, int nbComponents=2);
 	void cleanup();
 
 private:

sdrgui/gui/glspectrum.cpp

@@ -91,7 +91,7 @@ GLSpectrum::GLSpectrum(QWidget* parent) :
     m_pan3DSpectrogram(false),
     m_scaleZ3DSpectrogram(false),
     m_3DSpectrogramStyle(SpectrumSettings::Outline),
-    m_3DSpectrogramColorMap("Angel"),
+    m_colorMapName("Angel"),
     m_histogramBuffer(nullptr),
     m_histogram(nullptr),
     m_displayHistogram(true),
@@ -345,16 +345,22 @@ void GLSpectrum::setDisplay3DSpectrogram(bool display)
     update();
 }
 
+void GLSpectrum::setSpectrumStyle(SpectrumSettings::SpectrumStyle style)
+{
+    m_spectrumStyle = style;
+    update();
+}
+
 void GLSpectrum::set3DSpectrogramStyle(SpectrumSettings::SpectrogramStyle style)
 {
     m_3DSpectrogramStyle = style;
     update();
 }
 
-void GLSpectrum::set3DSpectrogramColorMap(const QString &colorMap)
+void GLSpectrum::setColorMapName(const QString &colorMapName)
 {
     m_mutex.lock();
-    m_3DSpectrogramColorMap = colorMap;
+    m_colorMapName = colorMapName;
     m_changesPending = true;
     m_mutex.unlock();
     update();
@@ -824,6 +830,7 @@ void GLSpectrum::initializeGL()
     m_glShaderFrequencyScale.initializeGL(majorVersion, minorVersion);
     m_glShaderWaterfall.initializeGL(majorVersion, minorVersion);
     m_glShaderHistogram.initializeGL(majorVersion, minorVersion);
+    m_glShaderColorMap.initializeGL(majorVersion, minorVersion);
     m_glShaderTextOverlay.initializeGL(majorVersion, minorVersion);
     m_glShaderInfo.initializeGL(majorVersion, minorVersion);
     m_glShaderSpectrogram.initializeGL(majorVersion, minorVersion);
@@ -1264,6 +1271,30 @@ void GLSpectrum::paintGL()
             // m_referenceLevel - m_powerRange : bottom
             m_maxHold[i] = ((j - 99) * m_powerRange) / 99.0 + m_referenceLevel;
         }
+        // Fill under max hold line
+        if (m_spectrumStyle != SpectrumSettings::Line)
+        {
+            GLfloat *q3 = m_q3ColorMap.m_array;
+            for (int i = 0; i < m_nbBins; i++)
+            {
+                Real v = m_maxHold[i] - m_referenceLevel;
+
+                if (v > 0) {
+                    v = 0;
+                } else if (v < -m_powerRange) {
+                    v = -m_powerRange;
+                }
+
+                q3[4*i] = (GLfloat)i;
+                q3[4*i+1] = -m_powerRange;
+                q3[4*i+2] = (GLfloat)i;
+                q3[4*i+3] = v;
+            }
+
+            QVector4D color(0.5f, 0.0f, 0.0f, (float) m_displayTraceIntensity / 100.0f);
+            m_glShaderSimple.drawSurfaceStrip(m_glHistogramSpectrumMatrix, color, q3, 2*m_nbBins);
+        }
+        // Max hold line
         {
             GLfloat *q3 = m_q3FFT.m_array;
 
@@ -1288,11 +1319,41 @@ void GLSpectrum::paintGL()
 
     // paint current spectrum line on top of histogram
     if ((m_displayCurrent) && m_currentSpectrum)
-    {
     {
         Real bottom = -m_powerRange;
-            GLfloat *q3 = m_q3FFT.m_array;
+        GLfloat *q3;
 
+        if (m_spectrumStyle != SpectrumSettings::Line)
+        {
+            q3 = m_q3ColorMap.m_array;
+            // Fill under line
+            for (int i = 0; i < m_nbBins; i++)
+            {
+                Real v = m_currentSpectrum[i] - m_referenceLevel;
+
+                if (v > 0) {
+                    v = 0;
+                } else if (v < bottom) {
+                    v = bottom;
+                }
+
+                q3[4*i] = (GLfloat)i;
+                q3[4*i+1] = bottom;
+                q3[4*i+2] = (GLfloat)i;
+                q3[4*i+3] = v;
+            }
+
+            QVector4D color(1.0f, 1.0f, 0.25f, (float) m_displayTraceIntensity / 100.0f);
+            if (m_spectrumStyle == SpectrumSettings::Gradient) {
+                m_glShaderColorMap.drawSurfaceStrip(m_glHistogramSpectrumMatrix, q3, 2*m_nbBins, bottom, 0.75f);
+            } else {
+                m_glShaderSimple.drawSurfaceStrip(m_glHistogramSpectrumMatrix, color, q3, 2*m_nbBins);
+            }
+        }
+
+        {
+            // Draw line
+            q3 = m_q3FFT.m_array;
             for (int i = 0; i < m_nbBins; i++)
             {
                 Real v = m_currentSpectrum[i] - m_referenceLevel;
@@ -1305,9 +1366,15 @@ void GLSpectrum::paintGL()
 
                 q3[2*i] = (Real) i;
                 q3[2*i+1] = v;
+
             }
 
-            QVector4D color(1.0f, 1.0f, 0.25f, (float) m_displayTraceIntensity / 100.0f);
+            QVector4D color;
+            if (m_spectrumStyle == SpectrumSettings::Gradient) {
+                color = QVector4D(m_colorMap[255*3], m_colorMap[255*3+1], m_colorMap[255*3+2], (float) m_displayTraceIntensity / 100.0f);
+            } else {
+                color = QVector4D(1.0f, 1.0f, 0.25f, (float) m_displayTraceIntensity / 100.0f);
+            }
             m_glShaderSimple.drawPolyline(m_glHistogramSpectrumMatrix, color, q3, m_nbBins);
         }
     }
@@ -2598,7 +2665,17 @@ void GLSpectrum::applyChanges()
         }
         m_3DSpectrogramBufferPos = 0;
     }
-    m_glShaderSpectrogram.initColorMapTexture(m_3DSpectrogramColorMap);
+    m_glShaderSpectrogram.initColorMapTexture(m_colorMapName);
+    m_glShaderColorMap.initColorMapTexture(m_colorMapName);
+    m_colorMap = ColorMap::getColorMap(m_colorMapName);
+    // Why only 240 entries in the palette?
+    for (int i = 0; i <= 239; i++)
+    {
+        ((quint8*)&m_waterfallPalette[i])[0] = (quint8)(m_colorMap[i*3] * 255.0);
+        ((quint8*)&m_waterfallPalette[i])[1] = (quint8)(m_colorMap[i*3+1] * 255.0);
+        ((quint8*)&m_waterfallPalette[i])[2] = (quint8)(m_colorMap[i*3+2] * 255.0);
+        ((quint8*)&m_waterfallPalette[i])[3] = 255;
+    }
 
     if (fftSizeChanged)
     {
@@ -2622,6 +2699,9 @@ void GLSpectrum::applyChanges()
         memset(m_histogram, 0x00, 100 * m_nbBins);
 
         m_q3FFT.allocate(2*m_nbBins);
+
+        m_q3ColorMap.allocate(4*m_nbBins);
+        std::fill(m_q3ColorMap.m_array, m_q3ColorMap.m_array+4*m_nbBins, 0.0f);
     }
 
     if (fftSizeChanged || windowSizeChanged)

sdrgui/gui/glspectrum.h

@@ -33,6 +33,7 @@
 #include "gui/scaleengine.h"
 #include "gui/glshadersimple.h"
 #include "gui/glshadertextured.h"
+#include "gui/glshadercolormap.h"
 #include "dsp/glspectruminterface.h"
 #include "gui/glshaderspectrogram.h"
 #include "dsp/spectrummarkers.h"
@@ -41,6 +42,7 @@
 #include "export.h"
 #include "util/incrementalarray.h"
 #include "util/message.h"
+#include "util/colormap.h"
 
 class QOpenGLShaderProgram;
 class MessageQueue;
@@ -146,7 +148,8 @@ public:
     void setDisplayWaterfall(bool display);
     void setDisplay3DSpectrogram(bool display);
     void set3DSpectrogramStyle(SpectrumSettings::SpectrogramStyle style);
-    void set3DSpectrogramColorMap(const QString &colorMap);
+    void setColorMapName(const QString &colorMapName);
+    void setSpectrumStyle(SpectrumSettings::SpectrumStyle style);
     void setSsbSpectrum(bool ssbSpectrum);
     void setLsbDisplay(bool lsbDisplay);
     void setInvertedWaterfall(bool inv);
@@ -312,7 +315,9 @@ private:
     QPixmap m_spectrogramTimePixmap;
     QPixmap m_spectrogramPowerPixmap;
     SpectrumSettings::SpectrogramStyle m_3DSpectrogramStyle;
-    QString m_3DSpectrogramColorMap;
+    QString m_colorMapName;
+    SpectrumSettings::SpectrumStyle m_spectrumStyle;
+    const float *m_colorMap;
 
     QRgb m_histogramPalette[240];
     QImage* m_histogramBuffer;
@@ -336,6 +341,7 @@ private:
     GLShaderTextured m_glShaderFrequencyScale;
     GLShaderTextured m_glShaderWaterfall;
     GLShaderTextured m_glShaderHistogram;
+    GLShaderColorMap m_glShaderColorMap;
     GLShaderTextured m_glShaderTextOverlay;
     GLShaderTextured m_glShaderInfo;
     GLShaderSpectrogram m_glShaderSpectrogram;
@@ -351,6 +357,7 @@ private:
     IncrementalArray<GLfloat> m_q3TickFrequency;
     IncrementalArray<GLfloat> m_q3TickPower;
     IncrementalArray<GLfloat> m_q3FFT;
+    IncrementalArray<GLfloat> m_q3ColorMap;
 
     MessageQueue *m_messageQueueToGUI;
     QOpenGLDebugLogger *m_openGLLogger;

sdrgui/gui/glspectrumgui.cpp

@@ -71,8 +71,8 @@ GLSpectrumGUI::GLSpectrumGUI(QWidget* parent) :
     ui->levelRange->setStyleSheet(levelStyle);
     ui->fftOverlap->setStyleSheet(levelStyle);
 
-    ui->spectrogramColorMap->addItems(ColorMap::getColorMapNames());
+    ui->colorMap->addItems(ColorMap::getColorMapNames());
-    ui->spectrogramColorMap->setCurrentText("Angel");
+    ui->colorMap->setCurrentText("Angel");
 
     connect(&m_messageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
 
@@ -161,8 +161,8 @@ void GLSpectrumGUI::displaySettings()
     ui->spectrogram->setChecked(m_settings.m_display3DSpectrogram);
     ui->spectrogramStyle->setCurrentIndex((int) m_settings.m_3DSpectrogramStyle);
     ui->spectrogramStyle->setVisible(m_settings.m_display3DSpectrogram);
-    ui->spectrogramColorMap->setCurrentText(m_settings.m_3DSpectrogramColorMap);
+    ui->colorMap->setCurrentText(m_settings.m_colorMap);
-    ui->spectrogramColorMap->setVisible(m_settings.m_display3DSpectrogram);
+    ui->spectrumStyle->setCurrentIndex((int) m_settings.m_spectrumStyle);
     ui->maxHold->setChecked(m_settings.m_displayMaxHold);
     ui->current->setChecked(m_settings.m_displayCurrent);
     ui->histogram->setChecked(m_settings.m_displayHistogram);
@@ -246,7 +246,8 @@ void GLSpectrumGUI::applySpectrumSettings()
     m_glSpectrum->setDisplayWaterfall(m_settings.m_displayWaterfall);
     m_glSpectrum->setDisplay3DSpectrogram(m_settings.m_display3DSpectrogram);
     m_glSpectrum->set3DSpectrogramStyle(m_settings.m_3DSpectrogramStyle);
-    m_glSpectrum->set3DSpectrogramColorMap(m_settings.m_3DSpectrogramColorMap);
+    m_glSpectrum->setColorMapName(m_settings.m_colorMap);
+    m_glSpectrum->setSpectrumStyle(m_settings.m_spectrumStyle);
     m_glSpectrum->setInvertedWaterfall(m_settings.m_invertedWaterfall);
     m_glSpectrum->setDisplayMaxHold(m_settings.m_displayMaxHold);
     m_glSpectrum->setDisplayCurrent(m_settings.m_displayCurrent);
@@ -463,16 +464,22 @@ void GLSpectrumGUI::on_stroke_valueChanged(int index)
     applySettings();
 }
 
+void GLSpectrumGUI::on_spectrumStyle_currentIndexChanged(int index)
+{
+    m_settings.m_spectrumStyle = (SpectrumSettings::SpectrumStyle)index;
+    applySettings();
+}
+
 void GLSpectrumGUI::on_spectrogramStyle_currentIndexChanged(int index)
 {
     m_settings.m_3DSpectrogramStyle = (SpectrumSettings::SpectrogramStyle)index;
     applySettings();
 }
 
-void GLSpectrumGUI::on_spectrogramColorMap_currentIndexChanged(int index)
+void GLSpectrumGUI::on_colorMap_currentIndexChanged(int index)
 {
     (void) index;
-    m_settings.m_3DSpectrogramColorMap = ui->spectrogramColorMap->currentText();
+    m_settings.m_colorMap = ui->colorMap->currentText();
     applySettings();
 }
 
@@ -498,7 +505,6 @@ void GLSpectrumGUI::on_spectrogram_toggled(bool checked)
         blockApplySettings(false);
     }
     ui->spectrogramStyle->setVisible(m_settings.m_display3DSpectrogram);
-    ui->spectrogramColorMap->setVisible(m_settings.m_display3DSpectrogram);
     applySettings();
 }
 

sdrgui/gui/glspectrumgui.h

@@ -96,8 +96,9 @@ private slots:
 	void on_decay_valueChanged(int index);
 	void on_decayDivisor_valueChanged(int index);
 	void on_stroke_valueChanged(int index);
+    void on_spectrumStyle_currentIndexChanged(int index);
     void on_spectrogramStyle_currentIndexChanged(int index);
-    void on_spectrogramColorMap_currentIndexChanged(int index);
+    void on_colorMap_currentIndexChanged(int index);
 	void on_gridIntensity_valueChanged(int index);
 	void on_traceIntensity_valueChanged(int index);
 	void on_averagingMode_currentIndexChanged(int index);

sdrgui/gui/glspectrumgui.ui

@@ -723,6 +723,40 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QComboBox" name="spectrumStyle">
+       <property name="minimumSize">
+        <size>
+         <width>80</width>
+         <height>0</height>
+        </size>
+       </property>
+       <property name="maximumSize">
+        <size>
+         <width>80</width>
+         <height>16777215</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Spectrum Style</string>
+       </property>
+       <item>
+        <property name="text">
+         <string>Line</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Fill</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>Gradient</string>
+        </property>
+       </item>
+      </widget>
+     </item>
      <item>
       <widget class="QDial" name="traceIntensity">
        <property name="maximumSize">
@@ -865,7 +899,7 @@
       </widget>
      </item>
      <item>
-      <widget class="QComboBox" name="spectrogramColorMap">
+      <widget class="QComboBox" name="colorMap">
        <property name="minimumSize">
         <size>
          <width>70</width>
@@ -879,7 +913,7 @@
         </size>
        </property>
        <property name="toolTip">
-        <string>3D Spectrogram Color Map</string>
+        <string>Color Map</string>
        </property>
       </widget>
      </item>