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Spectrum: Enable alpha blending on gradient fill, so channel markers are visible

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This commit is contained in:
Jon Beniston 2022-06-22 10:07:35 +01:00
parent b8576cf0ae
commit 5c214c0382
3 changed files with 13 additions and 5 deletions
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13
sdrgui/gui/glshadercolormap.cpp
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@ -37,6 +37,7 @@ GLShaderColorMap::GLShaderColorMap() :
m_matrixLoc(0),
m_colorMapLoc(0),
m_scaleLoc(0),
m_alphaLoc(0),
m_useImmutableStorage(true)
{ }
@ -86,6 +87,7 @@ void GLShaderColorMap::initializeGL(int majorVersion, int minorVersion)
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);
@ -149,7 +151,7 @@ void GLShaderColorMap::initColorMapTextureMutable(const QString &colorMapName)
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, QOpenGLTexture::Repeat);
}
void GLShaderColorMap::drawSurfaceStrip(const QMatrix4x4& transformMatrix, GLfloat *vertices, int nbVertices, float scale)
void GLShaderColorMap::drawSurfaceStrip(const QMatrix4x4& transformMatrix, GLfloat *vertices, int nbVertices, float scale, float alpha)
{
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
m_program->bind();
@ -157,6 +159,7 @@ void GLShaderColorMap::drawSurfaceStrip(const QMatrix4x4& transformMatrix, GLflo
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();
@ -172,6 +175,8 @@ void GLShaderColorMap::drawSurfaceStrip(const QMatrix4x4& transformMatrix, GLflo
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)
@ -256,21 +261,23 @@ const QString GLShaderColorMap::m_vertexShaderSourceColorMap = QString(
);
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 = texture1D(colorMap, 1.0-(y/scale));\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 = texture(colorMap, 1.0-(y/scale));\n"
" fragColor = vec4(texture(colorMap, 1.0-(y/scale)).rgb, alpha);\n"
"}\n"
);

3
sdrgui/gui/glshadercolormap.h
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@ -41,7 +41,7 @@ public:
void initializeGL(int majorVersion, int minorVersion);
void initColorMapTexture(const QString &colorMapName);
void drawSurfaceStrip(const QMatrix4x4& transformMatrix, GLfloat *vertices, int nbVertices, float scale);
void drawSurfaceStrip(const QMatrix4x4& transformMatrix, GLfloat *vertices, int nbVertices, float scale, float alpha);
void cleanup();
private:
@ -58,6 +58,7 @@ private:
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;

2
sdrgui/gui/glspectrum.cpp
View File

@ -1345,7 +1345,7 @@ void GLSpectrum::paintGL()
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);
m_glShaderColorMap.drawSurfaceStrip(m_glHistogramSpectrumMatrix, q3, 2*m_nbBins, bottom, 0.75f);
} else {
m_glShaderSimple.drawSurfaceStrip(m_glHistogramSpectrumMatrix, color, q3, 2*m_nbBins);
}