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Merge pull request #1299 from srcejon/spectrum_gradient
Spectrum fill/gradient
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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" | ||
| ); |
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