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Use VAOs for OpenGL 3 CoreProfile

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This commit is contained in:
Jon Beniston
2022-06-19 11:22:46 +01:00
parent e31880fc66
commit 74d61855e4
6 changed files with 224 additions and 90 deletions
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sdrgui/gui/glshaderspectrogram.cpp
+96 -56
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@@ -18,6 +18,7 @@
#include <QOpenGLShaderProgram>
#include <QOpenGLFunctions>
#include <QOpenGLFunctions_3_3_Core>
#include <QOpenGLContext>
#include <QtOpenGL>
#include <QImage>
@@ -36,6 +37,7 @@ GLShaderSpectrogram::GLShaderSpectrogram() :
m_colorMapTexture(nullptr),
m_colorMapTextureId(0),
m_programForLocs(nullptr),
m_coord2dLoc(0),
m_textureTransformLoc(0),
m_vertexTransformLoc(0),
m_dataTextureLoc(0),
@@ -45,9 +47,10 @@ GLShaderSpectrogram::GLShaderSpectrogram() :
m_lightDirLoc(0),
m_lightPosLoc(0),
m_useImmutableStorage(true),
m_vertexBuf(QOpenGLBuffer::VertexBuffer),
m_index0Buf(QOpenGLBuffer::IndexBuffer),
m_index1Buf(QOpenGLBuffer::IndexBuffer),
m_vao(nullptr),
m_vertexBuf(nullptr),
m_index0Buf(nullptr),
m_index1Buf(nullptr),
m_translateX(0.0),
m_translateY(0.0),
m_translateZ(0.0),
@@ -107,6 +110,10 @@ void GLShaderSpectrogram::initializeGL(int majorVersion, int minorVersion)
if (!m_programSimple->link()) {
qDebug() << "GLShaderSpectrogram::initializeGL: error linking shader: " << m_programSimple->log();
}
m_vao = new QOpenGLVertexArrayObject();
m_vao->create();
m_vao->bind();
}
else
{
@@ -121,6 +128,20 @@ void GLShaderSpectrogram::initializeGL(int majorVersion, int minorVersion)
qDebug() << "GLShaderSpectrogram::initializeGL: error linking shader: " << m_programSimple->log();
}
}
m_vertexBuf = new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer);
m_vertexBuf->setUsagePattern(QOpenGLBuffer::StaticDraw);
m_vertexBuf->create();
m_index0Buf = new QOpenGLBuffer(QOpenGLBuffer::IndexBuffer);
m_index0Buf->setUsagePattern(QOpenGLBuffer::StaticDraw);
m_index0Buf->create();
m_index1Buf = new QOpenGLBuffer(QOpenGLBuffer::IndexBuffer);
m_index1Buf->setUsagePattern(QOpenGLBuffer::StaticDraw);
m_index1Buf->create();
if (m_vao) {
m_vao->release();
}
}
void GLShaderSpectrogram::initGrid(int elements)
@@ -141,17 +162,12 @@ void GLShaderSpectrogram::initGrid(int elements)
}
}
m_vertexBuf.setUsagePattern(QOpenGLBuffer::StaticDraw);
m_vertexBuf.create();
if (m_vao) {
m_vao->bind();
}
m_index0Buf.setUsagePattern(QOpenGLBuffer::StaticDraw);
m_index0Buf.create();
m_index1Buf.setUsagePattern(QOpenGLBuffer::StaticDraw);
m_index1Buf.create();
m_vertexBuf.bind();
m_vertexBuf.allocate(&vertices[0], vertices.size() * sizeof(QVector2D));
m_vertexBuf->bind();
m_vertexBuf->allocate(&vertices[0], vertices.size() * sizeof(QVector2D));
// Create an array of indices into the vertex array that traces both horizontal and vertical lines
std::vector<GLuint> indices(m_gridElements * m_gridElements * 6);
@@ -171,8 +187,8 @@ void GLShaderSpectrogram::initGrid(int elements)
}
}
m_index0Buf.bind();
m_index0Buf.allocate(&indices[0], m_gridElements * (e1) * 4 * sizeof(GLuint));
m_index0Buf->bind();
m_index0Buf->allocate(&indices[0], m_gridElements * (e1) * 4 * sizeof(GLuint));
// Create another array of indices that describes all the triangles needed to create a completely filled surface
i = 0;
@@ -189,12 +205,19 @@ void GLShaderSpectrogram::initGrid(int elements)
}
}
m_index1Buf.bind();
m_index1Buf.allocate(&indices[0], indices.size() * sizeof(GLuint));
m_index1Buf->bind();
m_index1Buf->allocate(&indices[0], indices.size() * sizeof(GLuint));
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glBindBuffer(GL_ARRAY_BUFFER, 0);
f->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
if (m_vao)
{
m_vao->release();
}
else
{
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glBindBuffer(GL_ARRAY_BUFFER, 0);
f->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
}
void GLShaderSpectrogram::initColorMapTexture(const QString &colorMapName)
@@ -356,6 +379,7 @@ void GLShaderSpectrogram::drawSurface(SpectrumSettings::SpectrogramStyle style,
if (program != m_programForLocs)
{
m_coord2dLoc = program->attributeLocation("coord2d");
m_textureTransformLoc = program->uniformLocation("textureTransform");
m_vertexTransformLoc = program->uniformLocation("vertexTransform");
m_dataTextureLoc = program->uniformLocation("dataTexture");
@@ -414,17 +438,28 @@ void GLShaderSpectrogram::drawSurface(SpectrumSettings::SpectrogramStyle style,
program->setUniformValueArray(m_lightPosLoc, lightPos, 1, 3);
}
if (m_vao) {
m_vao->bind();
}
f->glEnable(GL_DEPTH_TEST);
f->glPolygonOffset(1, 0);
f->glEnable(GL_POLYGON_OFFSET_FILL);
int attribute_coord2d = program->attributeLocation("coord2d");
f->glEnableVertexAttribArray(attribute_coord2d);
m_vertexBuf.bind();
f->glVertexAttribPointer(attribute_coord2d, 2, GL_FLOAT, GL_FALSE, 0, 0);
m_vertexBuf->bind();
if (m_vao)
{
program->enableAttributeArray(m_coord2dLoc);
program->setAttributeBuffer(m_coord2dLoc, GL_FLOAT, 0, 2);
}
else
{
f->glEnableVertexAttribArray(m_coord2dLoc);
f->glVertexAttribPointer(m_coord2dLoc, 2, GL_FLOAT, GL_FALSE, 0, 0);
}
m_index1Buf.bind();
m_index1Buf->bind();
switch (style)
{
case SpectrumSettings::Points:
@@ -447,14 +482,29 @@ void GLShaderSpectrogram::drawSurface(SpectrumSettings::SpectrogramStyle style,
{
// Draw the outline
program->setUniformValue(m_brightnessLoc, 1.5f);
m_index0Buf.bind();
m_index0Buf->bind();
f->glDrawElements(GL_LINES, m_gridElements * (m_gridElements+1) * 4, GL_UNSIGNED_INT, 0);
}
f->glDisableVertexAttribArray(attribute_coord2d);
// Need to do this, otherwise nothing else is drawn...
f->glBindBuffer(GL_ARRAY_BUFFER, 0);
f->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
if (m_vao) {
program->disableAttributeArray(m_coord2dLoc);
} else {
f->glDisableVertexAttribArray(m_coord2dLoc);
}
if (m_vao)
{
m_vao->release();
m_vertexBuf->release();
m_index0Buf->release();
m_index1Buf->release();
}
else
{
// Need to do this, otherwise nothing else is drawn by other shaders
f->glBindBuffer(GL_ARRAY_BUFFER, 0);
f->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
// If this is left enabled, channel markers aren't drawn properly
f->glDisable(GL_DEPTH_TEST);
@@ -464,30 +514,26 @@ void GLShaderSpectrogram::drawSurface(SpectrumSettings::SpectrogramStyle style,
void GLShaderSpectrogram::cleanup()
{
delete m_programShaded;
m_programShaded = nullptr;
delete m_programSimple;
m_programSimple = nullptr;
m_programForLocs = nullptr;
delete m_texture;
m_texture = nullptr;
delete m_colorMapTexture;
m_colorMapTexture = nullptr;
delete m_vertexBuf;
m_vertexBuf = nullptr;
delete m_index0Buf;
m_index0Buf = nullptr;
delete m_index1Buf;
m_index1Buf = nullptr;
if (!QOpenGLContext::currentContext()) {
return;
}
if (m_programShaded)
{
delete m_programShaded;
m_programShaded = nullptr;
}
if (m_programSimple)
{
delete m_programSimple;
m_programSimple = nullptr;
}
m_programForLocs = nullptr;
if (m_texture)
{
delete m_texture;
m_texture = nullptr;
}
if (m_textureId)
{
glDeleteTextures(1, &m_textureId);
@@ -499,12 +545,6 @@ void GLShaderSpectrogram::cleanup()
glDeleteTextures(1, &m_colorMapTextureId);
m_colorMapTextureId = 0;
}
if (m_colorMapTexture)
{
delete m_colorMapTexture;
m_colorMapTexture = nullptr;
}
}
bool GLShaderSpectrogram::useImmutableStorage()