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Rewrite spheric mirror to make it more efficient #3954

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Oct 18, 2024
Merged

Rewrite spheric mirror to make it more efficient #3954

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173 changes: 157 additions & 16 deletions src/core/StelViewportEffect.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,19 @@
#include <QFile>
#include <QDir>

namespace
{
constexpr int SPHERIC_MIRROR_COORDS_PER_VERTEX = 2;
constexpr int SPHERIC_MIRROR_COORDS_PER_COLOR = 4;
constexpr int SPHERIC_MIRROR_COORDS_PER_TEXCOORD = 2;
enum
{
VERTEX_ATTRIB_INDEX,
COLOR_ATTRIB_INDEX,
TEXCOORD_ATTRIB_INDEX,
};
}

void StelViewportEffect::paintViewportBuffer(const QOpenGLFramebufferObject* buf) const
{
StelPainter sPainter(StelApp::getInstance().getCore()->getProjection2d());
Expand All @@ -51,6 +64,8 @@ StelViewportDistorterFisheyeToSphericMirror::StelViewportDistorterFisheyeToSpher
, screen_h(screen_h)
, originalProjectorParams(StelApp::getInstance().getCore()->getCurrentStelProjectorParams())
, texture_point_array(Q_NULLPTR)
, vao(new QOpenGLVertexArrayObject)
, verticesVBO(new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer))
{
QSettings& conf = *StelApp::getInstance().getSettings();
StelCore* core = StelApp::getInstance().getCore();
Expand Down Expand Up @@ -236,12 +251,132 @@ StelViewportDistorterFisheyeToSphericMirror::StelViewportDistorterFisheyeToSpher
}
}
delete[] vertex_point_array;

StelApp::getInstance().ensureGLContextCurrent();
setupBuffers();
setupShaders();
}

void StelViewportDistorterFisheyeToSphericMirror::setupShaders()
{
QOpenGLShader vsh(QOpenGLShader::Vertex);
const auto vsrc =
StelOpenGL::globalShaderPrefix(StelOpenGL::VERTEX_SHADER) +
"ATTRIBUTE highp vec3 vertex;\n"
"ATTRIBUTE mediump vec2 texCoord;\n"
"ATTRIBUTE mediump vec4 color;\n"
"uniform mediump mat4 projectionMatrix;\n"
"VARYING mediump vec2 texc;\n"
"VARYING mediump vec4 outColor;\n"
"void main()\n"
"{\n"
" gl_Position = projectionMatrix * vec4(vertex, 1.);\n"
" texc = texCoord;\n"
" outColor = color;\n"
"}\n";
vsh.compileSourceCode(vsrc);
if (!vsh.log().isEmpty())
qWarning().noquote() << "StelViewportDistorterFisheyeToSphericMirror: Warnings while compiling vertex shader: " << vsh.log();

QOpenGLShader fsh(QOpenGLShader::Fragment);
const auto fsrc =
StelOpenGL::globalShaderPrefix(StelOpenGL::FRAGMENT_SHADER) +
"VARYING mediump vec2 texc;\n"
"VARYING mediump vec4 outColor;\n"
"uniform sampler2D tex;\n"
"void main()\n"
"{\n"
" FRAG_COLOR = texture2D(tex, texc)*outColor;\n"
"}\n";
fsh.compileSourceCode(fsrc);
if (!fsh.log().isEmpty())
qWarning().noquote() << "StelViewportDistorterFisheyeToSphericMirror: Warnings while compiling fragment shader: " << fsh.log();

shaderProgram.reset(new QOpenGLShaderProgram(QOpenGLContext::currentContext()));
shaderProgram->addShader(&vsh);
shaderProgram->addShader(&fsh);
shaderProgram->bindAttributeLocation("vertex", VERTEX_ATTRIB_INDEX);
shaderProgram->bindAttributeLocation("color", COLOR_ATTRIB_INDEX);
shaderProgram->bindAttributeLocation("texCoord", TEXCOORD_ATTRIB_INDEX);
StelPainter::linkProg(shaderProgram.get(), "spheric mirror distortion shader program");
shaderVars.projectionMatrix = shaderProgram->uniformLocation("projectionMatrix");
shaderVars.texture = shaderProgram->uniformLocation("tex");
}

void StelViewportDistorterFisheyeToSphericMirror::setupBuffers()
{
verticesVBO->create();
verticesVBO->setUsagePattern(QOpenGLBuffer::StaticDraw);
verticesVBO->bind();
const int colorElemSize = SPHERIC_MIRROR_COORDS_PER_COLOR * sizeof(GLfloat);
const int vertElemSize = SPHERIC_MIRROR_COORDS_PER_VERTEX * sizeof(GLfloat);
const int texCoordElemSize = SPHERIC_MIRROR_COORDS_PER_TEXCOORD * sizeof(GLfloat);
const int numberOfVerticesToCopy = displayVertexList.size();
const auto bufferSize = vertElemSize*numberOfVerticesToCopy +
texCoordElemSize*numberOfVerticesToCopy +
colorElemSize*numberOfVerticesToCopy;
verticesVBO->allocate(bufferSize);
vboVertexDataOffset = 0;
const auto vertexDataSize = vertElemSize*numberOfVerticesToCopy;
verticesVBO->write(vboVertexDataOffset, displayVertexList.constData(), vertexDataSize);
vboTexCoordDataOffset = vertexDataSize;
const auto texCoordDataSize = texCoordElemSize*numberOfVerticesToCopy;
verticesVBO->write(vboTexCoordDataOffset, displayTexCoordList.constData(), texCoordDataSize);
vboColorDataOffset = vertexDataSize + texCoordDataSize;
const auto colorDataSize = colorElemSize*numberOfVerticesToCopy;
verticesVBO->write(vboColorDataOffset, displayColorList.constData(), colorDataSize);
verticesVBO->release();

vao->create();
bindVAO();
setupCurrentVAO();
releaseVAO();
}

void StelViewportDistorterFisheyeToSphericMirror::setupCurrentVAO() const
{
auto& gl = *QOpenGLContext::currentContext()->functions();
verticesVBO->bind();
gl.glVertexAttribPointer(VERTEX_ATTRIB_INDEX, SPHERIC_MIRROR_COORDS_PER_VERTEX, GL_FLOAT,
false, 0, reinterpret_cast<const void*>(vboVertexDataOffset));
gl.glVertexAttribPointer(COLOR_ATTRIB_INDEX, SPHERIC_MIRROR_COORDS_PER_COLOR, GL_FLOAT,
false, 0, reinterpret_cast<const void*>(vboColorDataOffset));
gl.glVertexAttribPointer(TEXCOORD_ATTRIB_INDEX, SPHERIC_MIRROR_COORDS_PER_TEXCOORD, GL_FLOAT,
false, 0, reinterpret_cast<const void*>(vboTexCoordDataOffset));
verticesVBO->release();
gl.glEnableVertexAttribArray(VERTEX_ATTRIB_INDEX);
gl.glEnableVertexAttribArray(COLOR_ATTRIB_INDEX);
gl.glEnableVertexAttribArray(TEXCOORD_ATTRIB_INDEX);
}

void StelViewportDistorterFisheyeToSphericMirror::bindVAO() const
{
if(vao->isCreated())
vao->bind();
else
setupCurrentVAO();
}

void StelViewportDistorterFisheyeToSphericMirror::releaseVAO() const
{
if(vao->isCreated())
{
vao->release();
}
else
{
auto& gl = *QOpenGLContext::currentContext()->functions();
gl.glDisableVertexAttribArray(VERTEX_ATTRIB_INDEX);
gl.glDisableVertexAttribArray(COLOR_ATTRIB_INDEX);
gl.glDisableVertexAttribArray(TEXCOORD_ATTRIB_INDEX);
}
}


StelViewportDistorterFisheyeToSphericMirror::~StelViewportDistorterFisheyeToSphericMirror(void)
{
StelApp::getInstance().ensureGLContextCurrent(); // Make sure that VBO & VAO will be properly deleted

if (texture_point_array)
delete[] texture_point_array;
StelApp::getInstance().getCore()->setCurrentStelProjectorParams(originalProjectorParams);
Expand Down Expand Up @@ -323,24 +458,30 @@ void StelViewportDistorterFisheyeToSphericMirror::distortXY(qreal &x, qreal &y)

void StelViewportDistorterFisheyeToSphericMirror::paintViewportBuffer(const QOpenGLFramebufferObject* buf) const
{
StelPainter sPainter(StelApp::getInstance().getCore()->getProjection2d());
QOpenGLFunctions* gl = sPainter.glFuncs();
GL(gl->glActiveTexture(GL_TEXTURE0));
GL(gl->glBindTexture(GL_TEXTURE_2D, buf->texture()));
GL(gl->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
GL(gl->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
sPainter.setBlending(false);

sPainter.enableClientStates(true, true, true);
sPainter.setColorPointer(4, GL_FLOAT, displayColorList.constData());
sPainter.setVertexPointer(2, GL_FLOAT, displayVertexList.constData());
sPainter.setTexCoordPointer(2, GL_FLOAT, displayTexCoordList.constData());
const auto prj = StelApp::getInstance().getCore()->getProjection2d();
auto& gl = *QOpenGLContext::currentContext()->functions();
const int texUnit = 0;
GL(gl.glActiveTexture(GL_TEXTURE0 + texUnit));
GL(gl.glBindTexture(GL_TEXTURE_2D, buf->texture()));
GL(gl.glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
GL(gl.glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));

shaderProgram->bind();
const Mat4f& m = prj->getProjectionMatrix();
const QMatrix4x4 qMat(m[0], m[4], m[8], m[12], m[1], m[5], m[9], m[13], m[2], m[6], m[10], m[14], m[3], m[7], m[11], m[15]);
shaderProgram->setUniformValue(shaderVars.projectionMatrix, qMat);
shaderProgram->setUniformValue(shaderVars.texture, texUnit);

bindVAO();
for (int j=0;j<max_y;j++)
{
sPainter.drawFromArray(StelPainter::TriangleStrip, (max_x+1)*2, j*(max_x+1)*2, false);
GL(gl.glDrawArrays(GL_TRIANGLE_STRIP, j*(max_x+1)*2, (max_x+1)*2));
}
sPainter.enableClientStates(false);
GL(gl->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
GL(gl->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
releaseVAO();

shaderProgram->release();

GL(gl.glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
GL(gl.glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
}

24 changes: 24 additions & 0 deletions src/core/StelViewportEffect.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,12 @@
#ifndef STELVIEWPORTEFFECT_HPP
#define STELVIEWPORTEFFECT_HPP

#include <memory>
#include "VecMath.hpp"
#include "StelProjector.hpp"
#include <QOpenGLBuffer>
#include <QOpenGLShaderProgram>
#include <QOpenGLVertexArrayObject>

class QOpenGLFramebufferObject;

Expand Down Expand Up @@ -54,6 +58,14 @@ class StelViewportDistorterFisheyeToSphericMirror : public StelViewportEffect
QString getName() const override {return "sphericMirrorDistorter";}
void paintViewportBuffer(const QOpenGLFramebufferObject* buf) const override;
void distortXY(qreal& x, qreal& y) const override;

private:
void setupShaders();
void setupBuffers();
void bindVAO() const;
void releaseVAO() const;
void setupCurrentVAO() const;

private:
const int screen_w;
const int screen_h;
Expand All @@ -68,6 +80,18 @@ class StelViewportDistorterFisheyeToSphericMirror : public StelViewportEffect
QVector<Vec2f> displayVertexList;
QVector<Vec4f> displayColorList;
QVector<Vec2f> displayTexCoordList;
std::unique_ptr<QOpenGLVertexArrayObject> vao;
std::unique_ptr<QOpenGLBuffer> verticesVBO;
std::unique_ptr<QOpenGLShaderProgram> shaderProgram;
int vboVertexDataOffset;
int vboTexCoordDataOffset;
int vboColorDataOffset;
struct ShaderVars
{
int projectionMatrix;
int texture;
};
ShaderVars shaderVars;
};

#endif // STELVIEWPORTEFFECT_HPP
Expand Down
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