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Switched multiple OpenGL calls to single a call for better efficiency

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This commit is contained in:
Adam Rohdin
2023-05-30 20:35:55 +02:00
parent b4337e8188
commit 6dcd3dfcdd
2 changed files with 12 additions and 6 deletions
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15
modules/space/rendering/renderableorbitalkepler.cpp
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@@ -296,11 +296,11 @@ void RenderableOrbitalKepler::render(const RenderData& data, RendererTasks&) {
//glDepthMask(false);
//glBlendFunc(GL_SRC_ALPHA, GL_ONE)
GLint* _si = &_startIndex[0];
GLint* _ss = &_segmentSize[0];
glBindVertexArray(_vertexArray);
for (size_t i = 0; i < nrOrbits; ++i) {
glDrawArrays(GL_LINE_STRIP, vertices, static_cast<GLsizei>(_segmentSize[i] + 1));
vertices = vertices + static_cast<GLint>(_segmentSize[i]) + 1;
}
glMultiDrawArrays(GL_LINE_STRIP, _si, _ss, static_cast<GLsizei>(_startIndex.size()));
glBindVertexArray(0);
_programObject->deactivate();
@@ -363,12 +363,17 @@ void RenderableOrbitalKepler::updateBuffers() {
}
_segmentSize.clear();
for (const kepler::Parameters& p : parameters) {
_startIndex.clear();
_startIndex.push_back(0);
for (int i = 0; i < parameters.size(); ++i) {
const double scale = static_cast<double>(_segmentQuality) * 10.0;
const kepler::Parameters& p = parameters[i];
_segmentSize.push_back(
static_cast<size_t>(scale + (scale / pow(1 - p.eccentricity, 1.2)))
);
_startIndex.push_back(_startIndex[i] + static_cast<GLint>(_segmentSize[i]) + 1);
}
_startIndex.pop_back();
size_t nVerticesTotal = 0;

3
modules/space/rendering/renderableorbitalkepler.h
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@@ -58,7 +58,8 @@ private:
bool _updateDataBuffersAtNextRender = false;
std::streamoff _numObjects;
std::vector<size_t> _segmentSize;
std::vector<GLint> _segmentSize;
std::vector<GLint> _startIndex;
properties::UIntProperty _segmentQuality;
properties::UIntProperty _startRenderIdx;
properties::UIntProperty _sizeRender;