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Code Issues Releases Wiki Activity

rework SongLineRender to use VBOs

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This commit is contained in:
fgenesis 2025-03-05 02:37:57 +01:00
parent e960000aa6
commit b3d67d286a
2 changed files with 38 additions and 13 deletions
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49
Aquaria/GridRender.cpp
View file

@ -229,6 +229,7 @@ void GridRender::onRender(const RenderState& rs) const
}
SongLineRender::SongLineRender()
: vbo(GPUBUF_VERTEXBUF | GPUBUF_DYNAMIC)
{
followCamera = 1;
cull = false;
@ -254,33 +255,55 @@ void SongLineRender::newPoint(const Vector &pt, const Vector &color)
pts[pts.size()-1].color = color;
pts[pts.size()-1].pt = pt;
}
updateVBO();
}
void SongLineRender::clear()
{
pts.clear();
vbo.dropBuffer();
}
void SongLineRender::updateVBO()
{
const size_t N = pts.size();
if(!N)
return;
const size_t bytes = pts.size() * 6 * sizeof(float);
const size_t alphaLine = (pts.size() * 9) / 10;
const float alphaLineInv = 1.0f / float(alphaLine);
do
{
float *p = (float*)vbo.beginWrite(GPUBUFTYPE_VEC2_RGBA, bytes, GPUACCESS_DEFAULT);
for (size_t i = 0; i < pts.size(); i++)
{
*p++ = pts[i].pt.x;
*p++ = pts[i].pt.y;
*p++ = pts[i].color.x;
*p++ = pts[i].color.y;
*p++ = pts[i].color.z;
*p++ = i < alphaLine ? float(i)*alphaLineInv : 1;
}
}
while(!vbo.commitWrite());
}
void SongLineRender::onRender(const RenderState& rs) const
{
const size_t N = pts.size();
if(!N)
return;
int w=core->getWindowWidth();
int ls = (4*w)/1024.0f;
if (ls < 0)
ls = 1;
glLineWidth(ls);
const unsigned int alphaLine = pts.size()*(0.9f);
float a = 1;
glBegin(GL_LINE_STRIP);
for (size_t i = 0; i < pts.size(); i++)
{
if (i < alphaLine)
a = float(i)/float(alphaLine);
else
a = 1;
glColor4f(pts[i].color.x, pts[i].color.y, pts[i].color.z, a);
glVertex2f(pts[i].pt.x, pts[i].pt.y);
}
glEnd();
vbo.apply();
glDrawArrays(GL_LINE_STRIP, 0, N);
}

2
Aquaria/GridRender.h
View file

@ -135,7 +135,9 @@ public:
void clear();
protected:
void onRender(const RenderState& rs) const OVERRIDE;
void updateVBO();
std::vector<SongLinePoint> pts;
DynamicGPUBuffer vbo;
};
#endif