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Invert Quad::renderGrid() draw loop to be more cache friendly

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fgenesis 2022-09-14 05:36:46 +02:00
parent 4b64147914
commit b74c5a2986
1 changed files with 24 additions and 26 deletions
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50
BBGE/Quad.cpp
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@ -285,40 +285,38 @@ void Quad::renderGrid(const RenderState& rs) const
glBegin(GL_QUADS);
float u0 = baseX;
float u1 = u0 + incX;
for (size_t x = 0; x < NX; x++, u0 = u1, u1 += incX)
float v0 = 1 - percentY + baseY;
float v1 = v0 + incY;
for (size_t y = 0; y < NY; y++, v0 = v1, v1 += incY)
{
float v0 = 1 - percentY + baseY;
float v1 = v0 + incY;
for (size_t y = 0; y < NY; y++, v0 = v1, v1 += incY)
float u0 = baseX;
float u1 = u0 + incX;
const Vector *row0 = drawGrid.row(y);
const Vector *row1 = drawGrid.row(y+1);
for (size_t x = 0; x < NX; x++, u0 = u1, u1 += incX)
{
if (drawGrid(x,y).z != 0 || drawGrid(x,y+1).z != 0 || drawGrid(x+1,y).z != 0 || drawGrid(x+1,y+1).z != 0)
const Vector dg00 = row0[x];
const Vector dg01 = row1[x];
const Vector dg10 = row0[x+1];
const Vector dg11 = row1[x+1];
if (dg00.z != 0 || dg01.z != 0 || dg10.z != 0 || dg11.z != 0)
{
glColor4f(red, green, blue, alpha*drawGrid(x,y).z);
glColor4f(red, green, blue, alpha*dg00.z);
glTexCoord2f(u0, v0);
glVertex2f(w*dg00.x, h*dg00.y);
glVertex2f(w*drawGrid(x,y).x, h*drawGrid(x,y).y);
glColor4f(red, green, blue, alpha*drawGrid(x,y+1).z);
glColor4f(red, green, blue, alpha*dg01.z);
glTexCoord2f(u0, v1);
glVertex2f(w*dg01.x, h*dg01.y);
glVertex2f(w*drawGrid(x,y+1).x, h*drawGrid(x,y+1).y);
glColor4f(red, green, blue, alpha*drawGrid(x+1,y+1).z);
glColor4f(red, green, blue, alpha*dg11.z);
glTexCoord2f(u1, v1);
glVertex2f(w*dg11.x, h*dg11.y);
glVertex2f(w*drawGrid(x+1,y+1).x, h*drawGrid(x+1,y+1).y);
glColor4f(red, green, blue, alpha*drawGrid(x+1,y).z);
glColor4f(red, green, blue, alpha*dg10.z);
glTexCoord2f(u1, v0);
glVertex2f(w*drawGrid(x+1,y).x, h*drawGrid(x+1,y).y);
glVertex2f(w*dg10.x, h*dg10.y);
}
}
}
@ -331,9 +329,9 @@ void Quad::renderGrid(const RenderState& rs) const
glPointSize(2);
glColor3f(1,0,0);
glBegin(GL_POINTS);
for (size_t x = 0; x < NX; x++)
for (size_t y = 0; y < NY; y++)
{
for (size_t y = 0; y < NY; y++)
for (size_t x = 0; x < NX; x++)
{
glVertex2f(w*drawGrid(x,y).x, h*drawGrid(x,y).y);
glVertex2f(w*drawGrid(x,y+1).x, h*drawGrid(x,y+1).y);