void GLDrawInfo::SetupFloodStencil(wallseg * ws)
{
int recursion = GLPortal::GetRecursion();
// Create stencil
gl.StencilFunc(GL_EQUAL,recursion,~0); // create stencil
gl.StencilOp(GL_KEEP,GL_KEEP,GL_INCR); // increment stencil of valid pixels
gl.ColorMask(0,0,0,0); // don't write to the graphics buffer
gl_EnableTexture(false);
gl.Color3f(1,1,1);
gl.Enable(GL_DEPTH_TEST);
gl.DepthMask(true);
gl_DisableShader();
gl.Begin(GL_TRIANGLE_FAN);
gl.Vertex3f(ws->x1, ws->z1, ws->y1);
gl.Vertex3f(ws->x1, ws->z2, ws->y1);
gl.Vertex3f(ws->x2, ws->z2, ws->y2);
gl.Vertex3f(ws->x2, ws->z1, ws->y2);
gl.End();
gl.StencilFunc(GL_EQUAL,recursion+1,~0); // draw sky into stencil
gl.StencilOp(GL_KEEP,GL_KEEP,GL_KEEP); // this stage doesn't modify the stencil
gl.ColorMask(1,1,1,1); // don't write to the graphics buffer
gl_EnableTexture(true);
gl.Disable(GL_DEPTH_TEST);
gl.DepthMask(false);
}
void GLDrawInfo::ClearFloodStencil(wallseg * ws)
{
int recursion = GLPortal::GetRecursion();
gl.StencilOp(GL_KEEP,GL_KEEP,GL_DECR);
gl_EnableTexture(false);
gl.ColorMask(0,0,0,0); // don't write to the graphics buffer
gl.Color3f(1,1,1);
gl_DisableShader();
gl.Begin(GL_TRIANGLE_FAN);
gl.Vertex3f(ws->x1, ws->z1, ws->y1);
gl.Vertex3f(ws->x1, ws->z2, ws->y1);
gl.Vertex3f(ws->x2, ws->z2, ws->y2);
gl.Vertex3f(ws->x2, ws->z1, ws->y2);
gl.End();
// restore old stencil op.
gl.StencilOp(GL_KEEP,GL_KEEP,GL_KEEP);
gl.StencilFunc(GL_EQUAL,recursion,~0);
gl_EnableTexture(true);
gl.ColorMask(1,1,1,1);
gl.Enable(GL_DEPTH_TEST);
gl.DepthMask(true);
}
bool OpenGLFrameBuffer::WipeDo(int ticks)
{
// Sanity checks.
if (wipestartscreen == NULL || wipeendscreen == NULL)
{
return true;
}
gl_DisableShader();
bool done = ScreenWipe->Run(ticks, this);
//DrawLetterbox();
return done;
}
static void RenderSkyHemisphere(int hemi)
{
int r, c;
if (hemi & SKYHEMI_LOWER)
{
yflip = true;
}
else
{
yflip = false;
}
// The top row (row 0) is the one that's faded out.
// There must be at least 4 columns. The preferable number
// is 4n, where n is 1, 2, 3... There should be at least
// two rows because the first one is always faded.
rows = 4;
if (hemi & SKYHEMI_JUST_CAP)
{
return;
}
gl_DisableShader();
// Draw the cap as one solid color polygon
if (!foglayer)
{
columns = 4 * (gl_sky_detail > 0 ? gl_sky_detail : 1);
foglayer=true;
gl_EnableTexture(false);
if (!secondlayer)
{
gl.Color3f(R, G ,B);
gl.Begin(GL_TRIANGLE_FAN);
for(c = 0; c < columns; c++)
{
SkyVertex(1, c);
}
gl.End();
}
gl_EnableTexture(true);
foglayer=false;
gl_ApplyShader();
}
else
{
columns=4; // no need to do more!
gl.Begin(GL_TRIANGLE_FAN);
for(c = 0; c < columns; c++)
{
SkyVertex(0, c);
}
gl.End();
}
// The total number of triangles per hemisphere can be calculated
// as follows: rows * columns * 2 + 2 (for the top cap).
for(r = 0; r < rows; r++)
{
if (yflip)
{
gl.Begin(GL_TRIANGLE_STRIP);
SkyVertex(r + 1, 0);
SkyVertex(r, 0);
for(c = 1; c <= columns; c++)
{
SkyVertex(r + 1, c);
SkyVertex(r, c);
}
gl.End();
}
else
{
gl.Begin(GL_TRIANGLE_STRIP);
SkyVertex(r, 0);
SkyVertex(r + 1, 0);
for(c = 1; c <= columns; c++)
{
SkyVertex(r, c);
SkyVertex(r + 1, c);
}
gl.End();
}
}
}
