void TerrainOverlay::RenderBeforeWater()
{
if (!m_Terrain)
return; // should never happen, but let's play it safe
#if CONFIG2_GLES
#warning TODO: implement TerrainOverlay::RenderOverlays for GLES
#else
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDepthMask(GL_FALSE);
// To ensure that outlines are drawn on top of the terrain correctly (and
// don't Z-fight and flicker nastily), draw them as QUADS with the LINE
// PolygonMode, and use PolygonOffset to pull them towards the camera.
// (See e.g. http://www.opengl.org/resources/faq/technical/polygonoffset.htm)
glPolygonOffset(-1.f, -1.f);
glEnable(GL_POLYGON_OFFSET_LINE);
pglActiveTextureARB(GL_TEXTURE0);
glDisable(GL_TEXTURE_2D);
StartRender();
ssize_t min_i, min_j, max_i, max_j;
GetTileExtents(min_i, min_j, max_i, max_j);
// Clamp the min to 0, but the max to -1 - so tile -1 can never be rendered,
// but if unclamped_max<0 then no tiles at all will be rendered. And the same
// for the upper limit.
min_i = clamp(min_i, ssize_t(0), m_Terrain->GetTilesPerSide());
min_j = clamp(min_j, ssize_t(0), m_Terrain->GetTilesPerSide());
max_i = clamp(max_i, ssize_t(-1), m_Terrain->GetTilesPerSide()-1);
max_j = clamp(max_j, ssize_t(-1), m_Terrain->GetTilesPerSide()-1);
for (m_j = min_j; m_j <= max_j; ++m_j)
for (m_i = min_i; m_i <= max_i; ++m_i)
ProcessTile(m_i, m_j);
EndRender();
// Clean up state changes
glEnable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
glDisable(GL_POLYGON_OFFSET_LINE);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glDepthMask(GL_TRUE);
glDisable(GL_BLEND);
#endif
}
void TerrainOverlay::Render()
{
m_Terrain = g_Game->GetWorld()->GetTerrain();
StartRender();
ssize_t min_i, min_j, max_i, max_j;
GetTileExtents(min_i, min_j, max_i, max_j);
// Clamp the min to 0, but the max to -1 - so tile -1 can never be rendered,
// but if unclamped_max<0 then no tiles at all will be rendered. And the same
// for the upper limit.
min_i = clamp(min_i, ssize_t(0), m_Terrain->GetTilesPerSide());
min_j = clamp(min_j, ssize_t(0), m_Terrain->GetTilesPerSide());
max_i = clamp(max_i, ssize_t(-1), m_Terrain->GetTilesPerSide()-1);
max_j = clamp(max_j, ssize_t(-1), m_Terrain->GetTilesPerSide()-1);
for (m_j = min_j; m_j <= max_j; ++m_j)
for (m_i = min_i; m_i <= max_i; ++m_i)
ProcessTile(m_i, m_j);
EndRender();
}