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| author | Dan Goodliffe <dan@randomdan.homeip.net> | 2025-03-07 02:03:21 +0000 |
|---|---|---|
| committer | Dan Goodliffe <dan@randomdan.homeip.net> | 2025-03-11 01:13:59 +0000 |
| commit | 226a1909e727e1a85d2b88e3bdde86cff8cf4653 (patch) | |
| tree | b9443134ae950d9ee90a17f611a2143331583a12 | |
| parent | Add function to test if an AABB is visible in a frustum (diff) | |
| download | ilt-226a1909e727e1a85d2b88e3bdde86cff8cf4653.tar.bz2 ilt-226a1909e727e1a85d2b88e3bdde86cff8cf4653.tar.xz ilt-226a1909e727e1a85d2b88e3bdde86cff8cf4653.zip | |
Only render terrain tiles which are visible in the frustum
| -rw-r--r-- | game/terrain.cpp | 17 | ||||
| -rw-r--r-- | game/terrain.h | 1 |
2 files changed, 14 insertions, 4 deletions
diff --git a/game/terrain.cpp b/game/terrain.cpp index ee7dfa4..9202d20 100644 --- a/game/terrain.cpp +++ b/game/terrain.cpp @@ -1,4 +1,5 @@ #include "terrain.h" +#include "gfx/frustum.h" #include <algorithm> #include <gfx/gl/sceneShader.h> #include <gfx/gl/shadowMapper.h> @@ -13,6 +14,7 @@ #include <vector> static constexpr RGB OPEN_SURFACE {-1}; +static constexpr GlobalDistance TILE_SIZE = 1024 * 1024; // ~1km, power of 2, fast divide template<> VertexArrayObject & @@ -31,8 +33,6 @@ Terrain::SurfaceKey::operator<(const SurfaceKey & other) const void Terrain::generateMeshes() { - constexpr GlobalDistance TILE_SIZE = 1024 * 1024; // ~1km, power of 2, fast divide - std::ranges::transform(all_vertices(), glMappedBufferWriter<Vertex> {GL_ARRAY_BUFFER, verticesBuffer, n_vertices()}, [this](const auto & vertex) { return Vertex {point(vertex), normal(vertex)}; @@ -97,13 +97,22 @@ Terrain::afterChange() } void -Terrain::render(const SceneShader & shader, const Frustum &) const +Terrain::render(const SceneShader & shader, const Frustum & frustum) const { grass->bind(); + + std::ranges::for_each(meshes, [ext = getExtents(), &frustum](const auto & surfaceDef) { + const AxisAlignedBoundingBox tileAabb {{surfaceDef.first.basePosition * TILE_SIZE || ext.min.z}, + {(surfaceDef.first.basePosition + 1) * TILE_SIZE || ext.max.z}}; + surfaceDef.second.visible = frustum.contains(tileAabb); + }); + const auto chunkBySurface = std::views::chunk_by([](const auto & itr1, const auto & itr2) { return itr1.first.surface == itr2.first.surface; }); - for (const auto & surfaceRange : meshes | chunkBySurface) { + for (const auto & surfaceRange : meshes | std::views::filter([](const auto & itr) { + return itr.second.visible; + }) | chunkBySurface) { const auto surface = surfaceRange.front().first.surface; shader.landmass.use(surface ? surface->colorBias : OPEN_SURFACE); for (const auto & sab : surfaceRange) { diff --git a/game/terrain.h b/game/terrain.h index 66887ed..40a5989 100644 --- a/game/terrain.h +++ b/game/terrain.h @@ -35,6 +35,7 @@ private: glVertexArray vertexArray; glBuffer indicesBuffer; GLsizei count; + mutable bool visible; }; struct SurfaceKey { |