Optimize clouds (#25)
Vitaliy
MoNTE48
parent
73392bc567
commit
77d590c58a
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@ -40,6 +40,21 @@ static void cloud_3d_setting_changed(const std::string &settingname, void *data)
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((Clouds *)data)->readSettings();
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}
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static const std::vector<u16> quad_indices = []() {
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int quad_count = 0x10000 / 4; // max number of quads that can be drawn with 16-bit indices
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std::vector<u16> indices;
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indices.reserve(quad_count * 6);
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for (int k = 0; k < quad_count; k++) {
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indices.push_back(4 * k + 0);
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indices.push_back(4 * k + 1);
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indices.push_back(4 * k + 2);
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indices.push_back(4 * k + 2);
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indices.push_back(4 * k + 3);
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indices.push_back(4 * k + 0);
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}
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return indices;
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}();
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Clouds::Clouds(scene::ISceneManager* mgr,
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s32 id,
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u32 seed
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@ -101,8 +116,6 @@ void Clouds::render()
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ScopeProfiler sp(g_profiler, "Clouds::render()", SPT_AVG);
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int num_faces_to_draw = m_enable_3d ? 6 : 1;
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m_material.setFlag(video::EMF_BACK_FACE_CULLING, m_enable_3d);
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driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
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@ -170,10 +183,14 @@ void Clouds::render()
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// Read noise
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std::vector<bool> grid(m_cloud_radius_i * 2 * m_cloud_radius_i * 2);
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std::vector<video::S3DVertex> vertices;
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vertices.reserve(16 * m_cloud_radius_i * m_cloud_radius_i);
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const int grid_length = 2 * m_cloud_radius_i;
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std::vector<bool> grid(grid_length * grid_length);
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auto grid_index = [&] (int x, int z) -> int {
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return (z + m_cloud_radius_i) * grid_length + (x + m_cloud_radius_i);
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};
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auto grid_point = [&] (int x, int z) -> bool {
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return grid[grid_index(x, z)];
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};
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for(s16 zi = -m_cloud_radius_i; zi < m_cloud_radius_i; zi++) {
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u32 si = (zi + m_cloud_radius_i) * m_cloud_radius_i * 2 + m_cloud_radius_i;
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@ -187,147 +204,78 @@ void Clouds::render()
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}
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}
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#define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
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#define INAREA(x, z, radius) \
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((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
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const float rel_y = m_camera_pos.Y - m_params.height * BS;
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const bool draw_top = !m_enable_3d || rel_y >= m_params.thickness * BS;
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const bool draw_bottom = rel_y < 0.0f;
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for (s16 zi0= -m_cloud_radius_i; zi0 < m_cloud_radius_i; zi0++)
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for (s16 xi0= -m_cloud_radius_i; xi0 < m_cloud_radius_i; xi0++)
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const v3f origin = v3f(world_center_of_drawing_in_noise_f.X, m_params.height * BS, world_center_of_drawing_in_noise_f.Y) - intToFloat(m_camera_offset, BS);
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const f32 rx = cloud_size;
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// if clouds are flat, the top layer should be at the given height
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const f32 ry = m_enable_3d ? m_params.thickness * BS : 0.0f;
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const f32 rz = cloud_size;
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// std::vector is great but it is slow
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// reserve+push/insert is slow because extending needs to check vector size
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// resize+direct access is slow because resize initializes the whole vector
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// so... malloc! it can't overflow as there can't be too many faces to draw
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const int max_quads_per_cell = m_enable_3d ? 4 : 1;
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const int max_quad_id = m_enable_3d ? 6 : 1;
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video::S3DVertex *buf = (video::S3DVertex *)malloc(grid.size() * max_quads_per_cell * 4 * sizeof(video::S3DVertex));
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video::S3DVertex *pv = buf;
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const v3f faces[6][4] = {
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{{0, ry, 0}, {0, ry, rz}, {rx, ry, rz}, {rx, ry, 0}}, // top
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{{0, ry, 0}, {rx, ry, 0}, {rx, 0, 0}, {0, 0, 0}}, // back
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{{rx, ry, 0}, {rx, ry, rz}, {rx, 0, rz}, {rx, 0, 0}}, // right
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{{rx, ry, rz}, {0, ry, rz}, {0, 0, rz}, {rx, 0, rz}}, // front
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{{0, ry, rz}, {0, ry, 0}, {0, 0, 0}, {0, 0, rz}}, // left
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{{rx, 0, rz}, {0, 0, rz}, {0, 0, 0}, {rx, 0, 0}}, // bottom
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};
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const v3f normals[6] = {{0, 1, 0}, {0, 0, -1}, {1, 0, 0}, {0, 0, 1}, {-1, 0, 0}, {0, -1, 0}};
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const video::SColor colors[6] = {c_top, c_side_1, c_side_2, c_side_1, c_side_2, c_bottom};
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const v2f tex_coords[4] = {{0, 1}, {1, 1}, {1, 0}, {0, 0}};
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// Draw from back to front for proper transparency
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for (s16 zi0= 1-(int)m_cloud_radius_i; zi0 < m_cloud_radius_i-1; zi0++)
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for (s16 xi0= 1-(int)m_cloud_radius_i; xi0 < m_cloud_radius_i-1; xi0++)
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{
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s16 zi = zi0;
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s16 xi = xi0;
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// Draw from back to front for proper transparency
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if(zi >= 0)
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zi = m_cloud_radius_i - zi - 1;
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if(xi >= 0)
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xi = m_cloud_radius_i - xi - 1;
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if (zi >= 0)
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zi = m_cloud_radius_i - zi - 2;
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if (xi >= 0)
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xi = m_cloud_radius_i - xi - 2;
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u32 i = GETINDEX(xi, zi, m_cloud_radius_i);
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if (!grid[i])
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if (!grid_point(xi, zi))
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continue;
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v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
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video::S3DVertex v[4] = {
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video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
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video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
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video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
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video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
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bool do_draw[6] = {
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draw_top,
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zi > 0 && !grid_point(xi, zi - 1),
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xi < 0 && !grid_point(xi + 1, zi),
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zi < 0 && !grid_point(xi, zi + 1),
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xi > 0 && !grid_point(xi - 1, zi),
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draw_bottom,
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};
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const f32 rx = cloud_size / 2.0f;
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// if clouds are flat, the top layer should be at the given height
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const f32 ry = m_enable_3d ? m_params.thickness * BS : 0.0f;
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const f32 rz = cloud_size / 2;
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for(int i=0; i<num_faces_to_draw; i++)
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{
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switch(i)
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{
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case 0: // top
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for (video::S3DVertex &vertex : v) {
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vertex.Normal.set(0,1,0);
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}
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v[0].Pos.set(-rx, ry,-rz);
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v[1].Pos.set(-rx, ry, rz);
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v[2].Pos.set( rx, ry, rz);
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v[3].Pos.set( rx, ry,-rz);
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break;
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case 1: // back
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if (INAREA(xi, zi - 1, m_cloud_radius_i)) {
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u32 j = GETINDEX(xi, zi - 1, m_cloud_radius_i);
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if(grid[j])
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continue;
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}
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for (video::S3DVertex &vertex : v) {
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vertex.Color = c_side_1;
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vertex.Normal.set(0,0,-1);
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}
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v[0].Pos.set(-rx, ry,-rz);
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v[1].Pos.set( rx, ry,-rz);
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v[2].Pos.set( rx, 0,-rz);
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v[3].Pos.set(-rx, 0,-rz);
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break;
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case 2: //right
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if (INAREA(xi + 1, zi, m_cloud_radius_i)) {
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u32 j = GETINDEX(xi+1, zi, m_cloud_radius_i);
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if(grid[j])
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continue;
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}
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for (video::S3DVertex &vertex : v) {
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vertex.Color = c_side_2;
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vertex.Normal.set(1,0,0);
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}
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v[0].Pos.set( rx, ry,-rz);
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v[1].Pos.set( rx, ry, rz);
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v[2].Pos.set( rx, 0, rz);
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v[3].Pos.set( rx, 0,-rz);
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break;
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case 3: // front
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if (INAREA(xi, zi + 1, m_cloud_radius_i)) {
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u32 j = GETINDEX(xi, zi + 1, m_cloud_radius_i);
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if(grid[j])
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continue;
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}
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for (video::S3DVertex &vertex : v) {
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vertex.Color = c_side_1;
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vertex.Normal.set(0,0,-1);
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}
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v[0].Pos.set( rx, ry, rz);
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v[1].Pos.set(-rx, ry, rz);
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v[2].Pos.set(-rx, 0, rz);
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v[3].Pos.set( rx, 0, rz);
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break;
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case 4: // left
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if (INAREA(xi-1, zi, m_cloud_radius_i)) {
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u32 j = GETINDEX(xi-1, zi, m_cloud_radius_i);
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if(grid[j])
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continue;
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}
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for (video::S3DVertex &vertex : v) {
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vertex.Color = c_side_2;
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vertex.Normal.set(-1,0,0);
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}
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v[0].Pos.set(-rx, ry, rz);
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v[1].Pos.set(-rx, ry,-rz);
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v[2].Pos.set(-rx, 0,-rz);
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v[3].Pos.set(-rx, 0, rz);
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break;
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case 5: // bottom
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for (video::S3DVertex &vertex : v) {
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vertex.Color = c_bottom;
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vertex.Normal.set(0,-1,0);
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}
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v[0].Pos.set( rx, 0, rz);
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v[1].Pos.set(-rx, 0, rz);
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v[2].Pos.set(-rx, 0,-rz);
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v[3].Pos.set( rx, 0,-rz);
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break;
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}
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v3f pos(p0.X, m_params.height * BS, p0.Y);
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pos -= intToFloat(m_camera_offset, BS);
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for (video::S3DVertex &vertex : v) {
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vertex.Pos += pos;
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vertices.push_back(vertex);
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v3f const pos = origin + v3f(xi, 0.0f, zi) * cloud_size;
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for (int i = 0; i < max_quad_id; i++) {
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if (!do_draw[i])
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continue;
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for (int k = 0; k < 4; k++) {
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pv->Pos = pos + faces[i][k];
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pv->Normal = normals[i];
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pv->Color = colors[i];
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pv->TCoords = tex_coords[k];
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pv++;
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}
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}
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}
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int quad_count = vertices.size() / 4;
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std::vector<u16> indices;
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indices.reserve(quad_count * 6);
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for (int k = 0; k < quad_count; k++) {
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indices.push_back(4 * k + 0);
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indices.push_back(4 * k + 1);
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indices.push_back(4 * k + 2);
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indices.push_back(4 * k + 2);
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indices.push_back(4 * k + 3);
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indices.push_back(4 * k + 0);
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}
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driver->drawVertexPrimitiveList(vertices.data(), vertices.size(), indices.data(), 2 * quad_count,
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int vertex_count = pv - buf;
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int quad_count = vertex_count / 4;
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driver->drawVertexPrimitiveList(buf, vertex_count, quad_indices.data(), 2 * quad_count,
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video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
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free(buf);
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// Restore fog settings
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driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
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