Implemented mesh headers
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CobaltXII
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src/inc/mesh.cpp
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src/inc/mesh.cpp
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194
src/inc/mesh.hpp
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194
src/inc/mesh.hpp
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// Convert a subset of a world into a vertex array (also called a mesh). The
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// generated vertex array is stored in target, and it's size (in floats) is
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// stored in target_size_in_floats.
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void world_subset_to_mesh
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(
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world* input,
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unsigned int x,
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unsigned int y,
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unsigned int z,
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unsigned int x_res,
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unsigned int y_res,
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unsigned int z_res,
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float* target,
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unsigned int& target_size_in_floats
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)
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{
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float* ptr = target;
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unsigned int fx = x + x_res;
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unsigned int fy = y + y_res;
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unsigned int fz = z + z_res;
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for (unsigned int cx = x; cx < fx; cx++)
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{
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for (unsigned int cy = y; cy < fy; cy++)
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{
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for (unsigned int cz = z; cz < fz; cz++)
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{
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// Skip voxels that are out of bounds.
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if (!input->in_bounds(cx, cy, cz))
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{
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continue;
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}
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// Get the current voxel's block_id.
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block_id voxel_id = input->get_id(cx, cy, cz);
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// Ignore voxels that have a block_id equivalent to id_air.
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// Voxels that have a block_id equivalent to id_air are fully
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// transparent, and do not need to be rendered.
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if (voxel_id == id_air)
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{
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continue;
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}
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// Get the face_info* object that matches the block_id of the
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// current voxel.
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face_info* cube_face_info = block_face_info[voxel_id];
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// Get the layer index corresponding to each face of the
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// current voxel.
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float layer_top = cube_face_info->l_top;
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float layer_bottom = cube_face_info->l_bottom;
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float layer_left = cube_face_info->l_left;
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float layer_right = cube_face_info->l_right;
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float layer_front = cube_face_info->l_front;
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float layer_back = cube_face_info->l_back;
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// Get the natural and artificial floating-point lighting
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// values of the current voxel.
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float voxel_light_natural = input->get_natural(cx, cy, cz) / 15.0f;
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float voxel_light_artificial = input->get_artificial(cx, cy, cz) / 15.0f;
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// Get the final voxel floating-point lighting value by
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// choosing the largest lighting component of the voxel.
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float voxel_light = std::max(voxel_light_natural, voxel_light_artificial);
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// Calculate the lighting value of each face by multiplying
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// the lighting value of the current voxel by a constant
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// coefficient.
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float lighting_top = 1.0f * voxel_light;
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float lighting_bottom = 0.65f * voxel_light;
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float lighting_left = 0.75f * voxel_light;
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float lighting_right = 0.75f * voxel_light;
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float lighting_front = 0.9f * voxel_light;
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float lighting_back = 0.9f * voxel_light;
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// Do hidden face culling. This optimization will cause faces
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// that are never going to be rendered (hidden faces) to be
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// culled.
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bool visible_top = is_transparent(input->get_id_safe(cx, cy - 1, cz));
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bool visible_bottom = is_transparent(input->get_id_safe(cx, cy + 1, cz));
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bool visible_left = is_transparent(input->get_id_safe(cx - 1, cy, cz));
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bool visible_right = is_transparent(input->get_id_safe(cx + 1, cy, cz));
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bool visible_front = is_transparent(input->get_id_safe(cx, cy, cz - 1));
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bool visible_back = is_transparent(input->get_id_safe(cx, cy, cz + 1));
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// Generate visible faces and write them to the target array,
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// using ptr as a 'stream writer'.
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if (visible_top)
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{
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_top; *(ptr++) = lighting_top;
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 1.0f; *(ptr++) = layer_top; *(ptr++) = lighting_top;
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_top; *(ptr++) = lighting_top;
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_top; *(ptr++) = lighting_top;
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_top; *(ptr++) = lighting_top;
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 0.0f; *(ptr++) = layer_top; *(ptr++) = lighting_top;
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}
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if (visible_bottom)
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{
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_bottom; *(ptr++) = lighting_bottom;
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 1.0f; *(ptr++) = layer_bottom; *(ptr++) = lighting_bottom;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_bottom; *(ptr++) = lighting_bottom;
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_bottom; *(ptr++) = lighting_bottom;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_bottom; *(ptr++) = lighting_bottom;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 0.0f; *(ptr++) = layer_bottom; *(ptr++) = lighting_bottom;
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}
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if (visible_left)
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{
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_left; *(ptr++) = lighting_left;
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 1.0f; *(ptr++) = layer_left; *(ptr++) = lighting_left;
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_left; *(ptr++) = lighting_left;
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_left; *(ptr++) = lighting_left;
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_left; *(ptr++) = lighting_left;
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 0.0f; *(ptr++) = layer_left; *(ptr++) = lighting_left;
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}
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if (visible_right)
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{
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_right; *(ptr++) = lighting_right;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 1.0f; *(ptr++) = layer_right; *(ptr++) = lighting_right;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_right; *(ptr++) = lighting_right;
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_right; *(ptr++) = lighting_right;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_right; *(ptr++) = lighting_right;
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 0.0f; *(ptr++) = layer_right; *(ptr++) = lighting_right;
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}
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if (visible_front)
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{
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_back; *(ptr++) = lighting_back;
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 1.0f; *(ptr++) = layer_back; *(ptr++) = lighting_back;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_back; *(ptr++) = lighting_back;
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_back; *(ptr++) = lighting_back;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_back; *(ptr++) = lighting_back;
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 0.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 0.0f; *(ptr++) = layer_back; *(ptr++) = lighting_back;
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}
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if (visible_back)
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{
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_front; *(ptr++) = lighting_front;
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*(ptr++) = 1.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 1.0f; *(ptr++) = layer_front; *(ptr++) = lighting_front;
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_front; *(ptr++) = lighting_front;
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*(ptr++) = 1.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 1.0f; *(ptr++) = 0.0f; *(ptr++) = layer_front; *(ptr++) = lighting_front;
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*(ptr++) = 0.0f + cx; *(ptr++) = -1.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 1.0f; *(ptr++) = layer_front; *(ptr++) = lighting_front;
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*(ptr++) = 0.0f + cx; *(ptr++) = -0.0f - cy; *(ptr++) = 1.0f + cz; *(ptr++) = 0.0f; *(ptr++) = 0.0f; *(ptr++) = layer_front; *(ptr++) = lighting_front;
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}
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}
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}
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}
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// Calculate the amount of floats that were written to target, and store
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// that value in target_size_in_floats.
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target_size_in_floats = ptr - target;
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}
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