213 lines
7.1 KiB
C
213 lines
7.1 KiB
C
#include "demo3d_bsp_render.h"
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#include <string.h>
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#include "pxl8_gfx3d.h"
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#include "pxl8_log.h"
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#include "pxl8_mem.h"
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#include "pxl8_mesh.h"
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static inline bool demo3d_bsp_get_edge_vertex(const demo3d_bsp* bsp, i32 surfedge_idx, u32* out_vert_idx) {
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if (surfedge_idx >= (i32)bsp->num_surfedges) return false;
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i32 edge_idx = bsp->surfedges[surfedge_idx];
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u32 vertex_index;
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if (edge_idx >= 0) {
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if ((u32)edge_idx >= bsp->num_edges) return false;
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vertex_index = 0;
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} else {
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edge_idx = -edge_idx;
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if ((u32)edge_idx >= bsp->num_edges) return false;
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vertex_index = 1;
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}
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*out_vert_idx = bsp->edges[edge_idx].vertex[vertex_index];
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return *out_vert_idx < bsp->num_vertices;
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}
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static inline bool face_in_frustum(const demo3d_bsp* bsp, u32 face_id, const pxl8_frustum* frustum) {
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const demo3d_bsp_face* face = &bsp->faces[face_id];
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return pxl8_frustum_test_aabb(frustum, face->aabb_min, face->aabb_max);
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}
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static void collect_face_to_mesh(const demo3d_bsp* bsp, const demo3d_bsp_render_state* state,
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u32 face_id, pxl8_mesh* mesh, u8 ambient) {
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const demo3d_bsp_face* face = &bsp->faces[face_id];
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if (face->num_edges < 3) return;
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pxl8_vec3 normal = {0, 1, 0};
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if (face->plane_id < bsp->num_planes) {
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normal = bsp->planes[face->plane_id].normal;
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if (face->side) {
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normal.x = -normal.x;
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normal.y = -normal.y;
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normal.z = -normal.z;
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}
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}
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const pxl8_gfx_material* material = NULL;
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f32 tex_scale = 64.0f;
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if (state && face->material_id < state->num_materials) {
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material = &state->materials[face->material_id];
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}
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pxl8_vec3 u_axis = {1.0f, 0.0f, 0.0f};
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pxl8_vec3 v_axis = {0.0f, 0.0f, 1.0f};
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f32 u_offset = 0.0f, v_offset = 0.0f;
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if (material) {
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u_offset = material->u_offset;
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v_offset = material->v_offset;
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}
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f32 abs_ny = normal.y < 0 ? -normal.y : normal.y;
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if (abs_ny > 0.7f) {
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u_axis = (pxl8_vec3){1.0f, 0.0f, 0.0f};
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v_axis = (pxl8_vec3){0.0f, 0.0f, 1.0f};
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} else {
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f32 abs_nx = normal.x < 0 ? -normal.x : normal.x;
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f32 abs_nz = normal.z < 0 ? -normal.z : normal.z;
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if (abs_nx > abs_nz) {
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u_axis = (pxl8_vec3){0.0f, 0.0f, 1.0f};
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} else {
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u_axis = (pxl8_vec3){1.0f, 0.0f, 0.0f};
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}
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v_axis = (pxl8_vec3){0.0f, 1.0f, 0.0f};
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}
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u16 base_idx = (u16)mesh->vertex_count;
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u32 num_verts = 0;
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for (u32 i = 0; i < face->num_edges && num_verts < 64; i++) {
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u32 edge_i = face->side ? (face->num_edges - 1 - i) : i;
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i32 surfedge_idx = face->first_edge + edge_i;
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u32 vert_idx;
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if (!demo3d_bsp_get_edge_vertex(bsp, surfedge_idx, &vert_idx)) {
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continue;
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}
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pxl8_vec3 pos = bsp->vertices[vert_idx].position;
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f32 u = (pxl8_vec3_dot(pos, u_axis) + u_offset) / tex_scale;
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f32 v = (pxl8_vec3_dot(pos, v_axis) + v_offset) / tex_scale;
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u8 light = 255;
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if (bsp->vertex_lights && vert_idx < bsp->num_vertex_lights) {
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u32 packed = bsp->vertex_lights[vert_idx];
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u8 direct = (packed >> 24) & 0xFF;
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u8 ao = (packed >> 16) & 0xFF;
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f32 combined = (f32)direct + ((f32)ambient / 255.0f) * (f32)ao;
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light = (u8)(combined > 255.0f ? 255.0f : combined);
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}
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pxl8_vertex vtx = {
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.position = pos,
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.normal = normal,
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.u = u,
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.v = v,
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.color = 15,
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.light = light,
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};
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pxl8_mesh_push_vertex(mesh, vtx);
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num_verts++;
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}
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if (num_verts < 3) return;
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for (u32 i = 1; i < num_verts - 1; i++) {
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pxl8_mesh_push_triangle(mesh, base_idx, base_idx + i, base_idx + i + 1);
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}
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}
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demo3d_bsp_render_state* demo3d_bsp_render_state_create(u32 num_faces) {
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demo3d_bsp_render_state* state = pxl8_calloc(1, sizeof(demo3d_bsp_render_state));
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if (!state) return NULL;
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state->num_faces = num_faces;
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if (num_faces > 0) {
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state->render_face_flags = pxl8_calloc(num_faces, 1);
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if (!state->render_face_flags) {
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pxl8_free(state);
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return NULL;
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}
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}
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return state;
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}
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void demo3d_bsp_render_state_destroy(demo3d_bsp_render_state* state) {
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if (!state) return;
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pxl8_free(state->materials);
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pxl8_free(state->render_face_flags);
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pxl8_free(state);
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}
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void demo3d_bsp_render(pxl8_gfx* gfx, const demo3d_bsp* bsp,
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demo3d_bsp_render_state* state,
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const pxl8_gfx_draw_opts* opts) {
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if (!gfx || !bsp || !state || bsp->num_faces == 0) return;
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if (!state->materials || state->num_materials == 0) return;
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if (!state->render_face_flags) return;
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const pxl8_frustum* frustum = pxl8_3d_get_frustum(gfx);
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if (!frustum) return;
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pxl8_mesh* mesh = pxl8_mesh_create(8192, 16384);
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if (!mesh) return;
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u8 ambient = pxl8_gfx_get_ambient(gfx);
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pxl8_mat4 identity = pxl8_mat4_identity();
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for (u32 mat = 0; mat < state->num_materials; mat++) {
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for (u32 face_id = 0; face_id < bsp->num_faces; face_id++) {
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if (!state->render_face_flags[face_id]) continue;
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const demo3d_bsp_face* face = &bsp->faces[face_id];
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if (face->material_id != mat) continue;
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if (!face_in_frustum(bsp, face_id, frustum)) continue;
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collect_face_to_mesh(bsp, state, face_id, mesh, ambient);
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}
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if (mesh->index_count > 0) {
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pxl8_gfx_material mat_copy = state->materials[mat];
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if (state->exterior) mat_copy.double_sided = true;
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pxl8_3d_draw_mesh(gfx, mesh, &identity, &mat_copy, opts);
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pxl8_mesh_clear(mesh);
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}
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}
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pxl8_mesh_destroy(mesh);
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}
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void demo3d_bsp_set_material(demo3d_bsp_render_state* state, u16 material_id, const pxl8_gfx_material* material) {
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if (!state || !material) return;
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if (material_id >= state->num_materials) {
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u32 new_count = material_id + 1;
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pxl8_gfx_material* new_materials = pxl8_realloc(state->materials, new_count * sizeof(pxl8_gfx_material));
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if (!new_materials) return;
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for (u32 i = state->num_materials; i < new_count; i++) {
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memset(&new_materials[i], 0, sizeof(pxl8_gfx_material));
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new_materials[i].u_axis = (pxl8_vec3){1.0f, 0.0f, 0.0f};
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if (i == 0 || i == 2) {
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new_materials[i].v_axis = (pxl8_vec3){0.0f, 0.0f, 1.0f};
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} else {
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new_materials[i].v_axis = (pxl8_vec3){0.0f, 1.0f, 0.0f};
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}
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}
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state->materials = new_materials;
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state->num_materials = new_count;
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}
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pxl8_vec3 u_axis = state->materials[material_id].u_axis;
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pxl8_vec3 v_axis = state->materials[material_id].v_axis;
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f32 u_offset = state->materials[material_id].u_offset;
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f32 v_offset = state->materials[material_id].v_offset;
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state->materials[material_id] = *material;
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state->materials[material_id].u_axis = u_axis;
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state->materials[material_id].v_axis = v_axis;
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state->materials[material_id].u_offset = u_offset;
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state->materials[material_id].v_offset = v_offset;
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}
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