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example/q3bsp: first person demo

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This commit is contained in:
Zack Buhman 2025-04-24 19:29:44 -05:00
parent 0156721a6b
commit 3543f57c06
1 changed files with 199 additions and 38 deletions
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237
example/q3bsp.cpp
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@ -133,6 +133,8 @@ struct position_normal {
vec3 normal;
};
static uint8_t face_cache[16384];
static position_normal vertex_cache[16384];
static inline vec3 normal_transform(const mat4x4& trans, vec3 normal)
@ -253,7 +255,7 @@ void transform_vertices(uint8_t * buf, int length, const mat4x4& trans)
//printf("%f %f %f\n", v.x, v.y, v.z);
vertex_cache[i].position = screen_transform(trans * v);
vertex_cache[i].position = trans * v;
vertex_cache[i].normal = normal_transform(trans, n);
}
}
@ -282,6 +284,10 @@ static inline void render_tri_type_2(ta_parameter_writer& writer,
ci);
}
static int type7_tri_count = 0;
static int vis_tri_count = 0;
static int total_tri_count = 0;
static inline void render_tri_type_7(ta_parameter_writer& writer,
vec3 ap,
vec3 bp,
@ -293,6 +299,8 @@ static inline void render_tri_type_7(ta_parameter_writer& writer,
float bi,
float ci)
{
type7_tri_count += 1;
writer.append<ta_vertex_parameter::polygon_type_7>() =
ta_vertex_parameter::polygon_type_7(polygon_vertex_parameter_control_word(false),
ap.x, ap.y, ap.z,
@ -315,6 +323,74 @@ static inline void render_tri_type_7(ta_parameter_writer& writer,
0);
}
static inline void render_clip_tri_type_7(ta_parameter_writer& writer,
vec3 ap,
vec3 bp,
vec3 cp,
vec2 at,
vec2 bt,
vec2 ct,
float li)
{
//return;
const vec3 plane_point = {0.f, 0.f, 1.f};
const vec3 plane_normal = {0.f, 0.f, 1.f};
vec3 preclip_position[] = {ap, bp, cp};
vec2 preclip_texture[] = {at, bt, ct};
vec3 clip_position[4];
vec2 clip_texture[4];
int output_length = geometry::clip_polygon_uv<3>(clip_position,
clip_texture,
plane_point,
plane_normal,
preclip_position,
preclip_texture);
{
vec3 ap;
vec3 bp;
vec3 cp;
vec3 dp;
const vec2& at = clip_texture[0];
const vec2& bt = clip_texture[1];
const vec2& ct = clip_texture[2];
const vec2& dt = clip_texture[3];
if (output_length >= 3) {
ap = screen_transform(clip_position[0]);
bp = screen_transform(clip_position[1]);
cp = screen_transform(clip_position[2]);
render_tri_type_7(writer,
ap,
bp,
cp,
at,
bt,
ct,
li,
li,
li);
}
if (output_length >= 4) {
dp = screen_transform(clip_position[3]);
render_tri_type_7(writer,
ap,
cp,
dp,
at,
ct,
dt,
li,
li,
li);
}
}
}
static inline float inverse_length(vec3 v)
{
float f = dot(v, v);
@ -378,48 +454,53 @@ static inline void transfer_face(ta_parameter_writer& writer, q3bsp_face_t * fac
vec3 bp = vertex_cache[bix].position;
vec3 cp = vertex_cache[cix].position;
if (ap.z < 0 || bp.z < 0 || cp.z < 0) {
vis_tri_count += 1;
if (ap.z < 0 && bp.z < 0 && cp.z < 0) {
continue;
}
vec3 n = vertex_cache[aix].normal;
float li = light_intensity(light_vec, n);
/*
printf("{%f %f %f} {%f %f %f} {%f %f %f}\n",
ap.x, ap.y, ap.z,
bp.x, bp.y, bp.z,
cp.x, cp.y, cp.z);
*/
if (has_texture) {
float v_mul = textures[face->texture].v_mul;
vec2 at = {vert[aix].texcoord[0], vert[aix].texcoord[1] * v_mul};
vec2 bt = {vert[bix].texcoord[0], vert[bix].texcoord[1] * v_mul};
vec2 ct = {vert[cix].texcoord[0], vert[cix].texcoord[1] * v_mul};
//printf("{%f %f} {%f %f} {%f %f}\n", at.x, at.y, bt.x, bt.y, ct.x, ct.y);
if (ap.z < 0 || bp.z < 0 || cp.z < 0) {
render_clip_tri_type_7(writer,
ap,
bp,
cp,
at,
bt,
ct,
li);
render_tri_type_7(writer,
ap,
bp,
cp,
at,
bt,
ct,
} else {
render_tri_type_7(writer,
screen_transform(ap),
screen_transform(bp),
screen_transform(cp),
at,
bt,
ct,
li,
li,
li);
}
} else {
/*
render_tri_type_2(writer,
screen_transform(ap),
screen_transform(bp),
screen_transform(cp),
li,
li,
li);
} else {
/*
render_tri_type_2(writer,
ap,
bp,
cp,
li,
li,
li);
*/
}
}
@ -442,6 +523,26 @@ void transfer_faces(ta_parameter_writer& writer)
}
}
int count_face_triangles()
{
uint8_t * buf = reinterpret_cast<uint8_t *>(&_binary_pk_maps_20kdm2_bsp_start);
q3bsp_header_t * header = reinterpret_cast<q3bsp_header_t *>(buf);
q3bsp_direntry * fe = &header->direntries[LUMP_FACES];
q3bsp_face_t * faces = reinterpret_cast<q3bsp_face_t *>(&buf[fe->offset]);
int face_count = fe->length / (sizeof (struct q3bsp_face));
int sum = 0;
for (int i = 0; i < face_count; i++) {
int triangles = faces[i].n_meshverts / 3;
sum += triangles;
}
return sum;
}
void transfer_icosphere(ta_parameter_writer& writer, const mat4x4& screen_trans)
{
const struct model * model = &icosphere_model;
@ -731,6 +832,39 @@ void render_leaf_ix(ta_parameter_writer& writer)
}
}
void render_num(ta_parameter_writer& writer, int row, char * s, int num, int offset)
{
offset += unparse_base10_unsigned(&s[offset], num, 5, ' ');
font_bitmap::transform_string(writer,
8, 16, // texture
8, 16, // glyph
16 + 50 * 8, // position x
16 + row * 16, // position y
s, offset,
para_control::list_type::opaque);
}
void render_tris_count(ta_parameter_writer& writer)
{
int offset = 18;
{
char s[32] = "total tris: ";
int row = 0;
render_num(writer, row, s, total_tri_count, offset);
}
{
char s[32] = "bsp-visible tris: ";
int row = 1;
render_num(writer, row, s, vis_tri_count, offset);
}
{
char s[32] = "rendered tris: ";
int row = 2;
render_num(writer, row, s, type7_tri_count, offset);
}
}
void render_bounding_box_mm(ta_parameter_writer& writer, const mat4x4& trans, int mins[3], int maxs[3], uint32_t color)
{
vec3 max = {(float)maxs[0], (float)maxs[1], (float)maxs[2]};
@ -806,11 +940,14 @@ void render_leaf_faces(ta_parameter_writer& writer, const mat4x4& trans, q3bsp_l
for (int i = 0; i < leaf->n_leaffaces; i++) {
int face_ix = lf[i].face;
if (face_cache[face_ix] != 0)
continue;
face_cache[face_ix] = 1;
transfer_face(writer, &faces[face_ix], &last_texture);
}
}
void render_sphere_bounding_box(ta_parameter_writer& writer, const mat4x4& trans)
void render_visible_faces(ta_parameter_writer& writer, const mat4x4& trans, const vec3 pos)
{
uint8_t * buf = reinterpret_cast<uint8_t *>(&_binary_pk_maps_20kdm2_bsp_start);
q3bsp_header_t * header = reinterpret_cast<q3bsp_header_t *>(buf);
@ -833,14 +970,14 @@ void render_sphere_bounding_box(ta_parameter_writer& writer, const mat4x4& trans
q3bsp_node_t * new_root = NULL;
if (root->children[0] >= 0) {
q3bsp_node_t * node = &nodes[root->children[0]];
a_inside = vec3_in_bb(sphere_position, node->mins, node->maxs);
a_inside = vec3_in_bb(pos, node->mins, node->maxs);
if (a_inside) {
new_root = node;
}
} else {
int leaf_ix = -(root->children[0] + 1);
q3bsp_leaf_t * leaf = &leafs[leaf_ix];
a_inside = vec3_in_bb(sphere_position, leaf->mins, leaf->maxs);
a_inside = vec3_in_bb(pos, leaf->mins, leaf->maxs);
if (a_inside) {
bb_leaf = leaf;
break;
@ -848,14 +985,14 @@ void render_sphere_bounding_box(ta_parameter_writer& writer, const mat4x4& trans
}
if (root->children[1] >= 0) {
q3bsp_node_t * node = &nodes[root->children[1]];
b_inside = vec3_in_bb(sphere_position, node->mins, node->maxs);
b_inside = vec3_in_bb(pos, node->mins, node->maxs);
if (b_inside) {
new_root = node;
}
} else {
int leaf_ix = -(root->children[1] + 1);
q3bsp_leaf_t * leaf = &leafs[leaf_ix];
b_inside = vec3_in_bb(sphere_position, leaf->mins, leaf->maxs);
b_inside = vec3_in_bb(pos, leaf->mins, leaf->maxs);
if (b_inside) {
bb_leaf = leaf;
break;
@ -883,8 +1020,10 @@ void render_sphere_bounding_box(ta_parameter_writer& writer, const mat4x4& trans
q3bsp_leaf_t * leaf = &leafs[i];
// Cluster x is visible from cluster y if the (1 << y % 8) bit of vecs[x * sz_vecs + y / 8] is set.
/*
if (leaf->mins[2] > 450 && leaf->maxs[2] > 450)
continue;
*/
int y = bb_leaf->cluster;
int x = leaf->cluster;
@ -907,15 +1046,23 @@ void transfer_scene(ta_parameter_writer& writer, const mat4x4& screen_trans, con
q3bsp_direntry * ve = &header->direntries[LUMP_VERTEXES];
transform_vertices(&buf[ve->offset], ve->length, trans);
q3bsp_direntry * fe = &header->direntries[LUMP_FACES];
int face_count = fe->length / (sizeof (struct q3bsp_face));
//transfer_faces(writer);
transfer_icosphere(writer, trans);
render_matrix(writer, screen_trans_inv);
render_leaf_ix(writer);
render_matrix(writer, screen_trans);
//render_leaf_ix(writer);
render_sphere_position(writer);
render_zero_position(writer, screen_trans_inv);
//render_zero_position(writer, screen_trans_inv);
render_sphere_bounding_box(writer, trans);
vec3 pos = screen_trans_inv * (vec3){0, 0, 0};
type7_tri_count = 0;
vis_tri_count = 0;
for (int i = 0; i < face_count; i++) face_cache[i] = 0;
render_visible_faces(writer, trans, pos);
render_tris_count(writer);
writer.append<ta_global_parameter::end_of_list>() =
ta_global_parameter::end_of_list(para_control::para_type::end_of_list);
@ -1035,13 +1182,15 @@ mat4x4 update_analog(const mat4x4& screen)
if (ra && !la) x = -10;
if (la && !ra) x = 10;
float y = -7 * y_;
float z = 0;
if (ua && !da) z = -10;
if (da && !ua) z = 10;
mat4x4 t = {
1, 0, 0, x,
0, 1, 0, 0,
0, 1, 0, y,
0, 0, 1, z,
0, 0, 0, 1,
};
@ -1049,12 +1198,14 @@ mat4x4 update_analog(const mat4x4& screen)
float yt = 0.05f * x_;
float xt = 0.05f * y_;
/*
mat4x4 rx = {
1, 0, 0, 0,
0, cos(xt), -sin(xt), 0,
0, sin(xt), cos(xt), 0,
0, 0, 0, 1,
};
*/
mat4x4 ry = {
cos(yt), 0, sin(yt), 0,
@ -1106,7 +1257,7 @@ mat4x4 update_analog(const mat4x4& screen)
}
}
return rx * ry * t * screen;
return ry * t * screen;
}
void transfer_font()
@ -1125,6 +1276,8 @@ int main()
{
serial::init(0);
total_tri_count = count_face_triangles();
interrupt_init();
transfer_textures();
transfer_font();
@ -1180,12 +1333,20 @@ int main()
int ta = 0;
int core = 0;
mat4x4 trans = {
/*
mat4x4 trans1 = {
1.0, 0.0, 0.000, -1123.0,
0.0, -0.888, -0.458, 859.0,
0.0, 0.458, -0.888, 791.0,
0.0, 0.000, 0.000, 1.0,
};
*/
mat4x4 trans = {
1.0, 0.0, 0.0, -894.0,
0.0, 0.0, -1.0, 451.0,
0.0, 1.0, 0.0, -465.0,
0.0, 0.0, 0.0, 1.0,
};
do_get_condition();