You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
3.5 KiB
109 lines
3.5 KiB
#include "common.h"
|
|
#include "world.h"
|
|
#include "display.h"
|
|
|
|
#include <inline_c.h>
|
|
|
|
static CVECTOR colors[] =
|
|
{
|
|
{ 255, 0, 0 },
|
|
{ 0, 255, 0 },
|
|
{ 0, 0, 255 },
|
|
{ 255, 255, 0 },
|
|
{ 255, 0, 255 },
|
|
{ 0, 255, 255 },
|
|
{ 128, 255, 0 },
|
|
{ 255, 128, 0 },
|
|
{ 128, 0, 255 },
|
|
{ 255, 0, 128 },
|
|
{ 0, 128, 255 },
|
|
{ 0, 255, 128 },
|
|
};
|
|
static const int numColors = sizeof(colors) / sizeof(CVECTOR);
|
|
|
|
void world_load(const u_long *data, world_t *world)
|
|
{
|
|
const char *bytes = (const char*)data;
|
|
|
|
world->header = (ps1bsp_header_t*)bytes;
|
|
bytes += sizeof(ps1bsp_header_t);
|
|
|
|
world->vertices = (ps1bsp_vertex_t*)bytes;
|
|
bytes += sizeof(ps1bsp_vertex_t) * world->header->numVertices;
|
|
|
|
world->triangles = (ps1bsp_triangle_t*)bytes;
|
|
bytes += sizeof(ps1bsp_triangle_t) * world->header->numTriangles;
|
|
|
|
world->faces = (ps1bsp_face_t*)bytes;
|
|
bytes += sizeof(ps1bsp_face_t) * world->header->numFaces;
|
|
}
|
|
|
|
void world_draw(const world_t *world)
|
|
{
|
|
int p;
|
|
|
|
// The world doesn't move, so we just set the camera view-projection matrix
|
|
gte_SetRotMatrix(&vp_matrix);
|
|
gte_SetTransMatrix(&vp_matrix);
|
|
|
|
char *scratch = scratchpad;
|
|
SVECTOR *vecs = (SVECTOR*)mem_scratch(&scratch, sizeof(SVECTOR) * 3);
|
|
|
|
for (int faceIdx = 0; faceIdx < world->header->numFaces; ++faceIdx)
|
|
{
|
|
const ps1bsp_face_t *face = &world->faces[faceIdx];
|
|
const CVECTOR *col = &colors[faceIdx % numColors];
|
|
|
|
const ps1bsp_triangle_t *tri = &world->triangles[face->firstTriangleId];
|
|
for (int triangleIdx = 0; triangleIdx < face->numTriangles; ++triangleIdx, ++tri)
|
|
{
|
|
// Naively draw the triangle with GTE, nothing special or optimized about this
|
|
const ps1bsp_vertex_t *v0 = &world->vertices[tri->vertex0];
|
|
const ps1bsp_vertex_t *v1 = &world->vertices[tri->vertex1];
|
|
const ps1bsp_vertex_t *v2 = &world->vertices[tri->vertex2];
|
|
|
|
vecs[0].vx = v0->x; vecs[0].vy = v0->y; vecs[0].vz = v0->z;
|
|
vecs[1].vx = v1->x; vecs[1].vy = v1->y; vecs[1].vz = v1->z;
|
|
vecs[2].vx = v2->x; vecs[2].vy = v2->y; vecs[2].vz = v2->z;
|
|
gte_ldv3c(vecs);
|
|
|
|
// This method *should* work but it doesn't on real hardware, for some reason.
|
|
// Perhaps the PS1 doesn't like loading data from random far-off memory locations directly into GTE registers?
|
|
// We probably want to use the scratchpad memory to prepare the vertex data for the GTE anyway.
|
|
// SVECTOR *v0 = (SVECTOR*)&world->vertices[tri->vertex0];
|
|
// SVECTOR *v1 = (SVECTOR*)&world->vertices[tri->vertex1];
|
|
// SVECTOR *v2 = (SVECTOR*)&world->vertices[tri->vertex2];
|
|
// gte_ldv3(v0, v1, v2);
|
|
|
|
gte_rtpt(); // Rotation, translation, perspective projection
|
|
|
|
// Normal clipping for backface culling
|
|
gte_nclip();
|
|
gte_stopz(&p);
|
|
if (p < 0)
|
|
continue;
|
|
|
|
// Average Z for depth sorting and culling
|
|
gte_avsz3();
|
|
gte_stotz(&p);
|
|
unsigned short depth = p >> 2;
|
|
if (depth <= 0 || depth >= OTLEN)
|
|
continue;
|
|
|
|
// Draw a flat-shaded untextured colored triangle
|
|
POLY_F3 *poly = (POLY_F3*)mem_prim(sizeof(POLY_F3));
|
|
if (poly == NULL)
|
|
break;
|
|
|
|
setPolyF3(poly);
|
|
|
|
gte_stsxy3_f3(poly);
|
|
|
|
poly->r0 = col->r;
|
|
poly->g0 = col->g;
|
|
poly->b0 = col->b;
|
|
|
|
addPrim(curOT + depth, poly);
|
|
}
|
|
}
|
|
}
|