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Diffstat (limited to 'examples/n00bdemo/lightdemo.c')
| -rw-r--r-- | examples/n00bdemo/lightdemo.c | 494 |
1 files changed, 0 insertions, 494 deletions
diff --git a/examples/n00bdemo/lightdemo.c b/examples/n00bdemo/lightdemo.c deleted file mode 100644 index ff858c0..0000000 --- a/examples/n00bdemo/lightdemo.c +++ /dev/null @@ -1,494 +0,0 @@ -#include <string.h> -#include <psxgte.h> -#include <psxgpu.h> -#include <inline_c.h> -#include "disp.h" -#include "smd.h" - -extern MATRIX lgt_colmtx; - -extern SMD *o_world; -extern SMD *o_lightbulb; - -void sort_overlay(int showlotl); - -void lightdemo() { - - /* - The point lighting demo is perhaps the most impressive part of - n00bDEMO. A more streamlined version of this demo where you control - various attributes of the light source such as position, intensity - and color might be made as a dedicated example program in the future. - - The point lighting trick is actually not that too complicated. You - basically calculate the distance and direction vector of two points - which are the light source and the vertex of a polygon. - - Calculating the normal whose result can later be used to calculate - the distance between two points is achieved with: - - vec_dir.vx = lgt_point.vx - pri_vert.vx; - vec_dir.vy = lgt_point.vy - pri_vert.vy; - vec_dir.vz = lgt_point.vz - pri_vert.vz; - - The intensity is calculated with (this might not be accurate but this - is faster than applying a square root): - - i = 4096 - ( ( - (vec_dir.vx*vec_dir.vx) + - (vec_dir.vy*vec_dir.vy) + - (vec_dir.vz*vec_dir.vz) ) >> 7 ); - - // Clip minimum intensity - if( i < 0 ) - i = 0; - - This intensity value is then used to set the color of the light source - through the light color matrix. - - col_mtx.m[0][0] = i; - col_mtx.m[1][0] = i; - col_mtx.m[2][0] = i; - gte_SetColorMatrix( &col_mtx ); - - The direction vector can then be used as the direction of the light - source. It is recommended to normalize it first to prevent possible - overflow related issues. - - VectorNormalS( &vec_dir, &vec_norm ); - - lgt_mtx.m[0][0] = vec_norm.vx; - lgt_mtx.m[0][1] = vec_norm.vy; - lgt_mtx.m[0][2] = vec_norm.vz; - - gte_SetLightMatrix( &lgt_mtx ); - - This operation is then performed for each point of a polygon to - achieve a nice smooth shaded point lighting effect. The macros used - are still the same as doing light source calculation with the GTE - the normal way. - - 3D geometry still requires normal data as with most lighting - processing operations. 'Flat' normals (faces with a single normal - vector) work best on flat surfaces while 'smooth' normals (faces with - normals on each point) work best on round or curved surfaces. - - */ - - int i,p_ang; - - SC_OT s_ot; - - SVECTOR rot; - VECTOR pos; - SMD_PRIM s_pri; - - VECTOR l_point; - SVECTOR nrm; - - MATRIX lmtx,llmtx,omtx; - - SVECTOR orot = { 0 }; - - int timeout = SCENE_TIME; - - - // Set clear color to black - setRGB0( &draw, 0, 0, 0 ); - - // Base values for the environment geometry - setVector( &pos, 0, 0, 600 ); - setVector( &rot, 512, 0, 0 ); - - // Set base tpage value for the SMD drawing routines - smdSetBaseTPage( 0x200 ); - - // Set back or ambient color to black for pure darkness - gte_SetBackColor( 0, 0, 0 ); - - memset( &llmtx, 0, sizeof(MATRIX) ); - - - // demo loop - while( 1 ) { - - char buff[32]; - - RotMatrix( &rot, &mtx ); - TransMatrix( &mtx, &pos ); - - rot.vy += 4; - - gte_SetRotMatrix( &mtx ); - gte_SetTransMatrix( &mtx ); - - - setVector( &l_point, (icos( p_ang )>>2)>>2, -350+(icos( p_ang<<1 )>>4), (isin( p_ang )>>2)>>2 ); - p_ang += 16; - - - // Begin parsing the SMD data of the environment - OpenSMD( o_world ); - - // Prototype point lighting renderer - while( ReadSMD( &s_pri ) ) { - - VECTOR v_dir; - SVECTOR v_nrm; - VECTOR v_sqr; - - int flg; - - if( s_pri.prim_id.texture ) { - - POLY_GT4 *pri; - - // Perform standard rotate, translate and perspective - // transformation of the geometry - pri = (POLY_GT4*)nextpri; - - gte_ldv3( - &o_world->p_verts[s_pri.v0], - &o_world->p_verts[s_pri.v1], - &o_world->p_verts[s_pri.v2] ); - - gte_rtpt(); - - gte_nclip(); // Backface culling - - gte_stopz( &flg ); - - if( flg < 0 ) - continue; - - gte_stsxy3( &pri->x0, &pri->x1, &pri->x2 ); - - gte_ldv0( &o_world->p_verts[s_pri.v3] ); - gte_rtps(); - - gte_avsz4(); // Depth sort - gte_stotz( &flg ); - - if( (flg>>2) >= OT_LEN ) - continue; - - gte_stsxy( &pri->x3 ); - - - // Load base color of polygon to GTE - gte_ldrgb( &s_pri.r0 ); - - // Load normal of polygon - gte_ldv0( &o_world->p_norms[s_pri.n0] ); - - // Calculate the direction between the vertex of the - // polygon and the light source - v_dir.vx = l_point.vx - o_world->p_verts[s_pri.v0].vx; - v_dir.vy = l_point.vy - o_world->p_verts[s_pri.v0].vy; - v_dir.vz = l_point.vz - o_world->p_verts[s_pri.v0].vz; - - // Calculate distance and light intensity using square - i = 4096 - ( ( - (v_dir.vx*v_dir.vx) + - (v_dir.vy*v_dir.vy) + - (v_dir.vz*v_dir.vz) ) >> 7 ); - - // Clip minimum intensity - if( i < 0 ) - i = 0; - - // Set intensity to color matrix - llmtx.m[0][0] = i; - llmtx.m[1][0] = i; - llmtx.m[2][0] = i; - gte_SetColorMatrix( &llmtx ); - - // Normalize light direction and set it to light matrix - VectorNormalS( &v_dir, &v_nrm ); - lmtx.m[0][0] = v_nrm.vx; - lmtx.m[0][1] = v_nrm.vy; - lmtx.m[0][2] = v_nrm.vz; - gte_SetLightMatrix( &lmtx ); - - // Calculate (output is retrieved through gte_strgb) - gte_nccs(); - - - // Repeat process for the next 3 vertices - v_dir.vx = l_point.vx - o_world->p_verts[s_pri.v1].vx; - v_dir.vy = l_point.vy - o_world->p_verts[s_pri.v1].vy; - v_dir.vz = l_point.vz - o_world->p_verts[s_pri.v1].vz; - - i = 4096 - ( ( - (v_dir.vx*v_dir.vx) + - (v_dir.vy*v_dir.vy) + - (v_dir.vz*v_dir.vz) ) >> 7 ); - - if( i < 0 ) - i = 0; - - - llmtx.m[0][0] = i; - llmtx.m[1][0] = i; - llmtx.m[2][0] = i; - - gte_strgb( &pri->r0 ); - - gte_SetColorMatrix( &llmtx ); - VectorNormalS( &v_dir, &v_nrm ); - lmtx.m[0][0] = v_nrm.vx; - lmtx.m[0][1] = v_nrm.vy; - lmtx.m[0][2] = v_nrm.vz; - gte_SetLightMatrix( &lmtx ); - gte_nccs(); - - v_dir.vx = l_point.vx - o_world->p_verts[s_pri.v2].vx; - v_dir.vy = l_point.vy - o_world->p_verts[s_pri.v2].vy; - v_dir.vz = l_point.vz - o_world->p_verts[s_pri.v2].vz; - - i = 4096 - ( ( - (v_dir.vx*v_dir.vx) + - (v_dir.vy*v_dir.vy) + - (v_dir.vz*v_dir.vz) ) >> 7 ); - - if( i < 0 ) - i = 0; - - llmtx.m[0][0] = i; - llmtx.m[1][0] = i; - llmtx.m[2][0] = i; - - gte_strgb( &pri->r1 ); - - gte_SetColorMatrix( &llmtx ); - VectorNormalS( &v_dir, &v_nrm ); - lmtx.m[0][0] = v_nrm.vx; - lmtx.m[0][1] = v_nrm.vy; - lmtx.m[0][2] = v_nrm.vz; - gte_SetLightMatrix( &lmtx ); - gte_nccs(); - - v_dir.vx = l_point.vx - o_world->p_verts[s_pri.v3].vx; - v_dir.vy = l_point.vy - o_world->p_verts[s_pri.v3].vy; - v_dir.vz = l_point.vz - o_world->p_verts[s_pri.v3].vz; - - i = 4096 - ( ( - (v_dir.vx*v_dir.vx) + - (v_dir.vy*v_dir.vy) + - (v_dir.vz*v_dir.vz) ) >> 7 ); - - if( i < 0 ) - i = 0; - - llmtx.m[0][0] = i; - llmtx.m[1][0] = i; - llmtx.m[2][0] = i; - - gte_strgb( &pri->r2 ); - - gte_SetColorMatrix( &llmtx ); - VectorNormalS( &v_dir, &v_nrm ); - lmtx.m[0][0] = v_nrm.vx; - lmtx.m[0][1] = v_nrm.vy; - lmtx.m[0][2] = v_nrm.vz; - gte_SetLightMatrix( &lmtx ); - gte_nccs(); - - setUV4( pri, - s_pri.tu0, s_pri.tv0, - s_pri.tu1, s_pri.tv1, - s_pri.tu2, s_pri.tv2, - s_pri.tu3, s_pri.tv3 ); - - pri->tpage = s_pri.tpage; - pri->clut = s_pri.clut; - - setPolyGT4( pri ); - addPrim( ot[db]+(flg>>2), pri ); - nextpri += sizeof(POLY_GT4); - - gte_strgb( &pri->r3 ); - - } else { - - POLY_G4 *pri; - - pri = (POLY_G4*)nextpri; - - gte_ldv3( - &o_world->p_verts[s_pri.v0], - &o_world->p_verts[s_pri.v1], - &o_world->p_verts[s_pri.v2] ); - - gte_rtpt(); - - gte_nclip(); - - gte_stopz( &flg ); - - if( flg < 0 ) - continue; - - gte_stsxy3( &pri->x0, &pri->x1, &pri->x2 ); - - gte_ldv0( &o_world->p_verts[s_pri.v3] ); - gte_rtps(); - - gte_avsz4(); - gte_stotz( &flg ); - - if( (flg>>2) >= OT_LEN ) - continue; - - gte_stsxy( &pri->x3 ); - - gte_ldrgb( &s_pri.r0 ); - gte_ldv0( &o_world->p_norms[s_pri.n0] ); - - v_dir.vx = l_point.vx - o_world->p_verts[s_pri.v0].vx; - v_dir.vy = l_point.vy - o_world->p_verts[s_pri.v0].vy; - v_dir.vz = l_point.vz - o_world->p_verts[s_pri.v0].vz; - - i = 4096 - ( ( - (v_dir.vx*v_dir.vx) + - (v_dir.vy*v_dir.vy) + - (v_dir.vz*v_dir.vz) ) >> 7 ); - - if( i < 0 ) - i = 0; - - llmtx.m[0][0] = i; - llmtx.m[1][0] = i; - llmtx.m[2][0] = i; - gte_SetColorMatrix( &llmtx ); - VectorNormalS( &v_dir, &v_nrm ); - lmtx.m[0][0] = v_nrm.vx; - lmtx.m[0][1] = v_nrm.vy; - lmtx.m[0][2] = v_nrm.vz; - gte_SetLightMatrix( &lmtx ); - gte_nccs(); - - - v_dir.vx = l_point.vx - o_world->p_verts[s_pri.v1].vx; - v_dir.vy = l_point.vy - o_world->p_verts[s_pri.v1].vy; - v_dir.vz = l_point.vz - o_world->p_verts[s_pri.v1].vz; - - i = 4096 - ( ( - (v_dir.vx*v_dir.vx) + - (v_dir.vy*v_dir.vy) + - (v_dir.vz*v_dir.vz) ) >> 7 ); - - if( i < 0 ) - i = 0; - - llmtx.m[0][0] = i; - llmtx.m[1][0] = i; - llmtx.m[2][0] = i; - - gte_strgb( &pri->r0 ); - - gte_SetColorMatrix( &llmtx ); - VectorNormalS( &v_dir, &v_nrm ); - lmtx.m[0][0] = v_nrm.vx; - lmtx.m[0][1] = v_nrm.vy; - lmtx.m[0][2] = v_nrm.vz; - gte_SetLightMatrix( &lmtx ); - gte_nccs(); - - v_dir.vx = l_point.vx - o_world->p_verts[s_pri.v2].vx; - v_dir.vy = l_point.vy - o_world->p_verts[s_pri.v2].vy; - v_dir.vz = l_point.vz - o_world->p_verts[s_pri.v2].vz; - - i = 4096 - ( ( - (v_dir.vx*v_dir.vx) + - (v_dir.vy*v_dir.vy) + - (v_dir.vz*v_dir.vz) ) >> 7 ); - - if( i < 0 ) - i = 0; - - llmtx.m[0][0] = i; - llmtx.m[1][0] = i; - llmtx.m[2][0] = i; - - gte_strgb( &pri->r1 ); - - gte_SetColorMatrix( &llmtx ); - VectorNormalS( &v_dir, &v_nrm ); - lmtx.m[0][0] = v_nrm.vx; - lmtx.m[0][1] = v_nrm.vy; - lmtx.m[0][2] = v_nrm.vz; - gte_SetLightMatrix( &lmtx ); - gte_nccs(); - - v_dir.vx = l_point.vx - o_world->p_verts[s_pri.v3].vx; - v_dir.vy = l_point.vy - o_world->p_verts[s_pri.v3].vy; - v_dir.vz = l_point.vz - o_world->p_verts[s_pri.v3].vz; - - i = 4096 - ( ( - (v_dir.vx*v_dir.vx) + - (v_dir.vy*v_dir.vy) + - (v_dir.vz*v_dir.vz) ) >> 7 ); - - if( i < 0 ) - i = 0; - - llmtx.m[0][0] = i; - llmtx.m[1][0] = i; - llmtx.m[2][0] = i; - - gte_strgb( &pri->r2 ); - - gte_SetColorMatrix( &llmtx ); - VectorNormalS( &v_dir, &v_nrm ); - lmtx.m[0][0] = v_nrm.vx; - lmtx.m[0][1] = v_nrm.vy; - lmtx.m[0][2] = v_nrm.vz; - gte_SetLightMatrix( &lmtx ); - gte_nccs(); - - setPolyG4( pri ); - addPrim( ot[db]+(flg>>2), pri ); - - nextpri += sizeof(POLY_G4); - - gte_strgb( &pri->r3 ); - - } - - } - - - // Sort the light bulb to represent the position of the light source - orot.vx += 32; - orot.vy += 32; - orot.vz += 32; - - RotMatrix( &orot, &omtx ); - TransMatrix( &omtx, &l_point ); - - CompMatrixLV( &mtx, &omtx, &mtx ); - - gte_SetRotMatrix( &mtx ); - gte_SetTransMatrix( &mtx ); - - s_ot.ot = ot[db]; - s_ot.otlen = OT_LEN; - s_ot.zdiv = 2; - s_ot.zoff = 0; - - nextpri = smdSortModel( &s_ot, nextpri, o_lightbulb ); - - - // Sort overlay and display - sort_overlay( 1 ); - - display(); - - timeout--; - if( timeout < 0 ) - break; - - } - -}
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