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Lephisto/src/sbre/brender.cpp

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C++
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#include <SDL_opengl.h>
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include "sbre.h"
#include "sbre_int.h"
#include "sbre_models.h"
float ResolveAnim(ObjParams* pObjParam, uint16 type) {
const AnimFunc* pFunc = pAFunc+type;
float anim = pObjParam->pAnim[pFunc->src];
anim = anim*anim*anim*pFunc->order3 + anim*anim*pFunc->order2
+ anim*pFunc->order1 + pFunc->order0;
if(pFunc->mod == AMOD_REF) {
anim = fmod(anim, 2.002f);
if(anim > 1.0f) anim = 2.002f - anim;
} else if(pFunc->mod == AMOD_MOD1) anim = fmod(anim, 1.001f);
if(anim < 0.0f) anim = 0.0f;
if(anim > 1.0f) anim = 1.0f;
return anim;
}
static Vector pUnitVec[6] = {
{ 1.0f, 0.0f, 0.0f }, { 0.0f, 1.0f, 0.0f }, { 0.0f, 0.0f, 1.0f },
{ -1.0f, 0.0f, 0.0f }, { 0.0f, -1.0f, 0.0f }, { 0.0f, 0.0f, -1.0f },
};
static void ResolveVertices(Model* pMod, Vector* pRes, ObjParams* pObjParam) {
Vector* pCur = pRes;
Vector tv1, tv2, xax, yax;
float anim;
int i; for(i=0; i < 6; i++) *(pCur++) = pUnitVec[i];
PlainVertex* pPVtx = pMod->pPVtx;
for(i = 0; i < pMod->numPVtx-6; i++, pCur++, pPVtx++) {
switch(pPVtx->type) {
case VTYPE_PLAIN: *pCur = pPVtx->pos; break;
case VTYPE_DIR: VecNorm(&pPVtx->pos, pCur); break;
}
}
pCur = pRes + pMod->cvStart;
CompoundVertex* pCVtx = pMod->pCVtx;
for(i = 0; i < pMod->numCVtx; i++, pCur++, pCVtx++) {
switch(pCVtx->type) {
case VTYPE_NORM:
VecSub(pRes+pCVtx->pParam[2], pRes+pCVtx->pParam[1], &tv1);
VecSub(pRes+pCVtx->pParam[0], pRes+pCVtx->pParam[1], &tv2);
VecCross(&tv1, &tv2, pCur);
VecNorm(pCur, pCur);
break;
case VTYPE_CROSS:
VecCross(pRes+pCVtx->pParam[0], pRes+pCVtx->pParam[1], pCur);
VecNorm(pCur, pCur);
break;
case VTYPE_ANIMLIN:
anim = ResolveAnim(pObjParam, pCVtx->pParam[4]);
*pCur = pRes[pCVtx->pParam[0]];
VecSub(pRes+pCVtx->pParam[1], pCur, &tv1);
VecMul(&tv1, anim, &tv1);
VecAdd(&tv1, pCur, pCur);
break;
case VTYPE_ANIMCUBIC:
anim = ResolveAnim(pObjParam, pCVtx->pParam[4]);
ResolveCubicSpline(pRes+pCVtx->pParam[0], pRes+pCVtx->pParam[1],
pRes+pCVtx->pParam[2], pRes+pCVtx->pParam[3], anim, pCur);
break;
case VTYPE_ANIMHERM:
anim = ResolveAnim(pObjParam, pCVtx->pParam[4]);
ResolveHermiteSpline(pRes+pCVtx->pParam[0], pRes+pCVtx->pParam[1],
pRes+pCVtx->pParam[2], pRes+pCVtx->pParam[3], anim, pCur);
break;
case VTYPE_ANIMROTATE:
anim = ResolveAnim(pObjParam, pCVtx->pParam[4]) * 2.0f * 3.141592f;
xax = pRes[pCVtx->pParam[1]];
VecCross(pRes+pCVtx->pParam[0], &xax, &yax);
VecMul(&xax, sin(anim), &tv1);
VecMul(&yax, cos(anim), &tv2);
VecAdd(&tv1, &tv2, pCur);
break;
default: *pCur = zero_vector; break;
}
}
}
static float g_dn, g_df, g_sd;
static int g_wireframe = 0;
void sbreSetViewport(int w, int h, float d, float zn, float zf, float dn, float df) {
glViewport(0, 0, w, h);
float pProjMat[16] = { 1.0f, 0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 0.0f };
pProjMat[ 0] = (2.0f*d)/w;
pProjMat[ 5] = (2.0f*d)/h;
pProjMat[10] = (zf+zn)/(zf-zn);
pProjMat[14] = (-2.0f*zn*zf)/(zf-zn);
glMatrixMode(GL_PROJECTION);
glLoadMatrixf(pProjMat);
glDepthRange(dn+SBRE_ZBIAS, df);
g_dn = dn; g_df = df; g_sd = d;
}
void sbreSetDirLight(float* pColor, float* pDir) {
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
float pColor4[4] = { 0, 0, 0, 1.0f };
float pDir4[4] = { pDir[0], pDir[1], pDir[2], 0.0f };
for(int i = 0; i < 3; i++) pColor4[i] = SBRE_AMB + pColor[i] * (1.0f-SBRE_AMB);
glEnable(GL_LIGHT0);
glLightfv(GL_LIGHT0, GL_POSITION, pDir4);
glLightfv(GL_LIGHT0, GL_DIFFUSE, pColor4);
glLightfv(GL_LIGHT0, GL_SPECULAR, pColor4);
}
void sbreSetWireframe(int val) {
g_wireframe = val;
}
void SetGeneralState(void) {
float ambient[4] = { SBRE_AMB, SBRE_AMB, SBRE_AMB, 1.0f };
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
glDisable(GL_TEXTURE_2D);
glFrontFace(GL_CW);
glEnable(GL_DEPTH_TEST);
if(g_wireframe) {
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glDisable(GL_CULL_FACE);
} else {
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glEnable(GL_CULL_FACE);
}
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
}
void SetOpaqueState(void) {
glDisable(GL_BLEND);
glEnable(GL_LIGHTING);
glEnable(GL_NORMALIZE);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
}
void SetTransState(void) {
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_LIGHTING);
glDisable(GL_NORMALIZE);
glEnableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
}
void AllocModelCaches(Model* pModel) {
pModel->pNumVtx = (int*)calloc(pModel->numCache, sizeof(int));
pModel->pNumIdx = (int*)calloc(pModel->numCache, sizeof(int));
pModel->ppVCache = (Vector**)calloc(pModel->numCache, sizeof(Vector*));
pModel->ppICache = (uint16**)calloc(pModel->numCache, sizeof(uint16*));
}
void sbreRenderModel(Vector* pPos, Matrix* pOrient, int model, ObjParams* pParam,
float s, Vector* pCompos) {
Model* pModel = ppModel[model];
s *= pModel->scale;
float pMV[16];
pMV[ 0] = s*pOrient->x1; pMV[1] = s*pOrient->y1; pMV[ 2] = s*pOrient->z1; pMV[ 3] = 0.0f;
pMV[ 4] = s*pOrient->x2; pMV[5] = s*pOrient->y2; pMV[ 6] = s*pOrient->z2; pMV[ 7] = 0.0f;
pMV[ 8] = s*pOrient->x3; pMV[9] = s*pOrient->y3; pMV[10] = s*pOrient->z3; pMV[11] = 0.0f;
pMV[12] = pPos->x; pMV[13] = pPos->y; pMV[14] = pPos->z; pMV[15] = 1.0f;
glMatrixMode(GL_MODELVIEW);
glLoadMatrixf(pMV);
Vector* pVtx = (Vector*)alloca(sizeof(Vector)*(pModel->cvStart+pModel->numCVtx));
ResolveVertices(pModel, pVtx, pParam);
RState rstate;
rstate.pVtx = pVtx;
rstate.objpos = *pPos;
rstate.objorient = *pOrient;
rstate.scale = s;
rstate.pModel = pModel;
rstate.pObjParam = pParam;
rstate.dn = g_dn;
rstate.df = g_df;
MatTVecMult(pOrient, pPos, &rstate.campos);
VecInv(&rstate.campos, &rstate.campos);
if(pCompos) rstate.compos = *pCompos;
else rstate.compos = zero_vector;
rstate.pCallback = 0;
if(pModel->numCache && !pModel->ppVCache)AllocModelCaches(pModel);
SetGeneralState();
SetOpaqueState();
/* Find suitable LOD. */
float dist = sqrt(VecDot(pPos, pPos));
float pixrad = g_sd * pModel->radius*s / dist;
int i; for(i = 0; i < 4; i++) {
if(pModel->pLOD[i].pixrad <= 0.0f) break;
if(pixrad <= pModel->pLOD[i].pixrad) break;
}
uint16* pData = pModel->pLOD[i].pData1;
if(pData) while(*pData != PTYPE_END) {
pData += pPrimFuncTable[*pData & 0xff] (pData, pModel, &rstate);
}
pData = pModel->pLOD[i].pData2;
if(pData) while(*pData != PTYPE_END) {
pData += pPrimFuncTable[*pData & 0xff] (pData, pModel, &rstate);
}
//glDepthRange(g_dn+SBRE_ZBIAS, g_df);
if(pModel->pLOD[i].numThrusters) {
SetTransState();
RenderThrusters(&rstate, pModel->pLOD[i].numThrusters, pModel->pLOD[i].pThruster);
}
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glEnable(GL_CULL_FACE);
}
void sbreGenCollMesh(CollMesh* pCMesh, int model, ObjParams* pParam, float s) {
pCMesh->cflag = pCMesh->nv = pCMesh->ni = 0;
Vector pos = zero_vector; Matrix orient = identity_matrix;
GenCollMeshInternal(&pos, &orient, model, pParam, s, pCMesh);
}
void GenCollMeshInternal(Vector* pPos, Matrix* pOrient, int model, ObjParams* pParam,
float s, CollMesh* pCMesh) {
Model* pModel = ppModel[model];
s *= pModel->scale;
Matrix m = *pOrient;
m.x1 *= s; m.x2 *= s; m.x3 *= s;
m.y1 *= s; m.y2 *= s; m.y3 *= s;
m.z1 *= s; m.z2 *= s; m.z3 *= s;
Vector* pVtx = (Vector*)alloca(sizeof(Vector)*(pModel->cvStart+pModel->numCVtx));
ResolveVertices(pModel, pVtx, pParam);
for(int i = 6; i < pModel->cvStart+pModel->numCVtx; i++) {
Vector tv;
MatVecMult(&m, pVtx+i, &tv);
VecAdd(&tv, pPos, pVtx+i);
if(i == pModel->numPVtx-1) i = pModel->cvStart-1;
}
RState rstate;
rstate.pVtx = pVtx;
rstate.objpos = *pPos;
rstate.objorient = *pOrient;
rstate.scale = s;
rstate.pModel = pModel;
rstate.pObjParam = pParam;
MatTVecMult(pOrient, pPos, &rstate.campos);
VecInv(&rstate.campos, &rstate.campos);
rstate.pCMesh = pCMesh;
if(pModel->numCache && !pModel->ppVCache) AllocModelCaches(pModel);
uint16* pData = pModel->pLOD[0].pData1;
if(pData) while(*pData != PTYPE_END) {
pData += pCollFuncTable[*pData & 0xff](pData, pModel, &rstate);
}
pData = pModel->pLOD[0].pData2;
if(pData) while(*pData != PTYPE_END) {
pData += pCollFuncTable[*pData & 0xff](pData, pModel, &rstate);
}
}
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