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OpenGL2: Calculate bitangent in shader, and store normal/tangent as normalized byte arrays.

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This commit is contained in:
SmileTheory 2013-11-12 19:21:51 -08:00
parent a53e7c3074
commit 6e5f8cc918
15 changed files with 268 additions and 271 deletions
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25
code/renderergl2/tr_main.c
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@ -454,6 +454,8 @@ qboolean R_CalcTangentVectors(srfVert_t * dv[3])
/* do each vertex */
for(i = 0; i < 3; i++)
{
vec3_t bitangent, nxt;
// calculate s tangent vector
s = dv[i]->st[0] + 10.0f;
t = dv[i]->st[1];
@ -475,12 +477,16 @@ qboolean R_CalcTangentVectors(srfVert_t * dv[3])
bary[1] = ((dv[2]->st[0] - s) * (dv[0]->st[1] - t) - (dv[0]->st[0] - s) * (dv[2]->st[1] - t)) / bb;
bary[2] = ((dv[0]->st[0] - s) * (dv[1]->st[1] - t) - (dv[1]->st[0] - s) * (dv[0]->st[1] - t)) / bb;
dv[i]->bitangent[0] = bary[0] * dv[0]->xyz[0] + bary[1] * dv[1]->xyz[0] + bary[2] * dv[2]->xyz[0];
dv[i]->bitangent[1] = bary[0] * dv[0]->xyz[1] + bary[1] * dv[1]->xyz[1] + bary[2] * dv[2]->xyz[1];
dv[i]->bitangent[2] = bary[0] * dv[0]->xyz[2] + bary[1] * dv[1]->xyz[2] + bary[2] * dv[2]->xyz[2];
bitangent[0] = bary[0] * dv[0]->xyz[0] + bary[1] * dv[1]->xyz[0] + bary[2] * dv[2]->xyz[0];
bitangent[1] = bary[0] * dv[0]->xyz[1] + bary[1] * dv[1]->xyz[1] + bary[2] * dv[2]->xyz[1];
bitangent[2] = bary[0] * dv[0]->xyz[2] + bary[1] * dv[1]->xyz[2] + bary[2] * dv[2]->xyz[2];
VectorSubtract(dv[i]->bitangent, dv[i]->xyz, dv[i]->bitangent);
VectorNormalize(dv[i]->bitangent);
VectorSubtract(bitangent, dv[i]->xyz, bitangent);
VectorNormalize(bitangent);
// store bitangent handedness
CrossProduct(dv[i]->normal, dv[i]->tangent, nxt);
dv[i]->tangent[3] = (DotProduct(nxt, bitangent) < 0.0f) ? -1.0f : 1.0f;
// debug code
//% Sys_FPrintf( SYS_VRB, "%d S: (%f %f %f) T: (%f %f %f)\n", i,
@ -1556,7 +1562,8 @@ static qboolean SurfIsOffscreen( const drawSurf_t *drawSurf, vec4_t clipDest[128
for ( i = 0; i < tess.numIndexes; i += 3 )
{
vec3_t normal;
vec3_t normal, tNormal;
float len;
VectorSubtract( tess.xyz[tess.indexes[i]], tr.viewParms.or.origin, normal );
@ -1567,7 +1574,11 @@ static qboolean SurfIsOffscreen( const drawSurf_t *drawSurf, vec4_t clipDest[128
shortest = len;
}
if ( DotProduct( normal, tess.normal[tess.indexes[i]] ) >= 0 )
tNormal[0] = tess.normal[tess.indexes[i]][0] / 127.5f - 1.0f;
tNormal[1] = tess.normal[tess.indexes[i]][1] / 127.5f - 1.0f;
tNormal[2] = tess.normal[tess.indexes[i]][2] / 127.5f - 1.0f;
if ( DotProduct( normal, tNormal ) >= 0 )
{
numTriangles--;
}