void uniqueMap(obj* object) {
int i, j, k;
int vIndices[3], tIndices[3];
for(i = 0; i < object->faceCount; ++i) {
for(j = 0; j < 3; ++j) {
vIndices[j] = object->faces[i][j][0] - 1;
tIndices[j] = object->faces[i][j][1] - 1;
}
for(j = 0; j < 3; ++j) {
vec3 V[3];
vec2 T[3];
for(k = 0; k < 3; ++k) {
V[k] = object->vertices[vIndices[(j+k)%3]];
T[k] = object->textures[tIndices[(j+k)%3]];
}
vec3 edge1 = subV3(V[1], V[0]);
vec3 edge2 = subV3(V[2], V[0]);
vec2 deltaUV1 = subV2(T[1], T[0]);
vec2 deltaUV2 = subV2(T[2], T[0]);
GLfloat f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
vec3 tangent;
tangent.x = f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x);
tangent.y = f * (deltaUV2.y * edge1.y - deltaUV1.y * edge2.y);
tangent.z = f * (deltaUV2.y * edge1.z - deltaUV1.y * edge2.z);
tangent = unit(tangent);
vec3 bitangent;
bitangent.x = f * (-deltaUV2.x * edge1.x + deltaUV1.x * edge2.x);
bitangent.y = f * (-deltaUV2.x * edge1.y + deltaUV1.x * edge2.y);
bitangent.z = f * (-deltaUV2.x * edge1.z + deltaUV1.x * edge2.z);
bitangent = unit(bitangent);
object->tangents[vIndices[j]] = addV3(object->tangents[vIndices[j]], tangent);
object->bitangents[vIndices[j]] = addV3(object->bitangents[vIndices[j]], bitangent);
}
for(j = 0; j < 3; ++j) ++object->shared[vIndices[j]];
}
for(i = 0; i < object->vertexCount; ++i) {
object->tangents[i] = unit(scale(object->tangents[i], 1.0f / object->shared[i]));
object->bitangents[i] = unit(scale(object->bitangents[i], 1.0f / object->shared[i]));
}
}
void
render_hex(v2 hex_pos, uint32_t * pixels, HexShape hexes, v2 window_dimensions_in_pixels, uint32_t color)
{
// TODO: Sub-pixel rendering, instead of flooring
v2 startPos = subV2(hex_pos, floorVf2(hexes.dimensions_in_pixels));
v2 endPos = addV2(hex_pos, floorVf2(hexes.dimensions_in_pixels));
if (startPos.x < 0)
{
startPos.x = 0;
}
else if (startPos.x > window_dimensions_in_pixels.x)
{
startPos.x = window_dimensions_in_pixels.x;
}
if (startPos.y < 0)
{
startPos.y = 0;
}
else if (startPos.y > window_dimensions_in_pixels.y)
{
startPos.y = window_dimensions_in_pixels.y;
}
v2 pos;
for (pos.y = startPos.y;
pos.y < endPos.y;
pos.y++)
{
for (pos.x = startPos.x;
pos.x < endPos.x;
pos.x++)
{
v2 rel_to_hex_pos = subV2(pos, hex_pos);
if (absInt32(rel_to_hex_pos.x) < hexes.radius_in_pixels * (hexes.dimensions_in_pixels.y - absInt32(rel_to_hex_pos.y) * .5f) / hexes.dimensions_in_pixels.y)
{
pixels[v2ToV1(pos, window_dimensions_in_pixels.x)] = color;
}
}
}
}