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71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
#include "../Platform/stdafx.h"
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#include "Polygon.h"
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// 4J added for common init code
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void _Polygon::_init(VertexArray vertices) {
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vertexCount = 0;
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_flipNormal = false;
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this->vertices = vertices;
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vertexCount = vertices.length;
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}
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_Polygon::_Polygon(VertexArray vertices) { _init(vertices); }
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_Polygon::_Polygon(VertexArray vertices, int u0, int v0, int u1, int v1,
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float xTexSize, float yTexSize) {
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_init(vertices);
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// 4J - added - don't assume that u1 > u0, v1 > v0
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float us = (u1 > u0) ? (0.1f / xTexSize) : (-0.1f / xTexSize);
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float vs = (v1 > v0) ? (0.1f / yTexSize) : (-0.1f / yTexSize);
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vertices[0] = vertices[0]->remap(u1 / xTexSize - us, v0 / yTexSize + vs);
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vertices[1] = vertices[1]->remap(u0 / xTexSize + us, v0 / yTexSize + vs);
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vertices[2] = vertices[2]->remap(u0 / xTexSize + us, v1 / yTexSize - vs);
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vertices[3] = vertices[3]->remap(u1 / xTexSize - us, v1 / yTexSize - vs);
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}
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_Polygon::_Polygon(VertexArray vertices, float u0, float v0, float u1,
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float v1) {
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_init(vertices);
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vertices[0] = vertices[0]->remap(u1, v0);
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vertices[1] = vertices[1]->remap(u0, v0);
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vertices[2] = vertices[2]->remap(u0, v1);
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vertices[3] = vertices[3]->remap(u1, v1);
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}
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void _Polygon::mirror() {
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VertexArray newVertices = VertexArray(vertices.length);
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for (unsigned int i = 0; i < vertices.length; i++)
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newVertices[i] = vertices[vertices.length - i - 1];
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delete[] vertices.data;
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vertices = newVertices;
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}
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void _Polygon::render(Tesselator* t, float scale) {
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Vec3 v0 = vertices[1]->pos->vectorTo(*vertices[0]->pos);
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Vec3 v1 = vertices[1]->pos->vectorTo(*vertices[2]->pos);
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Vec3 n = v1.cross(v0).normalize();
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t->begin();
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if (_flipNormal) {
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t->normal(-(float)n.x, -(float)n.y, -(float)n.z);
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} else {
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t->normal((float)n.x, (float)n.y, (float)n.z);
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}
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for (int i = 0; i < 4; i++) {
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Vertex* v = vertices[i];
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t->vertexUV((float)(v->pos->x * scale), (float)(v->pos->y * scale),
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(float)(v->pos->z * scale), (float)(v->u), (float)(v->v));
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}
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t->end();
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}
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_Polygon* _Polygon::flipNormal() {
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_flipNormal = true;
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return this;
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}
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