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jni: add GLMatrix proj2d/3d

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This commit is contained in:
Hannes Janetzek
2014-09-19 22:37:39 +02:00
parent c34bc3306c
commit 59ab24da90
4 changed files with 132 additions and 65 deletions
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31
vtm-web/src/org/oscim/gdx/emu/org/oscim/renderer/GLMatrix.java
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@@ -126,6 +126,10 @@ public class GLMatrix {
vec[2] = z;
}
public void prj3D(float[] vec, int offset, int cnt) {
throw new RuntimeException("unimplemented");
}
public void prj2D(float[] vec, int offset, int cnt) {
offset <<= 1;
cnt <<= 1;
@@ -138,6 +142,33 @@ public class GLMatrix {
}
}
/**
* Project Vectors with Matrix
*
*
* @param vec2 Vector to project
*/
public void prj2D(float[] src, int src_offset, float[] dst, int dst_offset, int length) {
if (src == null || src_offset < 0 || length + src_offset * 2 > src.length)
throw new IllegalArgumentException(INVALID_INPUT);
int x = (src_offset << 1);
int y = x + 1;
int end = x + (length << 1);
dst_offset <<= 1;
while (x < end) {
float inv_w = 1.0f / (src[x] * val[M30] + src[y] * val[M31] + val[M33]);
dst[dst_offset++] = (src[x] * val[M00] + src[y] * val[M01] + val[M03]) * inv_w;
dst[dst_offset++] = (src[x] * val[M10] + src[y] * val[M11] + val[M13]) * inv_w;
x += 2;
y += 2;
}
}
/**
* Multiply rhs onto Matrix.
*