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152 changes: 48 additions & 104 deletions
152
src/main/java/blockrenderer6343/client/utils/ProjectionUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,117 +1,61 @@ | ||
| package blockrenderer6343.client.utils; | ||
|
|
||
| import java.nio.ByteBuffer; | ||
| import java.nio.ByteOrder; | ||
| import java.nio.FloatBuffer; | ||
| import java.nio.IntBuffer; | ||
|
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| import org.lwjgl.opengl.GL11; | ||
| import org.lwjgl.util.glu.GLU; | ||
| import org.lwjgl.util.vector.Matrix4f; | ||
| import org.lwjgl.util.vector.Vector3f; | ||
| import org.lwjgl.util.vector.Vector4f; | ||
|
|
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| import blockrenderer6343.api.utils.BlockPosition; | ||
| import blockrenderer6343.api.utils.PositionedRect; | ||
|
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| public class ProjectionUtils { | ||
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| private static final FloatBuffer MODELVIEW_MATRIX_BUFFER = ByteBuffer.allocateDirect(16 * 4) | ||
| .order(ByteOrder.nativeOrder()).asFloatBuffer(); | ||
| private static final FloatBuffer PROJECTION_MATRIX_BUFFER = ByteBuffer.allocateDirect(16 * 4) | ||
| .order(ByteOrder.nativeOrder()).asFloatBuffer(); | ||
| private static final IntBuffer VIEWPORT_BUFFER = ByteBuffer.allocateDirect(16 * 4).order(ByteOrder.nativeOrder()) | ||
| .asIntBuffer(); | ||
| protected static final FloatBuffer PIXEL_DEPTH_BUFFER = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()) | ||
| .asFloatBuffer(); | ||
| protected static final FloatBuffer OBJECT_POS_BUFFER = ByteBuffer.allocateDirect(3 * 4) | ||
| .order(ByteOrder.nativeOrder()).asFloatBuffer(); | ||
|
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| public static Vector3f project(BlockPosition pos) { | ||
| // read current rendering parameters | ||
| GL11.glGetFloat(GL11.GL_MODELVIEW_MATRIX, MODELVIEW_MATRIX_BUFFER); | ||
| GL11.glGetFloat(GL11.GL_PROJECTION_MATRIX, PROJECTION_MATRIX_BUFFER); | ||
| GL11.glGetInteger(GL11.GL_VIEWPORT, VIEWPORT_BUFFER); | ||
|
|
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| // rewind buffers after write by OpenGL glGet calls | ||
| MODELVIEW_MATRIX_BUFFER.rewind(); | ||
| PROJECTION_MATRIX_BUFFER.rewind(); | ||
| VIEWPORT_BUFFER.rewind(); | ||
|
|
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| // call gluProject with retrieved parameters | ||
| GLU.gluProject( | ||
| pos.x + 0.5f, | ||
| pos.y + 0.5f, | ||
| pos.z + 0.5f, | ||
| MODELVIEW_MATRIX_BUFFER, | ||
| PROJECTION_MATRIX_BUFFER, | ||
| VIEWPORT_BUFFER, | ||
| OBJECT_POS_BUFFER); | ||
|
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| // rewind buffers after read by gluProject | ||
| VIEWPORT_BUFFER.rewind(); | ||
| PROJECTION_MATRIX_BUFFER.rewind(); | ||
| MODELVIEW_MATRIX_BUFFER.rewind(); | ||
|
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| // rewind buffer after write by gluProject | ||
| OBJECT_POS_BUFFER.rewind(); | ||
|
|
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| // obtain position in Screen | ||
| float winX = OBJECT_POS_BUFFER.get(); | ||
| float winY = OBJECT_POS_BUFFER.get(); | ||
| float winZ = OBJECT_POS_BUFFER.get(); | ||
|
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| // rewind buffer after read | ||
| OBJECT_POS_BUFFER.rewind(); | ||
|
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| return new Vector3f(winX, winY, winZ); | ||
| public static Vector3f unProject(PositionedRect rect, Vector3f eyePos, Vector3f lookat, int mouseX, int mouseY) { | ||
| int width = rect.size.width; | ||
| int height = rect.size.height; | ||
|
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| double aspectRatio = ((double) width / (double) height); | ||
| double fov = ((60 / 2d)) * (Math.PI / 180); | ||
|
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| double a = -((double) (mouseX - rect.position.x) / (double) width - 0.5) * 2; | ||
| double b = -((double) (height - (mouseY - rect.position.y)) / (double) height - 0.5) * 2; | ||
| double tanf = Math.tan(fov); | ||
|
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| Vector3f lookVec = new Vector3f(); | ||
| Vector3f.sub(eyePos, lookat, lookVec); | ||
| float yawn = (float) Math.atan2(lookVec.x, -lookVec.z); | ||
| float pitch = (float) Math.atan2(lookVec.y, Math.sqrt(lookVec.x * lookVec.x + lookVec.z * lookVec.z)); | ||
|
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| Matrix4f rot = new Matrix4f(); | ||
| rot.rotate(yawn, new Vector3f(0, -1, 0)); | ||
| rot.rotate(pitch, new Vector3f(1, 0, 0)); | ||
| Vector4f foward = new Vector4f(0, 0, 1, 0); | ||
| Vector4f up = new Vector4f(0, 1, 0, 0); | ||
| Vector4f left = new Vector4f(1, 0, 0, 0); | ||
| Matrix4f.transform(rot, foward, foward); | ||
| Matrix4f.transform(rot, up, up); | ||
| Matrix4f.transform(rot, left, left); | ||
|
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| Vector3f result = new Vector3f(foward.x, foward.y, foward.z); | ||
| Vector3f.add( | ||
| result, | ||
| new Vector3f( | ||
| (float) (left.x * tanf * aspectRatio * a), | ||
| (float) (left.y * tanf * aspectRatio * a), | ||
| (float) (left.z * tanf * aspectRatio * a)), | ||
| result); | ||
| Vector3f.add( | ||
| result, | ||
| new Vector3f((float) (up.x * tanf * b), (float) (up.y * tanf * b), (float) (up.z * tanf * b)), | ||
| result); | ||
| return normalize(result); | ||
| } | ||
|
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| public static Vector3f unProject(int mouseX, int mouseY) { | ||
| // read depth of pixel under mouse | ||
| GL11.glReadPixels(mouseX, mouseY, 1, 1, GL11.GL_DEPTH_COMPONENT, GL11.GL_FLOAT, PIXEL_DEPTH_BUFFER); | ||
|
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| // rewind buffer after write by glReadPixels | ||
| PIXEL_DEPTH_BUFFER.rewind(); | ||
|
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| // retrieve depth from buffer (0.0-1.0f) | ||
| float pixelDepth = PIXEL_DEPTH_BUFFER.get(); | ||
|
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| // rewind buffer after read | ||
| PIXEL_DEPTH_BUFFER.rewind(); | ||
|
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| // read current rendering parameters | ||
| GL11.glGetFloat(GL11.GL_MODELVIEW_MATRIX, MODELVIEW_MATRIX_BUFFER); | ||
| GL11.glGetFloat(GL11.GL_PROJECTION_MATRIX, PROJECTION_MATRIX_BUFFER); | ||
| GL11.glGetInteger(GL11.GL_VIEWPORT, VIEWPORT_BUFFER); | ||
|
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| // rewind buffers after write by OpenGL glGet calls | ||
| MODELVIEW_MATRIX_BUFFER.rewind(); | ||
| PROJECTION_MATRIX_BUFFER.rewind(); | ||
| VIEWPORT_BUFFER.rewind(); | ||
|
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| // call gluUnProject with retrieved parameters | ||
| GLU.gluUnProject( | ||
| mouseX, | ||
| mouseY, | ||
| pixelDepth, | ||
| MODELVIEW_MATRIX_BUFFER, | ||
| PROJECTION_MATRIX_BUFFER, | ||
| VIEWPORT_BUFFER, | ||
| OBJECT_POS_BUFFER); | ||
|
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| // rewind buffers after read by gluUnProject | ||
| VIEWPORT_BUFFER.rewind(); | ||
| PROJECTION_MATRIX_BUFFER.rewind(); | ||
| MODELVIEW_MATRIX_BUFFER.rewind(); | ||
|
|
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| // rewind buffer after write by gluUnProject | ||
| OBJECT_POS_BUFFER.rewind(); | ||
| public static Vector3f normalize(Vector3f vec) { | ||
| float length = (float) Math.sqrt(vec.x * vec.x + vec.y * vec.y + vec.z * vec.z); | ||
|
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| // obtain absolute position in world | ||
| float posX = OBJECT_POS_BUFFER.get(); | ||
| float posY = OBJECT_POS_BUFFER.get(); | ||
| float posZ = OBJECT_POS_BUFFER.get(); | ||
| vec.x /= length; | ||
| vec.y /= length; | ||
| vec.z /= length; | ||
|
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| // rewind buffer after read | ||
| OBJECT_POS_BUFFER.rewind(); | ||
| return new Vector3f(posX, posY, posZ); | ||
| return vec; | ||
| } | ||
| } |
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