MMPC/Alternativa3D
3
0
Fork 0
mirror of https://github.com/MapMakersAndProgrammers/Alternativa3D.git synced 2025-10-27 02:19:11 -07:00
Code Issues Packages Projects Releases Wiki Activity

Decal: Fixed incorrect drawing with extremaly low nearClipping.

Browse Source
This commit is contained in:
Yaski
2012-06-15 22:05:14 +06:00
parent cb78f0a87d
commit 3cb369b388
1 changed files with 24 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
src/alternativa/engine3d/objects/Decal.as
View File

@@ -32,35 +32,34 @@ package alternativa.engine3d.objects {
* </listing>
*/
public class Decal extends Mesh {
static private var transformProcedureStatic:Procedure = new Procedure([
// Z in a camera
"dp4 t0.z, i0, c0",
// delta calculates with z*z/(zNear*(1<<N) - z)
"mul t0.x, t0.z, t0.z",
"sub t0.y, c1.w, t0.z",
"div t0.x, t0.x, t0.y",
// Corrected Z
"sub t0.y, t0.z, t0.x",
// Correction coefficient
"div t0.w, t0.y, t0.z",
// Vector from a camera to vertex
"sub t0.xyz, i0.xyz, c1.xyz",
// Correction of the vector
"mul t0.xyz, t0.xyz, t0.w",
// Get position with offset
"add o0.xyz, c1.xyz, t0.xyz",
"mov o0.w, i0.w",
// Declaring
"#c0=cTrm", // Thrin line of the transforming to camera matrix
"#c1=cCam" // Camera position in object space, w = 1 - offset/(far - near)
], "DecalTransformProcedure");
/**
* Z-buffer precision in bytes.
*/
static public var zBufferPrecision:int = 16;
static private var transformProcedureStatic:Procedure = new Procedure([
// Z in a camera
"dp4 t0.z, i0, c0",
// z = m14/(m14/z + 1/N)
"div t0.x, c2.z, t0.z", // t0.x = m14/t0.z
"sub t0.x, t0.x, c2.w", // t0.x = t0.x + 1/N
"div t0.y, c2.z, t0.x", // t0.y = m14/t0.x
// Correction coefficient
"div t0.w, t0.y, t0.z", // t0.w = t0.y / t0.z
// Vector from a camera to vertex
"sub t0.xyz, i0.xyz, c1.xyz", // t0.xyz = i0.xyz - c1.xyz
// Correction of the vector
"mul t0.xyz, t0.xyz, t0.w", // t0.xyz = t0.xyz*t0.w
// Get new position
"add o0.xyz, c1.xyz, t0.xyz", //o0.xyz = c1.xyz + t0.xyz
"mov o0.w, i0.w", // o0.w = i0.w
// Declaring
"#c0=cTrm", // Third line of the transforming to camera matrix
"#c1=cCam", // Camera position in object space, w = 1 - offset/(far - near)
"#c2=cProj" // Camera projection matrix settings
], "DecalTransformProcedure");
/**
* Creates a new Decal instance.
*/
@@ -84,7 +83,8 @@ package alternativa.engine3d.objects {
* @private
*/
override alternativa3d function setTransformConstants(drawUnit:DrawUnit, surface:Surface, vertexShader:Linker, camera:Camera3D):void {
drawUnit.setVertexConstantsFromNumbers(vertexShader.getVariableIndex("cCam"), cameraToLocalTransform.d, cameraToLocalTransform.h, cameraToLocalTransform.l, camera.nearClipping*(1 << zBufferPrecision));
drawUnit.setVertexConstantsFromNumbers(vertexShader.getVariableIndex("cProj"), 0, 0, camera.m14, 1/(1 << zBufferPrecision));
drawUnit.setVertexConstantsFromNumbers(vertexShader.getVariableIndex("cCam"), cameraToLocalTransform.d, cameraToLocalTransform.h, cameraToLocalTransform.l);
drawUnit.setVertexConstantsFromNumbers(vertexShader.getVariableIndex("cTrm"), localToCameraTransform.i, localToCameraTransform.j, localToCameraTransform.k, localToCameraTransform.l);
}