Optimized object update.

j3d/j3d.h

@@ -27,6 +27,14 @@
 #include "joey.h"
 
 
+typedef enum {
+	DIRTYNESS_CLEAN     = 0x00,
+	DIRTYNESS_SCALE     = 0x01,
+	DIRTYNESS_ROTATE    = 0x03,
+	DIRTYNESS_TRANSLATE = 0x07,
+	DIRTYNESS_ALL       = 0xFF
+} j3DirtynessT;
+
 typedef float j3Matrix4x4T[4][4];
 
 typedef struct {
@@ -42,9 +50,12 @@ typedef struct {
 } j3VertexT, j3Vector3DT;
 
 typedef struct {
-	j3VertexT local;     // Original vertex positions
-	j3VertexT world;     // After rotation, scale, translation (in that order)
-	j3VertexT camera;    // Camera space
+	// original -> scaled -> rotated -> translated -> camera
+	j3VertexT original;    // Original vertex positions
+	j3VertexT scaled;      // After scaling
+	j3VertexT rotated;     // After rotation (aka "local")
+	j3VertexT translated;  // After translation (aka "world")
+	j3VertexT camera;      // Camera space
 } j3CoordinatesT;
 
 typedef struct {
@@ -74,9 +85,7 @@ typedef struct {
 	j3VertexT       position;       // Position of object in world
 	j3VertexT       rotation;       // Rotation of object in world
 	j3VertexT       scale;          // Scale of object in world
-	bool            positionDirty;  // Did the position change?
-	bool            rotationDirty;  // Did the rotation change?
-	bool            scaleDirty;     // Did the scale change?
+	j3DirtynessT    howDirty;       // How much do we need to recalculate?
 } j3ObjectT;
 
 typedef struct {

j3d/main.c

@@ -105,9 +105,9 @@ int main(void) {
 			for (y=0; y<world->objects[x].vertexCount; y++) {
 				printf("    Vertex %d:  %f  %f  %f\n",
 					y,
-					(double)world->objects[x].vertices[y].local.x,
-					(double)world->objects[x].vertices[y].local.y,
-					(double)world->objects[x].vertices[y].local.z
+					(double)world->objects[x].vertices[y].original.x,
+					(double)world->objects[x].vertices[y].original.y,
+					(double)world->objects[x].vertices[y].original.z
 				);
 			}
 			printf("  Triangles:  %d\n", world->objects[x].triangleCount);