Vertex transformation done!

Author: Sekqies

src/math/quaternions.ts

@@ -1,8 +1,7 @@
 import { add_vec3, cross, normalize, scalar_mult_vec3 } from "./matrix_operators";
-import { mat4, vec3, vec4 } from "./types";
+import { mat4, vec3, vec4, EPSILON } from "./types";
 
 
-const EPSILON:number = 1e-7;
 
 export function identity_quat():vec4{
     return vec4(0,0,0,1);

src/math/types.ts

@@ -109,3 +109,5 @@ export function mat4(
     m[12] = m30; m[13] = m31; m[14] = m32; m[15] = m33;
     return m as mat4;
 }
+
+export const EPSILON = 1e-6;

src/vertex/primitive_assembler.ts

@@ -0,0 +1,23 @@
+import { mul_mat4, mul_mat4_vec4, scalar_mult_vec3 } from "../math/matrix_operators";
+import { mat4, vec4, vec3, EPSILON, vec2 } from "../math/types";
+
+export function transform_vertex(projection:mat4, view:mat4, model:mat4, vertex:vec3):vec4{
+    const left:mat4 = mul_mat4(projection,view);
+    const right:vec4 = mul_mat4_vec4(model,vec4(vertex[0],vertex[1],vertex[2],1.0));
+    return mul_mat4_vec4(left,right);
+}
+
+export function process_perspective(clip_pos:vec4):vec3|null {
+    const w = clip_pos[3];
+    if (w <= EPSILON){
+        return null;
+    }
+    return scalar_mult_vec3(vec3(clip_pos[0],clip_pos[1],clip_pos[2]),1/w);
+}
+
+export function to_viewport_space(ndc:vec3, width:number, height:number):vec2 {
+    const x = (ndc[0] + 1) * 0.5 * width;
+    const y = (1 - ndc[1]) * 0.5 * height;
+    return vec2(x,y);
+}
+