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Extract and render colors for mesh

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This commit is contained in:
Joseph Ferano 2026-03-07 09:50:08 +07:00
parent ef02f61771
commit cffe13054f
1 changed files with 21 additions and 9 deletions
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30
src/nol/core.clj
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@ -1,6 +1,6 @@
(ns nol.core
(:require [clojure.math])
(:import [org.lwjgl.assimp Assimp AIFace AIMaterial AIMesh AIScene AIVector3D]
(:import [org.lwjgl.assimp AIColor4D AIFace AIMaterial AIMaterial$Buffer AIMesh AIScene AIVector3D Assimp]
[org.lwjgl.glfw GLFW GLFWErrorCallbackI GLFWKeyCallbackI]
[org.lwjgl.opengl GL GL11 GL15 GL20 GL33 GL30 GL45]
[org.lwjgl.system MemoryUtil MemoryStack]
@ -62,11 +62,11 @@
(GL20/glUseProgram program)
(let [color-loc (GL20/glGetUniformLocation program "uColor")]
(GL20/glUniform4f color-loc 1.0 0.5 0.2 1.0))
(doseq [m meshes]
(GL30/glBindVertexArray (:vao m))
(GL11/glDrawElements GL11/GL_TRIANGLES (:indices-count m) GL11/GL_UNSIGNED_INT 0))
(doseq [m meshes
:let [[r g b a] (:color (:mesh m))]]
(GL20/glUniform4f color-loc r g b a)
(GL30/glBindVertexArray (:vao m))
(GL11/glDrawElements GL11/GL_TRIANGLES (:indices-count m) GL11/GL_UNSIGNED_INT 0)))
(GL30/glBindVertexArray 0)
(GL20/glUseProgram 0))
@ -86,7 +86,7 @@
(GLFW/glfwWindowHint GLFW/GLFW_CONTEXT_VERSION_MINOR 5)
(GLFW/glfwWindowHint GLFW/GLFW_OPENGL_PROFILE GLFW/GLFW_OPENGL_CORE_PROFILE)
(let [window (GLFW/glfwCreateWindow 1900 #_300 1100 "NOL" MemoryUtil/NULL MemoryUtil/NULL)]
(let [window (GLFW/glfwCreateWindow 960 #_1900 300 #_1100 "NOL" MemoryUtil/NULL MemoryUtil/NULL)]
(when (= window MemoryUtil/NULL)
(GLFW/glfwTerminate)
(throw (RuntimeException. "Failed to create window")))
@ -136,7 +136,12 @@
(defn extract-mesh [^AIScene scene idx]
(let [meshes (.mMeshes scene)]
(let [mesh (AIMesh/create (.get meshes idx))
(let [mesh (AIMesh/create (long (.get meshes idx)))
mat-idx (.mMaterialIndex mesh)
mat-ptr ^long (.get (.mMaterials scene) mat-idx)
material (AIMaterial/create (long mat-ptr))
mat-color (AIColor4D/create)
_ (Assimp/aiGetMaterialColor material Assimp/AI_MATKEY_COLOR_DIFFUSE 0 0 ^AIColor4D mat-color)
verts (.mVertices mesh)
n (.mNumVertices mesh)
vert-arr (float-array (* 3 n))
@ -154,7 +159,11 @@
(aset idx-arr (+ (* i 3) 0) (.get idxs 0))
(aset idx-arr (+ (* i 3) 1) (.get idxs 1))
(aset idx-arr (+ (* i 3) 2) (.get idxs 2))))
{:verts vert-arr :indices idx-arr :mat-idx (.mMaterialIndex mesh)})))
{:verts vert-arr :indices idx-arr :mat-idx (.mMaterialIndex mesh)
:color (let [color [(.r mat-color) (.g mat-color) (.b mat-color) (.a mat-color)]]
(if (= color [1.0 1.0 1.0 1.0])
[(rand) (rand) (rand) 1.0]
color))})))
(defn load-model [path]
(let [flags (bit-or Assimp/aiProcess_Triangulate
@ -181,10 +190,13 @@
(GL45/glVertexArrayAttribBinding vao 0 0)
(GL45/glEnableVertexArrayAttrib vao 0)
{:vbo vbo :vao vao :ebo ebo
:mesh mesh
:indices-count (alength (:indices mesh))})))))
(with-gl
(GL11/glClearColor 0.392 0.584 0.929 1.0))
(with-gl
(GL11/glClearColor 0.0 0.0 0.0 1.0))
(with-gl
(GL45/glNamedBufferSubData (:vbo @state) 0 ^floats (float-array [ 0.0 0.5 0.0