Engine: Implement skybox

assets/glsl/batch-cubemap.frag

@@ -0,0 +1,49 @@
+#version 450 core
+
+layout(location = 0) out vec4 color;
+
+in vec4 v_color;
+in vec3 v_textureCoordinates;
+in flat float v_textureIndex;
+
+uniform samplerCube u_textures[32];
+
+void main()
+{
+	vec4 textureColor = v_color;
+	switch(int(v_textureIndex)) {
+		case 0:  break; // Texture unit 0 is reserved for no texture
+		case 1:  textureColor *= texture(u_textures[1],  v_textureCoordinates); break;
+		case 2:  textureColor *= texture(u_textures[2],  v_textureCoordinates); break;
+		case 3:  textureColor *= texture(u_textures[3],  v_textureCoordinates); break;
+		case 4:  textureColor *= texture(u_textures[4],  v_textureCoordinates); break;
+		case 5:  textureColor *= texture(u_textures[5],  v_textureCoordinates); break;
+		case 6:  textureColor *= texture(u_textures[6],  v_textureCoordinates); break;
+		case 7:  textureColor *= texture(u_textures[7],  v_textureCoordinates); break;
+		case 8:  textureColor *= texture(u_textures[8],  v_textureCoordinates); break;
+		case 9:  textureColor *= texture(u_textures[9],  v_textureCoordinates); break;
+		case 10: textureColor *= texture(u_textures[10], v_textureCoordinates); break;
+		case 11: textureColor *= texture(u_textures[11], v_textureCoordinates); break;
+		case 12: textureColor *= texture(u_textures[12], v_textureCoordinates); break;
+		case 13: textureColor *= texture(u_textures[13], v_textureCoordinates); break;
+		case 14: textureColor *= texture(u_textures[14], v_textureCoordinates); break;
+		case 15: textureColor *= texture(u_textures[15], v_textureCoordinates); break;
+		case 16: textureColor *= texture(u_textures[16], v_textureCoordinates); break;
+		case 17: textureColor *= texture(u_textures[17], v_textureCoordinates); break;
+		case 18: textureColor *= texture(u_textures[18], v_textureCoordinates); break;
+		case 19: textureColor *= texture(u_textures[19], v_textureCoordinates); break;
+		case 20: textureColor *= texture(u_textures[20], v_textureCoordinates); break;
+		case 21: textureColor *= texture(u_textures[21], v_textureCoordinates); break;
+		case 22: textureColor *= texture(u_textures[22], v_textureCoordinates); break;
+		case 23: textureColor *= texture(u_textures[23], v_textureCoordinates); break;
+		case 24: textureColor *= texture(u_textures[24], v_textureCoordinates); break;
+		case 25: textureColor *= texture(u_textures[25], v_textureCoordinates); break;
+		case 26: textureColor *= texture(u_textures[26], v_textureCoordinates); break;
+		case 27: textureColor *= texture(u_textures[27], v_textureCoordinates); break;
+		case 28: textureColor *= texture(u_textures[28], v_textureCoordinates); break;
+		case 29: textureColor *= texture(u_textures[29], v_textureCoordinates); break;
+		case 30: textureColor *= texture(u_textures[30], v_textureCoordinates); break;
+		case 31: textureColor *= texture(u_textures[31], v_textureCoordinates); break;
+	}
+	color = textureColor;
+}

assets/glsl/batch-cubemap.vert

@@ -0,0 +1,20 @@
+#version 450 core
+
+layout(location = 0) in vec3 a_position;
+layout(location = 1) in vec4 a_color;
+layout(location = 2) in float a_textureIndex;
+
+out vec4 v_color;
+out vec3 v_textureCoordinates;
+out flat float v_textureIndex;
+
+uniform mat4 u_projectionView;
+
+void main()
+{
+	v_color = a_color;
+	v_textureCoordinates = a_position;
+	v_textureIndex = a_textureIndex;
+	// Vclip = Camera projection * Camera view * Model transform * Vlocal
+	gl_Position = u_projectionView * vec4(a_position, 1.0f);
+}

assets/scene/scene1.json

@@ -14,6 +14,19 @@
 				{ "path": "assets/lua/cameracontroller.lua" }
 			]
 		},
+		{
+			"id": { "id": 212563732 },
+			"tag": { "tag": "Skybox" },
+			"transform" : {
+				"translate": [0.0, 0.0, 0.0],
+				"rotate": [0.0, 0.0, 0.0],
+				"scale": [100.0, 100.0, 100.0]
+			},
+			"cubemap": {
+				"color": [ 1.0, 1.0, 1.0, 1.0 ],
+				"texture": "assets/gfx/skybox.jpg"
+			}
+		},
 		{
 			"id": { "id": 564564564 },
 			"tag": { "tag": "Quad" },