init

shaders/instancing/glsl/instancing.vert

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+#version 450
+/* Copyright (c) 2019-2024, Sascha Willems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+precision highp float;
+
+// Vertex attributes
+layout (location = 0) in vec3 inPos;
+layout (location = 1) in vec3 inNormal;
+layout (location = 2) in vec2 inUV;
+
+// Instanced attributes
+layout (location = 3) in vec3 instancePos;
+layout (location = 4) in vec3 instanceRot;
+layout (location = 5) in float instanceScale;
+layout (location = 6) in int instanceTexIndex;
+
+layout (binding = 0) uniform UBO 
+{
+	mat4 projection;
+	mat4 modelview;
+	vec4 lightPos;
+	float locSpeed;
+	float globSpeed;
+} ubo;
+
+layout (location = 0) out vec3 outNormal;
+layout (location = 1) out vec3 outColor;
+layout (location = 2) out vec3 outUV;
+layout (location = 3) out vec3 outViewVec;
+layout (location = 4) out vec3 outLightVec;
+
+void main() 
+{
+	outColor = vec3(1.0);
+	outUV = vec3(inUV, instanceTexIndex);
+
+	mat3 mx, my, mz;
+	
+	// rotate around x
+	float s = sin(instanceRot.x + ubo.locSpeed);
+	float c = cos(instanceRot.x + ubo.locSpeed);
+
+	mx[0] = vec3(c, s, 0.0);
+	mx[1] = vec3(-s, c, 0.0);
+	mx[2] = vec3(0.0, 0.0, 1.0);
+	
+	// rotate around y
+	s = sin(instanceRot.y + ubo.locSpeed);
+	c = cos(instanceRot.y + ubo.locSpeed);
+
+	my[0] = vec3(c, 0.0, s);
+	my[1] = vec3(0.0, 1.0, 0.0);
+	my[2] = vec3(-s, 0.0, c);
+	
+	// rot around z
+	s = sin(instanceRot.z + ubo.locSpeed);
+	c = cos(instanceRot.z + ubo.locSpeed);	
+	
+	mz[0] = vec3(1.0, 0.0, 0.0);
+	mz[1] = vec3(0.0, c, s);
+	mz[2] = vec3(0.0, -s, c);
+	
+	mat3 rotMat = mz * my * mx;
+
+	mat4 gRotMat;
+	s = sin(instanceRot.y + ubo.globSpeed);
+	c = cos(instanceRot.y + ubo.globSpeed);
+	gRotMat[0] = vec4(c, 0.0, s, 0.0);
+	gRotMat[1] = vec4(0.0, 1.0, 0.0, 0.0);
+	gRotMat[2] = vec4(-s, 0.0, c, 0.0);
+	gRotMat[3] = vec4(0.0, 0.0, 0.0, 1.0);	
+	
+	vec4 locPos = vec4(inPos.xyz * rotMat, 1.0);
+	vec4 pos = vec4((locPos.xyz * instanceScale) + instancePos, 1.0);
+
+	gl_Position = ubo.projection * ubo.modelview * gRotMat * pos;
+	outNormal = mat3(ubo.modelview * gRotMat) * inverse(rotMat) * inNormal;
+
+	pos = ubo.modelview * vec4(inPos.xyz + instancePos, 1.0);
+	vec3 lPos = mat3(ubo.modelview) * ubo.lightPos.xyz;
+	outLightVec = lPos - pos.xyz;
+	outViewVec = -pos.xyz;		
+}