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shaders/dynamic_line_rasterization/glsl/grid.vert

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+#version 450
+/* Copyright (c) 2023-2024, Mobica Limited
+ *
+ * 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.
+ */
+
+layout(binding = 0) uniform Ubo {
+    mat4 projection;
+    mat4 view;
+    mat4 model;
+    mat4 viewProjectionInverse;
+} ubo;
+
+layout(location = 0) out vec3 nearPoint;
+layout(location = 1) out vec3 farPoint;
+layout(location = 2) out mat4 view;
+layout(location = 6) out mat4 projection;
+
+
+vec3 unprojectPoint(float x, float y, float z, mat4 viewProjectionInverse) {
+    vec4 clipSpacePos = vec4(x, y, z, 1.0);
+    vec4 eyeSpacePos = viewProjectionInverse * clipSpacePos;
+    return eyeSpacePos.xyz / eyeSpacePos.w;
+}
+
+vec3 gridPlane[6] = vec3[](
+    vec3(1, 1, 0), vec3(-1, -1, 0), vec3(-1, 1, 0),
+    vec3(-1, -1, 0), vec3(1, 1, 0), vec3(1, -1, 0)
+);
+
+void main() {
+    vec3 pos = gridPlane[gl_VertexIndex].xyz;
+
+    nearPoint = unprojectPoint(pos.x, pos.y, 0.0, ubo.viewProjectionInverse);
+    farPoint = unprojectPoint(pos.x, pos.y, 1.0, ubo.viewProjectionInverse);
+
+    view = ubo.view;
+    projection = ubo.projection;
+
+    gl_Position = vec4(pos, 1.0);
+
+
+}