init

shaders/dynamic_line_rasterization/glsl/base.frag

@@ -0,0 +1,27 @@
+#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 (location = 0) out vec4 outFragColor;
+layout( push_constant ) uniform Push_Constants{
+    vec4 color;
+} pushConstant;
+
+
+void main() {
+    outFragColor = pushConstant.color;
+}

shaders/dynamic_line_rasterization/glsl/base.vert

@@ -0,0 +1,35 @@
+#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 (location = 0) in vec3 inPos;
+
+layout (binding = 0) uniform Ubo
+{
+    mat4 projection;
+    mat4 view;
+    mat4 model;
+} ubo;
+
+
+out gl_PerVertex {
+    vec4 gl_Position;
+};
+
+void main() {
+    gl_Position = ubo.projection * ubo.view * ubo.model * vec4(inPos.xyz - vec3(0.0f, 1.0f, 0.0f), 1.0f);
+}

shaders/dynamic_line_rasterization/glsl/grid.frag

@@ -0,0 +1,58 @@
+#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(location = 0) in vec3 nearPoint;
+layout(location = 1) in vec3 farPoint;
+layout(location = 2) in mat4 view;
+layout(location = 6) in mat4 projection;
+layout(location = 0) out vec4 outColor;
+
+vec4 grid(vec3 pos) {
+    vec2 coord = pos.xz;
+    vec2 derivative = fwidth(coord);
+    vec2 grid = abs(fract(coord - 0.5) - 0.5) / derivative;
+    float line = min(grid.x, grid.y);
+    float minimumz = min(derivative.y, 1);
+    float minimumx = min(derivative.x, 1);
+    vec4 color = vec4(0.5, 0.5, 0.5, 1.0 - min(line, 1.0));
+
+    if(abs(pos.x) < minimumx)
+        color.y = 1;
+    if(abs(pos.z) < minimumz)
+        color.x = 1;
+    return color;
+}
+
+float fadeFactor(vec3 pos) {
+    float z = (projection * view * vec4(pos.xyz, 1.0)).z;
+    // Empirical values are used to determine when to cut off the grid before moire patterns become visible.
+    return z * 6 - 0.5;
+}
+
+void main() {
+    float t = -nearPoint.y / (farPoint.y - nearPoint.y);
+    vec3 pos = nearPoint + t * (farPoint - nearPoint);
+
+    // Display only the lower plane
+    if(t < 1) {
+        vec4 gridColor = grid(pos);
+        outColor = vec4(gridColor.xyz, gridColor.w * fadeFactor(pos));
+    }
+    else
+        outColor = vec4(0.0, 0.0, 0.0, 0.0);
+}

shaders/dynamic_line_rasterization/glsl/grid.vert

@@ -0,0 +1,55 @@
+#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);
+
+
+}