glplanet, an OpenGL-based planetary rendererHEADmain

glplanet draws Earth like it currently appears from space, putting
nighttime areas in shadow and daytime areas in light. It’s modeled
after Xplanet (http://xplanet.sourceforge.net/), but whereas Xplanet is
entirely a CPU-resident program, glplanet draws using OpenGL. It’s thus
much less resource-intensive, particularly when using high-resolution
textures.

1 files changed, 30 insertions, 0 deletions

diff --git a/src/vertex.glsl b/src/vertex.glsl
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index 0000000..edad07e
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+++ b/src/vertex.glsl
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+// Copyright 2021 Benjamin Barenblat
+//
+// 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
+//
+//     https://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.
+
+#version 150
+
+in vec3 cartesian_position;
+in vec2 vertex_geographic_position;
+in vec2 vertex_texture_coordinate;
+
+uniform mat4 mvp;
+
+out vec3 model_cartesian_position;
+out vec2 texture_coordinate;
+
+void main() {
+  gl_Position = mvp * vec4(cartesian_position, 1.0);
+  model_cartesian_position = cartesian_position;
+  texture_coordinate = vertex_texture_coordinate;
+}