1 files changed, 34 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/gpu_shader_keyframe_diamond_vert.glsl b/source/blender/gpu/shaders/gpu_shader_keyframe_diamond_vert.glsl
new file mode 100644
index 00000000000..c49832bf9b4
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_keyframe_diamond_vert.glsl
@@ -0,0 +1,34 @@
+
+uniform mat4 ModelViewProjectionMatrix;
+
+const float pixel_fudge = sqrt(2.0);
+const float outline_width = 1.15 * pixel_fudge;
+
+in vec2 pos;
+in float size;
+in vec4 color;
+in vec4 outlineColor;
+out vec4 finalColor;
+out vec4 finalOutlineColor;
+out vec4 radii;
+
+void main() {
+	gl_Position = ModelViewProjectionMatrix * vec4(pos, 0.0, 1.0);
+
+	// pass through unchanged
+	gl_PointSize = size + pixel_fudge; // 0.5 pixel_fudge on either side
+	finalColor = color;
+	finalOutlineColor = outlineColor;
+
+	// calculate concentric radii in pixels
+	float radius = 0.5 * gl_PointSize;
+
+	// start at the outside and progress toward the center
+	radii[0] = radius;
+	radii[1] = radius - pixel_fudge;
+	radii[2] = radius - outline_width;
+	radii[3] = radius - outline_width - pixel_fudge;
+
+	// convert to PointCoord units
+	radii /= size;
+}