rename built-in point shaders, SMOOTH --> AA

Updated shader names and code that uses them.

All of these shaders produce round points that are anti-aliased and blended against the background.

These were initially named SMOOTH because they replace glEnable(GL_POINT_SMOOTH). But SMOOTH in shader-land refers to vertex attribute interpolation (like glShadeModel(GL_SMOOTH)).

Using SMOOTH to mean two things is confusing, so we now use AA to mean "the point is anti-aliased".

1 files changed, 29 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/gpu_shader_3D_point_uniform_size_outline_aa_vert.glsl b/source/blender/gpu/shaders/gpu_shader_3D_point_uniform_size_outline_aa_vert.glsl
new file mode 100644
index 00000000000..d05920002ed
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_3D_point_uniform_size_outline_aa_vert.glsl
@@ -0,0 +1,29 @@
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform float size;
+uniform float outlineWidth;
+
+#if __VERSION__ == 120
+  attribute vec3 pos;
+  varying vec4 radii;
+#else
+  in vec3 pos;
+  out vec4 radii;
+#endif
+
+void main() {
+	gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
+	gl_PointSize = size;
+
+	// calculate concentric radii in pixels
+	float radius = 0.5 * size;
+
+	// start at the outside and progress toward the center
+	radii[0] = radius;
+	radii[1] = radius - 1.0;
+	radii[2] = radius - outlineWidth;
+	radii[3] = radius - outlineWidth - 1.0;
+
+	// convert to PointCoord units
+	radii /= size;
+}