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authorBastiaanOlij <mux213@gmail.com>2017-09-28 22:15:21 +1000
committerBastiaanOlij <mux213@gmail.com>2017-09-28 22:44:41 +1000
commitca4f055db0a4e6f9ea7b38cde14dc85ada3330e2 (patch)
tree405d52f7a909c2c273f2528f0f838d76ed131de2 /modules/mobile_vr/shaders
parent4f39ce32b9195405f934445b20059e86632b47f9 (diff)
reintroduce generic mobile vr interface
Diffstat (limited to 'modules/mobile_vr/shaders')
-rw-r--r--modules/mobile_vr/shaders/SCsub7
-rw-r--r--modules/mobile_vr/shaders/lens_distorted.glsl59
2 files changed, 66 insertions, 0 deletions
diff --git a/modules/mobile_vr/shaders/SCsub b/modules/mobile_vr/shaders/SCsub
new file mode 100644
index 0000000000..cf53c9ebe0
--- /dev/null
+++ b/modules/mobile_vr/shaders/SCsub
@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+
+Import('env')
+
+if 'GLES3_GLSL' in env['BUILDERS']:
+ env.GLES3_GLSL('lens_distorted.glsl');
+
diff --git a/modules/mobile_vr/shaders/lens_distorted.glsl b/modules/mobile_vr/shaders/lens_distorted.glsl
new file mode 100644
index 0000000000..5a2975d737
--- /dev/null
+++ b/modules/mobile_vr/shaders/lens_distorted.glsl
@@ -0,0 +1,59 @@
+[vertex]
+
+layout(location=0) in highp vec4 vertex_attrib;
+layout(location=4) in vec2 uv_in;
+
+uniform float offset_x;
+
+out vec2 uv_interp;
+
+void main() {
+
+ uv_interp = uv_in;
+ gl_Position = vec4(vertex_attrib.x + offset_x, vertex_attrib.y, 0.0, 1.0);
+}
+
+[fragment]
+
+uniform sampler2D source; //texunit:0
+
+uniform vec2 eye_center;
+uniform float k1;
+uniform float k2;
+uniform float upscale;
+uniform float aspect_ratio;
+
+in vec2 uv_interp;
+
+layout(location = 0) out vec4 frag_color;
+
+void main() {
+ vec2 coords = uv_interp;
+ vec2 offset = coords - eye_center;
+
+ // take aspect ratio into account
+ offset.y /= aspect_ratio;
+
+ // distort
+ vec2 offset_sq = offset * offset;
+ float radius_sq = offset_sq.x + offset_sq.y;
+ float radius_s4 = radius_sq * radius_sq;
+ float distortion_scale = 1.0 + (k1 * radius_sq) + (k2 * radius_s4);
+ offset *= distortion_scale;
+
+ // reapply aspect ratio
+ offset.y *= aspect_ratio;
+
+ // add our eye center back in
+ coords = offset + eye_center;
+ coords /= upscale;
+
+ // and check our color
+ if (coords.x < -1.0 || coords.y < -1.0 || coords.x > 1.0 || coords.y > 1.0) {
+ frag_color = vec4(0.0, 0.0, 0.0, 1.0);
+ } else {
+ coords = (coords + vec2(1.0)) / vec2(2.0);
+ frag_color = textureLod(source, coords, 0.0);
+ }
+}
+