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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2020-09-13 01:04:20 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2020-10-04 22:51:45 +0300
commitae9e7fbf3a8bf45b08951b650aec3f91997fafc3 (patch)
tree0509a8e0dd18f5456a341f936d53d93bb55df621 /src/qcam/assets/shader/YUV_2_planes.frag
parent0bc03960daf0d7e28d45513873e3d1feecbedbf6 (diff)
qcam: viewfinder_gl: Merge the semi-planar UV and VU shaders
Use macros to select the U and V pattern, to avoid code duplication between the two semi-planar shaders. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Diffstat (limited to 'src/qcam/assets/shader/YUV_2_planes.frag')
-rw-r--r--src/qcam/assets/shader/YUV_2_planes.frag39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/qcam/assets/shader/YUV_2_planes.frag b/src/qcam/assets/shader/YUV_2_planes.frag
new file mode 100644
index 00000000..125f1c85
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+++ b/src/qcam/assets/shader/YUV_2_planes.frag
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Linaro
+ *
+ * YUV_2_planes.frag - Fragment shader code for NV12, NV16 and NV24 formats
+ */
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+varying vec2 textureOut;
+uniform sampler2D tex_y;
+uniform sampler2D tex_u;
+
+void main(void)
+{
+ vec3 yuv;
+ vec3 rgb;
+ mat3 yuv2rgb_bt601_mat = mat3(
+ vec3(1.164, 1.164, 1.164),
+ vec3(0.000, -0.392, 2.017),
+ vec3(1.596, -0.813, 0.000)
+ );
+
+ yuv.x = texture2D(tex_y, textureOut).r - 0.063;
+#if defined(YUV_PATTERN_UV)
+ yuv.y = texture2D(tex_u, textureOut).r - 0.500;
+ yuv.z = texture2D(tex_u, textureOut).g - 0.500;
+#elif defined(YUV_PATTERN_VU)
+ yuv.y = texture2D(tex_u, textureOut).g - 0.500;
+ yuv.z = texture2D(tex_u, textureOut).r - 0.500;
+#else
+#error Invalid pattern
+#endif
+
+ rgb = yuv2rgb_bt601_mat * yuv;
+ gl_FragColor = vec4(rgb, 1.0);
+}