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authorAndrey Konovalov <andrey.konovalov@linaro.org>2021-06-22 16:46:46 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-06-30 04:07:58 +0300
commit6424e8640781939bcb9a1a56c6447a8046b9cfe0 (patch)
tree93b29ef6448c2de0b66f0c6296bbe2995138294d /src/qcam/assets/shader/bayer_1x_packed.frag
parentc4259493dc8db1a78bdbf47b912d24b899c0f45c (diff)
qcam: viewfinder_gl: Add support for RAW12 packed formats
All the four Bayer orders are supported. The 4 LS bits of the 12-bit colour values are dropped as the RGBA format we convert into has only 8 bits per colour. Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src/qcam/assets/shader/bayer_1x_packed.frag')
-rw-r--r--src/qcam/assets/shader/bayer_1x_packed.frag43
1 files changed, 37 insertions, 6 deletions
diff --git a/src/qcam/assets/shader/bayer_1x_packed.frag b/src/qcam/assets/shader/bayer_1x_packed.frag
index d36db8a2..f53f5575 100644
--- a/src/qcam/assets/shader/bayer_1x_packed.frag
+++ b/src/qcam/assets/shader/bayer_1x_packed.frag
@@ -23,6 +23,40 @@
precision mediump float;
#endif
+/*
+ * These constants are used to select the bytes containing the HS part of
+ * the pixel value:
+ * BPP - bytes per pixel,
+ * THRESHOLD_L = fract(BPP) * 0.5 + 0.02
+ * THRESHOLD_H = 1.0 - fract(BPP) * 1.5 + 0.02
+ * Let X is the x coordinate in the texture measured in bytes (so that the
+ * range is from 0 to (stride_-1)) aligned on the nearest pixel.
+ * E.g. for RAW10P:
+ * -------------+-------------------+-------------------+--
+ * pixel No | 0 1 2 3 | 4 5 6 7 | ...
+ * -------------+-------------------+-------------------+--
+ * byte offset | 0 1 2 3 4 | 5 6 7 8 9 | ...
+ * -------------+-------------------+-------------------+--
+ * X | 0.0 1.25 2.5 3.75 | 5.0 6.25 7.5 8.75 | ...
+ * -------------+-------------------+-------------------+--
+ * If fract(X) < THRESHOLD_L then the previous byte contains the LS
+ * bits of the pixel values and needs to be skipped.
+ * If fract(X) > THRESHOLD_H then the next byte contains the LS bits
+ * of the pixel values and needs to be skipped.
+ */
+#if defined(RAW10P)
+#define BPP 1.25
+#define THRESHOLD_L 0.14
+#define THRESHOLD_H 0.64
+#elif defined(RAW12P)
+#define BPP 1.5
+#define THRESHOLD_L 0.27
+#define THRESHOLD_H 0.27
+#else
+#error Invalid raw format
+#endif
+
+
varying vec2 textureOut;
/* the texture size in pixels */
@@ -66,10 +100,7 @@ void main(void)
* Add a small number (a few mantissa's LSBs) to avoid float
* representation issues. Maybe paranoic.
*/
- center_bytes.x = BPP_X * center_pixel.x + 0.02;
-
- const float threshold_l = 0.127 /* fract(BPP_X) * 0.5 + 0.02 */;
- const float threshold_h = 0.625 /* 1.0 - fract(BPP_X) * 1.5 */;
+ center_bytes.x = BPP * center_pixel.x + 0.02;
float fract_x = fract(center_bytes.x);
@@ -90,14 +121,14 @@ void main(void)
* of the previous group of the pixels, move xcoords[0] one
* byte back.
*/
- xcoords[0] += (fract_x < threshold_l) ? -tex_step.x : 0.0;
+ xcoords[0] += (fract_x < THRESHOLD_L) ? -tex_step.x : 0.0;
/*
* If xcoords[1] points at the byte containing the LS bits
* of the current group of the pixels, move xcoords[1] one
* byte forward.
*/
- xcoords[1] += (fract_x > threshold_h) ? tex_step.x : 0.0;
+ xcoords[1] += (fract_x > THRESHOLD_H) ? tex_step.x : 0.0;
vec2 alternate = mod(center_pixel.xy + tex_bayer_first_red, 2.0);
bool even_col = alternate.x < 1.0;