[RenderEngine] Use highp in shader.

Previously, OETF for PQ transfer function didn't have highp which caused
precesion problem, resulting in noise when hardware composer is in BT2100_PQ
color mode. This patch makes sure we use highp when applying PQ transfer
function.

BUG: 73825729
Test: Build, flash, boot and watch Youtube HDR.
Change-Id: I898e58c641cb9cb678a25d2992695f675b157f9b

1 files changed, 6 insertions, 6 deletions

diff --git a/services/surfaceflinger/RenderEngine/ProgramCache.cpp b/services/surfaceflinger/RenderEngine/ProgramCache.cpp
index 7c2cb5b13c..2808a1a912 100644
--- a/services/surfaceflinger/RenderEngine/ProgramCache.cpp
+++ b/services/surfaceflinger/RenderEngine/ProgramCache.cpp
@@ -422,13 +422,13 @@ void ProgramCache::generateOETF(Formatter& fs, const Key& needs) {
         case Key::OUTPUT_TF_ST2084:
             fs << R"__SHADER__(
                 vec3 OETF(const vec3 linear) {
-                    const float m1 = (2610.0 / 4096.0) / 4.0;
-                    const float m2 = (2523.0 / 4096.0) * 128.0;
-                    const float c1 = (3424.0 / 4096.0);
-                    const float c2 = (2413.0 / 4096.0) * 32.0;
-                    const float c3 = (2392.0 / 4096.0) * 32.0;
+                    const highp float m1 = (2610.0 / 4096.0) / 4.0;
+                    const highp float m2 = (2523.0 / 4096.0) * 128.0;
+                    const highp float c1 = (3424.0 / 4096.0);
+                    const highp float c2 = (2413.0 / 4096.0) * 32.0;
+                    const highp float c3 = (2392.0 / 4096.0) * 32.0;
 
-                    vec3 tmp = pow(linear, vec3(m1));
+                    highp vec3 tmp = pow(linear, vec3(m1));
                     tmp = (c1 + c2 * tmp) / (1.0 + c3 * tmp);
                     return pow(tmp, vec3(m2));
                 }