rhi: Handle RHI-required information in QShaderGraph

Change-Id: I705843bbb1f6928c2e36b327469882e11fb9613e
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/extras/shaders/rhi/skybox.frag b/src/extras/shaders/rhi/skybox.frag
new file mode 100644
index 000000000..ceb13b628
--- /dev/null
+++ b/src/extras/shaders/rhi/skybox.frag
@@ -0,0 +1,24 @@
+#version 330
+
+in vec3 texCoord0;
+out vec4 fragColor;
+uniform samplerCube skyboxTexture;
+
+// Gamma correction
+uniform float gamma = 2.2;
+
+uniform float gammaStrength;
+
+vec3 gammaCorrect(const in vec3 color)
+{
+    return pow(color, vec3(1.0 / gamma));
+}
+
+void main()
+{
+    vec4 baseColor = texture(skyboxTexture, texCoord0);
+    vec4 gammaColor = vec4(gammaCorrect(baseColor.rgb), 1.0);
+    // This is an odd way to enable or not gamma correction,
+    // but this is a way to avoid branching until we can generate shaders
+    fragColor = mix(baseColor, gammaColor, gammaStrength);
+}