rhi: Add support for arrays of combined image samplers

Introduces a new QRhiShaderResourceBinding function that takes an array
of texture-sampler pairs. The existing function is also available and is
equivalent to calling the array-based version with array size 1.

It is important to note that for Metal one needs MSL 2.0 for array of
textures, so qsb needs --msl 20 instead of --msl 12 for such shaders.

Comes with an autotest, and also updates all .qsb files for said test
with the latest shadertools.

Task-number: QTBUG-82624
Change-Id: Ibc1973aae826836f16d842c41d6c8403fd7ff876
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

1 files changed, 9 insertions, 2 deletions

diff --git a/src/gui/rhi/qrhi_p.h b/src/gui/rhi/qrhi_p.h
index 17c911a5ff..9d906d7bbd 100644
--- a/src/gui/rhi/qrhi_p.h
+++ b/src/gui/rhi/qrhi_p.h
@@ -348,6 +348,12 @@ public:
 
     static QRhiShaderResourceBinding sampledTexture(int binding, StageFlags stage, QRhiTexture *tex, QRhiSampler *sampler);
 
+    struct TextureAndSampler {
+        QRhiTexture *tex;
+        QRhiSampler *sampler;
+    };
+    static QRhiShaderResourceBinding sampledTextures(int binding, StageFlags stage, int count, const TextureAndSampler *texSamplers);
+
     static QRhiShaderResourceBinding imageLoad(int binding, StageFlags stage, QRhiTexture *tex, int level);
     static QRhiShaderResourceBinding imageStore(int binding, StageFlags stage, QRhiTexture *tex, int level);
     static QRhiShaderResourceBinding imageLoadStore(int binding, StageFlags stage, QRhiTexture *tex, int level);
@@ -370,9 +376,10 @@ public:
             int maybeSize;
             bool hasDynamicOffset;
         };
+        static const int MAX_TEX_SAMPLER_ARRAY_SIZE = 16;
         struct SampledTextureData {
-            QRhiTexture *tex;
-            QRhiSampler *sampler;
+            int count;
+            TextureAndSampler texSamplers[MAX_TEX_SAMPLER_ARRAY_SIZE];
         };
         struct StorageImageData {
             QRhiTexture *tex;