Add test case for combined depth image sampler in GLSL.

reference/shaders/vulkan/frag/combined-texture-sampler-shadow.vk.frag

@@ -0,0 +1,31 @@
+#version 310 es
+precision mediump float;
+precision highp int;
+
+uniform mediump sampler2DShadow SPIRV_Cross_CombineduDepthuSampler;
+uniform mediump sampler2D SPIRV_Cross_CombineduDepthuSampler1;
+
+layout(location = 0) out float FragColor;
+
+float samp2(mediump sampler2DShadow SPIRV_Cross_Combinedts)
+{
+    return texture(SPIRV_Cross_Combinedts, vec3(vec3(1.0).xy, vec3(1.0).z));
+}
+
+float samp3(mediump sampler2D SPIRV_Cross_Combinedts)
+{
+    return texture(SPIRV_Cross_Combinedts, vec2(1.0)).x;
+}
+
+float samp(mediump sampler2DShadow SPIRV_Cross_Combinedts, mediump sampler2D SPIRV_Cross_Combinedts1)
+{
+    float r0 = samp2(SPIRV_Cross_Combinedts);
+    float r1 = samp3(SPIRV_Cross_Combinedts1);
+    return r0 + r1;
+}
+
+void main()
+{
+    FragColor = samp(SPIRV_Cross_CombineduDepthuSampler, SPIRV_Cross_CombineduDepthuSampler1);
+}
+

reference/shaders/vulkan/frag/combined-texture-sampler-shadow.vk.frag.vk

@@ -0,0 +1,32 @@
+#version 310 es
+precision mediump float;
+precision highp int;
+
+layout(set = 0, binding = 2) uniform mediump texture2D uDepth;
+layout(set = 0, binding = 0) uniform mediump samplerShadow uSampler;
+layout(set = 0, binding = 1) uniform mediump sampler uSampler1;
+
+layout(location = 0) out float FragColor;
+
+float samp2(mediump texture2D t, mediump samplerShadow s)
+{
+    return texture(sampler2DShadow(t, s), vec3(vec3(1.0).xy, vec3(1.0).z));
+}
+
+float samp3(mediump texture2D t, mediump sampler s)
+{
+    return texture(sampler2D(t, s), vec2(1.0)).x;
+}
+
+float samp(mediump texture2D t, mediump samplerShadow s, mediump sampler s1)
+{
+    float r0 = samp2(t, s);
+    float r1 = samp3(t, s1);
+    return r0 + r1;
+}
+
+void main()
+{
+    FragColor = samp(uDepth, uSampler, uSampler1);
+}
+

shaders/vulkan/frag/combined-texture-sampler-shadow.vk.frag

@@ -0,0 +1,29 @@
+#version 310 es
+precision mediump float;
+
+layout(set = 0, binding = 0) uniform mediump samplerShadow uSampler;
+layout(set = 0, binding = 1) uniform mediump sampler uSampler1;
+layout(set = 0, binding = 2) uniform texture2D uDepth;
+layout(location = 0) out float FragColor;
+
+float samp2(texture2D t, mediump samplerShadow s)
+{
+   return texture(sampler2DShadow(t, s), vec3(1.0));
+}
+
+float samp3(texture2D t, mediump sampler s)
+{
+   return texture(sampler2D(t, s), vec2(1.0)).x;
+}
+
+float samp(texture2D t, mediump samplerShadow s, mediump sampler s1)
+{
+   float r0 = samp2(t, s);
+   float r1 = samp3(t, s1);
+   return r0 + r1;
+}
+
+void main()
+{
+   FragColor = samp(uDepth, uSampler, uSampler1);
+}