Add special test for more coverage in combined image sampler.

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

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+#version 310 es
+precision mediump float;
+precision highp int;
+
+uniform mediump sampler2D SPIRV_Cross_CombineduTexture0uSampler0;
+uniform mediump sampler2D SPIRV_Cross_CombineduTexture1uSampler1;
+uniform mediump sampler2D SPIRV_Cross_CombineduTexture1uSampler0;
+uniform mediump sampler2D SPIRV_Cross_CombineduTexture0uSampler1;
+
+layout(location = 0) in vec2 vTex;
+layout(location = 0) out vec4 FragColor;
+
+vec4 sample_dual(mediump sampler2D SPIRV_Cross_Combinedtexsamp)
+{
+    return texture(SPIRV_Cross_Combinedtexsamp, vTex);
+}
+
+vec4 sample_duals()
+{
+    vec4 a = sample_dual(SPIRV_Cross_CombineduTexture0uSampler0);
+    vec4 b = sample_dual(SPIRV_Cross_CombineduTexture1uSampler1);
+    return (a + b);
+}
+
+vec4 sample_global_tex(mediump sampler2D SPIRV_Cross_CombineduTexture0samp, mediump sampler2D SPIRV_Cross_CombineduTexture1samp)
+{
+    vec4 a = texture(SPIRV_Cross_CombineduTexture0samp, vTex);
+    vec4 b = sample_dual(SPIRV_Cross_CombineduTexture1samp);
+    return (a + b);
+}
+
+vec4 sample_global_sampler(mediump sampler2D SPIRV_Cross_CombinedtexuSampler0, mediump sampler2D SPIRV_Cross_CombinedtexuSampler1)
+{
+    vec4 a = texture(SPIRV_Cross_CombinedtexuSampler0, vTex);
+    vec4 b = sample_dual(SPIRV_Cross_CombinedtexuSampler1);
+    return (a + b);
+}
+
+void main()
+{
+    vec4 c0 = sample_duals();
+    vec4 c1 = sample_global_tex(SPIRV_Cross_CombineduTexture0uSampler0, SPIRV_Cross_CombineduTexture1uSampler0);
+    vec4 c2 = sample_global_tex(SPIRV_Cross_CombineduTexture0uSampler1, SPIRV_Cross_CombineduTexture1uSampler1);
+    vec4 c3 = sample_global_sampler(SPIRV_Cross_CombineduTexture0uSampler0, SPIRV_Cross_CombineduTexture0uSampler1);
+    vec4 c4 = sample_global_sampler(SPIRV_Cross_CombineduTexture1uSampler0, SPIRV_Cross_CombineduTexture1uSampler1);
+    FragColor = ((((c0 + c1) + c2) + c3) + c4);
+}
+

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

@@ -0,0 +1,48 @@
+#version 310 es
+precision mediump float;
+precision highp int;
+
+layout(set = 0, binding = 2) uniform mediump texture2D uTexture0;
+layout(set = 0, binding = 3) uniform mediump texture2D uTexture1;
+layout(set = 0, binding = 0) uniform mediump sampler uSampler0;
+layout(set = 0, binding = 1) uniform mediump sampler uSampler1;
+
+layout(location = 0) in vec2 vTex;
+layout(location = 0) out vec4 FragColor;
+
+vec4 sample_dual(mediump sampler samp, mediump texture2D tex)
+{
+    return texture(sampler2D(tex, samp), vTex);
+}
+
+vec4 sample_duals()
+{
+    vec4 a = sample_dual(uSampler0, uTexture0);
+    vec4 b = sample_dual(uSampler1, uTexture1);
+    return (a + b);
+}
+
+vec4 sample_global_tex(mediump sampler samp)
+{
+    vec4 a = texture(sampler2D(uTexture0, samp), vTex);
+    vec4 b = sample_dual(samp, uTexture1);
+    return (a + b);
+}
+
+vec4 sample_global_sampler(mediump texture2D tex)
+{
+    vec4 a = texture(sampler2D(tex, uSampler0), vTex);
+    vec4 b = sample_dual(uSampler1, tex);
+    return (a + b);
+}
+
+void main()
+{
+    vec4 c0 = sample_duals();
+    vec4 c1 = sample_global_tex(uSampler0);
+    vec4 c2 = sample_global_tex(uSampler1);
+    vec4 c3 = sample_global_sampler(uTexture0);
+    vec4 c4 = sample_global_sampler(uTexture1);
+    FragColor = ((((c0 + c1) + c2) + c3) + c4);
+}
+

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

@@ -0,0 +1,47 @@
+#version 310 es
+precision mediump float;
+
+layout(set = 0, binding = 0) uniform mediump sampler uSampler0;
+layout(set = 0, binding = 1) uniform mediump sampler uSampler1;
+layout(set = 0, binding = 2) uniform mediump texture2D uTexture0;
+layout(set = 0, binding = 3) uniform mediump texture2D uTexture1;
+
+layout(location = 0) out vec4 FragColor;
+layout(location = 0) in vec2 vTex;
+
+vec4 sample_dual(mediump sampler samp, mediump texture2D tex)
+{
+   return texture(sampler2D(tex, samp), vTex);
+}
+
+vec4 sample_global_tex(mediump sampler samp)
+{
+   vec4 a = texture(sampler2D(uTexture0, samp), vTex);
+   vec4 b = sample_dual(samp, uTexture1);
+   return a + b;
+}
+
+vec4 sample_global_sampler(mediump texture2D tex)
+{
+   vec4 a = texture(sampler2D(tex, uSampler0), vTex);
+   vec4 b = sample_dual(uSampler1, tex);
+   return a + b;
+}
+
+vec4 sample_duals()
+{
+   vec4 a = sample_dual(uSampler0, uTexture0);
+   vec4 b = sample_dual(uSampler1, uTexture1);
+   return a + b;
+}
+
+void main()
+{
+    vec4 c0 = sample_duals();
+    vec4 c1 = sample_global_tex(uSampler0);
+    vec4 c2 = sample_global_tex(uSampler1);
+    vec4 c3 = sample_global_sampler(uTexture0);
+    vec4 c4 = sample_global_sampler(uTexture1);
+
+    FragColor = c0 + c1 + c2 + c3 + c4;
+}