Add interger pack/unpack intrinsic to glsl (#6997)

* Add interger pack/unpack intrinsic to glsl

Add unpack8, unpack16 and pack32 intrinsics to glsl.

* add unit test

* fix lowering logic for 'bitcast'

* format

1 files changed, 77 insertions, 0 deletions

diff --git a/tests/glsl/interger_pack.slang b/tests/glsl/interger_pack.slang
new file mode 100644
index 000000000..7bf414c4d
--- /dev/null
+++ b/tests/glsl/interger_pack.slang
@@ -0,0 +1,77 @@
+//TEST(compute, vulkan):COMPARE_COMPUTE(filecheck-buffer=BUF):-vk -compute -entry computeMain -allow-glsl
+//TEST(compute, vulkan):COMPARE_COMPUTE(filecheck-buffer=BUF):-vk -compute -entry computeMain -allow-glsl -emit-spirv-via-glsl
+
+#version 450
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+layout(scalar) buffer MyBlockName2
+{
+    uvec4 a;
+    ivec4 b;
+
+    uvec2 c;
+    ivec2 d;
+
+    uvec2 e;
+    ivec2 f;
+
+    uint32_t g;
+    int32_t h;
+
+    uint32_t i;
+    int32_t j;
+} outputBuffer;
+
+layout(local_size_x = 1) in;
+void computeMain()
+{
+    uint32_t a = 0xF2845678;
+    outputBuffer.a = unpack8(a);
+    // BUF: 78
+    // BUF-NEXT: 56
+    // BUF-NEXT: 84
+    // BUF-NEXT: F2
+
+    int32_t b = 0xF2845678;
+    outputBuffer.b = unpack8(b);
+    // BUF: 78
+    // BUF-NEXT: 56
+    // BUF-NEXT: FFFFFF84
+    // BUF-NEXT: FFFFFFF2
+
+    uint16_t c = 0xF256;
+    outputBuffer.c = unpack8(c);
+    // BUF-NEXT: 56
+    // BUF-NEXT: F2
+
+    int16_t d = 0xF256;
+    outputBuffer.d = unpack8(d);
+    // BUF-NEXT: 56
+    // BUF-NEXT: FFFFFFF2
+
+    uint32_t e = 0xF2845678;
+    outputBuffer.e = unpack16(e);
+    // BUF-NEXT: 5678
+    // BUF-NEXT: F284
+
+    int32_t f = 0xF2845678;
+    outputBuffer.f = unpack16(f);
+    // BUF-NEXT: 5678
+    // BUF-NEXT: FFFFF284
+
+    u16vec2 g = {0xF256, 0x1234};
+    outputBuffer.g = pack32(g);
+    // BUF-NEXT: 1234F256
+
+    i16vec2 h = {0xF256, 0x1234};
+    outputBuffer.h = pack32(h);
+    // BUF-NEXT: 1234F256
+
+    u8vec4 i = {0xF2, 0x56, 0x12, 0x34};
+    outputBuffer.i = pack32(i);
+    // BUF-NEXT: 341256F2
+
+    i8vec4 j = {0x82, 0x56, 0x12, 0x80};
+    outputBuffer.j = pack32(j);
+    // BUF-NEXT: 80125682
+}