Add standalone testbed

imgui/StandaloneImGuiTestbed/Shaders/GLSL/imgui-frag.glsl

@@ -0,0 +1,13 @@
+#version 330 core
+
+uniform sampler2D FontTexture;
+
+in vec4 color;
+in vec2 texCoord;
+
+out vec4 outputColor;
+
+void main()
+{
+    outputColor = color * texture(FontTexture, texCoord);
+}

imgui/StandaloneImGuiTestbed/Shaders/GLSL/imgui-vertex.glsl

@@ -0,0 +1,20 @@
+#version 330 core
+
+uniform ProjectionMatrixBuffer
+{
+    mat4 projection_matrix;
+};
+
+in vec2 in_position;
+in vec2 in_texCoord;
+in vec4 in_color;
+
+out vec4 color;
+out vec2 texCoord;
+
+void main()
+{
+    gl_Position = projection_matrix * vec4(in_position, 0, 1);
+    color = in_color;
+	texCoord = in_texCoord;
+}

imgui/StandaloneImGuiTestbed/Shaders/HLSL/imgui-frag.hlsl

@@ -0,0 +1,15 @@
+struct PS_INPUT
+{
+    float4 pos : SV_POSITION;
+    float4 col : COLOR0;
+    float2 uv  : TEXCOORD0;
+};
+
+Texture2D FontTexture : register(t0);
+sampler FontSampler : register(s0);
+
+float4 FS(PS_INPUT input) : SV_Target
+{
+    float4 out_col = input.col * FontTexture.Sample(FontSampler, input.uv);
+    return out_col;
+}

imgui/StandaloneImGuiTestbed/Shaders/HLSL/imgui-vertex.hlsl

@@ -0,0 +1,27 @@
+cbuffer ProjectionMatrixBuffer : register(b0)
+{
+    float4x4 ProjectionMatrix;
+};
+
+struct VS_INPUT
+{
+    float2 pos : POSITION;
+    float2 uv  : TEXCOORD0;
+    float4 col : COLOR0;
+};
+
+struct PS_INPUT
+{
+    float4 pos : SV_POSITION;
+    float4 col : COLOR0;
+    float2 uv  : TEXCOORD0;
+};
+
+PS_INPUT VS(VS_INPUT input)
+{
+    PS_INPUT output;
+    output.pos = mul(ProjectionMatrix, float4(input.pos.xy, 0.f, 1.f));
+    output.col = input.col;
+    output.uv = input.uv;
+    return output;
+}

imgui/StandaloneImGuiTestbed/Shaders/Metal/imgui-frag.metal

@@ -0,0 +1,18 @@
+#include <metal_stdlib>
+using namespace metal;
+
+struct PS_INPUT
+{
+    float4 pos [[ position ]];
+    float4 col;
+    float2 uv;
+};
+
+fragment float4 FS(
+    PS_INPUT input [[ stage_in ]],
+    texture2d<float> FontTexture [[ texture(0) ]],
+    sampler FontSampler [[ sampler(0) ]])
+{
+    float4 out_col = input.col * FontTexture.sample(FontSampler, input.uv);
+    return out_col;
+}

imgui/StandaloneImGuiTestbed/Shaders/Metal/imgui-vertex.metal

@@ -0,0 +1,27 @@
+#include <metal_stdlib>
+using namespace metal;
+
+struct VS_INPUT
+{
+    float2 pos [[ attribute(0) ]];
+    float2 uv [[ attribute(1) ]];
+    float4 col [[ attribute(2) ]];
+};
+
+struct PS_INPUT
+{
+    float4 pos [[ position ]];
+    float4 col;
+    float2 uv;
+};
+
+vertex PS_INPUT VS(
+    VS_INPUT input [[ stage_in ]],
+    constant float4x4 &ProjectionMatrix [[ buffer(1) ]])
+{
+    PS_INPUT output;
+    output.pos = ProjectionMatrix * float4(input.pos.xy, 0.f, 1.f);
+    output.col = input.col;
+    output.uv = input.uv;
+    return output;
+}

imgui/StandaloneImGuiTestbed/Shaders/SPIR-V/generate-spirv.bat

@@ -0,0 +1,2 @@
+glslangvalidator -V imgui-vertex.glsl -o imgui-vertex.spv -S vert
+glslangvalidator -V imgui-frag.glsl -o imgui-frag.spv -S frag

imgui/StandaloneImGuiTestbed/Shaders/SPIR-V/imgui-frag.glsl

@@ -0,0 +1,16 @@
+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout(set = 1, binding = 0) uniform texture2D FontTexture;
+layout(set = 0, binding = 1) uniform sampler FontSampler;
+
+layout (location = 0) in vec4 color;
+layout (location = 1) in vec2 texCoord;
+layout (location = 0) out vec4 outputColor;
+
+void main()
+{
+    outputColor = color * texture(sampler2D(FontTexture, FontSampler), texCoord);
+}

imgui/StandaloneImGuiTestbed/Shaders/SPIR-V/imgui-vertex.glsl

@@ -0,0 +1,28 @@
+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) in vec2 in_position;
+layout (location = 1) in vec2 in_texCoord;
+layout (location = 2) in vec4 in_color;
+
+layout (binding = 0) uniform ProjectionMatrixBuffer
+{
+    mat4 projection_matrix;
+};
+
+layout (location = 0) out vec4 color;
+layout (location = 1) out vec2 texCoord;
+
+out gl_PerVertex
+{
+    vec4 gl_Position;
+};
+
+void main() 
+{
+    gl_Position = projection_matrix * vec4(in_position, 0, 1);
+    color = in_color;
+    texCoord = in_texCoord;
+}