Vulkan渲染器纹理坐标插值异常问题求助

我在测试自研Vulkan渲染器时，绘制了一个全屏四边形用于纹理采样，输入装配阶段的顶点输入如图所示。但将纹理坐标渲染到屏幕后，发现插值异常——起始值约为0.5，结束值约为0.8。以下是我的着色器代码及glslc.exe编译后的版本：

顶点着色器 #

#version 450

layout(location = 0) in vec2 positions;
layout(location = 1) in vec3 colors;
layout(location = 2) in vec2 texCoords;

layout(location = 0) out vec4 color;
layout(location = 1) out vec2 texCoord;

layout(push_constant) uniform PushConstants {
    vec2 projection;
} pushConstants;


void main() 
{
    if(colors.r == 0.0 && colors.g == 0.0 && colors.b == 0.0) 
        color = vec4(colors, 0.0);
    else
        color = vec4(colors, 1.0);

    texCoord = texCoords;
    gl_Position = vec4(positions * pushConstants.projection, 0.0, 1.0);
}

片段着色器 #

#version 450

layout(location = 0) out vec4 FragColor;
layout(location = 0) in vec4 color;
layout(location = 1) in vec2 texCoord;

layout(input_attachment_index = 0, binding = 0) uniform subpassInput offScreenInput;
layout(binding = 1) uniform sampler2D textureSampler;

void main() 
{
    //FragColor = subpassLoad(offScreenInput) * (1.0 - color.a) + texture(textureSampler, texCoord).r * color;
    FragColor = vec4(texCoord.x, texCoord.y, 0.0, 1.0);
}

glslc.exe编译后版本 #

#version 460

layout(push_constant, std430) uniform PushConstants
{
    vec2 projection;
} pushConstants;

layout(location = 1) in vec3 colors;
layout(location = 0) out vec4 color;
layout(location = 1) out vec2 texCoord;
layout(location = 2) in vec2 texCoords;
layout(location = 0) in vec2 positions;

void main()
{
    bool _17 = colors.x == 0.0;
    bool _24;
    if (_17)
    {
        _24 = colors.y == 0.0;
    }
    else
    {
        _24 = _17;
    }
    bool _31;
    if (_24)
    {
        _31 = colors.z == 0.0;
    }
    else
    {
        _31 = _24;
    }
    if (_31)
    {
        color = vec4(colors, 0.0);
    }
    else
    {
        color = vec4(colors, 1.0);
    }
    texCoord = texCoords;
    gl_Position = vec4(positions * pushConstants.projection, 0.0, 1.0);
}

#version 460

layout(input_attachment_index = 0, set = 0, binding = 0) uniform subpassInput offScreenInput;
layout(set = 0, binding = 1) uniform sampler2D textureSampler;

layout(location = 0) out vec4 FragColor;
layout(location = 1) in vec2 texCoord;
layout(location = 0) in vec4 color;

void main()
{
    FragColor = vec4(texCoord.x, texCoord.y, 0.0, 1.0);
}

内容的提问来源于stack exchange，提问作者yigitEmre