Question

我正在尝试在片段Shader中初始化usampler2D

    uniform vec3 lightColor;

uniform usampler2D texSampler;///////////

uniform vec3 ambientLight;
uniform vec3 lightPosition;
uniform vec3 cameraPosition;


in Vertex{
    vec4 rawPosition;
    vec2 uv;
    vec4 normal;
}vertexIn;

in InstanceData{
    unsigned int textureUnitIndex;
}instance;
out vec4 color;

void main(){

    vec3 normal = normalize(vec3(vertexIn.normal.x, vertexIn.normal.y, vertexIn.normal.z));
    vec3 worldPosition = vec3(vertexIn.rawPosition.x, vertexIn.rawPosition.y, vertexIn.rawPosition.z);

    vec3 lightVector = normalize(lightPosition - worldPosition);
    vec3 cameraVector = normalize(cameraPosition - worldPosition);
    vec3 halfVec = normalize(lightVector + cameraVector);

    float lightAngle = clamp(dot(lightVector, normal), 0.0f, 1.0f);
    float specAngle = clamp(dot(halfVec, normal), 0.0f, PI);
    float specular = clamp(pow(specAngle, 128), 0.0f, 1.0f);
    unsigned int index = instance.textureUnitIndex;

    vec4 actColor = texture2D(texSampler, vec2(vertexIn.uv)); //////////////////////
    vec4 diffuseLight = sqrt(actColor * vec4(lightColor, 1.0)) * lightAngle;
    vec4 specularLight = 1.0f - (cos(vec4(lightColor, 1.0f) * specular));

    color = actColor * (vec4(ambientLight, 1.0) + diffuseLight) + specularLight;// + vec4(ambientLight, 1.0f);
    }

喜欢这个

void ShaderProgram::addUniform(std::string uniformName, unsigned int uniformValue)
{
    unsigned int loc = glGetUniformLocation(_programID, uniformName.c_str());
    Graphic::checkOpenGLErrors("addUniform() - 1");
    glUniform1ui(loc, (GLuint)uniformValue);
    Graphic::checkOpenGLErrors("addUniform - 2");
}

loc结果为6且uniformValue等于2，但checkOpenGLErrors（）仍然抛出

"OpenGL ERROR: GL_INVALID_OPERATION - At: addUniform - 2"

有关初始化采样器制服需要了解的内容吗？因为此函数通常不会在此GLSL程序中抛出错误

由于

Answer 1

上传opaque types（包括采样器）的制服时，您必须使用glUniform1i或1iv。仅仅因为采样器使用无符号整数格式并不意味着统一调用更改匹配。

OpenGL glUniform1ui（）抛出GLError GL_INVALID_OPERATION

1 个答案: