limit_queries.hpp

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#pragma once
#ifndef OGLPLUS_CONTEXT_LIMIT_QUERIES_1201040722_HPP
#define OGLPLUS_CONTEXT_LIMIT_QUERIES_1201040722_HPP

#include <oglplus/glfunc.hpp>
#include <oglplus/limit_query.hpp>

namespace oglplus {
namespace context {


class LimitQueries
{
public:

    static GLint IntLimit(LimitQuery query)
    {
        GLint result = 0;
        OGLPLUS_GLFUNC(GetIntegerv)(GLenum(query), &result);
        OGLPLUS_VERIFY_SIMPLE(GetIntegerv);
        return result;
    }


    static GLint IntLimit(LimitQuery query, GLuint index)
    {
        GLint result = 0;
        OGLPLUS_GLFUNC(GetIntegeri_v)(GLenum(query), index, &result);
        OGLPLUS_VERIFY_SIMPLE(GetIntegeri_v);
        return result;
    }


    static GLfloat FloatLimit(LimitQuery query)
    {
        GLfloat result = 0;
        OGLPLUS_GLFUNC(GetFloatv)(GLenum(query), &result);
        OGLPLUS_VERIFY_SIMPLE(GetFloatv);
        return result;
    }

#if OGLPLUS_DOCUMENTATION_ONLY || GL_VERSION_4_1 || GL_ARB_viewport_array

    static GLfloat FloatLimit(LimitQuery query, GLuint index)
    {
        GLfloat result = 0;
        OGLPLUS_GLFUNC(GetFloati_v)(GLenum(query), index, &result);
        OGLPLUS_VERIFY_SIMPLE(GetFloati_v);
        return result;
    }
#endif

    static void ThrowIfOverLimit(
        LimitQuery limit,
        GLint value,
        GLint max_limit
    )
    {
        OGLPLUS_HANDLE_ERROR_IF(
            value > max_limit,
            GL_INVALID_VALUE,
            LimitError::Message(),
            LimitError,
            GLFunc(EnumValueName(limit).c_str())
        );
    }


    static void RequireAtLeast(LimitQuery limit, GLint value)
    {
        ThrowIfOverLimit(limit, value, IntLimit(limit));
    }


    static void RequireAtLeast(LimitQuery limit, GLuint index, GLint value)
    {
        ThrowIfOverLimit(limit, value, IntLimit(limit, index));
    }
};

} // namespace context
} // namespace oglplus

#endif // include guard